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# Seismological Society of America

Advancing earthquake science worldwide

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## Posts

- [News](https://www.seismosoc.org/news/)
- [At Work: Greg McLaskey](https://www.seismosoc.org/news/at-work-greg-mclaskey/) - 19 June 2023--Interested in math and science early on, and looking for a job that would benefit society, Greg McLaskey went to college to study civil engineering. “The thing that excited me the most about civil engineering was non-destructive testing,” he recalled, so he was soon learning all about wave propagation and signal analysis for
- [Leak During Norwegian Hydropower Tunnel Construction May Have Triggered Earthquake Swarm](https://www.seismosoc.org/news/leak-during-norwegian-hydropower-tunnel-construction-may-have-triggered-earthquake-swarm/) - 23 February 2026—Water leakage during the construction of a hydropower tunnel in northern Norway may have been the trigger for a nearby earthquake swarm that occurred three years later, according to a new analysis published in The Seismic Record. The swarm at Sørfjorden began in June 2023 and continued in bursts of seismic activity for
- [At Work: Max Schneider](https://www.seismosoc.org/news/at-work-max-schneider/) - 17 February 2026—Throughout his school years, Max Schneider was interested in math and science. But he also liked writing for local and campus newspapers. Then again, he enjoyed leading community service projects, cleaning up the beaches and volunteering in soup kitchens. And there was also his love of the performing and visual arts, starting all
- [Take Your Research Further with an SSA Grant](https://www.seismosoc.org/govt-relations-news/take-your-research-further-with-an-ssa-grant/) - 5 February 2026— Three SSA grant programs and the Government Relations Fellowship will accept applications in February, offering members the financial support they need to expand their professional networks, share their research and help advance the field of seismology worldwide. The Society’s Global Travel Grant program helps early-career and student members participate in scientific conferences
- [2018 Kīlauea Earthquake May Have Stalled Fault’s Slow Slip for Decades](https://www.seismosoc.org/news/2018-kilauea-earthquake-may-have-stalled-faults-slow-slip-for-decades/) - 5 February 2026—The magnitude 6.9 earthquake that took place in 2018 on the south flank of Kīlauea on the Island of Hawaiʻi may have stalled episodes of periodic slow slip along a major fault underlying the volcano, according to a new study by scientists at the U.S. Geological Survey. Since the rupture, slow slip events
- [Study Highlights Stressed Faults in Potential Shale Gas Region in South Africa](https://www.seismosoc.org/news/study-highlights-stressed-faults-in-potential-shale-gas-region-in-south-africa/) - 3 February 2026—A swarm of small earthquakes within the Karoo Basin in South Africa has revealed a critically stressed fault that could be perturbed by potential shale gas exploration in the area, according to a new report in Seismological Research Letters. The analysis by Benjamin Whitehead of the University of Cape Town and colleagues concludes
- [Eduardo Miranda Awarded the 2026 Bruce Bolt Medal](https://www.seismosoc.org/news/eduardo-miranda-awarded-the-2026-bruce-bolt-medal/) - 2 February 2026—The Earthquake Engineering Research Institute (EERI), the Consortium of Organizations for Strong Motion Observation Systems (COSMOS) and SSA are pleased to announce that Eduardo Miranda of Stanford University is the recipient of the 2026 Bruce Bolt Medal. Miranda was recognized for his contributions in developing new ground motion models and intensity measures, refining
- [New Analysis Disputes Historic Earthquake, Tsunami and Death Toll on Greek Island](https://www.seismosoc.org/news/new-analysis-disputes-historic-earthquake-tsunami-and-death-toll-on-greek-island/) - 22 January 2026—For decades, researchers thought that an October 1843 earthquake on the small Greek island of Chalke caused a powerful tsunami and led to the deaths of as many as 600 people. But a new analysis of primary accounts of the event by Ioanna Triantafyllou at Hellenic Mediterranean University suggests the truth was much
- [2026 SSA Election Results](https://www.seismosoc.org/news/2026-ssa-election-results/) - 14 January 2026—SSA announced the results from the 9 January 2026 election, conducted by YesElections!, a third-party independent firm. Four new members will join the board for three-year terms: Aybige Akinci, National Institute of Geophysics and Volcanology in Italy (INGV) Esteban Chavez, Volcanological and Seismological Observatory of Costa Rica (OVSICORI) at Universidad Nacional, Costa Rica
- [2026 SSA Honors Recipients Announced](https://www.seismosoc.org/news/2026-ssa-honors-recipients-announced/) - 12 January 2026—SSA is pleased to announce the recipients of several of the Society’s awards for 2026. The Harry Fielding Reid Medal, the Charles F. Richter Early Career Award, the Frank Press Public Service Award and the SSA Distinguished Service Award are among the highest honors conferred by the Society. 2026 Harry Fielding Reid Medal:
- [SSA Announces Candidates for 2026 Election to Board of Directors](https://www.seismosoc.org/news/election-2026/) - How can SSA best serve your professional needs and continue making advances in the field of seismology? Keep that question in mind as you read the candidate statements below for our 2026 Board of Directors Election. Then be sure to cast your vote! As the governing body for SSA, the Board of Directors helps set the
- [At Work: Umar Afegbua Kadiri](https://www.seismosoc.org/news/at-work-umar-afegbua-kadiri/) - 15 January 2026— As an undergraduate, Umar Afegbua Kadiri already saw the Earth sciences as a “platform” for tackling complex, interdisciplinary questions about our planet. But his interest in seismology came after he completed his master’s degree, when Nigeria began experiencing a series of intraplate earthquakes. “At that time, seismology was unfamiliar in Nigeria, and
- [SSA Updates Position Statements on Hazards Monitoring and Education and Workforce](https://www.seismosoc.org/news/ssa-updates-position-statements-on-hazards-monitoring-and-education-and-workforce/) - 7 January 2026—SSA has updated its position statements on Monitoring Earthquakes, Tsunamis and Other Hazards and Education and Workforce Development. Hazards Monitoring: SSA strongly recommends that the U.S. Congress continue to support and improve observing and hazard monitoring networks including the Advanced National Seismic System (ANSS), the Global Seismographic Network (GNS) and the Network of
- [Generous Gifts Lead to More SSA Grants in 2026](https://www.seismosoc.org/news/generous-gifts-lead-to-more-ssa-grants-in-2026/) - 5 January 2026—The Society stands ready to award nearly 50 percent more grants to members this year than it distributed to deserving recipients in 2025. This significant expansion has been made possible by the record-breaking gift from the estate of Clarence Allen, the Society’s 41st president. When Allen’s $1.6 million donation arrived at SSA headquarters
- [2026 Annual Meeting Travel Grants Announced](https://www.seismosoc.org/news/annual-meeting-travel-grants-help-more-members-join-the-scientific-conversation/) - 19 December 2025—A record number of SSA members received travel grants to attend the 2026 Annual Meeting, including the first to receive a new Society grant for U.S.-based regular members. These grants were made possible through generous contributions to the General Fund, Annual Meeting Travel Fund and Kanamori Fund. Student Recipients: Bartu Bilgen, Middle East
- [2025: A Year of Support](https://www.seismosoc.org/news/2025-a-year-of-support/) - 26 November 2025— Throughout the past year, SSA members stepped forward to mentor and teach one another. They raised their voices to advocate for federal support of our science and made generous financial gifts to aid our mission. Together we advanced seismology through: $88,600+ in grants supporting our community’s scientific efforts since January, including three
- [Don’t Miss SSA’s Expert-led Training Sessions](https://www.seismosoc.org/news/career-trainings/) - Register today to grow your career at all levels! 8 December 2025—SSA’s many member benefits include access to complimentary training sessions led by experts who understand our science as well as our ever-changing industry. Take advantage of more than 25 hours of free professional development offerings in early 2026—register today! On 9 December, Sarah Pietraszek-Mattner will
- [At Work: Thanh-Son Phạm](https://www.seismosoc.org/news/at-work-thanh-son-pham/) - 4 December 2025—Thanh-Son Phạm calls himself a “method developer.” As a seismologist, this means that his interests are to develop ways to reach from the Earth’s inner core to the ice sheets of Antarctica. Phạm, a research fellow at the Australian National University, discovered the geosciences after studying mathematics and physics, which may help explain
- [Study Searches for Landslide Clues in Seismic Signals from Alaska’s Barry Arm](https://www.seismosoc.org/news/study-searches-for-landslide-clues-in-seismic-signals-from-alaskas-barry-arm/) - 2 December 2025—Since 2020, the Barry Landslide in Alaska’s Prince William Sound has been outfitted with instruments monitoring seismic signals from the area, as researchers hope to catch a destructive, tsunami-generating landslide before it starts. A team of scientists studying those signals have identified an unusual class of seismic events, characterized by impulsive, high-frequency signals
- [Francisco José Sánchez-Sesma Selected as 2026 Joyner Lecturer](https://www.seismosoc.org/news/francisco-jose-sanchez-sesma-selected-as-2026-joyner-lecturer/) - 1 December 2025—SSA and the Earthquake Engineering Research Institute (EERI) are pleased to announce that Francisco José Sánchez-Sesma, professor at the Universidad Autónoma de Mexico (UNAM), is the 2026 recipient of the William B. Joyner Lecture Award. Sánchez-Sesma will deliver the Joyner Lecture at the 2026 SSA Annual Meeting to be held 14-18 April 2026
- [Tsunami from Massive Kamchatka Earthquake Captured by Satellite](https://www.seismosoc.org/news/tsunami-from-massive-kamchatka-earthquake-captured-by-satellite/) - 26 November 2025—A satellite deployed to measure ocean surface heights was up to the challenge when a massive earthquake off the Kamchatka Peninsula triggered a Pacific-wide tsunami in late July. The Surface Water Ocean Topography or SWOT satellite captured the first high-resolution spaceborne track of a great subduction zone tsunami, researchers report in The Seismic
- [Seismic Sensors Used to Identify Types of Aircraft Flying Over Alaska](https://www.seismosoc.org/news/seismic-sensors-used-to-identify-types-of-aircraft-flying-over-alaska/) - 18 November 2025—An array of seismic sensors deployed to capture aftershocks from the 2018 magnitude 7.1 Anchorage earthquake also collected distinctive signals from hundreds of flights crossing over Alaska. In their study published in The Seismic Record, Isabella Seppi and colleagues at the University of Alaska Fairbanks show that these signals can be used to
- [SRL Welcomes First Deputy Editor-in-Chief](https://www.seismosoc.org/news/srl-welcomes-first-deputy-editor-in-chief/) - 18 November 2025—SRL Editor-in-Chief Allison Bent has appointed Hongfeng Yang as the first deputy editor-in-chief of its journal Seismological Research Letters (SRL). Yang, a professor in the department of Earth and environmental sciences at The Chinese University of Hong Kong, joined the editorial board of SRL as an associate editor in 2018. He will begin
- [At Work: Bill Curry](https://www.seismosoc.org/news/at-work-bill-curry/) - 4 November 2025—Bill Curry grew up in Alberta, Canada, in what he calls “the home of the Canadian energy industry,” so the idea of exploring a career in the earth sciences came early to him. “My favorite subjects were math and physics, which drew me to geophysics,” Curry explained. “In the 1990s, geophysics in Alberta
- [Paul Andrew Spudich Fund Supports Scientific Travel to Japan](https://www.seismosoc.org/news/paul-andrew-spudich-fund-supports-scientific-travel-to-japan/) - An SSA student and early-career member attended a seismology-advancing conference in Kochi, Japan—an experience made possible by donor generosity. 1 November 2025— Baoning Wu never met the late seismologist who inspired SSA’s newest support program, but he knows his research well. One of Paul Spudich’s widely-cited papers is referenced throughout Wu’s PhD project on earthquake
- [Liquefaction Triggering Model for Induced Earthquakes Validated With 2016 Pawnee Event](https://www.seismosoc.org/news/liquefaction-triggering-model-for-induced-earthquakes-validated-with-2016-pawnee-event/) - 23 October 2025—The 2016 magnitude 5.8 Pawnee earthquake in Oklahoma, caused by wastewater injection, is the first induced seismic event documented to cause liquefaction. Sand boils and surface cracks were observed at sites affected by the event’s strong ground shaking. Geotechnical earthquake engineers have models to predict where and how severe these kinds of liquefaction
- [Seismologists Are at the Heart of the Next 30 Years of Nuclear Monitoring](https://www.seismosoc.org/news/seismologists-are-at-the-heart-of-the-next-30-years-of-nuclear-monitoring/) - 8 October 2025—2025 has been a year of anniversaries for the nuclear monitoring community, some grim and some hopeful. It was 80 years ago that the first nuclear bombs devastated Hiroshima and Nagasaki. But it was nearly 30 years ago, in 1996, that the Comprehensive Test Ban Treaty opened to signature. Before 1996, there were
- [At Work: Louisa Barama](https://www.seismosoc.org/news/at-work-louisa-barama/) - 16 September 2025—For her dissertation, Louisa Barama worked on ways to characterize seismic events like tsunamigenic and deep earthquakes in near real time, using teleseismic data, calculations of radiated earthquake energy and machine learning techniques. “Then I got this opportunity to work on an Air Force Research Lab project [led by Zhigang Peng], asking if
- [SSA Seeks New BSSA Editor-in-Chief](https://www.seismosoc.org/news/ssa-seeks-new-bssa-editor-in-chief-2/) - 15 August 2025—The Seismological Society of America announces its search for the next Editor-in-Chief (EIC) of the Bulletin of the Seismological Society of America (BSSA), its flagship, peer-reviewed international journal. Nominations for the position, including self-nominations, will be accepted through October 2025. The EIC leadership transition is scheduled to take place during the late spring
- [Taiwan Study Analyzes Attributes of Resilience After Major Earthquakes](https://www.seismosoc.org/news/taiwan-study-analyzes-attributes-of-resilience-after-major-earthquakes/) - 5 September 2025—Resilience is a term often discussed in the face of a natural disaster such as a major earthquake, but the attributes of resilience and how they interact are rarely analyzed, researchers say in a new study published in the Bulletin of the Seismological Society of America. To learn more about resilience, Hsiang-Chieh Lee
- [The International Conference on Intraplate and Himalayan Seismology](https://www.seismosoc.org/news/abstracts-open-for-international-conference-on-intraplate-and-himalayan-seismology/) - 8 July 2025—The International Conference on Intraplate and Himalayan Seismology (AES 2026) in Gandhinagar, India is a three-day technical conference organized by the Indian Society of Earthquake Science (ISES) and the Institute of Seismological Research, and sponsored in part by SSA. Now Accepting Abstracts and Travel Grant Applications. The 22-25 January 2026 meeting will bring together seismologists, geophysicists and
- [Mysterious Fickle Hill Earthquake in Northern California May Have Unexpected Source](https://www.seismosoc.org/news/mysterious-fickle-hill-earthquake-in-northern-california-may-have-unexpected-source/) - 19 August 2025—What lies beneath Fickle Hill in northern California? Maybe the answer to an earthquake mystery that has puzzled seismologists for decades. The origin of the 1954 magnitude 6.5 earthquake that rattled residents around Humboldt Bay has been unclear, but a new study now suggests a surprising source: the Cascadia subduction interface. In the
- [At Work: Robert Anthony](https://www.seismosoc.org/news/at-work-robert-anthony/) - 18 August 2025—There’s a lot of things that Rob Anthony likes about New Mexico. But as a geophysicist interested in noise, there’s one aspect that stands out: the relative seismic quietness. “We’re one of the quietest spots in the United States,” Anthony says of his workplace at the Albuquerque Seismological Laboratory. “And that’s mainly because
- [Study Demonstrates Excellent Potential of Earthquake Early Warning System in Alaska](https://www.seismosoc.org/news/study-demonstrates-excellent-potential-of-earthquake-early-warning-system-in-alaska/) - 5 August 2025—For a wide variety of earthquake scenarios in Alaska, an earthquake early warning (EEW) system could provide at least 10 seconds of warning time for hazardous shaking, according to a new report. Increasing the density and improving the spacing of seismic stations around the state could add 5 to 15 seconds to these
- [Free to Read Papers Related to Kamchatka Earthquake](https://www.seismosoc.org/news/free-to-read-papers-related-to-kamchatka-earthquake/) - 30 July 2025—As a service to global researchers working on the 29 July 2025 magnitude 8.8 earthquake east of Petropavlovsk-Kamchatsky, Russia, the Seismological Society of America has created a short list of our journal papers related to the region. These papers will be freely available until 22 August 2025. BSSA Slip Distribution of the 1952
- [Can Seismic Signals Detect Fragmentation of a Fireball Meteoroid?](https://www.seismosoc.org/news/can-seismic-signals-detect-fragmentation-of-a-fireball-meteoroid/) - 23 July 2025—The seismic signature of a fireball meteoroid event can be used to tell whether the fireball fragmented or remained intact as it fell through the atmosphere, according to new research published in Seismological Research Letters. The 2020 return of the sample capsule from the asteroid-exploring Hayabusa2 mission to southern Australia offered a unique
- [First Analyses of Myanmar Earthquake Conclude Fault Ruptured at Supershear Velocity](https://www.seismosoc.org/news/first-analyses-of-myanmar-earthquake-conclude-fault-ruptured-at-supershear-velocity/) - 11 July 2025—The first studies of the 28 March 2025 magnitude 7.8 Myanmar earthquake suggest that the southern portion of its rupture occurred at supershear velocity, reaching speeds of 5 to 6 kilometers per second. In their paper published in The Seismic Record, seismologists Lingling Ye, Thorne Lay and Hiroo Kanamori share new details about
- [Curved Fault Slip Captured on CCTV During Myanmar Earthquake](https://www.seismosoc.org/news/curved-fault-slip-captured-on-cctv-during-myanmar-earthquake/) - 18 July 2025—Dramatic CCTV video of fault slip during a recent large earthquake in Myanmar thrilled both scientists and casual observers when it was posted to YouTube. But it was on his fifth or sixth viewing, said geophysicist Jesse Kearse, that he spotted something even more exciting. When Kearse and his colleague Yoshihiro Kaneko at
- [Global Seismology: Taking the Pulse of the Planet](https://www.seismosoc.org/news/global-seismology-taking-the-pulse-of-the-planet/) - 9 July 2025—The Global Seismographic Network has stations in Ulaanbaatar, Mongolia and Waverly, Tennessee. Its instruments gather ground motion data in the deserts of western China, at the South Pole and in Germany’s Black Forest. And at every moment, these data are broadcast to researchers, monitoring agencies and the public around the world. “So we
- [Environmental Seismology: Q&A With Keynote Speaker Fabian Walter](https://www.seismosoc.org/news/environmental-seismology-qa-with-keynote-speaker-fabian-walter/) - 9 July 2025—Fabian Walter, a senior scientist at the Swiss Federal Institute for Forest, Snow and Landscape Research WSL, is a member of the program committee for the upcoming SSA Environmental Seismology meeting. The October conference “has a balance of a strong group of high-level researchers and the right size where you actually have a chance to
- [SSA: A Voice for Seismology](https://www.seismosoc.org/news/ssa-a-voice-for-seismology/) - 25 June 2025—The Society continues to maintain a close connection with U.S. policymakers on Capitol Hill, stressing the important role of seismological research in addressing national challenges and encouraging federal support of science-driven policies. The Society’s latest advocacy efforts for our science include these calls for the reauthorization and full funding of the National Volcano
- [Impact Factors Rise for BSSA, SRL](https://www.seismosoc.org/news/impact-factors-rise-for-bssa-srl/) - 19 June 2025— The peer-reviewed journals of the Seismological Society of America remain at the forefront of seismological research thanks to our authors, members, editorial boards, reviewers and readers. SSA is pleased to announce this year’s impact factors according to the Clarivate Analytics 2025 Journal Citation Reports (JCR). The 2025 Impact Factor is calculated based
- [The Seismic Record Now Included in Web of Science™](https://www.seismosoc.org/news/the-seismic-record-now-included-in-web-of-science/) - 19 June 2025—The Seismological Society of America (SSA)’s journal The Seismic Record is now included in Clarivate’s Web of Science™ (WoS) in its Emerging Sources Citation Index (ESCI). The journal was included in WoS after meeting a set of 28 criteria that measure editorial rigor and publication best practices, and citation activity as a measure
- [Opening Doors: SSA’s Grant Programs](https://www.seismosoc.org/news/environmental-seismology-travel-grantees-announced-2/) - 16 June 2025— Earlier this year, PhD student Yitang Cai presented their research at the General Assembly of the European Geosciences Union in Vienna, Austria (EGU25). Their SSA Global Travel Grant “meant a lot,” they said because it enabled them to participate in the conference and forge new connections with other researchers in the global
- [Environmental Seismology: Q&A With Keynote Speaker Roland Bürgmann](https://www.seismosoc.org/news/environmental-seismology-qa-with-keynote-speaker-roland-burgmann/) - 16 June 2025— Roland Bürgmann, professor at the University of California, Berkeley Department of Earth and Planetary Science and the Berkeley Seismological Laboratory and head of the Active Tectonics group at UC Berkeley, will deliver the opening keynote at SSA's Environmental Seismology meeting. SSA spoke with him to hear more about his plans for the
- [At Work: Hannah Mark](https://www.seismosoc.org/news/at-work-hannah-mark/) - 16 June 2025—If plate tectonics are canon in the Earth sciences, the details of what makes up a “plate” are surprisingly tricky, says Hannah Mark. “The definition of a plate is a section of the outermost solid layer of the Earth that behaves as a rigid body, and deforms only at its boundaries,” she explains.
- [Join the SSA 2026 Co-chairs in Pasadena!](https://www.seismosoc.org/news/join-the-ssa-2026-co-chairs-in-pasadena/) - 11 June 2025—The SSA Annual Meeting returns to its California roots next year as we celebrate the 120th anniversary of the Society. The 14-18 April 2026 conference in Pasadena offers a chance for the global seismology community to come together for what many past attendees have called the most essential professional meeting on their yearly
- [SSA Seeks New BSSA Editor-in-Chief](https://www.seismosoc.org/news/ssa-seeks-new-bssa-editor-in-chief/) - 7 July 2020 – Today the Seismological Society of America announced its search for the next Editor-in-Chief (EIC) of Bulletin of the Seismological Society of America (BSSA), its flagship, peer-reviewed international journal. The journal is key to the Society meeting its core mission to advance earthquake science worldwide and to support the assembly and distribution
- [2025 Annual Meeting Student Presentation Awards Announced](https://www.seismosoc.org/news/2025-annual-meeting-student-presentation-awards-announced/) - 16 May 2025—In an ongoing effort to support and promote the outstanding work of SSA student members, the Society is pleased to present 12 students with a 2025 Student Presentation Award. The SSA awards program seeks to highlight excellent student presentations (poster or oral) at the SSA Annual Meeting. Each of the recipients listed below 6 June 2024 – SSA announced today the recipients of the 2024 Student Presentation Award, which honors excellent poster or oral presentations at the Annual Meeting, held in Anchorage, Alaska in April. Nominated by meeting attendees, a three-person judging panel selected the 19 award recipients among the eligible pool of student presenters.
- [At Work: Carol Prentice](https://www.seismosoc.org/news/at-work-carol-prentice/) - 9 October 2017--USGS research geologist Carol Prentice’s career path has been globe-trotting, taking her to field sites in Northern California, the Caribbean and Mongolia, among other places. “I really love the San Andreas fault, but I guess I don’t have a favorite place to work,” Prentice says. Prentice splits her time between fieldwork, data analysis
- [At Work: Mike Stickney](https://www.seismosoc.org/news/work-mike-stickney/) - 17 November 2017--A magnitude 5.8 earthquake in western Montana and a swarm of more than 400 small earthquakes around Yellowstone National Park kept Mike Stickney busy this summer. As the director of the Earthquake Studies Office at the Montana Bureau of Mines and Geology, Stickney is the one-person seismology shop that the state relies upon
- [At Work: Xyoli Pérez-Campos](https://www.seismosoc.org/news/work-xyoli-perez-campos/) - 27 December 2017--Xyoli Pérez-Campos was 11 years old when the magnitude 8.0 Michoacán earthquake struck the Mexico City region on 19 September 1985, collapsing buildings near her home. Her uncle survived the total collapse of the 13-story Nuevo León apartment building, in an area of the city devastated by the quake. “All of this triggered
- [SSA Announces Election Results](https://www.seismosoc.org/news/ssa-announces-election-results/) - 9 January 2018— The Seismological Society of America held its election on 5 January 2018. Election America, Inc., tabulated and validated the votes of current members that were received by the deadline, 12 noon PST on 5 January. The following nominees for Director were elected to a three-year term beginning in May 2018, at the
- [At Work: Kevin Milner](https://www.seismosoc.org/news/work-kevin-milner/) - 26 January 2018--Kevin Milner was studying computer programming and 3D animation at the University of Southern California as an undergraduate when he took a sophomore-year internship with the Southern California Earthquake Center (SCEC). SCEC was looking for help with 3D visualization software, “but I didn’t really know anything about earthquakes,” he recalled. “I grew up
- [At Work: Ellen Rathje](https://www.seismosoc.org/news/at-work-ellen-rathje/) - 13 March 2018--The way that soil and rock behave during and after an earthquake are studied not just by earth scientists, but by the engineers who must build against the next earthquake. It’s an aspect of seismology that isn’t always recognized by the public, says University of Texas at Austin Professor Ellen Rathje. Rathje is
- [At Work: Natalia Ruppert](https://www.seismosoc.org/news/at-work-natalia-ruppert/) - 11 April 2018--In 1994, Natalia Ruppert arrived at the University of Alaska Fairbanks to start graduate school, uncertain whether she would stay for more than one semester. Now, Ruppert has been studying earthquakes in her adopted state and country for almost 25 years, with no plans to leave Fairbanks in the near future. “I was
- [At Work: Allison Bent](https://www.seismosoc.org/news/at-work-allison-bent/) - 11 May 2018--How big is an earthquake? Seismologists have been measuring this feature—the magnitude of an earthquake—for more than a century, but the answers are not always as straightforward as one would think, says Allison Bent, a research seismologist with Natural Resources Canada. Numbers associated with the Richter scale and the moment magnitude scale (Mw)
- [At Work: Annemarie Baltay](https://www.seismosoc.org/news/at-work-annemarie-baltay/) - 21 June 2018--U.S. Geological Survey Research Geophysicist Annemarie Baltay recognized the importance of mathematics and the natural world at an early age. To keep her entertained in the car, her father would write math problems in a notebook for her to figure out. She also had a collection of rocks and minerals. Years later, Baltay
- [At Work: Adam Pascale](https://www.seismosoc.org/news/at-work-adam-pascale/) - Say the word “seismograph,” and many minds go directly to the image of a machine scribbling out ink lines to trace the shaking of an earthquake. Seismology has always been a profession especially known for its tools, even though the field has moved far from the stylus and drum recorder. Adam Pascale, chief technology officer
- [At Work: 2019 Annual Meeting Co-Chairs Joan Gomberg and Michael Bostock](https://www.seismosoc.org/news/at-work-2019-annual-meeting-co-chairs-joan-gomberg-and-michael-bostock/) - Seattle is the site of SSA’s 2019 Annual Meeting. It’s also one of the major cities along the Cascadia Subduction Zone, the volatile seismic region that stretches from Northern California to Vancouver Island. Formed by the Juan de Fuca, Gorda and Explorer plates dipping below the denser North American plate, the Cascadia Subduction Zone is
- [At Work: Stefano Parolai](https://www.seismosoc.org/news/at-work-stefano-parolai/) - Traditional earthquake early warning systems detect the fast-moving, but less-powerful P-waves that radiate from an earthquake. From there, they quickly estimate the earthquake’s location and magnitude and send out an alert, often just seconds before the more powerful S- waves arrive. But what does that alert mean for the building you’re currently in? It’s a
- [At Work: Peter Shearer](https://www.seismosoc.org/news/at-work-peter-shearer/) - 5 September 2018--SSA President Peter Shearer has deep ties to the Society he now heads. He published his first professional paper in the Bulletin of the Seismological Society of America, and he gave his first professional talk at the 1981 SSA Annual Meeting in Berkeley. “I was incredibly nervous,” he recalls, “but it was a
- [At Work: Hiroshi Kawase](https://www.seismosoc.org/news/at-work-hiroshi-kawase/) - 1 October 2018--Before becoming a professor within the Sophisticated Earthquake Risk Evaluation Program – part of Kyoto University’s Disaster Prevention Research Institute – Hiroshi Kawase seemed destined to become an architect or structural engineer. He grew up watching his father design and build houses at the same time Japan was making major investments in infrastructure.
- [At Work: Amanda Price](https://www.seismosoc.org/news/at-work-amanda-price/) - Seismology has always been a part of Amanda Price’s life – even if she didn’t always know it would be her job. “I grew up in southern and central California around earthquakes,” she says. “They’ve always fascinated me.” After taking time off after high school, she returned to college and her interest in earthquakes became
- [At Work: Phoebe DeVries](https://www.seismosoc.org/news/at-work-phoebe-devries/) - Gaining insight into where earthquake aftershocks might occur is a long-standing challenge in earthquake science, especially as some aftershocks can approach the size of the mainshock earthquake and can damage buildings and roads already weakened by the main earthquake. Phoebe Robinson DeVries and her coauthors are pursuing one way to strengthen aftershock location forecasts—using a
- [2019 SSA Board of Directors Election Results](https://www.seismosoc.org/news/2019-ssa-board-of-directors-election-results/) - The Seismological Society of America held its Board of Directors election on Friday, 4 January 2019. The following nominees for Director were elected to a three-year term beginning in April 2019 at the SSA Annual Meeting in Seattle: Heather DeShon, Associate Professor, Southern Methodist University Heather DeShon's principal fields of research are earthquake location, seismic
- [At Work: Rémy Bossu](https://www.seismosoc.org/news/at-work-remy-bossu/) - On 30 November 2018, users of the LastQuake app received notifications on their phones and computers—an M7.0 earthquake had just struck Alaska. Upon clicking the notification, they were taken to a page with maps, data and comments from those who felt the quake. Within seconds, they knew exactly where and how strong it was. Within
- [At Work: Vedran Lekic](https://www.seismosoc.org/news/at-work-vedran-lekic/) - When an earthquake occurs, seismic waves travel throughout the Earth. As they encounter material of different rigidity, however, they slow down or change direction. By mapping out where this happens, scientists can create images of the structures and processes within the deep Earth – a technique known as global tomography. The problem? Earthquakes do not
- [At Work: Kasey Aderhold](https://www.seismosoc.org/news/at-work-kasey-aderhold/) - Despite growing up in Homer, Alaska, perched above the ruptured fault of the 1964 M9.2 earthquake, Kasey Aderhold didn’t initially consider a career in the geosciences. “I focused on the many other coastal fascinations that Homer provided, such as whales and estuarine ecology,” she says. But after moving to Indiana to attend DePauw University, where
- [At Work: Susan Hough](https://www.seismosoc.org/news/at-work-susan-hough/) - 13 June 2019--If you don’t know who Bailey Willis and Robert T. Hill are, Susan Hough has got a book for you. It’s her own book, actually—one that she’s working on now, about the period between 1906 and 1933, when earthquake hazard for the Los Angeles area was being debated by Willis and Hill against
- [At Work: Joan Latchman](https://www.seismosoc.org/news/at-work-joan-latchman/) - 15 July 2019 --Joan Latchman, a seismologist at The University of the West Indies Seismic Research Centre, was born in Trinidad and Tobago and grew up just a 15-minute walk from the Centre – then known as the Seismic Research Unit. At the time, the Centre had a low profile, but when she joined the
- [At Work: Adam Ringler](https://www.seismosoc.org/news/at-work-adam-ringler/) - 15 August 2019--Seismic networks depend on good instrumentation. But testing sensitive seismic instruments to make sure they’re working right can be a challenge, as Adam Ringler, a physical scientist with the U.S. Geological Survey, knows well. “Seismometers aren’t only sensitive to ground motion, which you want, they’re also sensitive to things you don’t want, like
- [2020 SSA Board of Directors Election](https://www.seismosoc.org/news/2020-ssa-board-of-directors-election/) - SSA announces the 2020 election to select four new members to serve three-year terms on the Board of Directors. The seven candidates and their statements are presented below, in alphabetical order by last name; in order by last name, these candidates are Annemarie Baltay, Susan Bilek, Matthew Gerstenberger, Hiroshi Kawase, Diego Melgar, Zhigang Peng and
- [At Work: Leah Salditch](https://www.seismosoc.org/news/at-work-leah-salditch/) - 16 September 2019--Earthquake faults have short memories—or at least, that’s what the traditional earthquake cycle model suggests. Based on the elastic rebound theory proposed by Harry Fielding Reid after the 1906 San Francisco earthquake, the traditional model assumes that each earthquake in an area occurs independently of one another, and that the average time between
- [North American Seismic Networks Can Contribute to Nuclear Security](https://www.seismosoc.org/news/north-american-seismic-networks-can-contribute-to-nuclear-security/) - 2 October 2019--The International Monitoring System is the top global seismic network for monitoring nuclear weapon tests around the world. To expand the system’s detection capabilities, however, international monitors should seek out the data, methods and expertise of smaller regional seismic networks. In a paper published as part of an upcoming focus section on regional
- [At Work: Max Suter](https://www.seismosoc.org/news/at-work-max-suter/) - 23 October 2019--Although he grew up in Switzerland and received his Ph.D. at the University of Basel, much of Max Suter’s career has been centered on Mexico. From the Trans-Mexican Volcanic Belt in central Mexico to the Basin and Range province of northwestern Mexico, his research has identified and characterized historical earthquakes throughout the country—with
- [At Work: Jessica Velasquez](https://www.seismosoc.org/news/at-work-jessica-velasquez/) - 20 November 2019--The terms may seem interchangeable to a layperson, but “hazard” and “risk” mean very different things in earthquake science. A seismic hazard is a natural phenomenon such as the level of ground shaking caused by an earthquake. Seismic risk, on the other hand, refers to the probability that people will incur loss or
- [At Work: Alan Kafka](https://www.seismosoc.org/news/at-work-alan-kafka/) - 18 December 2019--Alan Kafka’s career as a seismologist began with a Ph.D. studying earthquakes associated with the Caribbean plate, but “I ended up focusing on the Northeast U.S. (NEUS) for a not-very-exotic reason,” he explains. “I feel at home in the NEUS, and I didn’t want to leave.” “What I had not expected was the
- [At Work: Marlon Ramos](https://www.seismosoc.org/news/at-work-marlon-ramos/) - 14 February 2020--As he pursued his master’s degree at Boise State University, Marlon Ramos was doing what he calls “traditional, active-source seismology,” interpreting seismic pictures of tsunami-producing faults near the Kodiak Island segment of the Alaska-Aleutian megathrust zone. “I had an interest in subduction zones and the very large earthquakes that occur there,” he says.
- [At Work: Carl Tape](https://www.seismosoc.org/news/at-work-carl-tape/) - 16 March 2020--There are two main pillars of seismology, Carl Tape says. “One is studying the structure of the earth or any medium—it could be a rock sample in the laboratory, he notes. “The other is studying source processes—an earthquake, a volcanic event, an event within a glacier, a nuclear explosion. With all these things,
- [At Work: Hrvoje Tkalčić](https://www.seismosoc.org/news/at-work-hrvoje-tkalcic/) - 15 April 2020--Exploring planets other than the Earth was Hrvoje Tkalčić’s first love, he says. “Ever since I can remember I wanted to become an astronaut.” Tkalčić, now the head of seismology and mathematical geophysics at The Australian National University, was fascinated by the universe and adept in mathematics and computer sciences from an early
- [At Work: Janis Hernandez](https://www.seismosoc.org/news/at-work-janis-hernandez/) - 15 May 2020--When Janis Hernandez was studying for her associate degree, she took an introduction to geology class to meet a science requirement. “After that, I kept thinking, ‘what’s wrong with me, why am I thinking so much about rocks?’” she says. “It was just so interesting. And once you study geology and you’re a
- [At Work: Bill Walter](https://www.seismosoc.org/news/at-work-bill-walter/) - 16 June 2020--In 1988, as a graduate student, SSA President Bill Walter and his colleagues arrived in Kazakhstan to record a Soviet nuclear test as part of the U.S.-USSR Joint Verification Experiment (JVE). The partnership was an unusual one in the context of the Cold War: U.S. and Soviet scientists worked together to compare on-site
- [At Work: Amanda Lough](https://www.seismosoc.org/news/at-work-amanda-lough/) - 13 July 2020--Deep long period (DLP) earthquakes occur close to the base of the crust and contain seismic waveforms with frequencies less than 5 Hz—a phenomenon very different from the high frequency, relatively shallow tectonic activity that most people think of as an earthquake. DLP earthquakes are most often associated with volcanoes, especially with the
- [At Work: Lucia Gualtieri](https://www.seismosoc.org/news/at-work-lucia-gualtieri/) - 17 August 2020--For decades, seismologists have contended with the background “hiss” of the Earth—seismic waves generated by the normal interaction of land, ocean and atmosphere. Their goal has been to find ways to subtract this “noise,” to concentrate on the seismicity generated by earthquakes. But one scientist’s noise is another’s signal, according to Lucia Gualtieri.
- [At Work: Brian Terbush](https://www.seismosoc.org/news/at-work-brian-terbush/) - 14 September 2020--In 2004, Brian Terbush climbed Mt. St. Helens in Washington State. The trip fueled his fascination with volcanoes, and he “jumped on the chance” to go to graduate school to study them further. “I’ve been lucky to get to see lots of volcanoes erupting and get a little closer to them than is
- [At Work: D. Sarah Stamps](https://www.seismosoc.org/news/at-work-d-sarah-stamps/) - 15 October 2020--The shape of the Earth may seem stable, but Virginia Tech geophysicist D. Sarah Stamps knows differently. She and her colleagues track its shifting shape millimeter by millimeter, quantifying the horizontal and vertical motions of the tectonic plates to get at the physics behind the plate motions. The tools of geodesy-- the study
- [At Work: Esteban Chaves](https://www.seismosoc.org/news/at-work-esteban-chaves/) - 16 November 2020--Costa Rica is home to about 15,000 earthquakes a year, and its citizens are well-educated when it comes to the science behind all the seismic activity, says Esteban Chaves. “If you ask a Costa Rican where the subduction zone is, they are able to respond. Most of them can tell you if an
- [At Work: Takahiko Uchide](https://www.seismosoc.org/news/at-work-takahiko-uchide/) - 16 December 2020--Big earthquakes may grab the headlines, but for Takahiko Uchide, the small events are just as interesting. For one thing, studying small earthquakes is a good way to learn about the physical properties of underground faults at a fine scale, he says. “Earthquakes reflect factors including the applied stress and frictional properties of
- [At Work: Jonathan Ajo-Franklin](https://www.seismosoc.org/news/at-work-jonathan-ajo-franklin/) - 15 January 2021--In applied geophysics, studying the movements of the Earth goes far beyond the seismic signatures of natural earthquakes. During his career, Jonathan Ajo-Franklin has worked on permafrost, CO2 storage, geothermal energy, aquifer systems and more. “My interests always lie in the intersection between what people do to the Earth and the seismic and
- [At Work: Ben Mason](https://www.seismosoc.org/member/at-work-ben-mason/) - 16 February 2021--Ben Mason has been a member of four post-earthquake reconnaissance teams, dispatched to places like Nepal after a magnitude 7.8 earthquake in 2015 and Japan after the 2011 magnitude 9.0 Tohoku earthquake and tsunami to gather information on how these major events occurred and what steps can be taken to mitigate the impact
- [At Work: Rengin Gök](https://www.seismosoc.org/news/at-work-rengin-gok/) - 15 March 2021--Rengin Gök’s work day starts early, with text messages and email from all around the Middle East, Central Asia, Southeast Asia and the Caucasus regions. Even before the pandemic, she kept odd office hours, responding to her colleagues in these regions late into the night and on weekends. “I have collaborators, but for
- [At Work: Paula Koelemeijer](https://www.seismosoc.org/news/at-work-paula-koelemeijer/) - 15 April 2021--The list of Paula Koelemeijer’s study subjects would be enough to pique anyone’s interest: continent-sized blobs in the Earth’s lower mantle, mountains on its core, and … elephants. More about the elephants later. Koelemeijer, a Royal Society University Research Fellow at Royal Holloway University of London, is a global seismologist who uses seismic
- [Peggy Hellweg Elected SSA President-Elect](https://www.seismosoc.org/news/peggy-hellweg-elected-ssa-president-elect/) - 23 April 2021--Peggy Hellweg, operations manager for the Berkeley Seismological Laboratory (BSL) at the University of California, Berkeley, was elected president-elect by the Board of the Seismological Society of America on 14 April. Hellweg previously served as SSA Secretary and co-chaired the 100th Anniversary Earthquake Conference, SSA’s joint meeting with the Earthquake Engineering Research Institute
- [At Work: Emily Kleber](https://www.seismosoc.org/news/at-work-emily-kleber/) - 17 May 2021--Some days you can’t see the forest for the trees—and some days, you don’t want to see either one. For earthquake geologists like Emily Kleber, getting at the ground beneath all the distractions is the goal for learning more about natural hazards. Kleber, a project geologist with the Geologic Hazards Program at the
- [At Work: Kristine Pankow](https://www.seismosoc.org/news/at-work-kristine-pankow/) - 17 June 2021--Kristine Pankow’s Ph.D. research involved subduction zones—specifically, modeling shear wave structure of a subducting slab off the eastern coast of Russia. But when she began looking for jobs after receiving the degree, an offer from the University of Utah Seismograph Stations turned her sights further inland. “This was right before the [2002] Olympics
- [At Work: Amir Salaree](https://www.seismosoc.org/news/at-work-amir-salaree/) - 15 July 2021--For Amir Salaree, the road to studying tsunamis began when he was a physics major at the University of Tehran, “looking for simple, real-world applications of all the beautiful math and physics that I was learning which would be useful to people,” he recalled. Visiting a friend in the geophysics department, he learned
- [At Work: Louisa Brotherson](https://www.seismosoc.org/news/at-work-louisa-brotherson/) - 16 August 2021--Earthquakes are happening all the time inside Louisa Brotherson’s lab. Tiny ones, at least—and the strike-slip faults involved occur in Perspex plastic, not rock. Using a machine called a triaxial deformation apparatus, Brotherson can apply different pressures and stresses on the plastic to mimic the conditions that lead to earthquakes in the real
- [SSA Announces Candidates for Election to Board of Directors](https://www.seismosoc.org/uncategorized/ssa-announces-candidates-for-election-to-board-of-directors-2/) - [The election has now closed.] Why Vote? SSA Board of Directors 2022 Election How can SSA best serve its members and meet its mission? I encourage you to ask yourself these questions as you prepare to participate in the 2022 Board of Directors Election. This is your opportunity to select the individuals who will steer
- [SSA Receives $1.6 Million: Largest Gift in Society History](https://www.seismosoc.org/news/ssa-receives-1-6-million-largest-gift-in-society-history/) - The generosity of Clarence Allen (1925-2021), SSA’s 41st president, will bring career-changing opportunities to countless scientists in our community. The Seismological Society of America (SSA) announced today that it has received a gift of nearly $1.6 million, a bequest from the estate of renowned seismologist Clarence Allen. The gift from the Caltech professor emeritus of
- [At Work: Songqiao “Shawn” Wei](https://www.seismosoc.org/news/at-work-songqiao-shawn-wei/) - 20 September 2021--Growing up in the mountains in China, Songqiao “Shawn” Wei never saw the ocean until he was 23, flying over the Pacific from Beijing to San Francisco for an American Geophysical Union meeting. “But when I was a kid I liked the sea, from books and movies, and so I wanted to study
- [At Work: Gilead Wurman](https://www.seismosoc.org/news/at-work-gilead-wurman/) - 3 November 2021--Seismic hazard analyses may use ergodic ground motion models—a sort of “average” based on global data about ground motion—or non-ergodic models, which incorporate more local and regional data on seismic source and nearby geologic structures. Having that site-specific analysis can make a big difference, as consulting seismologist Gilead Wurman found out on his
- [At Work: James Kaklamanos](https://www.seismosoc.org/news/at-work-james-kaklamanos/) - 15 December 2021--The plan was to become a lawyer, says James Kaklamanos, recalling his early years as an undergraduate. But an interest in math and science, and encouraging science mentors at Tufts University, soon had him wondering if law school was really in his future. The Sumatra earthquake and tsunami in 2004 and Hurricane Katrina
- [At Work: Alicia Hotovec-Ellis](https://www.seismosoc.org/news/at-work-alicia-hotovec-ellis/) - 18 January 2022--For as long as Alicia Hotovec-Ellis can remember, she’s had “three core pieces of identity,” she said. “I like to draw, my favorite color is fire, and I want to be a scientist when I grow up.” She spent hours during her college days writing and illustrating a 400-page graphic novel that was
- [At Work: Delaine Reiter](https://www.seismosoc.org/news/at-work-delaine-reiter/) - 14 February 2022--At the Colorado School of Mines, where Delaine Reiter was an undergraduate, she found her interests in math and Earth physics turned toward exploration seismology and near-surface studies. “I was looking at big reflection surveys of the very shallow crust, trying to find oil and gas plays,” she explained. But after a Ph.D.
- [At Work: Mouse Marie Reusch](https://www.seismosoc.org/news/at-work-mouse-marie-reusch/) - 14 March 2022--As the Regional ShakeAlert Coordinator for the Pacific Northwest Seismic Network, Mouse Marie Reusch often fields questions about earthquake early warning from the public. “For earthquake early warning, a big misconception is that it’s prediction, and it’s not,” Reusch explained. “An earthquake has already started somewhere, and we’re sharing the information that you
- [At Work: John Townend](https://www.seismosoc.org/news/at-work-john-townend/) - 15 April 2022--As SSA President, John Townend has been at the helm of the society as it weathered the challenges of a pandemic and a virtual annual meeting, but the past year has led to new insights as well. “The pandemic has forced us to adapt the ways we meet and share our science, and
- [SSA Board of Directors Election 2019](https://www.seismosoc.org/news/2019-ssa-election/) - SSA announces the candidates for the 2019 election to add four members to the Board of Directors. The nominating committee, chaired by Jim Mori, confirmed a slate of six individuals to run for office. The committee included: Jim Mori (Kyoto University) Rachel Abercrombie (Boston University) Gail Atkinson (Western University) Ken Hudnut (U.S. Geological Survey) Zhigang
- [SSA Supports NEHRP Reauthorization](https://www.seismosoc.org/govt-relations-news/ssa-supports-nehrp-reauthorization/) - Through the work of our Government Relations Committee, SSA is supporting the Congressional reauthorization of the National Earthquake Hazards Reduction Program (NEHRP). NEHRP is the federal government’s coordinated long-term nationwide program to reduce risks to life and property resulting from earthquakes, and to facilitate social, economic and industrial recovery after a major earthquake. On September
- [SSA, AGU Reaffirm Position Statement on the Comprehensive Nuclear-Test Ban Treaty](https://www.seismosoc.org/news/ssa-agu-reaffirm-position-statement-comprehensive-nuclear-test-ban-treaty/) - 29 June 2017--The American Geophysical Union (AGU) and Seismological Society of America (SSA) today announced a revision of their position statement, "The Capability to Monitor the Comprehensive Nuclear-Test-Ban Treaty (CTBT) Should be Expanded, Completed, and Sustained."
- [At Work: Peggy Hellweg](https://www.seismosoc.org/news/at-work-peggy-hellweg/) - 16 May 2022--Peggy Hellweg was the first Explainer hired at the Exploratorium, a science, technology and arts museum in San Francisco, when it opened in 1969. The job as a young docent, engaging visitors and leading demonstrations, was a perfect fit for Hellweg. She had grown up in a family of physicists, “where there was
- [At Work: Manuel Matthew Mendoza](https://www.seismosoc.org/news/at-work-manuel-matthew-mendoza/) - 29 June 2022--The scenes of devastation from the 2011 Tohoku earthquake and tsunami were part of what made Manuel Mendoza consider a career as a geophysicist, he says. The combination of interesting science, travel and the ability to help people were all factors that convinced him to study earthquakes. Mendoza’s path to that decision was
- [At Work: Zoya Farajpour](https://www.seismosoc.org/news/at-work-zoya-farajpour/) - 29 July 2022--Zoya Farajpour was born in Iran, one of the most seismically active countries in the world. Most of Iran’s major cities and towns are in the vicinity of seismic faults, she said. “The oral and written history of this country is full of massive and destructive earthquake events that have killed thousands of
- [At Work: Andrea Bryant](https://www.seismosoc.org/news/at-work-andrea-bryant/) - 31 August 2022--Andrea Bryant came to her work with NASA’s Dragonfly mission through what she calls “a beautiful accident.” Quarantining by herself in a tiny studio apartment in 2020, the University of Chicago graduate student was looking for a NASA internship that might fit with her exoplanet studies. A posting for a Dragonfly internship caught
- [At Work: Xiaohua (Eric) Xu](https://www.seismosoc.org/news/at-work-xiaohua-eric-xu/) - 30 September 2022--“Geodesy is quite an old research field that started pretty much when humans wanted to measure the Earth, but it is also very new, especially since the rise of space-borne radar techniques,” said Xiaohua (Eric) Xu. “Space geodesy has helped scientists to measure not just the shape, but the change of the Earth’s
- [At Work: Fan-Chi Lin](https://www.seismosoc.org/news/at-work-fan-chi-lin/) - 28 October 2022--Fan-Chi Lin likes to travel. Some of his favorite destinations are the U.S. national parks, “and I’ve always been curious about how seismology can help us to learn more about the geological features we observe there,” he said. Now, one of his largest research projects involves one of the most famous national parks
- [At Work: Joses Omojola](https://www.seismosoc.org/news/at-work-joses-omojola/) - 30 November 2022--So far, the career of Joses Omojola has moved from water to oil to salt. His first interest, in hydrogeology, came about in high school after he watched his first water borehole being drilled. “A geologist came over to me, explaining about the different sediments they were bringing out, and explaining to me
- [At Work: Rebecca O. Salvage](https://www.seismosoc.org/news/at-work-rebecca-o-salvage/) - 6 January 2023--Rebecca Salvage’s high school in the U.K. didn’t offer Earth sciences as a course, but she loved physical geography and chemistry. One of her teachers suggested that Salvage consider a geology degree at university. “When I got there, I knew this was what I wanted to do,” recalls Salvage, now a research associate
- [At Work: Paul Friberg](https://www.seismosoc.org/news/at-work-paul-friberg/) - 3 February 2023--Twenty-five years ago this month, Paul Friberg and his partner Sidney Hellman started their own company. At the time, they were working on seismology software for IRIS-PASSCAL at its Instrument Center at Lamont Doherty Earth Observatory, when IRIS announced a move to consolidate its instrument centers in New Mexico. Instead of moving west,
- [At Work: Kevin Ward](https://www.seismosoc.org/news/at-work-kevin-ward/) - 6 March 2023--As a non-traditional student, Kevin Ward went back to school “not even clear that I was going back for anything in the geosciences,” he said. “I kind of stumbled upon it when I was taking general ed classes.” “I was always good at math and physics, but then I also liked the outdoors
- [At Work: Wasja Bloch](https://www.seismosoc.org/news/at-work-wasja-bloch/) - 14 April 2023--As he studied subduction zone seismicity, Wasja Bloch noticed that water was sometimes used as a wild card when it came to explaining what lays below these complex tectonic plate margins. “If people do interpretations of subsurface images and something’s odd, they sometimes pull the ‘fluid joker,’” Bloch said. “That was a little
- [At Work: Simona Gabrielli](https://www.seismosoc.org/news/at-work-simona-gabrielli/) - 22 May 2023--Simona Gabrielli studies seismic attenuation, or what happens when a seismic wave interacts with its surrounding medium. She compares it to how a stone dropped into a pond sends ripples through the water, and the ripples change direction depending on what they meet as they move across the pond. In the case of
- [At Work: Ruth Harris](https://www.seismosoc.org/news/at-work-ruth-harris/) - 19 July 2023--Like all scientific disciplines, seismology is not immune to trends. And right now, creeping faults are having a bit of a moment, according to Ruth Harris. The topic is a long-time research interest of Harris, a Senior Scientist with the U.S. Geological Survey’s Earthquake Science Center and president of SSA. She describes creeping
- [At Work: Carene Larmat](https://www.seismosoc.org/news/at-work-carene-larmat/) - 18 August 2023--It sounds like science fiction, but one of Carene Larmat’s tasks as a geoscientist at Los Alamos National Laboratory is time reversal. “During my Ph.D. it became possible to perform time reversal of the seismic waves created by an earthquake, using a supercomputer and the full waveform solver SPECFEM3D that was then in
- [SSA Launches The Paul Andrew Spudich Fund](https://www.seismosoc.org/news/ssa-launches-the-paul-andrew-spudich-fund-to-support-scientific-travel/) - 18 September 2023--A new fund at SSA honors the life and accomplishments of Paul Andrew Spudich (1950-2019) by supporting the professional development of Society members at the beginning of their careers in seismology. Through The Paul Andrew Spudich Fund, SSA will establish the Paul Andrew Spudich Travel Grant program, which will begin by issuing one
- [At Work: Natalie Balfour](https://www.seismosoc.org/news/at-work-natalie-balfour/) - 20 September 2023--Throughout her career, Natalie Balfour has moved back and forth between research, management and leadership roles. “It is a bit of who I am,” said Balfour, now the head of research at Toka Tū Ake EQC, Aotearoa New Zealand’s Earthquake Commission. “I love learning about natural hazards, about people, about leadership, and I
- [At Work: Gabrielle Tepp](https://www.seismosoc.org/news/at-work-gabrielle-tepp/) - 23 October 2023--Gabrielle Tepp grew up in Michigan—far from the earthquakes and volcanoes she would later study. She also “grew up in a small city where ‘scientist’ wasn’t really a career path,” she recalls, but she was good at math and curious about how things worked. She thought she might like to become a veterinarian,
- [Q&A with TSR Editor-in-Chief Keith Koper](https://www.seismosoc.org/journals/qa-with-tsr-editor-in-chief-keith-koper/) - 4 December 2023--As The Seismic Record nears its three-year anniversary, we asked Editor-in-Chief Keith Koper to talk about how the journal has evolved and what to expect next in its pages. SSA: The Seismic Record will celebrate its three-year anniversary in 2024. Why do you think the journal has been successful so far? KK: SSA
- [Seismic and Infrasonic Signals used to Characterize Nord Stream Pipeline Events](https://www.seismosoc.org/news/seismic-and-infrasonic-signals-used-to-characterize-nord-stream-pipeline-events/) - 3 January 2024--Seismic events that coincided with sudden drops in pressure within the Nord Stream 1 and 2 natural gas pipelines in September 2022 alerted the world to the rupture of pipelines in the western Baltic Sea. The suspected act of sabotage, which reportedly used explosive charges to rupture the pipelines, is still under investigation
- [At Work: Adrian Rodriguez-Marek](https://www.seismosoc.org/news/at-work-adrian-rodriguez-marek/) - 8 January 2024--The characterization of uncertainty has been a theme of Adrian Rodriguez-Marek’s career as an earthquake engineer. “That was something that I was interested in from the very first time that I got into hazard analysis,” he explained. “When it comes to ground motion prediction, as a layperson you think that the more we
- [SSA Supports NEHRP Reauthorization Bill](https://www.seismosoc.org/news/ssa-supports-nehrp-reauthorization-bill/) - 18 January 2024—Through the work of our Government Relations Committee, SSA is supporting the Congressional reauthorization of the National Earthquake Hazards Reduction Program (NEHRP), through bipartisan legislation introduced today by U.S. Senators Alex Padilla (D-Calif.) and Lisa Murkowski (R-Alaska). NEHRP is the federal government’s coordinated long-term nationwide program to reduce risks to life and property
- [At Work: HyeJeong Kim](https://www.seismosoc.org/news/at-work-hyejeong-kim/) - 13 February 2024--Oceans cover about 70% of the Earth’s surface—a fact that draws HyeJeong Kim’s scientific gaze under the sea, even as the seismologist now works on dry land as a postdoc at the University of Utah. “If you don’t have seismic stations under that massive water, it’s limiting our understanding for 70% of the
- [Earthquake Fatality Measure Offers New Way to Estimate Impact on Countries](https://www.seismosoc.org/news/earthquake-fatality-measure-offers-new-way-to-estimate-impact-on-countries/) - 15 February 2024--A new measure that compares earthquake-related fatalities to a country’s population size concludes that Ecuador, Lebanon, Haiti, Turkmenistan, Iran and Portugal have experienced the greatest impact from fatalities in the past five centuries. The new impact measure, introduced in the Bulletin of the Seismological Society of America by Max Wyss and colleagues at
- [Strange Seismic Wave Arrivals Lead to Discovery of Overturned Slab in the Mediterranean](https://www.seismosoc.org/news/strange-seismic-wave-arrivals-lead-to-discovery-of-overturned-slab-in-the-mediterranean/) - 21 February 2024--Strange seismic wave arrivals from a 2010 earthquake under Spain were the clues that led to an unexpected discovery beneath the western Mediterranean: a subducted oceanic slab that has completely overturned. The waveforms paint a picture of a slab that descended rapidly into the Earth’s mantle and flipped over, so that the water
- [Could Fiber Optic Cable Help Scientists Probe the Deep Layers of the Moon?](https://www.seismosoc.org/news/could-fiber-optic-cable-help-scientists-probe-the-deep-layers-of-the-moon/) - 28 February 2024--An increasing number of seismologists are using fiber optic cables to detect seismic waves on Earth—but how would this technology fare on the Moon, and what would it tell us about the deep layers of our nearest neighbor in space? In Seismological Research Letters, Wenbo Wu of Woods Hole Oceanographic Institute and colleagues
- [At Work: Luis Donoso Carmona](https://www.seismosoc.org/news/at-work-luis-donoso-carmona/) - 12 March 2024--Earthquakes were part of Luis Donoso Carmona’s environment “for as long as I can remember,” growing up in northern Chile in the small city of Vallenar in the Atacama Desert, he said. His great-grandmother told stories of the destroyed ports and railway lines and overturned locomotives she had seen after the Great Atacama
- [What Kinds of Seismic Signals Did Swifties Send at LA Concert?](https://www.seismosoc.org/news/what-kinds-of-seismic-signals-did-swifties-send-at-la-concert/) - 13 March 2024--Seattle may have experienced its own Swift Quake last July, but at an August 2023 concert Taylor Swift’s fans in Los Angeles gave scientists a lot of shaking to ponder. After some debate, a research team led by Gabrielle Tepp of Caltech concluded that it was likely the dancing and jumping motions of
- [At Work: Tina Dura](https://www.seismosoc.org/news/at-work-tina-dura/) - 16 April 2024--Tina Dura has always been interested in the natural world—from volcanoes to weather to “learning more about why the landscape looked the way it did,” she recalled. But the fieldwork she does as a paleoseismologist would not have appealed to her as a child. “It’s funny to me that I was afraid of
- [What Are the Ethics of Sharing Earthquake Aftershock Forecasts Globally?](https://www.seismosoc.org/news/what-are-the-ethics-of-sharing-earthquake-aftershock-forecasts-globally/) - 1 May 2024--When a magnitude 5+ earthquake occurs in the United States, the U.S. Geological Survey makes a variety of aftershock forecast communication products available to the public. But is there an ethical responsibility to make aftershock products more widely available to people affected by earthquakes in other countries? In listening sessions held in 2022
- [Trees Help to Date Catastrophic Landslide Related to 1906 San Francisco Earthquake](https://www.seismosoc.org/news/trees-help-to-date-catastrophic-landslide-related-to-1906-san-francisco-earthquake/) - 1 May 2024--Trees caught up in two prehistoric, devastating landslides in the Coast Ranges of northern California suggest that the landslides could be linked to major earthquakes, including the magnitude 7.9 1906 San Francisco earthquake, researchers said at the Seismological Society of America (SSA)’s 2024 Annual Meeting. In the Mule Slide landslide, telltale trauma in
- [High Temperature Signals Along Faults Used to Understand Past Earthquake Dynamics](https://www.seismosoc.org/news/high-temperature-signals-along-faults-used-to-understand-past-earthquake-dynamics/) - 1 May 2024--Friction along a fault during an earthquake can sometimes generate a rise in temperatures high enough to produce a signal in the organic and mineral material contained within the fault’s rocks. At the Seismological Society of America (SSA)’s 2024 Annual Meeting, Genevieve Coffey of GNS Science discussed how she and her colleagues are
- [Lahar Detection System Upgraded for Mount Rainier](https://www.seismosoc.org/news/lahar-detection-system-upgraded-for-mount-rainier/) - 2 May 2024--In the shadow of Washington State’s Mount Rainier, about 90,000 people live in the path of a potential large lahar—a destructive, fluid and fast-moving debris flow associated with volcanic slopes. At the Seismological Society of America (SSA)’s 2024 Annual Meeting, U.S. Geological Survey volcano seismologist Seth Moran described how he and his colleagues
- [Study Takes the Seismic and Acoustic Pulse of Wind Turbines](https://www.seismosoc.org/news/study-takes-the-seismic-and-acoustic-pulse-of-wind-turbines/) - 2 May 2024--As wind power becomes a widespread and cost-effective renewable energy source at sites throughout the world, researchers are focusing on the propagation of seismic and acoustic waves that wind-harnessing turbines produce. At the Seismological Society of America (SSA)’s 2024 Annual Meeting, researchers presented simulations of turbine-driven wave propagation across several frequencies and ground
- [Study Finds Possible Magma Reservoir Located Beneath Denali Volcanic Gap](https://www.seismosoc.org/news/study-finds-possible-magma-reservoir-located-beneath-denali-volcanic-gap/) - 2 May 2024--A recent study of the crust below south-central Alaska, across the Denali Fault, suggests there may be a reservoir of magma located below the enigmatic Denali Volcanic Gap, researchers reported at the Seismological Society of America (SSA)’s 2024 Annual Meeting. The Denali Volcanic Gap (DVG) is the roughly 400-kilometer-long gap in volcanic activity
- [Permafrost Mapping in Utqiaġvik, Alaska Shows Impacts of Infrastructure](https://www.seismosoc.org/news/permafrost-mapping-in-utqiagvik-alaska-shows-impacts-of-infrastructure/) - 2 May 2024--Permafrost in Utqiaġvik, Alaska, differs from place to place under the surface, ranging from ice rich zones to unfrozen layers in both undisturbed and disturbed tundra, according to a new report discussed at the Seismological Society of America (SSA)’s 2024 Annual Meeting. Using multiple geophysical techniques to explore this spatial variability, Ahmad Tourei
- [New Nevada Experiments Will Improve Monitoring of Nuclear Explosions](https://www.seismosoc.org/news/new-nevada-experiments-will-improve-monitoring-of-nuclear-explosions/) - 2 May 2024--On an October morning in 2023, a chemical explosion detonated in a tunnel under the Nevada desert was the launch of the next set of experiments by the National Nuclear Security Administration, with the goal to improve detection of low-yield nuclear explosions around the world. Physics Experiment 1-A (PE1-A) is the first in
- [Lake Tsunamis Pose Significant Threat Under Warming Climate](https://www.seismosoc.org/news/lake-tsunamis-pose-significant-threat-under-warming-climate/) - 2 May 2024--The names might not be familiar—Cowee Creek, Brabazon Range, Upper Pederson Lagoon—but they mark the sites of recent lake tsunamis, a phenomenon that is increasingly common in Alaska, British Columbia and other regions with mountain glaciers. Triggered by landslides into small bodies of water, most of these tsunamis have occurred in remote locations
- [Seismic Waves Used to Track LA’s Groundwater Recharge After Record Wet Winter](https://www.seismosoc.org/news/seismic-waves-used-to-track-las-groundwater-recharge-after-record-wet-winter/) - 3 May 2024--Record-setting storms in 2023 filled California’s major reservoirs to the brim, providing some relief in a decades-long drought, but how much of that record rain trickled underground? Shujuan Mao of Stanford University and her colleagues used a surprising technique to answer this question for the greater Los Angeles metropolitan area. They analyzed changes
- [Transient Earthquake Pulses Preceded Kahramanmaraş Earthquake in Türkiye](https://www.seismosoc.org/news/transient-earthquake-pulses-preceded-kahramanmaras-earthquake-in-turkiye/) - 3 May 2024--About six months before the 2023 Mw 7.8 Kahramanmaraş earthquake in Türkiye, transient short pulses of low-frequency seismic activity were occurring on the east side of the East Anatolian Fault Zone, researchers reported at SSA's 2024 Annual Meeting. Learning more about the properties and physical origins of these pulses could point toward a
- [Pore Pressure Diffusion Led to Microseismicity at Illinois Basin Carbon Sequestration Site](https://www.seismosoc.org/news/pore-pressure-diffusion-led-to-microseismicity-at-illinois-basin-carbon-sequestration-site/) - 8 May 2024--Pore pressure diffusion generated by carbon dioxide injected underground at a carbon storage site in the Illinois Basin is the likely cause of hundreds of microearthquakes that took place at the site between 2011 and 2012, according to a new analysis. The modeling study published in the Bulletin of the Seismological Society of
- [At Work: Miao Zhang](https://www.seismosoc.org/news/at-work-miao-zhang/) - 15 May 2024--When it comes to seismic sources, observational seismologist Miao Zhang doesn’t play favorites. “I am curious about all types of seismic events on land and at sea, ranging from tectonic and volcanic earthquakes to induced earthquakes and manmade explosions,” said Zhang, an assistant professor at Dalhousie University. “My students and I are actively
- [First Paul Andrew Spudich Travel Grantee Completes Scientific Journey](https://www.seismosoc.org/news/first-paul-andrew-spudich-travel-grantee-completes-scientific-journey/) - SSA’s newest grant program sends early-career member to Osaka, Japan Chunyang Ji, a postdoctoral scholar at North Carolina State University whose research focuses on the modeling and assessment of high-frequency ground motions, is the first SSA member to participate in a seismological meeting with the aid of a Paul Andrew Spudich Travel Grant. “It’s an
- [At Work: Tamarah King](https://www.seismosoc.org/news/at-work-tamarah-king/) - 18 June 2024--Tamarah King, is there a question you hear often about Australian seismicity? “If I had a dollar for every time somebody told me ‘Australia doesn’t have earthquakes!’” King said. “Not just from the general populace, I regularly meet earthquake scientists who are genuinely surprised to hear about Australia’s record of earthquakes.” “In relative
- [At Work: Arsène Sadiki](https://www.seismosoc.org/news/at-work-arsene-sadiki/) - 29 July 2024--In the spring of 2024, Arsène Sadiki traveled from Goma Volcano Observatory (GVO) to share his research on the seismic precursors to the May 2021 eruption of Nyiragongo volcano. This volcano in the Democratic Republic of Congo once played a significant role in Sadiki’s career choice, he recalled. “I remember in 2002, when
- [Gift Helps Paul Andrew Spudich Travel Grant Program Grow](https://www.seismosoc.org/news/gift-helps-paul-andrew-spudich-travel-grant-program-grow/) - 05 August 2024 –A $10,000 gift from Paul Andrew Spudich's sister, Suzanne, to the Paul Andrew Spudich Fund has expanded its travel grant offerings for early-career and student members. Providing the biggest boost to the fund since its 2023 launch, the new gift will help SSA reach its goal of $200,000 so that it may
- [Sichuan Province Earthquake Offers Lessons for Landslide Prediction from GNSS Observations](https://www.seismosoc.org/news/sichuan-province-earthquake-offers-lessons-for-landslide-prediction-from-gnss-observations/) - 7 August 2024--Using data collected from a 2022 magnitude 6.8 earthquake in Luding County in China’s Sichuan Province, researchers tested whether Global Navigation Satellite System (GNSS) observations could be used for rapid prediction of earthquake-triggered landslides. In their report in Seismological Research Letters, Kejie Chen of the Southern University of Science and Technology and colleagues
- [Greenland Megatsunami Led to Week-Long Oscillating Fjord Wave](https://www.seismosoc.org/news/greenland-megatsunami-led-to-week-long-oscillating-fjord-wave/) - 8 August 2024--In September 2023, a megatsunami in remote eastern Greenland sent seismic waves around the world, piquing the interest of the global research community. The event created a week-long oscillating wave in Dickson Fjord, according to a new report in The Seismic Record. Angela Carrillo-Ponce of GFZ German Research Centre for Geoscience and her
- [In-Building Data from Small to Moderate Earthquakes Can Help Predict Structural Response](https://www.seismosoc.org/news/in-building-data-from-small-to-moderate-earthquakes-can-help-predict-structural-response/) - 15 August 2024--Data recorded by seismic instrumentation in buildings where ground motion is weak to moderate can help engineers better understand structural responses to earthquakes, according to a new paper published in the Bulletin of the Seismological Society of America. Philippe Guéguen and Ariana Astorga at Université Grenoble Alpes – ISTerre analyzed data recorded over
- [Ocean Bottom Seismometers Solve Some Mysteries at the Yap Trench](https://www.seismosoc.org/news/ocean-bottom-seismometers-solve-some-mysteries-at-the-yap-trench/) - 29 August 2024--About 21 million years ago the Yap Trench collided with a thick piece of ocean crust called the Caroline Plateau. But is the Yap Trench still an active subduction zone? And why does the Yap Trench look a little different from its subduction zone neighbors in the western Pacific Ocean? Data gleaned from
- [At Work: Voon Hui Lai](https://www.seismosoc.org/news/at-work-voon-hui-lai/) - 4 September 2024--When Voon Hui Lai came to Australian National University as a postdoc, her department had just acquired a DAS interrogator “and I was basically tasked to make this thing work,” she recalled. “It was my first experience in deploying these really dense seismic sensors.” Distributed acoustic sensing or DAS uses the tiny internal
- [Precariously Balanced Rocks in New York, Vermont Provide Limits on Earthquake Shaking](https://www.seismosoc.org/news/precariously-balanced-rocks-in-new-york-vermont-provide-limits-on-earthquake-shaking/) - 10 September 2024--Five boulders, delivered by glacier and balancing delicately on rocky pedestals in northern New York and Vermont, can help define long-term maximum shaking intensity of earthquakes in the region. Seismologists examine the fragility of precariously balanced rocks, or PBRs, to determine the intensity of shaking would be needed to dislodge them from their
- [Are Branch Faults the “On-Ramps” that Lead to Great Continental Transform Earthquakes?](https://www.seismosoc.org/news/are-branch-faults-the-on-ramps-that-lead-to-great-continental-transform-earthquakes/) - 25 September 2024--The five largest continental transform earthquakes since 2000 all originated on a branch of the main fault—and two researchers predict that the next great earthquake of this type will also get its start on a branch or splay fault. Last year’s magnitude 7.8 Pazarcık earthquake in Türkiye was one of these large and
- [Closer Look at New Jersey Earthquake Rupture Could Explain Shaking Reports](https://www.seismosoc.org/news/closer-look-at-new-jersey-earthquake-rupture-could-explain-shaking-reports/) - 1 October 2024--The magnitude 4.8 Tewksbury earthquake surprised millions of people on the U.S. East Coast who felt the shaking from this largest instrumentally recorded earthquake in New Jersey since 1900. But researchers noted something else unusual about the earthquake: why did so many people 40 miles away in New York City report strong shaking,
- [At Work: Julian Lozos](https://www.seismosoc.org/news/at-work-julian-lozos/) - 4 October 2024--Julian Lozos describes his job—modestly—as “making fake earthquakes on his computer.” But the associate professor of geophysics at California State University, Northridge was also a fan of volcanoes from a young age. During his last visit at his parents’ home, “my mom found a book that I had made about volcanoes in 1991,
- [Plugged Wells and Reduced Injection Lower Induced Earthquake Rates in Oklahoma](https://www.seismosoc.org/news/plugged-wells-and-reduced-injection-lower-induced-earthquake-rates-in-oklahoma/) - 13 November 2024--Wastewater injection resulting from oil and gas production in Oklahoma caused a dramatic rise in seismic activity in the state between 2009 and 2015. But regulatory efforts to backfill some injection wells with cement and reduce injection volumes have been effective in lowering the state’s induced earthquake rate, according to a new study
- [Events of 1973 Chilean Coup Captured in Historical Seismograms](https://www.seismosoc.org/news/events-of-1973-chilean-coup-captured-in-historical-seismograms/) - 11 December 2024--Military vehicles rumbling toward the presidential palace, bombs dropped by the Chilean Air Force, and an eerie quiet descending over Santiago after a curfew imposed by a military junta—a lone seismometer captured all these features of the 1973 Chilean coup d’état. In Seismological Research Letters, Sergio León-Rios of Universidad de Chile and colleagues
- [Groundwater Depletion May Have Been Significant Trigger for 2023 Morocco Earthquake](https://www.seismosoc.org/news/groundwater-depletion-may-have-been-significant-trigger-for-2023-morocco-earthquake/) - 24 December 2024--The rapid, decade-long depletion of groundwater in Morocco’s Haouz plain may have affected the accumulation of tectonic stress that led to the deadly 8 September 2023 magnitude 6.8 Al Haouz earthquake, according to a new study published in the Bulletin of the Seismological Society of America. Bhaskar Kundu of NIT Rourkela and colleagues
- [At Work: Daniel Gittins](https://www.seismosoc.org/early-career/at-work-daniel-gittins/) - 9 January 2025—Earthquakes may be the noisy, attention-getters of seismological research, but geophysicist Daniel Gittins is focused on something a bit quieter. “Creep is the slow, gradual movement along faults that happens without causing an earthquake. Unlike sudden earthquakes, which release a lot of energy, aseismic creep occurs smoothly and quietly over time,” explains Gittins,
- [Could the Summerville Ghost Lantern Be an Earthquake Light?](https://www.seismosoc.org/news/could-the-summerville-ghost-lantern-be-an-earthquake-light/) - 22 January 2025—Gather around, and let Susan Hough tell you the tale of the Summerville Light. Legend has it that the strange orb sometimes seen hovering over the railroad tracks in the remote area around Summerville, South Carolina is a lantern borne by a ghost whose husband lost his head in a train accident. But
- [Claims for the World’s Deepest Earthquake Challenged by New Analysis](https://www.seismosoc.org/news/claims-for-the-worlds-deepest-earthquake-challenged-by-new-analysis/) - 22 January 2025—The magnitude 7.9 Bonin Islands earthquake sequence, which ruptured deep within the earth near the base of the upper mantle, did not include an aftershock that extended to record depths into the lower mantle, according to a study in The Seismic Record. When Hao Zhang of the University of Southern California and colleagues
- [At Work: Wilnelly Ventura-Valentín](https://www.seismosoc.org/news/at-work-wilnelly-ventura-valentin/) - 10 February 2025—Wilnelly Ventura-Valentín’s research as a Ph.D. student at Miami University in Ohio focuses on earthquake swarms, the bursts of seismic activity—small earthquakes all about the same magnitude—that start abruptly and end abruptly. “We don’t know a lot about what triggers this activity,” she explains, “and because we don’t know the driving force, it
- [Scientists Use Distant Sensor to Monitor American Samoa Earthquake Swarm](https://www.seismosoc.org/news/scientists-use-distant-sensor-to-monitor-american-samoa-earthquake-swarm/) - 14 February 2025 — In late July to October 2022, residents of the Manu’a Islands in American Samoa felt the earth shake several times a day, raising concerns of an imminent volcanic eruption or tsunami. An earthquake catalog for the area turned up nothing, because the islands lacked a seismic monitoring network that could measure
- [Seismic Study of Singapore Could Guide Urban Construction and Renewable Energy Development](https://www.seismosoc.org/news/seismic-study-of-singapore-could-guide-urban-construction-and-renewable-energy-development/) - 5 March 2025 — A new seismic study of Singapore could guide urban growth and renewable energy development in the coastal city nation, where 5.6 million residents live within an area of 734 square kilometers. The study, published in Seismological Research Letters, identifies areas with increased risk of ground shaking and a possible reservoir for geothermal
- [At Work: Boris Rösler](https://www.seismosoc.org/news/at-work-boris-rosler/) - 10 March 2025—“Moment tensors are a model to describe earthquake sources based on forces acting at the seismic source,” explains Boris Rösler. “In the 1960s, it was shown that these forces generate a seismic wavefield equivalent to slip on a fault. We can thus describe the geologic process of an earthquake source using moment tensors.”
- [Researchers Forecast Shaking Damage from Crustal Earthquake Scenarios in Mexico City](https://www.seismosoc.org/news/researchers-forecast-shaking-damage-from-crustal-earthquake-scenarios-in-mexico-city/) - 11 March 2025– A recent swarm of small shallow earthquakes in Mexico City in 2019 and 2023 caused surprisingly strong ground shaking, prompting researchers to wonder how shaking from a moderate sized earthquake might impact buildings across the city. In the Bulletin of the Seismological Society of America, Miguel Jaimes and Gerardo Suárez at Universidad Nacional
- [Nuclear Monitoring System Suggests Landslide Cut off Internet in West Africa](https://www.seismosoc.org/news/nuclear-monitoring-system-suggests-landslide-cut-off-internet-in-west-africa/) - 27 March 2025—Hydroacoustic signals captured by the world’s international nuclear monitoring system suggest an underwater landslide may have broken communications cables and disrupted internet traffic in west African countries for several weeks in March 2024. Researchers used data collected by hydrophones installed by the International Monitoring System of the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) to
- [Clustering of Upper Plate and Subduction Earthquakes at New Zealand’s Southern Hikurangi Margin](https://www.seismosoc.org/news/clustering-of-upper-plate-and-subduction-earthquakes-at-new-zealands-southern-hikurangi-margin/) - 1 April 2025—More than half of the earthquakes sampled at the subduction interface at the southern Hikurangi margin in Aotearoa-New Zealand cluster in time with earthquakes on three upper plate faults, according to a new analysis. The study published in the Bulletin of the Seismological Society of America will help Aotearoa-New Zealand scientists improve their
- [U.S. Earthquake Readiness Depends on Regional Seismic Networks](https://www.seismosoc.org/news/u-s-earthquake-readiness-depends-on-regional-seismic-networks/) - 9 April 2025— Plane crashes are thankfully rare, but when they happen, investigators rely on the airplane’s “black box” for data to explain what happened and how to prevent it in the future. Seismic instruments deployed to gather strong motion data are kind of like those black boxes, said Keith Koper, director of the University
- [At Work: Rebecca Colquhoun](https://www.seismosoc.org/news/at-work-rebecca-colquhoun/) - 11 April 2025—Rebecca Colquhoun liked math and science in school but wasn’t sure what kind of career that might launch. Should they go into physics? Chemistry? Computer science? “I was looking for something that was sort of a mixture, so I could put off deciding for a while longer,” Colquhoun jokes. “Once I understood Earth
- [Seismologists Share Early Analyses of Myanmar Earthquake](https://www.seismosoc.org/news/seismologists-share-early-analyses-of-myanmar-earthquake/) - 15 April 2025—The 28 March magnitude 7.7 Mandalay, Burma (Myanmar) earthquake caused widespread and severe damage in Myanmar and neighboring countries such as Thailand, with more than 5,000 casualties now confirmed. At the Seismological Society of America’s Annual Meeting, researchers from around the globe shared early insights into the earthquake’s fault properties, ground shaking and
- [Fiber Optics Detect Crevasse Icequakes on Alpine Glacier](https://www.seismosoc.org/news/fiber-optics-detect-crevasse-icequakes-on-alpine-glacier/) - 15 April 2025—Fiber optic cable deployed on a Swiss glacier detected the seismic signals of crevasses opening in the ice, confirming that the technology could be useful in monitoring such icequakes, according to a report at the Seismological Society of America’s Annual Meeting. Crevassing is important to the stability of glaciers, especially as these cracks
- [How Well Do Mapped Tectonic Faults Predict the Location of Surface Rupture in the Next Earthquake?](https://www.seismosoc.org/news/how-well-do-mapped-tectonic-faults-predict-the-location-of-surface-rupture-in-the-next-earthquake/) - 16 April 2025—In places where earthquakes rupture the Earth’s surface, scientists often try to predict the location of these future fault ruptures based on the geological fault traces created in past earthquakes. But how accurate are these fault traces in predicting the next rupture location? At the Seismological Society of America’s Annual Meeting, Arizona State
- [Do Earthquakes Affect Car Crashes in the United States?](https://www.seismosoc.org/news/do-earthquakes-affect-car-crashes-in-the-united-states/) - 16 April 2025—Researchers are combining data on earthquake shaking intensity, crowdsourced traffic data from the Waze navigation app and police crash reports to find out if car crashes are more likely during seismic events. So far, the data are too sparse to draw much of a broad conclusion, although the scientists did see some very
- [Strong Shaking at Fault Stepover Has Rocks—Briefly—Defying Gravity](https://www.seismosoc.org/news/strong-shaking-at-fault-stepover-has-rocks-briefly-defying-gravity/) - 16 April 2025—When Julian Lozos visited the site of the 2019 Ridgecrest earthquakes two days after the event, he noticed something strange. Pebble- to boulder-sized rocks clearly had been moved by the earthquakes—but there were no signs of dragging or shearing on the desert ground. He wasn’t the only one to observe this phenomenon at
- [Study Applies AI to Social Media Posts to Estimate Earthquake Ground Shaking Intensity](https://www.seismosoc.org/news/study-applies-ai-to-social-media-posts-to-estimate-earthquake-ground-shaking-intensity/) - 17 April 2025—You’ve probably seen the posts while scrolling on your phone: a shaky TikTok showing shelves emptying and lights swaying inside a convenience store, or a WHAT WAS THAT?? tweet that captures an earthquake in progress. Researchers now show that Google’s large language model (LLM) Gemini can comb through these social media posts to
- [Native American Names Extend the Earthquake History of Northeastern North America](https://www.seismosoc.org/news/native-american-names-extend-the-earthquake-history-of-northeastern-north-america/) - 17 April 2025—In 1638, an earthquake in what is now New Hampshire had Plymouth, Massachusetts colonists stumbling from the strong shaking and water sloshing out of the pots used by Native Americans to cook a midday meal along the St. Lawrence River, according to contemporaneous reports. When Roger Williams, founder of the Rhode Island colony,
- [Lake Deposits Reveal Directional Shaking During Devastating 1976 Guatemala Earthquake](https://www.seismosoc.org/news/lake-deposits-reveal-directional-shaking-during-devastating-1976-guatemala-earthquake/) - 17 April 2025— Sediment cores drawn from four lakes in Guatemala record the distinct direction that ground shaking traveled during a 1976 magnitude 7.5 earthquake that devastated the country, according to researchers at the Seismological Society of America’s Annual Meeting. The earthquake, which killed more than 23,000 people and left about 1.5 million people homeless,
- [How Wide Are Faults?](https://www.seismosoc.org/news/how-wide-are-faults/) - 17 April 2025—At the Seismological Society of America’s Annual Meeting, researchers posed a seemingly simple question: how wide are faults? Using data compiled from single earthquakes across the world, Christie Rowe of the Nevada Seismological Laboratory at the University of Nevada, Reno and Alex Hatem of the U.S. Geological Survey sought a more comprehensive answer,
- [Submarine Telecommunications Cable Detects Road Construction Explosions](https://www.seismosoc.org/news/submarine-telecommunications-cable-detects-road-construction-explosions/) - 17 April 2025—Researchers from Los Alamos National Laboratory have been collecting seismic data from a submarine telecommunications fiber optic cable in coastal Alaska, exploring how the cable could be used to detect signals from earthquakes, ocean currents and marine mammals. Then the researchers learned about construction on an oil spill response facility and road in
- [Could Seismic Signals from Earthquakes Mask the Signals of an Underground Explosion?](https://www.seismosoc.org/news/could-seismic-signals-from-earthquakes-mask-the-signals-of-an-underground-explosion/) - 24 April 2025—Could the seismic signal of an underground nuclear test explosion be “hidden” by the signal generated by a natural earthquake? It’s possible, according to a new review article published in the Bulletin of the Seismological Society of America that contradicts the conventional wisdom about explosion “masking.” The new analysis by Joshua Carmichael and
- [Environmental Seismology Travel Grantees Announced](https://www.seismosoc.org/news/environmental-seismology-travel-grantees-announced/) - Two student members will participate in the 2025 Environmental Seismology Conference with the aid of travel grants made possible by generous donations from the community to the General Fund. Congratulations to: Taylor Kenyon, University of Waterloo, US National Park Service Samara Omar, Colorado School of Mines We congratulate these recipients and are looking forward
- [At Work: Guilherme de Melo](https://www.seismosoc.org/news/at-work-guilherme-de-melo/) - 12 May 2025—In Guilherme de Melo’s small hometown in northeastern Brazil, he remembers constant droughts that plagued the town’s twin livelihoods of agriculture and livestock and led to shortages of potable water. To remedy this, a large dam was built in the early 2000s on the river that flows through the town. Just a few
- [Study of Türkiye Gold Mine Landslide Highlights Need for Future Monitoring](https://www.seismosoc.org/news/study-of-turkiye-gold-mine-landslide-highlights-need-for-future-monitoring/) - 8 May 2025—A new analysis of a fatal landslide that occurred on 13 February 2024 at the Çöpler Gold Mine in Türkiye reveals that the site of the landslide had been slowly moving for at least four years prior to the failure. “Additionally, our analyses detected deformation anomalies in other sectors of the mining operation,
- [SSA Recognizes Trio of Top Reviewers](https://www.seismosoc.org/news/ssa-recognizes-trio-of-top-reviewers/) - 5 May 2025—One of the reasons that Samantha Hansen serves as a reviewer for The Seismic Record is “to get a first look at projects being completed by our peers and colleagues,” she said. “This is not only very interesting, but it can also give you a better understanding of our current state of knowledge
- [2025 SSA Board of Directors Election Results](https://www.seismosoc.org/news/2025-ssa-board-of-directors-election-results/) - February 13—The Seismological Society of America held its Board of Directors election on Friday, 3 January 2025. The following members were elected to a three-year term beginning 14 April 2025 at the SSA Annual Meeting in Baltimore, Maryland. Ashly Cabas, Associate Professor, Department of Civil, Construction, and Environmental Engineering at North Carolina State University
- [Keeping America Safe](https://www.seismosoc.org/news/keeping-america-safe/) - A joint statement by SSA President Heather DeShon and President-Elect Susan Bilek 15 February 2025 — The recent termination of thousands of federal employees, including employees within the U.S. Department of the Interior, Department of Energy and Department of Commerce, will undermine the critical scientific expertise required to keep the country safe from natural hazards
- [Fiber Optics Identify Geohazards for Offshore Wind Projects While Tracking Whale Movements](https://www.seismosoc.org/news/fiber-optics-identify-geohazards-for-offshore-wind-projects-while-tracking-whale-movements/) - 10 January 2025—Using an existing telecommunications fiber optic cable running along the sea floor, researchers identified faults and tracked the locations of whales traveling up and down the central California coast. Their study, published in Seismological Research Letters, demonstrates the potential of distributed acoustic sensing (DAS) for visualizing the geohazards that could impact deep-water offshore
- [SSA Announces Candidates for 2025 Election to Board of Directors](https://www.seismosoc.org/news/election-2025/) - How can SSA best serve your professional needs and continue making advances in the field of seismology? Keep that question in mind as you read the candidate statements below for our 2025 Board of Directors Election. Then be sure to cast your vote! As the governing body for SSA, the Board of Directors helps set the
- [Tiny Seismic Signals Offer a Glimpse of Earth’s Textured Inner Core](https://www.seismosoc.org/news/tiny-seismic-signals-offer-a-glimpse-of-earths-textured-inner-core/) - 1 May 2024--Tiny seismic signals captured around the globe can be used to build a picture of the Earth’s inner core, its fabric made up of differences in the size, shape and orientation of iron grains. This glimpse at the inner core also offers a window into the evolution of the core over Earth’s history,
- [SSA Announces Candidates for 2024 Election to Board of Directors](https://www.seismosoc.org/news/election-2024/) - Help Steer SSA’s Future: Vote Today! How can SSA best serve your professional needs and continue making advances in the field of seismology? Keep that question in mind as you read the candidate statements below for our 2024 Board of Directors Election. Then be sure to cast your vote! As the governing body for SSA, the
- [Supporting International Students](https://www.seismosoc.org/news/supporting-international-students/) - FROM BILL WALTER, PRESIDENT OF SSA 9 July 2020 -- Seismology is a global endeavor, and the international scientific community benefits from a free exchange of people as well as ideas. The Administration’s recent proposal to limit participation by international students in US degree programs would be tragic, both for the individual scientists as well
- [SSA Establishes Standing DEI Committee](https://www.seismosoc.org/uncategorized/ssa-establishes-standing-dei-committee/) - At its 20 November 2021 meeting, the SSA Board of Directors established the Diversity, Equity and Inclusion (DEI) Committee, a standing committee of the SSA Board of Directors. Preamble SSA recognizes the need to have broader representation and participation from all sectors of society, both in its leadership and its membership at large. In this
- [SSA Creates Diversity, Equity and Inclusion Task Force](https://www.seismosoc.org/news/ssa-creates-diversity-and-inclusion-task-force/) - Dear SSA Community: As a Society, we seek to do all we can to make science accessible to all. That goal has inspired a new task force to address diversity and inclusion within our community. Chaired by Aaron Velasco, professor of geological sciences and computational sciences at the University of Texas at El Paso, the
- [2023 SSA Board of Directors Election Results](https://www.seismosoc.org/news/2019-ssa-board-of-directors-election-results-2/) - The Seismological Society of America held its Board of Directors election on Friday, 6 January 2023. The following members were elected to a three-year term beginning 17 April 2023 at the SSA Annual Meeting in Puerto Rico: Annemarie Baltay, research geophysicist, U.S. Geological Survey Principal fields: observational earthquake seismology, earthquake ground motion, earthquake source
- [SSA Announces Candidates for 2023 Election to Board of Directors](https://www.seismosoc.org/news/election-2023/) - Help Steer SSA’s Future: Vote Today! How can SSA best serve your professional needs and continue making advances in the field of seismology? Keep that question in mind as you read the candidate statements below for our 2023 Board of Directors Election. Then be sure to cast your vote! As the governing body for SSA, the
- [SSA and AGU Update Position Statement on Comprehensive Nuclear-Test Ban Treaty](https://www.seismosoc.org/news/ssa-and-agu-update-position-statement-on-comprehensive-nuclear-test-ban-treaty/) - 9 June 2022--In April, the Seismological Society of America (SSA) and the American Geophysical Union (AGU) agreed on minor updates to their position statement, “The Capability to Monitor the Comprehensive Nuclear Test-Ban Treaty (CTBT) Should be Expanded, Completed, and Sustained.” The CTBT is an international agreement to ban all nuclear explosions, and is intended to
- [P. Martin Mai Named BSSA Editor-in-Chief](https://www.seismosoc.org/news/p-martin-mai-named-bssa-editor-in-chief/) - 16 June 2021--The Seismological Society of America (SSA) announced today the appointment of P. Martin Mai as editor-in-chief of the Bulletin of the Seismological Society of America (BSSA). Mai is a professor of geophysics in the Earth Science and Engineering program of the Physical Sciences and Engineering Division at KAUST. He joined KAUST in June
- [2021 Election Results](https://www.seismosoc.org/news/2021-election-results/) - 14 January 2021–SSA announced the election results from the 8 January 2021 election, conducted by YesElections, formerly known as Election America. Three new members will join the board for three-year terms, and one board member was re-elected to a second term: Karen Fischer, Brown University Zhigang Peng, Georgia Tech University Xyoli Pérez-Campos, Universidad Nacional Autónoma de México Carl Tape, University of Alaska Fairbanks
- [A Statement to Our Community](https://www.seismosoc.org/news/statement/) - I write you as the president of SSA, a global society of Earth scientists that values the diversity of voices and backgrounds in our community. Along with the rest of the SSA leadership, I am disturbed and disheartened by the senseless killing of George Floyd in Minneapolis. Recent racist events are a frank reminder that
- [Notice about 2020 Annual Meeting](https://www.seismosoc.org/annual-meeting/notice-about-2020-annual-meeting/) - Dear SSA Community: Thank you for your patience while SSA leadership has closely monitored the novel coronavirus (COVID-19) situation. After careful deliberation, the SSA Board of Directors has decided to not convene the 2020 Annual Meeting. The health and safety of our community is our paramount concern. Guidance from the Centers for Disease Control and
- [2017 SSA Election Results](https://www.seismosoc.org/news/2017-ssa-election-results/) - 9 January 2016 - Seismological Society of America held its election on January 6, 2017. Election America, Inc., tabulated and validated the votes of current members that were received by the deadline, 5 p.m. (Pacific) on January 6. The following nominees for Director were elected to a three-year term beginning in April 2017: Sergio E. Barrientos, National
- [Letter to SSA Members on Executive Order](https://www.seismosoc.org/news/letter-ssa-members-executive-order/) - 31 January 2017 -- In response to the 27 January 2017 White House Executive Order to ban travel to the U.S. from selected countries, SSA President Jim Mori sent this letter today to the SSA membership.

## Pages

- [Home](https://www.seismosoc.org/) - Join SSA today and connect with others who are on the same wavelength. Only together can we advance the science of seismology.
- [Honors](https://www.seismosoc.org/awards/)
- [Expert-Led Career Trainings](https://www.seismosoc.org/jobs/ssa-connect/) - SSA members receive complimentary registration for these virtual events. Join or renew your membership here. Click the events below to learn more and register. Course ➤ Effective Scientific Presentations (20 January-26 March) Webinar ➤ How to Stand Out to Recruiters and Hiring Managers (18 March) Webinar ➤ Identifying Your Transferable Skills in the Geosciences (8 April)
- [Career Development and Training Support](https://www.seismosoc.org/jobs/) - Expert-Led Career Trainings Network, learn, advance seismology SSA At Work Read about the careers of fellow members Job Listings Seismology job opportunities
- [Seismological Research Letters](https://www.seismosoc.org/publications/srl/) - Seismological Research Letters Established in 1987 (1929-1986, known as Earthquake Notes)2024 Impact Factor: 3.2 Seismological Research Letters (SRL) publishes original peer-reviewed research on seismology and related topics of interest to the broad geoscience community. SRL research papers present concise, focused studies that may center on a specific method, data set or event assessed through a
- [Calls for Papers](https://www.seismosoc.org/publications/calls-papers/) - Open Calls for Papers Seismological Research Letters (SRL): Focus Section on Measuring and Monitoring Seismic Instrumentation Submission Deadline: 2 March 2026 Focus Section on Advances in Operational Response Submission Deadline: 15 May 2026 Bulletin of the Seismological Society of America (BSSA): Special Issue on Earthquake Physics, Earthquake Forecasting, and Beyond – 50 Years After the
- [Publishing Policies](https://www.seismosoc.org/publications/publishing-policies/)
- [The Seismic Record](https://www.seismosoc.org/publications/the-seismic-record/) - The Seismic Record The Seismic Record (TSR) is an open-access, online-only journal publishing short form papers covering the entire spectrum of seismological science. The journal provides an outlet for timely dissemination of early results, important updates and current topics that warrant rapid peer review and publication. Papers must be no more than 3500 words and
- [Bulletin of the Seismological Society of America](https://www.seismosoc.org/publications/bssa/) - Bulletin of the Seismological Society of America Established in 19112024 Impact Factor: 2.9 The Bulletin of the Seismological Society of America (BSSA) publishes original peer-reviewed research at the frontiers of seismology and earthquake system science. BSSA papers demonstrate a comprehensive and rigorous treatment of the subject that may include theoretical analyses, in-depth data analyses, advanced
- [Institutional Subscriptions](https://www.seismosoc.org/publications/institutional-subscribers-2/) - Quick Jump Bulletin of Seismological Society of America (BSSA) Rates Seismological Research Letters (SRL) Rates Subscription Terms and Conditions Accessing Your Online Subscription Open Access Options Claims Single-Issue Orders SSA Journals provide your users with vital access to the best and most current scientific research in seismology! The Seismological Society of America (SSA) is mission-driven
- [SSA Meetings](https://www.seismosoc.org/meetings/past-and-future-ssa-annual-meetings/) - Upcoming Meetings 2026 SSA Annual Meeting 14-17 April 2026 – Pasadena, California Co-chairs: Elizabeth Cochran (U.S. Geological Survey) and Kuo-Fong Ma (Institute of Earth Sciences, Academia Sinica) 2026 Optical Seismology and the Next Era in Seismic Sensing 13-16 October 2026 - Kona, Hawaii Co-chairs: Meghan S. Miller (The Australian National University) and Brad Lipovsky (University
- [Associate Editor Resources](https://www.seismosoc.org/publications/associate-editor-resources/) - General Resources for Editors How to Grant Reviewer Role Associate Editor Travel Support Program SSA Guide to Search for Reviewers AE Travel Grant Survey Handout
- [Grants and Fellowships](https://www.seismosoc.org/grants-and-fellowship/) - The Seismological Society of America (SSA) offers a range of competitive grants and fellowships designed to support our members in need — providing financial assistance for travel, research, networking and professional development across the global seismology community. For inquiries into SSA's Grants and Fellowships, email ssagrants@seismosoc.org. Community Grants Program DEADLINE: 28 FEBRUARY Global Travel Grants
- [Your gift to the Kanamori Fund…](https://www.seismosoc.org/support-ssa/the-kanamori-fund/) - Supports the professional development of our community in recognition of Caltech Emeritus Professor Hiroo Kanamori. As a researcher, Kanamori has had an unquestionable impact on the science of seismology. His groundbreaking research on the physics of massive earthquakes, the physics of the long-term crustal processes behind seismic events, and real-time earthquake hazard monitoring mark him
- [SSA Leadership Resources](https://www.seismosoc.org/members/ssa-leadership-resources/) - This page contains information for the current Board of Directors. Current Board Policy Manual and Appendices Board Policy Manual Appendix A: Conflict of Interest Policy Appendix B: SSA and Eastern Section Appendix C: SSA Honors Procedures Appendix D.1: Committees and Committee Functions Appendix D.2: Task Committees Appendix E: Document retention and destruction policy Appendix F:
- [Your gift to the SSA General Fund…](https://www.seismosoc.org/support-ssa/the-general-fund/) - Provides support where it's needed most at SSA. Donations to the unrestricted General Fund will always be directed to the areas where support is most needed in our Society. In addition to supporting the SSA Annual Meeting, the General Fund has also breathed life into bold new ideas that benefit our entire community. Ideas like The Seismic Record,
- [Government Relations Policy Fellowship](https://www.seismosoc.org/us-government-relations/government-relations-policy-fellowship/) - SSA advocates for earthquake science and seismology in Washington, DC. A new program offers student and early-career members the opportunity to gain exposure to the policy making process. SSA's Government Relations Policy Fellowship, established by the Board of Directors in February 2022, offers the opportunity to influence the policy processes that impact seismology. The fellowship
- [SSA Board of Directors, Committees](https://www.seismosoc.org/inside/off-dir/) - Officers of the Board and Board of Directors The Seismological Society of America (SSA) is governed by an elected Board of Directors. The Board provides strategic leadership, financial oversight and policy guidance to ensure that SSA fulfills its mission of advancing seismology and serving the scientific community. Board members are elected by the membership and
- [Past Honors Recipients](https://www.seismosoc.org/awards/past-awards-recipients/) - The Harry Fielding Reid Medal The Charles F. Richter Early-Career Award The Frank Press Public Service Award The Distinguished Service Award William B. Joyner Memorial Lecture The Bruce Bolt Medal The Harry Fielding Reid Medal The Harry Fielding Reid Medal – originally named The Society Medal – has been awarded for outstanding contributions in
- [The COSMOS/EERI/SSA Bruce Bolt Medal](https://www.seismosoc.org/awards/cosmoseerissa-bolt-medal/) - The Bruce Bolt Medal is awarded jointly by the Consortium of Strong Motion Observations Systems (COSMOS), Earthquake Engineering Research Institute (EERI) and SSA to recognize individuals worldwide whose accomplishments involve the promotion and use of strong-motion earthquake data and whose leadership in the transfer of scientific and engineering knowledge into practice or policy has led
- [Global Travel Grants](https://www.seismosoc.org/awards/global-travel-grant/)
- [The SSA Community Grants Program](https://www.seismosoc.org/grants-and-fellowship/the-ssa-community-grants-program/) - Every February and July, all SSA members are invited to apply for a Community Grant, which offers the financial helping hand that so many scientists need to take their small meetings, workshops and other mission-advancing events across the finish line. These donor-funded grants help our members bring seismology to local communities, strengthen capacity for hazard
- [Paul Andrew Spudich Travel Grants](https://www.seismosoc.org/grants-and-fellowship/paul-andrew-spudich-travel-grants-2/) - In February 2024 SSA welcomed the first applications for Paul Andrew Spudich Travel Grants. The new program honors the late seismologist Paul Andrew Spudich by supporting travel for SSA student and early-career members who have a research focus on earthquake source physics or ground motion prediction. The grant program was established by SSA's Paul Andrew
- [Apply for the Global Travel Grant](https://www.seismosoc.org/awards/apply-for-the-global-travel-grant/) - Open every February and July the Global Travel Grant program, offers early-career and student members financial support to attend and present their research at scientific conferences and workshops anywhere in the world. The February application period covers travel from May through October. The July application period covers travel from November through April. All applicants will
- [Environmental Seismology: Earth's Surface and Subsurface Hazards, Dynamics and Resources](https://www.seismosoc.org/environmental-seismology/) - Environmental Seismology: Earth's Surface and Subsurface Hazards, Dynamics and Resources 14–18 October 2025, Denver, CO Researchers are turning increasingly to multidisciplinary studies to better understand a variety of planetary processes, with seismology at the forefront of providing new tools and vital insights in this endeavor. This 2025 topical meeting from SSA invited studies of seismic
- [Thank you for being part of the SSA community!](https://www.seismosoc.org/membership/thank-you-credit-card/) - Your membership has been processed and you will receive a confirmation email shortly. Visit the Virtual Events page to register for complimentary career development trainings for members. Questions? Contact membership@seismosoc.org.
- [Submission Guidelines](https://www.seismosoc.org/publications/the-seismic-record/submission-guidelines/) - The Seismic Record Established in 2021 Editor-in-Chief: Keith Koper ISSN: 2694-4006 The Seismic Record (TSR) is an open-access, online-only journal publishing short form papers covering the entire spectrum of seismological science. Papers must be no more than 3500 words and include no more than 30 references. Submit manuscripts to TSR at https://www.editorialmanager.com/tsr. Authors who publish their
- [Rights and Permissions](https://www.seismosoc.org/publications/permissions-2/) - Note: this policy applies to BSSA and SRL articles published under a traditional Page Charges Agreement. For articles published under a Creative Commons license, please see SSA’s Open Access policy. SSA has partnered with Copyright Clearance Center (CCC) for the administration of permission requests through CCC’s RightsLink service. To submit a permission request, please follow
- [SSA Journals](https://www.seismosoc.org/publications/) - Journals of the SSA Our Publishing Program The SSA journals program is key to the Society’s core purpose of advancing seismology and the understanding of earthquakes for the benefit of society. Our publications help us advance scientific integrity, encourage scientific collaboration, and foster the professional development of scientists and engineers. For Potential Authors Submission guidelines,
- [SRL Editorial Office and Board of Editors](https://www.seismosoc.org/publications/srl/srl-editorial-office/) - Allison Bent, Editor-in-Chief srleditor@seismosoc.org Bent has been a research seismologist with Natural Resources Canada since earning her Ph. D. from the California Institute of Technology in 1990. Her research interests include earthquake sources, earthquakes in stable continental environments, crustal structure, ground motions and the seemingly never-ending issues surrounding magnitudes. Stemming from her research on historical
- [](https://www.seismosoc.org/publications/the-seismic-record/bssa-srl-and-the-seismic-record-tsr/) - Which journal is right for me? Whether you’re a new or established author, you may have questions about submitting a paper to the SSA journals: The Bulletin of the Seismological Society of America (BSSA), Seismological Research Letters (SRL) and SSA's newest journal, The Seismic Record (TSR). Here's a quick guide to each journal: Bulletin of
- [<em>SRL</em> Submission Guidelines](https://www.seismosoc.org/publications/srl-authorsinfo-2/) - Seismological Research Letters (SRL) publishes original peer-reviewed research on seismology and related topics of interest to the broad geoscience community. SRL research papers present concise, focused studies that may center on a specific method, data set or event assessed through a multidisciplinary lens. Submit manuscripts to SRL at https://www.editorialmanager.com/srl/. Papers submitted to SRL must not
- [<em>BSSA</em> Submission Guidelines](https://www.seismosoc.org/publications/bssa-submission-guidelines-2/) - The Bulletin of the Seismological Society of America (BSSA) publishes original peer-reviewed research at the frontiers of seismology and earthquake system science. BSSA papers demonstrate a comprehensive and rigorous focus that may include theoretical analyses, in-depth data analyses, advanced modeling and simulations, and emerging techniques and applications. Submit manuscripts to BSSA at https://www.editorialmanager.com/bssa/. Papers submitted
- [BSSA Call for Papers](https://www.seismosoc.org/publications/calls-papers/bssa-call-for-papers-10/) - Special Issue on Quantifying the Long-term Prehistoric Earthquake Record: Advances and Applications The field of earthquake geology has evolved significantly over recent decades. New technologies such as lidar and other remote-sensing techniques have allowed mapping and characterization of active faults and historical surface ruptures in unprecedented detail. Improved dating and statistical modeling techniques have resulted
- [BSSA Call for Papers](https://www.seismosoc.org/publications/calls-papers/bssa-call-for-papers-11/) - Special Issue on Complex Multi-Fault Earthquakes Recognizing the approaching 10th anniversary of the Kaikōura, New Zealand earthquake, BSSA invites contributions to a special issue on understanding, modeling and forecasting complex multi-fault earthquakes. The Mw 7.8 Kaikōura earthquake on 15 November 2016 was an unusually complex multi-fault earthquake, involving slip on at least 20 faults with
- [Distinguished Service Award](https://www.seismosoc.org/awards/distinguished_service_award/) - Since 2003, the Distinguished Service to SSA Award has honored individuals for their outstanding service to SSA. Past recipients have devoted their time and talents to SSA publications, the preservation of SSA history and other important Society work that helps advance our mission. Awardees become Honorary Members of the Society. Award Criteria This award honors
- [Frank Press Public Service Award](https://www.seismosoc.org/awards/press-award/) - Since 2003, the Frank Press Public Service Award has celebrated outstanding contributions to the advancement of public safety or public information relating to seismology. Past recipients have been recognized for their efforts in building and disseminating critical ideas and tools in seismology; for their work in keeping the public safe, prepared and resilient against earthquakes
- [Charles F. Richter Early-Career Award](https://www.seismosoc.org/awards/richter_award/) - Established in 2005, the Charles F. Richter Early-Career Award is part of SSA’s longstanding commitment to supporting the next generation of seismologists. The award honors outstanding contributions to the goals of the Society by a member early in her or his career and provides recipients with a $3,000 cash award from the William B. Joyner
- [The Harry Fielding Reid Medal](https://www.seismosoc.org/awards/reid_medal/) - With a distinguished list of recipients that reads like a Who’s Who in the field of seismology, The Harry Fielding Reid Medal is SSA’s highest honor. Originally called The Society Medal before its name change in 2005, the award has celebrated outstanding contributions to seismology or earthquake engineering since 1976. Award Criteria The Harry Fielding
- [The Seismic Record Publication Fees](https://www.seismosoc.org/publications/the-seismic-record/the-seismic-record-publication-fees/) - The Seismic Record (TSR) is an open access journal. Articles published in TSR are freely available to read, download and share via the GeoScienceWorld platform. Authors pay a publication fee or Article Processing Charge (APC). If you received a grant to fund your research, the cost of the APC may be included in that grant. The APC
- [SSA Contacts](https://www.seismosoc.org/inside/staff-dir/) - Headquarters Nan Broadbent Executive Director Phone: (510) 559-1782 E-mail: nbroadbent@seismosoc.org Monica Lu Membership Officer Phone: (510) 559-1781 E-mail: mlu@seismosoc.org Andria Marcus Director of Meetings and Events Phone: (510) 559-1784 E-mail: amarcus@seismosoc.org Nikki Perlwitz Program Officer Phone: (510) 525-5474 E-mail: nperlwitz@seismosoc.org Ethan Smith Program Coordinator Phone: (510) 559-1785 E-mail: esmith@seismosoc.org HQ general phone number: 510-525-5474 Finance
- [Statement on Education and Workforce Development](https://www.seismosoc.org/us-government-relations/statement-education-workforce-development/) - Earth sciences help protect our entire planet and all who dwell on it. The Earth sciences field is key to maintaining our nation’s economic prosperity, safety, security and longtime standing as a global leader in scientific innovation. From identifying critical minerals to addressing natural hazards, our world’s future depends on Earth scientists. A robust workforce
- [Statement on Monitoring Earthquakes, Tsunamis and Other Hazards](https://www.seismosoc.org/us-government-relations/statement-earthquake-tsunami-monitoring/) - From earthquakes and tsunamis to mine collapses and explosions, disaster can strike at any time. High-quality monitoring networks enable an immediate and informed response to the wide range of hazardous events that threaten public safety in the United States and around the globe. These observing systems can detect earthquakes, tsunamis, landslides, volcanic eruptions and other
- [Past Annual Meeting Travel Grant Recipients](https://www.seismosoc.org/awards/travel-grant-types/past-annual-meeting-travel-grant-recipients/) - 2026 Travel Grant Recipients These travel grants are made possible by member contributions to the Kanamori Fund and the Annual Meeting Travel Grant Fund. SSA awarded 29 student, early-career, international members and regular member travel grants to attend the Annual Meeting in Pasadena, CA from 14 April – 18 April 2026: Student Recipients: Bartu Bilgen, Middle East
- [SRL Call for Papers](https://www.seismosoc.org/publications/calls-papers/srl-call-for-papers-16/) - Advances in Operational Earthquake and Tsunami Response Science: Delivering Time-Critical and Actionable Advice Seismological Research Letters (SRL) is soliciting papers for a Focus Section on Advances in Operational Earthquake and Tsunami Response Science: Delivering Time-Critical and Actionable Advice. Large earthquakes and tsunamis are among the world’s deadliest and most costly natural hazards and require rapid characterization
- [Abstract Submission Requirements](https://www.seismosoc.org/meetings/submission-system/) - Abstract Guidelines: Abstract submissions open 1 December 2025 and will be accepted until 13 January 2026 at 11:59 PM Pacific (US) time. Please see reminders about our general policies and guidelines below. Your title must include no more than 250 characters including spaces. Your abstract description must include no more than two paragraphs and 2,150
- [Corporate Membership](https://www.seismosoc.org/membership/corporate_membership/) - Meet Our Corporate Members SSA is grateful for the partnership and support of the following members of our community. Each one plays a key role in the Society’s mission of advancing seismology worldwide. To join and/or learn more about the benefits of corporate membership, including discounts to exhibit and attend meetings with our global community, please
- [Renew Your Membership with SSA!](https://www.seismosoc.org/members/renew/)
- [Thank you for registering for the SSA Annual Meeting!](https://www.seismosoc.org/annual-meeting/chkpayment/) - You have registered as PAY LATER for the SSA Annual Meeting from 14-18 April 2026 in Pasadena, California! You will receive an email with the payment instructions listed below. Please consider making a gift to SSA to help ensure access to training, mentoring and information sharing across our global community. Donations enable us to continue
- [Thank you for registering for the SSA Annual Meeting!](https://www.seismosoc.org/annual-meeting/ccpayment/) - Your registration is confirmed for the SSA Annual Meeting from 14-18 April 2026 in Pasadena, California! Please consider making a gift to SSA to help ensure access to training, mentoring and information sharing across our global community. Donations enable us to continue innovating and expanding the network of support that we offer to our members.
- [Meetings](https://www.seismosoc.org/meetings/)
- [<em>BSSA</em> Editorial Staff and Board of Editors](https://www.seismosoc.org/publications/bssa/bssa-editorial-office/) - Martin Mai, Editor-in-Chief bssaeditor@seismosoc.org Mai is Professor of Geophysics at King Abdullah University of Science & Technology, which he joined as founding faculty in June 2009. He received his MS degree from University Karlsruhe (1995), his PhD from Stanford University 2002, and was post-docs (2002-2004) and research scientist (2004 – 2009) at ETH Zurich, Institute
- [The Seismic Record Editorial Board](https://www.seismosoc.org/publications/the-seismic-record/the-seismic-record-editorial-board/) - The Seismic Record Established in 2021 Editor-in-Chief: Keith Koper ISSN: 2694-4006 Main editorial office: tsr@seismosoc.org Keith Koper, Editor-in-Chief tsreditor@seismosoc.org Koper has served as associate professor and professor in the department of geology and geophysics at the University of Utah (United States), and director of the University of Utah Seismograph Stations (UUSS), since 2010. He has
- [William B. Joyner Memorial Lectures](https://www.seismosoc.org/awards/joyner/) - The William B. Joyner Memorial Lecture series was established by SSA in cooperation with the Earthquake Engineering Research Institute (EERI) to honor Bill Joyner’s distinguished career at the U.S. Geological Survey (USGS) and his abiding commitment to the exchange of information at the interface of earthquake science and earthquake engineering. Joyner Lecturers are chosen on
- [Annual Meeting Travel Grants](https://www.seismosoc.org/awards/travel-grant-types/)
- [SSA Art Guidelines](https://www.seismosoc.org/publications/ssa-art-guidelines/) - Final artwork must be submitted as electronic files. The following guidelines will help you prepare final artwork. Close adherence to these guidelines will ensure that your article will not be unnecessarily delayed during the publication process. Color Options: (1) Both Publication Charges and Color Charges Will Be Paid. If you choose this option, you will be
- [Alt-Text for Figures](https://www.seismosoc.org/publications/alt-text-for-figures/) - SSA aims to ensure inclusivity and equal access for millions of readers. In 2026, the SSA journals will require that authors include “alt-text” for figures, which is short text about an image, figure, or graphic that is read by screen readers or other assistive tech and provides information to the reader. In order to make
- [SSA Public Policy Statements](https://www.seismosoc.org/us-government-relations/official-public-policy-statements/) - These are the official statements as approved by the Board of Directors, with the support of the Government Relations Committee: Statement on the Importance of Seismic Research and Monitoring for National Defense Statement on Reauthorization of the National Earthquake Hazards Reduction Program (NEHRP) Statement on Federal Investment in Earthquake Science Statement on the National Volcano
- [BSSA Call for Papers](https://www.seismosoc.org/publications/calls-papers/bssa-call-for-papers-9/) - Special Issue on Earthquake Physics, Earthquake Forecasting, and Beyond – 50 Years After the 1975 Ms 7.3 Haicheng Earthquake This year marks the 50th anniversary of the 1975 Ms 7.3 Haicheng earthquake in northeast China—an event widely recognized as a significant milestone in seismological history. It remains arguably the only major earthquake to have been
- [BSSA Call for Papers](https://www.seismosoc.org/publications/calls-papers/bssa-call-for-papers-8/) - Special Issue on Advancing Physics-Based Ground-Motion Simulations for Seismic Hazard Applications Catalyzed by the successful SSA conference “Future Directions: Physics-based ground-motion modeling” held in Vancouver (10-13 October 2023), the Bulletin of the Seismological Society of America (BSSA) is soliciting papers for a special issue on Advancing Physics-Based Ground-Motion Simulations for Seismic Hazard Applications. Physics-based numerical
- [ES-SSA 2025 Annual Meeting](https://www.seismosoc.org/inside-eastern-section/annual-meeting/) - ES-SSA Annual Meeting 27-28 October 2025 in St. Louis, Missouri Join us at Saint Louis University, where the ES-SSA was founded 100 years ago. Focused primarily on advancing earthquake science in Central and Eastern North America and intraplate seismology, this meeting also welcomes contributions from other aspects of earthquake sciences and seismology. Co-chairs Bob Herrmann,
- [About the Conference](https://www.seismosoc.org/environmental-seismology/about-the-conference/) - The conference will explore marked advances in extracting information from seismic data to investigate phenomena that include cryosphere, ocean, and groundwater dynamics, fluvial processes, cyclones, landslides, erosion, and more. Seismology provides time-continuous data, access to remote regions and tools to monitor earthquakes and explosions. These tools to image the subsurface have been repurposed by scientists
- [One Community. One Mission.](https://www.seismosoc.org/inside/one-community-one-mission/) - One Community. One Mission. SSA strives to forge new connections and information sharing across career stages, disciplines and geographic borders. Our Code of Conduct and Professional Ethics Policy seeks to create and maintain an environment that is welcoming and supportive for all who connect with our community, whether as a member, meeting attendee or author.
- [Government Relations Committee Members](https://www.seismosoc.org/us-government-relations/government-relations-committee-members/) - SSA’s public policy activities include educating our members on policy issues that affect the science, issuing resolutions or position statements on seismic matters, and providing information on seismic issues to U.S. legislators and staff, including responding to invitations to provide testimony before congressional committees. Heather DeShon, Southern Methodist University, Chair Lisa Grant Ludwig, University of
- [Recipient Voices](https://www.seismosoc.org/awards/travel-grant-types/apply/) - Elizabeth Sunday, Iowa State University 2025 Recipient "Attending the SSA meeting boosted my confidence as a researcher and presenter. It allowed me to refine my presentation skills and expand my professional network which is important to my career advancement." Umar Afegbua Kadiri, Centre for Geodesy and Geodynamics, Nigeria 2025 Recipient "By facilitating attendance
- [Annual Report](https://www.seismosoc.org/annual-report/) - Look Back at Previous Years 2023 Annual Report 2022 Annual Report 2021 Annual Report 2020 Annual Report
- [Presenter Information](https://www.seismosoc.org/meetings/presenter-information/) - Guidelines for oral and poster presentations can be found below. Any questions should be directed to: abstracts@seismosoc.org Oral Presentations: Talk Time: All oral presentations will be 15 minutes in length. Please plan your presentation so that there is three minutes for questions from the audience. Slide Format: The following slide formats are acceptable: PowerPoint, Acrobat
- [Attending the Meeting](https://www.seismosoc.org/environmental-seismology/attending-the-meeting/) - We look forward to welcoming you to the Topical Meeting in Denver, Colorado which will include a wide range of engaging lectures and poster presentations on Environmental Seismology. The week will start on Tuesday, 14 October with the opening reception, posters and keynote presentation and conclude on Friday afternoon, 17 October, followed by a field
- [Associate Editor Agreement <em>The Seismic Record</em>](https://www.seismosoc.org/publications/tsr-associate-editor-agreement/) - Associate Editors (AEs) play an essential role in peer-reviewed publishing by supporting the journal Editor-in-Chief (EIC) as subject matter experts on various topics. AEs oversee assigned manuscripts, moving these papers through review and revision. AEs are responsible for assessing manuscript quality, obtaining peer reviews, requesting revisions where appropriate, and making recommendations to the EIC about
- [BSSA Associate Editor Agreement](https://www.seismosoc.org/publications/bssa-associate-editor-agreement/) - Associate Editors (AEs) play a key role in peer-reviewed publishing, supporting the journal Editor-in-Chief (EIC) and Deputy Editor-in-Chief (DE) as subject experts on various topics. AEs oversee assigned manuscripts, moving these papers through review and revision. AEs are responsible for assessing manuscript quality, obtaining peer reviews, requesting revisions where appropriate, and making recommendations to the
- [SRL Call for Papers](https://www.seismosoc.org/publications/calls-papers/srl-call-for-papers-15/) - Environmental Seismology Seismological Research Letters (SRL) is soliciting papers for a Focus Section on Environmental Seismology. Beyond tectonic earthquakes, a broad spectrum of Earth system processes generate ground and air vibrations that can be captured and deciphered by seismic and acoustic sensors — an emerging field now recognized as environmental seismology. These signals originate from
- [SSA Honors Guide](https://www.seismosoc.org/awards/ssa-honors-guide/) - The Harry Fielding Reid Medal (Nominations due 30 September, midnight PST) The Charles F. Richter Early-Career Award (Nominations due 30 September, midnight PST) The Frank Press Public Service Award (Nominations due 30 September, midnight PST) The Distinguished Service to SSA Award (Nominations due 30 September, midnight PST) The COSMOS/EERI/SSA Bruce Bolt Medal (Nominations due 30
- [SRL Call for Papers](https://www.seismosoc.org/publications/calls-papers/srl-call-for-papers-13/) - The 2025 Mw 7.7 Myanmar and Mw 7.1 Tingri Earthquakes: Multidisciplinary Insights into Seismogenesis, Hazard and Community Resilience Seismological Research Letters (SRL) is soliciting papers for a Focus Section on the 2025 Mw 7.7 Myanmar and Mw 7.1 Tingri Earthquakes: Multidisciplinary Insights into Seismogenesis, Hazard, and Community Resilience. 2025 has already witnessed two major earthquakes
- [LaTeX Suggestions](https://www.seismosoc.org/publications/latex-suggestions/) - SSA accepts LaTeX files for online submission, and our compositor can use these files to typeset your article if it is accepted. Please note that LaTeX files are only required after final acceptance; you may upload a PDF for peer review. If you submit LaTeX files, the online submission system will use them and the
- [Sponsorships](https://www.seismosoc.org/environmental-seismology/sponsorships/) - Become a Sponsor at the 2025 Topical Meeting This is a great event to build contacts and become the preferred partner for many scientists. At the October event, you will have the chance to showcase your product and services to your target audience. Additionally, you will be able to attend the event and speak with
- [International Conference on Intraplate and Himalayan Seismology Abstract Submission System](https://www.seismosoc.org/meetings/international-meeting-abstract-submissions/) - Submit: To submit an abstract please take the following steps to begin: Log in to your SSA account. If you do not have an SSA account, you can create one by selecting “Register for an Account.” If you are already logged in, skip to step two. Update your profile using the button below. Make sure your
- [Jesuit Seismological Association Award](https://www.seismosoc.org/awards/jsa-award/) - The Eastern Section of the Seismological Society of America honors outstanding contributions to observational seismology with the Jesuit Seismological Association Award. The award may be given for one specific contribution or for contributions through the years. ES-SSA requests nominations for the 32nd Annual Jesuit Seismological Association (JSA) Award for Contributions to Observational Seismology. The award honors
- [Student Membership Form](https://www.seismosoc.org/membership/student/)
- [Regular Membership Form](https://www.seismosoc.org/membership/regular/)
- [Early Career Membership Form](https://www.seismosoc.org/membership/early-career/)
- [Low - Middle Income Country Membership Form](https://www.seismosoc.org/membership/developing-country/)
- [Emeritus Membership Form](https://www.seismosoc.org/membership/emeritus/)
- [Members' Area](https://www.seismosoc.org/members/) - Take Advantage of Your Member Benefits Journals Explore the premier peer-reviewed publications in seismology. Career Training Grow with ongoing mentoring, workshops and trainings. Grant Opportunities Advance seismology with the support of grants/fellowships. Questions? Email membership@seismosoc.org As an Officer or Member of the Board, you have access to all member-restricted content, as well as files related
- [Join Us](https://www.seismosoc.org/membership/) - “All the people I ‘know’ from papers finally have a face, and my network has expanded so much.” – Katleen Wils, University of Ghent “I published my first paper in an SSA journal, which helped me get into grad school and start my career." – Nicolas Desalvio, Scripps/UC San Diego “Attending the SSA Annual Meeting
- [Become a Member to Vote!](https://www.seismosoc.org/membership/become-a-member-to-vote/)
- [Global Travel Grant Recipients and Announcements](https://www.seismosoc.org/awards/past-gtg/) - List of Global Travel Grant Recipients Stories from Global Travel Grant Recipients All Global Travel Grant Recipients Find the list of SSA Global Travel Grant recipients below. Learn more about the travel grant and application process here. Year Grantee Program Location Amount July 2025 Cyril Journeau Annual Workshop IASPEI/IAVCEI 2025 Volcano Seismology & Acoustics Pucón,
- [BSSA Call for Papers](https://www.seismosoc.org/publications/calls-papers/bssa-call-for-papers-5-5/) - Earthquakes in Slowly Deforming Mountain Belts: The 2023 Moroccan High Atlas Earthquake and the 2023 western Afghanistan Mw 6.3 earthquake quadruplet Call for Papers in French Call for Papers in Arabic The Bulletin of the Seismological Society of America (BSSA) is soliciting papers for a Special Issue on earthquakes in slowly deforming mountain belts, with
- [Abstract and Session Proposals](https://www.seismosoc.org/meetings/meeting-submissions/) - Thank you for your interest in participating. At SSA we leave the creation of our event programs to those who know seismology best: the almost 3,000 members of our global community. Submit a session proposal for the 2026 Annual Meeting. Submit an abstract for the 9th Annual Convention on Advances in Earthquake Science - 2026
- [International Conference on Intraplate and Himalayan Seismology Abstract Submission System](https://www.seismosoc.org/meetings/international-submission-system/)
- [Artificial Intelligence Guidelines for Authors and Reviewers](https://www.seismosoc.org/publications/ai-guidelines/) - The submission and publication of text, images, figures, or graphs created by artificial intelligence, machine learning, language model, generative artificial intelligence, or similar algorithmic technology (hereafter referred to as an “AI tool”) is discouraged at all SSA journals, unless they are part of a study’s formal research design or methods. For the purposes of these
- [Reviewer Information](https://www.seismosoc.org/publications/bssa/reviewer-information/) - BSSA, SRL and TSR Reviewer Guidelines Thank you for agreeing to review a paper for BSSA, SRL or TSR. The quality and timeliness of the journals rely on the volunteer efforts of referees, and these efforts are greatly appreciated. Our community depends on your thorough feedback to authors so that published research is the highest quality possible. Conflict of
- [2025 Subscription Rates](https://www.seismosoc.org/publications/2025-subscription-rates/) - BSSA Volume 115 - 2025 Subscription Rates Includes online access during the subscription period to the entire BSSA electronic edition (1911 to present) 2025 BSSA SUBSCRIPTION RATES Online Print + Online, US Print + Online, Outside US (Except India) Print + Online, India Higher Ed Small (
- [Associate and Affiliate Memberships](https://www.seismosoc.org/membership/associate-affiliate-memberships/) - SSA collaborates with the Earthquake Engineering Research Institute (EERI) to offer affiliated memberships. Associate Members of SSA EERI members may select to affiliate with SSA for $100/year to receive online access to Seismological Research Letters (SRL), be included in the SSA membership roster and receive complimentary registration for virtual webinars. EERI members seeking full benefits of
- [About SSA](https://www.seismosoc.org/inside/) - About SSA The Seismological Society of America (SSA) has worked to advance seismology worldwide for more than a century. The Society’s three peer-reviewed journals are the heart of our small nonprofit operation. Widely read and cited, these publications encourage scientific collaboration and foster the professional development of scientists and engineers around the globe. The publishing
- [Presidents of the Society](https://www.seismosoc.org/inside/history/presidents-society/) - Susan Bilek (2025) Heather DeShon (2024) Ruth Harris (2023) Peggy Hellweg (2022) John Townend (2021) Bill Walter (2020) Susan Hough (2019) Peter Shearer (2018) Andy Michael (2017) Jim Mori (2016) Ruth Harris (2015) Lisa Grant Ludwig (2014) Tom Jordan (2013) Christa von Hillebrandt–Andrade (2011–12) Richard C. Aster (2009–10) William L. Ellsworth (2007–08) Michael Fehler (2005–06)
- [100 Years of SSA](https://www.seismosoc.org/inside/history/100years/) - As part of SSA’s centennial celebration, leading up to the society's 100th Anniversary in 2006, a series of columns focusing on the Society’s legacy, founding and early history was published in SRL volume 77, issues 1-6. Follow the button below to read the "100 Years of SSA" articles in each issue.
- [Perry Byerly's General History of the Society](https://www.seismosoc.org/inside/history/byerly_history/) - History of the Seismological Society of America By Perry Byerly (excerpted from Bulletin of the Seismological Society of America, Vol. 54, No. 6, pp. 1723-1741; December 1964) The Organization of the Society The Early Days before the Bulletin The Bulletin Policy Statements and Extramural Actions Accomplishments of the Society About the Author The Organization of the Society Alexander
- [Eastern Section-SSA](https://www.seismosoc.org/inside-eastern-section/)
- [Register for account](https://www.seismosoc.org/register-for-account/)
- [List of Countries Eligible for Low-Middle Income Country Membership](https://www.seismosoc.org/membership/developingcountrylist/) - Afghanistan Congo, Rep. Iran, Islamic Rep. Morocco St. Vincent and the Grenadines Albania Costa Rica Iraq Mozambique Sudan Algeria Côte d'Ivoire Jamaica Myanmar Suriname American Samoa Croatia Jordan Namibia Swaziland Angola Cuba Kazakhstan Nauru Syrian Arab Republic Argentina Djibouti Kenya Nepal Tajikistan Armenia Dominica Kiribati Nicaragua Tanzania Azerbaijan Dominican Republic Korea, Dem. People's Rep. Niger
- [The Benefits of SSA Membership](https://www.seismosoc.org/membership/member-benefits/)
- [History and Recent Incorporation](https://www.seismosoc.org/inside-eastern-section/history-recent-incorporation/) - Eastern Section History and Recent Incorporation from Seismological Research Letters, Vol. 80, No. 2, May/June 2009 By David W. Eaton, President, Eastern Section of the SSA On Monday, October 6, 2008, the members of the Eastern Section of the Seismological Society of America who were in attendance at its annual scientific meeting in Kingston, Canada, voted
- [Eastern Section History](https://www.seismosoc.org/inside-eastern-section/eastern-section-history/) - History of the Eastern Section of the Seismological Society of America Prepared by the 1999 ES-SSA Executive Committee: Jer-Ming Chiu, Gail Atkinson, Maurice Lamontagne, Waverly Person, and Christine Powell PREFACE At the 70th annual ES-SSA meeting, held at Millersville University, Millersville, Pennsylvania, on October 18-20, 1998, the Executive Committee of the ES-SSA accepted the offer extended
- [2026 Annual Meeting](https://www.seismosoc.org/annual-meeting/)
- [Environmental Seismology: Earth’s Surface and Subsurface Hazards, Dynamics and Resources Registration](https://www.seismosoc.org/meetings/topical-registration/)
- [Governance](https://www.seismosoc.org/inside/governance/) - The Board of Directors serves as the governing body for SSA. Elected by our community every January, Board members set broad policy and direction for our nonprofit Society, helping SSA accomplish its mission of advancing seismology worldwide. To achieve this mission, SSA expects every member and all who participate in SSA-sponsored programs to adhere to the
- [SSA's Diversity, Equity and Inclusion Committee](https://www.seismosoc.org/inside/ssas-diversity-equity-and-inclusion-committee/) - SSA’s Diversity, Equity and Inclusion Committee At its 20 November 2021 meeting, in recognition of the need for SSA to have broader representation and participation from all sectors of society, both in its leadership and its membership at large, the SSA Board of Directors established the Diversity, Equity and Inclusion (DEI) Committee. A standing committee
- [](https://www.seismosoc.org/publications/the-seismic-record/about-the-seismic-record/) - Discover more about The Seismic Record (TSR) At its April 2020 meeting, the SSA Board of Directors approved the launch of a new open access journal that features short rapid-publication peer-reviewed articles on the full breadth of seismology. A new, short form, editorially distinct journal What is the intent of The Seismic Record? The Seismic Record
- [<em>SRL</em> Data Mine Author Information](https://www.seismosoc.org/publications/srl/srl-data-mine-author-information/) - Data Mine columns in SRL are peer-reviewed articles that document recent experiments and point readers to the location of accessible data collected during the experiment. Motivation The motivation for creating Data Mine in SRL is to ensure that seismological and other experiments are documented via a timely, citable peer-reviewed reference that describes the data collected,
- [SSA Media Policy](https://www.seismosoc.org/publications/publishing-policies/ssa-embargo-policy/) - SSA encourages authors’ institutions to work with the media and bring attention to the science published in our journals. In interviews with media about the findings in a specific paper, authors can share that the paper will be published in an SSA journal after they receive notification of their Author Accepted Manuscript (AAM). This applies
- [Data and Resources Section Guidelines](https://www.seismosoc.org/publications/data-resources-section-guidelines/) - Data and Resources Section Guidelines The Society requires that authors identify the sources of data used during research and give information about whether those sources are available to readers. A Data and Resources section must precede the Acknowledgements section. This section should be used to identify all data sources that are not taken from published
- [Supplemental Material Guidelines](https://www.seismosoc.org/publications/esupps/) - Authors may include Supplemental Material with submissions to the Bulletin of the Seismological Society of America (BSSA) and Seismological Research Letters (SRL). The Seismic Record (TSR) may consider Supplemental Material at the Editor-in-Chief’s discretion. All Supplemental Material is subject to peer review. By definition, Supplemental Material enhances understanding of a submission but isn’t integral to that understanding. In other
- [<em>BSSA</em> & <em>SRL</em> Publication Fees](https://www.seismosoc.org/publications/journal-publication-charges-2/) - The Seismological Society of America requests that institutions supporting research share in the cost of publicizing the results of that research. Publication charges are based on the final number of printed pages in the journal. Additional costs may be charged to authors who introduce substantive changes late in the production process. Some special features/columns in
- [Journal Offprint Pricing](https://www.seismosoc.org/publications/offprints/) - Offprints are reprints of an article printed on the same paper type and printing process that creates the print journal, with or without covers. The title of the article appears on page 1 even if it appears on an even-numbered page in the journal. Authors may order offprints at the time final proofs are approved.
- [Author Sharing Policy](https://www.seismosoc.org/publications/author-sharing-policy-2/) - Note: this policy applies to authors of BSSA and SRL articles published under our Page Charges model, detailing how they may use and share the article content. For articles published under a Creative Commons license, please see SSA’s Open Access policy. SSA permits authors to post the article citation information anywhere at any time including
- [Which Journal Is Right for You?](https://www.seismosoc.org/publications/which-journal-is-right-for-you-2/) - Is BSSA or SRL the best fit for your paper? Whether you’re a new or established author, you may have questions about submitting a paper to the SSA journals. Both BSSA and SRL are prestigious peer-reviewed journals featuring international content, readership and editorial staff. Our website offers detailed submission guidelines for both BSSA and SRL to guide authors, but here’s a summary that will help you
- [Statement on the Importance of Seismic Research and Monitoring for National Defense](https://www.seismosoc.org/us-government-relations/importance-of-seismic-research-and-monitoring-for-national-defense/) - Scientists at federal agencies, national labs and universities in the U.S. conduct seismic research and operate global and regional seismic monitoring networks that play a key role in the protection of our nation and its citizens. The Seismological Society of America (SSA) urges Congress to make policy and funding decisions that support and strengthen these
- [SRL Call for Papers](https://www.seismosoc.org/publications/calls-papers/srl-call-for-papers-14/) - Measuring and Monitoring Seismic Instrumentation Seismological Research Letters (SRL) is soliciting papers for a Focus Section on Measuring and Monitoring Seismic Instrumentation. Inertial broadband seismometers, digitizers and other modern monitoring tools are now often deployed in the field for long time intervals to measure earthquakes, explosions and other signals of interest. They allow high quality measurements over
- [SRL Call for Papers](https://www.seismosoc.org/publications/calls-papers/srl-call-for-papers-12/) - Intraplate Earthquakes Seismological Research Letters (SRL) is soliciting papers for a Focus Section on Intraplate Earthquakes. More than a half century after plate tectonics provided an overarching framework to explain earthquakes along active plate boundaries, numerous theories have been proposed to explain where, why, and how often earthquakes occur well away from active plate boundaries,
- [Topical Meeting Abstract Payment Form](https://www.seismosoc.org/meetings/topical-abstract-payment-form/)
- [Pay Your Subscription Online](https://www.seismosoc.org/publications/pay-your-subscription-online/) - Please use the form below to complete your institutional subscription payment. Your institutional subscription will be renewed within one business day. If you have any questions or if you would like a formal invoice, please contact subscriptions@seismosoc.org. Thank you for your support of the Seismological Society of America. [civicrm component="contribution" id="41" mode="live" hijack="0"
- [Photonic Seismology: Lighting the Way Forward](https://www.seismosoc.org/photonic/)
- [Annual Meeting Travel Grant Fund](https://www.seismosoc.org/support-ssa/the-annual-meeting-travel-grant-fund/) - Thank You for Your Support A gift of any amount to the Annual Meeting Travel Grant Fund helps SSA provide students and early-career members with travel grants to attend the SSA Annual Meeting. These grants, which cover travel and registration costs and include childcare support for parents, help our newest scientists network, present research and receive
- [Policy & Advocacy](https://www.seismosoc.org/us-government-relations/)
- [Thank You For Donating](https://www.seismosoc.org/thank-you-for-donating/) - Travel grant recipients at the 2018 Seismology of the Americas meeting. Your donation has been processed! Donations provide opportunities for our members ranging from career development workshops to Annual Meeting travel grants. They also let SSA explore new ways to serve the community. Thank you for supporting seismology.
- [Geosciences Congressional Visits Day](https://www.seismosoc.org/us-government-relations/geocvd/)
- [Kanamori Fund Supports Future Seismologists, Engineers](https://www.seismosoc.org/ssa-kanamori-fund/) - Follow in Kanamori's footsteps. Donate to SSA. It takes a lot to impress the brainpower assembled at a place like Caltech, but Emeritus Professor Hiroo Kanamori regularly had the denizens of the Seismological Laboratory feeling inspired—and maybe just a little bit envious. “Perhaps the most enduring observation I have about Hiroo is that he can
- [Your gift to the William B. Joyner Memorial Fund…](https://www.seismosoc.org/support-ssa/the-william-b-joyner-memorial-fund/) - Makes possible both the William B. Joyner Lecture Series and the Charles F. Richter Early Career Award. By supporting the fund, you can help educate others, honor outstanding work and inspire new accomplishments in our community. The Joyner lecture series honors William B. Joyner’s career at the U.S. Geological Survey (USGS) and his commitment to continuing
- [Your planned gift…](https://www.seismosoc.org/support-ssa/planned-giving-2/) - Ensures the future of seismology. What can a planned gift do? In the case of Clarence Allen (1925-2021), it can bring countless career-changing opportunities to seismologists in our community for many years to come. Allen, the late Caltech professor emeritus of geology and geophysics and SSA’s 41st president, left nearly $1.6 million dollars for our
- [The Paul Andrew Spudich Fund](https://www.seismosoc.org/support-ssa/spudich-fund/) - The Paul Andrew Spudich Fund has been established at SSA to honor the life and accomplishments of Paul Andrew Spudich (1950-2019), a giant in seismology. The Paul Andrew Spudich Fund provides support to early-career and student members who have a research focus on earthquake source physics or ground motion prediction, areas Spudich made important contributions
- [William B. Joyner Memorial Fund](https://www.seismosoc.org/awards/joyner/william-b-joyner-memorial-fund/) - Contribute to the Joyner Fund The William B. Joyner Memorial Fund was established shortly after Bill's death on 24 March 2001 to honor his distinguished career at the U.S. Geological Survey and his relentless pursuit of bringing earthquake seismology and earthquake engineering closer together, so as to provide for a safer society. Unlike most Earth
- [Student Presentation Awards](https://www.seismosoc.org/awards/student-awards/) - 15 May 2025 – SSA announced today the recipients of the 2025 Student Presentation Award, which honors excellent poster or oral presentations at the Annual Meeting, held in Baltimore, Maryland in April. Nominated by meeting attendees, a three-person judging panel selected the 12 award recipients among the eligible pool of student presenters. 2025 Recipients
- [Past Global Travel Grant Recipients](https://www.seismosoc.org/awards/past-gtg-recipients/) - Find the list of SSA Global Travel Grant recipients below. Learn more about the travel grant and application process. Year Grantee Program Location Amount February 2021 Molly Gallahue EGU General Assembly 2021 Virtual $150 February 2020 Piotr A. Bońkowski 17th World Conference on Earthquake Engineering Sendai, Japan $2,500 February 2020 Ezgi Karasozen General Assembly of
- [SSA At Work](https://www.seismosoc.org/inside/ssa-at-work/) - What is a seismologist, and what does she or he do all day? The At Work column gives you a chance to meet our members and learn more about the broad span of disciplines and careers within seismology. Know someone who should be profiled in this column? Send your thoughts to Becky Ham at press@seismosoc.org
- [Diversity, Equity and Inclusion](https://www.seismosoc.org/inside/dei-initiatives/) - SSA Establishes DEI Committee At its 20 November 2021 meeting, the SSA Board of Directors established the Diversity, Equity and Inclusion (DEI) Committee, a standing committee of the SSA Board of Directors. Preamble SSA recognizes the need to have broader representation and participation from all sectors of society, both in its leadership and its membership
- [Revocations Procedures](https://www.seismosoc.org/inside/revocations-procedures/) - Membership & Awards Revocation Procedures[1] SSA members and awardees are expected to meet commonly held standards of professional ethics and scientific integrity. In the rare cases in which SSA members or awardees no longer meet this expectation by engaging in conduct that is prejudicial to SSA’s corporate purposes and interests, SSA will consider revoking their
- [Community Grants Application Form](https://www.seismosoc.org/inside/community-grants-application-form/) - There is a 2,000 character limit per field (400 words). If your answers exceed that limit, please email your application in PDF format to ssagrants@seismosoc.org.
- [BSSA E-mail Alerts](https://www.seismosoc.org/publications/bssa/bssa-e-mail-alerts/) - BSSA E-mail Alerts If you'd like to receive email alerts when new issues of BSSA (and SRL) are published click here to subscribe to the SSA Contents Alert. BSSA Contents RSS Feeds A listing of the contents (and article abstracts) of the current and recent issues of BSSA are also available as RSS feeds: Current Issue: RSS Recent Issues: RSS
- [Rates](https://www.seismosoc.org/publications/bssa/rates/) - BSSA Subscription Terms and Rates Print ISSN: 0037-1106 Online ISSN: 1943-3573 The Bulletin of the Seismological Society of America (BSSA) is the primary English-language journal of advanced research in seismology and related disciplines. It first appeared in 1911 and was issued on a quarterly basis until 1963. Since 1963, BSSA has appeared bimonthly (February, April,
- [Back Issues](https://www.seismosoc.org/publications/bssa/back-issues/) - BSSA Back Issues Many back issues of the Bulletin are available. Prices vary and are listed below. SSA members may take a 15% discount on any order. There will be a 20% surcharge (based on total purchase price, before member discount) on orders mailed outside of the United States to cover higher postage costs. If
- [Open-Access Policy](https://www.seismosoc.org/publications/open_access-2/) - The Seismological Society of America (SSA) offers multiple open-access options when publishing in our journals. When publishing in the Bulletin of the Seismological Society of America (BSSA) and Seismological Research Letters (SRL), authors submitting after November 15, 2024 may choose to publish either under a Page Charges Agreement or under an Open-Access license. All articles published in The Seismic
- [Future Directions: Physics-based ground motion modeling](https://www.seismosoc.org/groundmotion-2/) - Thank You to Our Sponsors
- [Fall Meeting Abstract Submissions](https://www.seismosoc.org/meetings/fall-meeting-submissions/) - Welcome! Thank you for your interest in participating in the Environmental Seismology: Earth’s Surface and Subsurface Hazards, Dynamics and Resources conference in Denver, Colorado. Abstract submissions will be accepted 1 April - 20 May, 2025. Questions about your abstract or attending the Environmental Seismology conference? Email abstracts@seismosoc.org. We look forward to seeing you this October!
- [Watch SSA 2021 Highlights](https://www.seismosoc.org/meetings/ssa-2021-recordings-2/)
- [Meetings Code of Conduct](https://www.seismosoc.org/meetings/code-of-conduct/) - Meetings Code of Conduct [1] The Seismology Society of America (“SSA” or “the Society”) is committed to providing a safe, productive and inclusive environment for “SSA Meetings” that fosters open dialogue and exchange of scientific ideas, promotes full participation and belonging for all participants, and is free of discrimination and harassment. In this context, discrimination
- [SSA 2021 Highlights](https://www.seismosoc.org/meetings/ssa-2021-recordings/)
- [SRL Call for Papers](https://www.seismosoc.org/publications/calls-papers/srl-call-for-papers-11/) - Earthquake-Induced Ground Deformation Seismological Research Letters (SRL) is soliciting papers for a Focus Section on Earthquake-Induced Ground Deformation. Ground failure due to earthquake-induced liquefaction and landsliding has caused substantial damage in the past and continues to pose substantial risks to critical infrastructure. The consideration of ground failure is central to engineering analysis and design, ranging
- [Support SSA](https://www.seismosoc.org/support-ssa/) - Your tax-deductible gift helps SSA in its mission to advance seismology worldwide The SSA General Fund This unrestricted fund directs donations to where they are most needed at SSA. The Annual Meeting Travel Grant Fund A gift to this fund helps our student and early-career members participate in the SSA Annual Meeting. The William
- [Our Publishing Program](https://www.seismosoc.org/publications/program/) - Our Publishing Program The SSA journals program is key to the Society’s core purpose of advancing seismology and the understanding of earthquakes for the benefit of society. Our publications help us advance scientific integrity, encourage scientific collaboration and foster the professional development of scientists and engineers. We rely on our editors and reviewers, along with
- [Federal Investment in Seismology Matters](https://www.seismosoc.org/us-government-relations/seismology-matters/) - U.S. earthquake science protects Americans and the places they live and work. Sustained federal funding for seismology is key to that protection. There are no comparable private funders. Safety and Security The impacts of federally funded seismic science are geographically widespread, including near real time earthquake information to support an earthquake and tsunami early warning
- [BSSA Call for Papers](https://www.seismosoc.org/publications/calls-papers/bssa-call-for-papers-7/) - Special Issue on Earthquake Hazards 25 Years after Chi-Chi: Learning from the Past to Prepare for the Future The Bulletin of the Seismological Society of America (BSSA) is soliciting papers for a Special Issue on Earthquake Hazards 25 Years after Chi-Chi: Learning from the Past to Prepare for the Future. The devastating 21 September 1999,
- [SRL Call for Papers](https://www.seismosoc.org/publications/calls-papers/srl-call-for-papers-10/) - The OSIRIS-REx Re-entry Seismological Research Letters (SRL) is soliciting papers for a Focus Section on the OSIRIS-REx Re-entry. The 24 September 2023 re-entry of NASA’s OSIRIS-REx Sample Return Capsule (SRC) was only the fifth re-entry from interplanetary space since the end of the Apollo era. It provided a unique opportunity to geophysically observe an ‘artificial
- [Diversity, Equity and Inclusion Committee Members](https://www.seismosoc.org/inside/dei-committee/) - Diversity, Equity and Inclusion Richard Alfaro Jeff Bayless Sue Bilek Esteban Chaves Heather DeShon Kevin Kwong Lisa Grant Ludwig Mariah Jenkins Meghan Miller Leah M. Salditch
- [SSA First Paper in an SSA Journal](https://www.seismosoc.org/inside/journal-survey/)
- [Diversity, Equity and Inclusion Task Force](https://www.seismosoc.org/inside/diversity-and-inclusion/) - Read Update The SSA Board of Directors established the Diversity, Equity and Inclusion (DEI) Task Force in July 2020. The official charter and list of committee members follows. Charter Goal: Create substantive, positive change within the SSA organization and membership that addresses historic and current inequities within our Society and the broader science community. Motivation:
- [DEI Committee](https://www.seismosoc.org/inside/dei-initiatives/dei-committee/) - Diversity, Equity and Inclusion Committee Established 2021 Richard Alfaro Jeff Bayless Sue Bilek Esteban Chaves Heather DeShon Lisa Grant Ludwig Monique Holt Mariah Jenkins Meghan Miller Leah M. Salditch Aaron Velasco
- [View Transactions and Event Registrations](https://www.seismosoc.org/members/dashboard/)
- [PAP TOC signup](https://www.seismosoc.org/publications/paptocsignup/) - Sign up for notifications Receive weekly emails about recent content in BSSA, SRL and TSR. Readers can receive updates about new papers as they “Publish-Ahead-of-Print” (PAP) and as new issues are released, via our Table of Contents (TOC) alerts. To be added to the mailing list, please send your name and email address to info@seismosoc.org.
- [Copyright Transfer Policy](https://www.seismosoc.org/publications/copyright-transfer-policy-2/) - Upon submission of a manuscript to BSSA or SRL, authors may choose between the Page Charges/Copyright Transfer Agreement or an Open Access/ Creative Commons (CC-BY) license. All TSR articles are published under a CC-BY license. When transferring copyright to SSA, the authors affirm that the article has not been previously copyrighted and has not been
- [Donate to the Annual Meeting Travel Grant Fund](https://www.seismosoc.org/support-ssa/donate-to-the-annual-meeting-travel-grant-fund/) - [civicrm component="contribution" id="36" action="transact" mode="live" hijack="0" civititle="hide"]
- [Community News](https://www.seismosoc.org/inside/community-news/) - Community News
- [Join Us](https://www.seismosoc.org/membership/individual-membership/) - SSA welcomes all who share our mission to advance earthquake science. Whether you are a scientist or an engineer, a student or a veteran, you will find the SSA community to be a welcoming, inclusive and supportive one. We recognize our members' excellence with awards, build their networks through travel grant programs and further their
- [Privacy Policy](https://www.seismosoc.org/inside/privacy-policy/) - This Privacy Policy describes the types of personal and non-personal information we collect on the SSA website and through the Editorial Manager, a third-party vendor that we contract with to provide services to SSA, how we use such information and to whom and under what circumstances we may disclose it. Every Society director, officer, volunteer,
- [Planned Giving](https://www.seismosoc.org/membership/planned-giving/) - Your planned gift ensures the future of seismology. Every gift to SSA is an act of kindness. We are all traveling on a professional journey, and giving to others represents the choice to stop, pull over and assist. One of the greatest acts of kindness, one that can help more people than you may have
- [Corporate Members](https://www.seismosoc.org/inside/corporate-memb/) - Corporate membership in the Seismological Society of America (SSA) provides an opportunity for institutions to demonstrate their commitment to seismology and related disciplines. Corporate members are listed prominently on the inside back cover of Seismological Research Letters and profiled below. Corporate members receive three complimentary online subscriptions to Bulletin of the Seismological Society of America (BSSA) and Seismological Research Letters
- [History](https://www.seismosoc.org/inside/history/) - Strong leadership, clear focus and a pioneer spirit made the dream of a seismological society a reality. San Franciscans were still feeling the aftershocks of the 1906 great earthquake when Professor Alexander G. McAdie described the need for the Seismological Society of America, an organization that would publish “the best information obtainable concerning earthquakes, and
- [Bylaws](https://www.seismosoc.org/inside/bylaws/) - Bylaws of the Seismological Society of America A California Nonprofit Public Benefit Corporation Approved March 25, 2024 ARTICLE I Name, Principal Office, Purpose and Restrictions 1.01 Name. The name of the association is Seismological Society of America (“Society”). 1.02 Principal Office. The Board of Directors (“Board”) shall determine the location of the principal office of
- [BSSA Call for Papers](https://www.seismosoc.org/publications/calls-papers/bssa-call-for-papers-5-6/) - Special Issue on Improving Measurements of Earthquake Source Parameters The Bulletin of the Seismological Society of America (BSSA) is soliciting papers for a Special Issue on Improving Measurements of Earthquake Source Parameters. Earthquake source parameters such as magnitude, seismic moment, source dimension, stress drop, and radiated energy are fundamental to understanding earthquake physics, and also
- [Information for Press](https://www.seismosoc.org/newsroom/information-for-press/) - SSA encourages members of the press to attend the Annual Meeting, preview journal articles and interview its members. Members of the press should contact SSA Press Liaison Becky Ham via email at press@seismosoc.org.
- [Style Guide Requirements for Abstracts](https://www.seismosoc.org/meetings/style-guide-requirements-for-abstracts/)
- [Life Membership Interest Form](https://www.seismosoc.org/members/life-membership-interest-form/)
- [Past ES-SSA Meetings](https://www.seismosoc.org/inside-eastern-section/past-es-ssa-meetings/) - View the past Eastern Section-SSA Annual Meetings here. 2023 22-24 October 2024 -- Southern Methodist University in Dallas, Texas Chairs: Stephen Arrowsmith, Heather DeShon and Nicos Makris 2022 23-25 October 2022 – University of South Florida in Tampa, Florida Chairs: Steve McNutt and Jochen Braunmiller 2021 18-22 October 2021 – Held virtually Chairs: Andy Newman
- [Current Officers](https://www.seismosoc.org/inside-eastern-section/current-officers/) - Eastern Section Officers and Directors (2023-2025) Mike Brudzinski, President Seth Carpenter, Vice President Xiaowei Chen, Secretary John Ebel, Treasurer Steven Jaumé, Fifth Member List of Past Officers
- [Eastern Section Past Officers](https://www.seismosoc.org/inside-eastern-section/eastern-section-past-officers/) - Eastern Section Past Officers Years Chairman Vice-Chairman Secretary Treasurer Fifth Member 2021-2023 Steven Jaume Mike Brudzinski Seth Carpenter John Ebel Zhigang Peng 2019-2021 Zhigang Peng Steven Jaume Mike Brudzinski John Ebel 2017-2019 Christine Goulet Zhigang Peng Steven Jaume Charles Scharnberger 2015-2017 Oliver Boyd Christine Goulet Zhigang Peng Charles Scharnberger 2013-2015 Chris Cramer Oliver Boyd Christine
- [Reauthorization of the National Earthquake Hazards Reduction Program (NEHRP)](https://www.seismosoc.org/us-government-relations/comment-reauthorization-national-earthquake-hazards-reduction-program-nehrp/) - Statement by SSA Board of Directors on the Reauthorization of the National Earthquake Hazards Reduction Program (NEHRP) The Seismological Society of America supports the reauthorization of the National Earthquake Hazards Reduction Program (NEHRP) and urges Congress to reauthorize and fully fund this critical public safety legislation. Seventy-five percent of the United States population is exposed
- [Statement on Federal Investment in Earthquake Science](https://www.seismosoc.org/us-government-relations/statement-federal-investment-earthquake-science/) - A strong, sustained investment in federal geoscience programs, specifically earthquake science, enhances national security, strengthens our global and economic competitiveness, supports resilient communities and cultivates a highly skilled workforce. Basic geoscience and earth science research help the nation monitor and prepare for earthquakes and other natural disasters, understand and protect the environmental health of the
- [Donate to the Paul Andrew Spudich Fund](https://www.seismosoc.org/support-ssa/paul-andrew-spudich-fund/) - [civicrm component="contribution" id="44" action="transact" mode="live" hijack="0" civititle="hide"]
- [Kanamori Fund Donations Annual Meeting](https://www.seismosoc.org/kanamori-am/) - [civicrm component="contribution" id="38" action="transact" mode="live" hijack="0" civititle="hide"]
- [Donate to the Kanamori Fund](https://www.seismosoc.org/inside/donate-to-the-kanamori-fund/) - With your donation, the Kanamori Fund provides professional development opportunities for students and seismologists of all ages and supports SSA's ability to quickly pursue new program ideas on behalf of the community. Named in honor of Hiroo Kanamori, the Kanamori Fund has made possible special workshops and helped support travel grants to SSA meetings from countries that
- [Global Travel Grants](https://www.seismosoc.org/grants-and-fellowship/global-travel-grant-2/)
- [Annual Meeting Travel Grants](https://www.seismosoc.org/grants-and-fellowship/annual-meeting-travel-grants/) - SSA recognizes the importance of students and student participation in the SSA Annual Meeting. Each year SSA provides student and international members with the opportunity to apply for several Society funded travel grants: The Student Travel Grant is available to SSA student members from inside or outside the USA who must travel more than 500 km (311
- [Support Seismology](https://www.seismosoc.org/membership/contribute/) - Your tax-deductible gift helps SSA in its mission to advance seismology worldwide The SSA General Fund Provides unrestricted support for the Society to apply donations where they are most needed The Kanamori Fund Honors Caltech Professor Emeritus Hiroo Kanamori by supporting the professional development of mentors The Annual Meeting Travel Grant Fund Provides students and
- [Author Name Change Policy and Procedures](https://www.seismosoc.org/publications/author-name-change-policy-and-procedures/) - There are many reasons why journal authors may change names during their publishing careers, including but not limited to marriage or divorce, gender identity, or religious conversion. SSA supports such changes as well as our authors’ privacy in such matters. Authors are not required to disclose the reason or provide documentation for a name change
- [Preprint Policy](https://www.seismosoc.org/publications/publishing-policies/preprint-policy/) - SSA will consider for publication research posted on not-for-profit preprint servers so long as the author retains copyright in their work and have not assigned a Creative Commons license when posting to a preprint server. Submissions that have been assigned a Creative Commons license or the copyright has been transferred to a 3rd party will
- [Statement on the National Volcano Early Warning System (NVEWS)](https://www.seismosoc.org/us-government-relations/national-volcano-early-warning-system/) - The Seismological Society of America supports the National Volcano Early Warning System (NVEWS) and urges Congress to reauthorize and fully fund this program. The United States has over 160 active or recently active volcanoes, including 18 categorized as very high threat and 39 as high threat by the U.S. Geological Survey. These hazards pose a
- [SSA-AGU Update Position on Comprehensive Nuclear-Test Ban Treaty](https://www.seismosoc.org/us-government-relations/ssa-agu-joint-statement-expand-sustain-ctbt-june-2017/) - SSA-AGU: The Capability to Monitor the Comprehensive Nuclear-Test-Ban Treaty (CTBT) Should be Expanded, Completed, and Sustained The global network of monitoring stations mandated by the CTBT meets international goals for treaty verification and enforcement, and contributes to national security, as well as to mitigation of earthquake and other natural hazards. In September 1996, the United
- [Future Directions: Physics-based ground motion modeling](https://www.seismosoc.org/groundmotion/)
- [Publishing Ethics Guidelines](https://www.seismosoc.org/inside/publishing-ethics-guidelines/) - Publishing Ethics Guidelines SSA is committed to upholding the integrity of the work published in Bulletin of the Seismological Society of America (BSSA), Seismological Research Letters (SRL) and The Seismic Record (TSR). Scientific research, and the preparation of the results, must be free of any impropriety or undisclosed conflicts of interest. Intentional plagiarism, fabrication, or
- [Reviewer Information](https://www.seismosoc.org/publications/srl/reviewer-information/) - BSSA, SRL and TSR Reviewer Guidelines Thank you for agreeing to review a paper for BSSA, SRL or TSR. The quality and timeliness of the journals rely on the volunteer efforts of referees, and these efforts are greatly appreciated. Our community depends on your thorough feedback to authors so that published research is the highest quality possible. Conflict of
- [Reviewer Information](https://www.seismosoc.org/publications/the-seismic-record/reviewer-information/) - BSSA, SRL and TSR Reviewer Guidelines Thank you for agreeing to review a paper for BSSA, SRL or TSR. The quality and timeliness of the journals rely on the volunteer efforts of referees, and these efforts are greatly appreciated. Our community depends on your thorough feedback to authors so that published research is the highest quality possible. The first
- [Ethics Committee Charter](https://www.seismosoc.org/inside/ethics-committee-charter/) - The Ethics Committee reports to the Board of Directors (Board) and is responsible for assisting the Board in upholding SSA’s commitment to the highest ethical professional standards. The Ethics Committee is not a standing committee and will meet only as needed. Ethics Committee members will act in good faith and exercise honest judgment, free from
- [SSA Meeting Highlights](https://www.seismosoc.org/meetings/ssa-meeting-highlights/)
- [Professional Ethics Policy](https://www.seismosoc.org/inside/professional-ethics-policy/) - Professional Ethics Policy[1] A. Introduction & Purpose The mission of the Seismological Society of America (SSA) is to advance seismology and the understanding of earthquakes for the benefit of society. To achieve this mission, SSA expects its members and those who participate in SSA-sponsored programs to adhere to the highest standards of scientific integrity, personal accountability,
- [ETHICS DISCLOSURE FORM FOR NOMINATORS - Honors & Awards](https://www.seismosoc.org/inside/ethics-disclosure-form-for-nominators/)
- [ETHICS DISCLOSURE FORM FOR NOMINATORS SSA Leadership Positions](https://www.seismosoc.org/inside/ethics-disclosure-form-for-nominators-ssa-leadership-positions/)
- [grants](https://www.seismosoc.org/grants/)
- [Rules and Outliers in Seismology–Implications for Hazard Mitigation Strategy](https://www.seismosoc.org/meetings/rules-and-outliers-in-seismology-implications-for-hazard-mitigation-strategy-with-hiroo-kanamori/) - https://youtu.be/1OtwcY7-Y8U Presented by Hiroo Kanamori, California Institute of Technology Introduced and moderated by James Mori, Kyoto University Discussant: Annemarie Baltay, U.S. Geological Survey To deal with the complex and unpredictable earthquake behavior, seismologists strive for finding rules and outliers in seismology. The difficulty in performing in situ experiments in seismology necessitates detailed studies of individual
- [Opening Keynote: What Have We Learned About the Earth’s Interior from Seismology in the Last 40 Years?](https://www.seismosoc.org/meetings/opening-keynote-recording/) - Presented by Barbara Romanowicz, University of California, Berkeley Introduced by SSA President John Townend, Victoria University of Wellington Moderated by Jeroen Ritsema, University of Michigan and editor-at-large of The Seismic Record Building upon theoretical foundations laid in the 1970s and owing to the large quantity of high quality digital seismological data accumulating since the early
- [Effective Earthquake Communication](https://www.seismosoc.org/meetings/effective-earthquake-communication/) - Presented by Xyoli Pérez-Campos, Instituto de Geofísica, Universidad Nacional Autónoma de México Introduced and moderated by Sergio Barrientos, University of Chile Discussant: Marino Protti, University of Costa Rica A growing concern across countries is how scientific knowledge is disregarded by those making official policy as well as the general public. Therefore, effective science communication is
- [AE Survey](https://www.seismosoc.org/publications/ae-survey/)
- [Account Registration](https://www.seismosoc.org/account-registration/)
- [Join & Give](https://www.seismosoc.org/join-give/)
- [](https://www.seismosoc.org/inside/objectives-continuing_directors/) - Continuing Directors Terms Expire 2022 Terms Expire 2023 Heather DeShon Southern Methodist University Dallas, TX Annemarie Baltay U.S. Geological Survey Menlo Park, California Kuo-Fong Ma National Central University Taoyuan City, Taiwan Susan Bilek New Mexico
- [Thank you for paying by check!](https://www.seismosoc.org/membership/thank-you-pay-by-check/) - Thank you for submitting your membership application! Your membership status is currently pending. To complete your membership, please send payment to: Seismological Society of America 400 Evelyn Avenue Suite 201 Albany, California 94706 United States Once we receive payment, your membership status will be marked as completed, and you will be able to access your membership
- [Eastern Section SSA Student Travel Grants](https://www.seismosoc.org/inside-eastern-section/es-ssa-student-travel-grants/) - Travel grants for students submitting abstracts will be available on a competitive basis. Applications for the 2020 Eastern Section Annual Meeting will be open in 2020. Please check back then!
- [BSSA Call for Papers](https://www.seismosoc.org/bssa-call-for-papers/) - BSSA Call for Papers: Special Issue on the 2019 Ridgecrest, California, Earthquake Sequence The Bulletin of the Seismological Society of America (BSSA) is soliciting papers for a Special Issue on the 2019 Ridgecrest, California, Earthquake Sequence. The Ridgecrest, California, Earthquake Sequence included a M6.4 foreshock on July 4, followed 34 hours later by a M7.1
- [Update your profile](https://www.seismosoc.org/update-your-profile/)
- [Update Member profile](https://www.seismosoc.org/members/update-member-profile/)
- [Member Resources](https://www.seismosoc.org/member-resources/) - Members Only Resources: Membership Roster Search SSA's online membership roster. Annual Meeting Presentations 5 June 2017 – Video slidecasts and posters from the 2017 Annual Meeting are now available. Manage Your Membership: Make a Contribution! Our ability to advance seismology depends on your support. View Transactions and Event Registrations Print copies of your receipts
- [Renew Your Membership](https://www.seismosoc.org/members/renew-leadership/) - Choose your Membership LevelRegular Membership - $100 Please click here to renew your membership. As a full regular member, you may receive SRL in print ($40 within the US / $60 outside the US) and BSSA in print ($75 within the US / $105 outside the US).You may qualify for other membership options:Reduced Rate Options: Student Membership ($25)
- [Membership Roster Search](https://www.seismosoc.org/members/roster-search/) - [civicrm component="profile" gid="17" mode="search" hijack="0"]
- [Membership Roster Search](https://www.seismosoc.org/members/membership-roster-search/) - [civicrm component="profile" gid="17" mode="search" hijack="0"]
- [Change password](https://www.seismosoc.org/change-password/)
- [2005 Annual Meeting Board of Directors Meeting Minutes](https://www.seismosoc.org/members/board/2005-annual-meeting-board-directors-meeting-minutes/) - The Seismological Society of AmericaApril 26, 2005Martis Peak Room, Hyatt Regency Lake Tahoe Incline Village, NevadaThe 2004-05 Board of Directors of the Seismological Society of America met in the Martis Peak Room of the Hyatt Regency Lake Tahoe in Incline Village, Nevada. President Steve Malone called the meeting to order at 9:30 AM. Present at
- [Strategic Plan](https://www.seismosoc.org/members/board/strategic-plan/) - Approved 4/04 Background: Over the course of several years, SSA evaluated its areas of strength, weakness, threats and opportunities, in an effort to better serve our membership, and to keep our society strong and relevant. Input to this process from our member survey in 2001 was valuable in developing new initiatives for the Society,
- [SSA BOARD POLICY MANUAL](https://www.seismosoc.org/members/board/ssa-board-policy-manual/) - April 2005 (Revision 5)Table of Contents1. Introduction2. Allied Societies3. Annual Meetings4. Directors, Officers, and Executive Committee5. Chapters/Sections6. Committees and Committee Functions7. Contract Signing Authority8. Finance and Accounting9. Human Resources10. Legal Counsel11. Letterhead12. Medal of the Seismological Society of America13. Minutes of Meetings14. Membership Categories, Dues, Benefits, and Privileges15. Press Relations16. Publications17. Amendment of the Policy
- [SSA BOARD POLICY MANUAL APPENDIX A](https://www.seismosoc.org/members/board/ssa-board-policy-manual-appendix/) - November 30, 2001 (Revision 3)The Officers Nominating Committee in 1999 tried to run the nomination procedure in a way that identified the nominee for each office who had the most support on the Board. Independence of judgment as Nominating Committee members was confined to developing a procedure that was beneficial to the Society, fair to
- [2005  Annual Meeting Luncheon Business Meeting Minutes](https://www.seismosoc.org/members/board/2005-annual-meeting-luncheon-business-meeting-minutes/) - April 28, 2005The 100th Annual Meeting of the Seismological Society of America was held April 27-29 at the Hyatt Regency Lake Tahoe, Incline Village, Nevada.The Annual Business Meeting was held at a luncheon on April 28. Approximately 193 people attended. President, Steve Malone welcomed members to the meeting. He introduced the officers, directors and guests
- [2004 Annual Meeting Board of Directors Meeting Minutes](https://www.seismosoc.org/members/board/2004-annual-meeting-board-directors-meeting-minutes/) - Minutes of the Meeting of theBoard of Directors ofThe Seismological Society of America VIP Room, Riviera ResortPalm Springs, California13 April 2004The 2003–2004 Board of Directors of the Seismological Society of America met in the VIP Room of the Riviera Resort, Palm Springs, California. President Steve Malone called the meeting to order at 9:45 am . Present
- [2004 Annual Meeting Luncheon Business Meeting Minutes](https://www.seismosoc.org/members/board/2004-annual-meeting-luncheon-business-meeting-minutes/) - 15 April 2004The Annual Meeting of the Seismological Society of America was held 14–16 April at the Riviera Resort, Palm Springs, California.The Annual Business Meeting was held at a luncheon on 15 April. Approximately 155 people attended. President Steve Malone welcomed members to the meeting. He introduced the officers, directors, and guests seated at the
- [2003 Annual Meeting Board of Directors Meeting Minutes](https://www.seismosoc.org/members/board/2003-annual-meeting-board-directors-meeting-minutes/) - 29 April 2003Minutes of the Meeting of the Board of Directors of the Seismological Society of AmericaGalleria Room, Caribe Hilton HotelSan Juan, Puerto RicoThe 2002-03 Board of Directors of the Seismological Society of America met in the Galleria Room of the Caribe Hilton, San Juan, Puerto Rico. President Gail M. Atkinson called the meeting to
- [2002  Annual Meeting Luncheon Business Meeting Minutes](https://www.seismosoc.org/members/board/2002-annual-meeting-luncheon-business-meeting-minutes/) - 18 April 2002The Annual Meeting of the Seismological Society of America was held 17-19 April at the Victoria Conference Centre in Victoria, British Columbia, Canada.The Annual Business Meeting was held at a luncheon on 18 April. Approximately 150 people attended. President Gail Atkinson welcomed members to Canada and to the meeting. She introduced the officers,
- [2002 Annual Meeting Board of Directors Meeting Minutes](https://www.seismosoc.org/members/board/2002-annual-meeting-board-directors-meeting-minutes/) - 16 April 2002Minutes of the Meeting of the Board of Directors of the Seismological Society of AmericaBoardroom, Chateau Victoria HotelVictoria, British Columbia, CanadaThe 2001-2002 Board of Directors of the Seismological Society of America met in the Board Room of the Chateau Victoria Hotel in Victoria, BC, Canada. President Gail M. Atkinson called the meeting to
- [2001 Annual Meeting Board of Directors Meeting Minutes](https://www.seismosoc.org/members/board/2001-annual-meeting-board-directors-meeting-minutes/) - 19 April 2001The 96th Annual Meeting of the Seismological Society of America was held 18-20 April at the Cathedral Hill Hotel in San Francisco, California.The Annual Business Meeting was held at a luncheon on 19 April. Approximately 177 people attended. Outgoing President Terry Wallace welcomed members to San Francisco. He introduced the officers, directors, and
- [Grants](https://www.seismosoc.org/awards/grants/) - SSA offers grants to help students and international members attend Annual Meetings, workshops, small domestic scientific meetings or international scientific meetings. Annual Meeting Travel Grants SSA recognizes the importance of students and student participation in the SSA Annual Meeting. Each year SSA provides student and international members with the opportunity to apply for the Student
- [Bylaws of the Eastern Section](https://www.seismosoc.org/inside-eastern-section/bylaws-eastern-section/) - BYLAWS of Eastern Section Seismological Society of America ARTICLE I Name, Principal Office, Purpose, and Restrictions 1.01 Name. The name of the association is Eastern Section Seismological Society of America, a California nonprofit public benefit corporation ("Eastern Section SSA"). 1.02 Principal Office. The Board of Directors ("Board") shall determine the location of the principal office of the
- [Strategic Plan](https://www.seismosoc.org/inside/strategic-plan/) - 10-30 Year Planning Horizon Core Ideology and Envisioned Future Core ideology describes an organization’s consistent identity that transcends all changes related to its relevant environment. Core ideology consists of two parts: core purpose – the organization’s reason for being – and core values – essential and enduring principles that guide an organization. Core Purpose of
- [Education](https://www.seismosoc.org/inside/education/) - Here are some sources of information on teaching about earthquakes and earth sciences and about careers in seismology. EduQuakes The EduQuakes column debuted in the July/August 1998 issue of Seismological Research Letters and is a flexible and diverse forum for issues and information relating to SSA's ongoing educational mission. IRIS-SSA Distinguished Lectureship The Incorporated Research Institutions for
- [Actions for Managing Earthquake Risk](https://www.seismosoc.org/us-government-relations/actions-managing-earthquake-risk/) - The Seismological Society of America, the Earthquake Engineering Research Institute, and Disaster Resistant California endorsed this statement as part of the 100th Anniversary Earthquake Conference in San Francisco in 2006. Actions for Mitigating Risk: Earthquake Professionals’ Top Ten Actions for Northern California The people, businesses and government agencies in Northern California risk suffering life, structural
- [BSSA Classification Terms](https://www.seismosoc.org/publications/bssa/bssa-classification-terms/) - NUMBER DESCRIPTION 1.000 Seismic Arrays, Networks, and Instrumentation 2.000 Intensity Measures and Scales 3.000 Signal Processing 4.000 Inverse Theory 5.000 Geology 6.000 Paleoseismology and Archeoseismology 7.000 Geodesy and Deformation 8.000 Rock Mechanics 9.000 Heat Flow 10.000 Potential Fields 11.000 Wave Propagation 12.000 Earth Structure 12.100 Faults 12.200 Upper crust 12.300 Lithosphere 12.400 Mantle 12.500 Core
- [Ben Howell's History of SSA](https://www.seismosoc.org/inside/history/howell_history/) - History of the Seismological Society of America by B.F. Howell, Jr. The Pennsylvania State University This article originally appeared in Seismological Research Letters (Vol. 73, No. 1, January/February 2002). Formation The Townley Years (1911-1929) Sections The Byerly Years (1930-1956) The Great Expansion (1957-1975) The Modern Era (1975-2000) Acknowledgments Formation Aftershocks of the 18 April earthquake were still
- [Capability to Monitor the Comprehensive  Nuclear-Test-Ban Treaty](https://www.seismosoc.org/us-government-relations/capability-monitor-comprehensive-nuclear-test-ban-treaty/) - The Seismological Society of America and the American Geophysical Union first issued a joint position statement on the seismic verification of the Comprehensive Nuclear Test-Ban Treaty (CTBT) in 1999. In late 2007 both organizations reviewed, updated and reaffirmed the statement. The Geological Society of America endorsed this position statement in October 2009 (see http://www.geosociety.org/positions/pos14_NuclearTesting.pdf). Capability to
- [News](https://www.seismosoc.org/newsroom/)
- [SRL Article Types](https://www.seismosoc.org/publications/srl-authorsinfo-2/srl-article-types/) - SRL publishes articles, columns, news, and other items of broad appeal to seismologists and earthquake engineers. Those with asterisks (*) are exempt from page charges. Articles (aka "regular SRL articles) comprise the bulk of SRL submissions. They are informational, timely, and appeal to a cross section interests within and tangental to the field of seismology.
- [CiviCRM](https://www.seismosoc.org/civicrm/) - Do not delete this page. Page content is generated by CiviCRM.
- [Donate to SSA](https://www.seismosoc.org/give/) - [civicrm component="contribution" id="1" mode="live" hijack="1"]
- [The Jesuit Contribution to Seismology](https://www.seismosoc.org/inside/eastern-section/jesuit-contribution-seismology/) - The Jesuit Contribution to Seismology by Agustin Udías, Universidad Complutense, Madrid, Spain and William Stauder, Saint Louis University (from Seismological Research Letters, Vol. 67, No. 3, pp. 10-19; May/June 1996) INTRODUCTION The contribution to seismology of the Society of Jesus as an institution through its colleges and universities, and its members as individual scientists, forms an
- [Job Alert Mailing List](https://www.seismosoc.org/jobs/alerts/) - Sign up to receive an email alert when new jobs are posted.
- [Earthquake Sounds](https://www.seismosoc.org/inside/earthquake_sounds/) - Catalog of Earthquake-Related SoundsCompiled by Karl V. SteinbruggeThis collection of 21 earthquake-related sounds, prepared by Karl V. Steinbrugge, was originally published in BSSA vol. 64, no. 5 in 1974 and updated with eight additional sounds in 1985. The collection was sold by the Society for many years, first as an audio cassette tape and later
- [Participate in the 2017 Election for the SSA Board of Directors](https://www.seismosoc.org/vote_ssa/) - SSA members are invited to vote for members of the Board of Directors in the 2017 election! Please select an option below to participate: Tables of Contents for past BSSA issues, including links to Electronic Supplements, are available on the SSA web site. You can also access the Tables of Contents along with abstracts and
- [Moments in SSA History](https://www.seismosoc.org/inside/history/moments/) - President Herbert Hoover From Seismological Research Letters Vol. 70, No. 1, p. 9; January-February 1999 It would probably surprise most SSA members today to learn that an early member of the Society went on to become President of the United States. The following excerpts from the minutes of early Board of Directors meetings document some of
- [Job Listings](https://www.seismosoc.org/jobs/job-listings/)
- [Update Your Membership for Next Year](https://www.seismosoc.org/members/renew-elife/) - Life Membership - Update your profile! As a life member, you do not pay annual membership dues. It is important to keep your information current, and we invite you to review your membership information and select your journal options for the upcoming year. For an additional fee, you may receive BSSA in print ($75 in the US,
- [Update Your Membership](https://www.seismosoc.org/members/renew-life/) - Life Membership - Please update your profile! Thank you for being a life member! As a life member, you do not pay annual membership dues. We invite you to review your membership information and select your journal options for the upcoming year. By filling out the form, you also have the opportunity to join affiliated organizations, contribute
- [Update Your Membership for Next Year](https://www.seismosoc.org/members/renew-honorary/) - Honorary Membership Please update your profile! As an honorary member, you do not pay annual membership dues. Please do complete the membership form to verify that your contact information is correct and to select journal options for the upcoming year. As you complete the form, please consider giving to one of SSA's funds that support the Society's
- [Renew Your Membership](https://www.seismosoc.org/members/renew-developing-country/) - Choose your Membership LevelDeveloping Country Membership - $45 Please click here to renew your membership. To keep your “Developing Country” discounted rate, you must reside in a country not listed as “high income” by the World Bank. No print journals are available with this membership type.Other membership options:Student Membership ($25) – If you are a student
- [Renew Your Membership](https://www.seismosoc.org/members/renew-transitional/) - Choose your Membership LevelTransitional Membership - $45 Please click here to renew your membership. You may choose to receive SRL in print for an additional fee ($40 within the US / $60 outside the US). BSSA online is only available with this membership type.To receive BSSA in print, please join as a regular member or a life
- [Renew Your Membership](https://www.seismosoc.org/members/renew-affiliate/) - Choose your Membership LevelAffiliate Membership - $65 You must renew your affiliate membership through EERI as part of your EERI membership process. Affiliate members receive only online access to SRL. To gain access to BSSA and voting privileges, please join SSA as a regular member. As a full member, you may also opt to receive BSSA in
- [Renew Your Membership](https://www.seismosoc.org/members/renew-regular/) - Choose your Membership LevelRegular Membership - $100 Please click here to renew your membership. As a full regular member, you may receive SRL in print ($40 within the US / $60 outside the US) and BSSA in print ($75 within the US / $105 outside the US).You may qualify for other membership options:Reduced Rate Options: Student Membership ($25)

## Jobs

- [Geophysical Data Processing Team Lead](https://www.seismosoc.org/job/uc-berkeley-seismology-lab-berkeley-ca-149-geophysical-data-processing-team-lead/) - Departmental Overview The Berkeley Seismological Laboratory (BSL) conducts essential research on earthquakes and solid earth processes while collecting and delivering high quality geophysical data. It provides robust earthquake and hazard information including real-time alerts to the public, in collaboration with our partners. It also enables the broad consumption of earthquake information by everyone while educating
- [Civil (Earthquake) Engineer position at the U.S. Geological Survey (USGS) Earthquake Science Center (ESC)](https://www.seismosoc.org/job/u-s-geological-survey-149-civil-earthquake-engineer-position-at-the-u-s-geological-survey-usgs-earthquake-science-center-esc/) - The U.S. Geological Survey Earthquake Science Center (ESC) is hiring a Civil Engineer for its National Strong Motion Project (NSMP). The NSMP has the primary Federal responsibility for acquiring strong motion records of significant earthquakes in the United States recorded by sensors placed in man-made structures. This permanent position is offered at the GS-13 level in Moffett
- [Geophysical Data Acquisition & Quality Team Lead at the Berkeley Seismology Lab](https://www.seismosoc.org/job/uc-berkeley-seismology-lab-berkeley-ca-149-geophysical-data-acquisition-quality-team-lead-at-the-berkeley-seismology-lab/) - The Berkeley Seismology Lab operates a large network of seismic and geodetic stations as well as DAS systems across northern California. These stations/systems stream data in real time to our data center on Campus, where data is processed, analyzed and archived for the purposes of earthquake monitoring, earthquake early warning and scientific research. The BSL
- [Geophysical Software Engineer at the Berkeley Seismology Lab](https://www.seismosoc.org/job/uc-berkeley-seismology-lab-berkeley-ca-149-geophysical-software-engineer-at-the-berkeley-seismology-lab/) - The Berkeley Seismology Lab operates a large network of seismic and geodetic stations as well as DAS systems across northern California. These stations/systems stream data in real time to our data center on Campus, where data is processed, analyzed and archived for the purposes of earthquake monitoring, earthquake early warning and scientific research. The BSL
- [Field Engineer](https://www.seismosoc.org/job/alaska-earthquake-center-fairbanks-alaska-149-field-engineer-2/) - The Alaska Earthquake Center is hiring a Field Engineer to join the efforts of our team and contribute to our mission of strengthening Alaska’s resilience to earthquakes and tsunamis through monitoring, research and public engagement. We seek an individual with the ability to manage a team of a half dozen staff with diverse skills who
- [SENIOR PRECISION ELECTRONICS SPECIALIST](https://www.seismosoc.org/job/california-geological-survey-sacramento-149-senior-precision-electronics-specialist/) - The California Geological Survey Seismic Hazards Program is hiring a Senior Precision Electronics Specialist. Under the general direction of the Field Operations Manager, the Senior Precision Electronics Specialist is responsible for planning, organizing, and directing the work of a group of technicians in the installation, organization and maintenance of earthquake accelerometers and seismic recording equipment

## Events

- [2020 SSA Annual Meeting](https://www.seismosoc.org/events/event/2020-ssa-annual-meeting/) - 2020 Annual Meeting Program Co-Chairs Rick Aster, Colorado State University Brandon Schmandt, University of New Mexico For questions about the annual meeting, please write abstracts@seismosoc.org.
- [How to Present Your Work and Communicate Effectively](https://www.seismosoc.org/events/event/how-to-present-your-work-and-communicate-effectively/) - How to Present Your Work and Communicate Effectively Tuesday, 21 March, 11 a.m-12 p.m. Pacific Mentors will share their advice on how to present and engage with an audience. This session is recommended for members that are presenting at the 2023 SSA Annual Meeting. Registration closed.
- [How to Network at Meetings](https://www.seismosoc.org/events/event/how-to-network-at-meetings/) - How to Network at Meetings Wednesday, 1 March, Noon-1 p.m. Pacific Mentors: Rich Briggs, U.S. Geological Survey Joan Gomberg, U.S. Geological Survey Mouse Reusch, Pacific Northwest Seismic Network David Wald, U.S. Geological Survey Andrew Michael, U.S. Geological Survey Fellow SSA members will answer questions about how to make new connections and approach future collaborators at
- [Ask a Mentor: General Advice for SSA Members](https://www.seismosoc.org/events/event/ask-a-mentor-general-advice-for-ssa-members/) - Ask a Mentor: General Advice for SSA Members Wednesday, 1 February, noon-1 p.m. Pacific Ask questions and receive advice from a panel of mentors who will share their wisdom with you during both small and large group discussions. Registration closed.
- [Preparing for the 2023 Annual Meeting](https://www.seismosoc.org/events/event/preparing-for-the-2023-annual-meeting/) - Preparing for the 2023 Annual Meeting Wednesday, 21 February, 11 a.m-12 p.m. Pacific Mentors will lead large group and small group discussions on how to make the most of your Annual Meeting experience. First time meeting attendees and all SSA members are welcome! Register here.
- [Advancing the use of turbidite observations in understanding offshore tectonic processes and seismic hazards](https://www.seismosoc.org/events/event/advancing-the-use-of-turbidite-observations-in-understanding-offshore-tectonic-processes-and-seismic-hazards/) - Turbidites and subaqueous mass transport deposits (MTDs) are key components for understanding past earthquakes, providing important constraints on recurrence intervals, segmentation behavior, and often rupture dimensions and characteristics. In subduction zones, a premise of turbidite paleoseismology is that shaking from megathrust and other earthquakes remobilizes sediments that are transported downslope in densified currents that subsequently
- [COSMOS Technical Session 2022](https://www.seismosoc.org/events/event/cosmos-technical-session-2022/) - The 2022 COSMOS Technical Session is coming to UCLA on Friday, November 18th. The annual technical session provides a forum for seismologists, geologists, and engineers to come together and discuss issues related to the use of earth science data (including earthquake recordings) by the engineering community. This year's technical session includes talks on noninvasive site characterization
- [Academic Career Planning](https://www.seismosoc.org/events/event/36029/) - Academic Career Planning Tuesday, 18 October, 9-10 a.m. Pacific Mentors: Laurie Baise, Tufts University; Qingkai Kong, Lawrence Livermore National Laboratory; William Frank, Massachusetts Institute of Technology Need advice on pursuing an academic career? SSA members will share their experiences in academia and provide guidance to help plan your next steps. Register below. Back to SSA
- [Networking for Careers in Industry](https://www.seismosoc.org/events/event/networking-for-careers-in-industry/) - Networking for Careers in Industry Tuesday, 20 September, 9-10 a.m. Pacific Mentors: Delphine Fitzenz, RMS; Megan Flanagan, Air Force Research Laboratory; Will Levandowski, TetraTech Receive advice from fellow SSA members on networking for careers in industry. Mentors will share networking tips for success and answer questions to help you advance in your field. Register below.
- [Material Science and Engineering](https://www.seismosoc.org/events/event/material-science-and-engineering/) - It is a great pleasure and honour, as Conference Chairs and representatives of the hosting university to invite colleagues from academia and business, as well as young researchers and students from all parts of the world to attend the Material Science 2022. The conference, scheduled from August 08-09, 2022 is organized by Conference Series LTD in
- [SEG/SPE Injection Induced Seismicity Workshop: A Decade of Learnings](https://www.seismosoc.org/events/event/seg-spe-injection-induced-seismicity-workshop-a-decade-of-learnings/) - 7–9 June 2022 Austin, Texas, USA Workshop Objective The 6th workshop in the popular injection induced seismicity workshop series hosted by the Society of Exploration Geophysicists (SEG) and the Society of Petroleum Engineers (SPE) is scheduled for 7–9 June 2022 in Austin, Texas. Since the first workshop held in 2012, significant advancements have been made particularly in extensive seismic
- [Career Paths in Earthquake Science](https://www.seismosoc.org/events/event/career-paths/) - Receive advice on your career trajectory from our mentors, who cover a number of different career paths: Academia, Government and Non-traditional. Registration closes 4 April at Noon Pacific. Back to SSA Connects homepage.
- [Land Acknowledgement Statements](https://www.seismosoc.org/events/event/land-acknowledgement-statements/) - Workshop: Land Acknowledgment Statements Part A: Thursday, 10 March at 10-11:15 a.m. Pacific, Part B: Thursday, 17 March at 10-11:15 a.m. Pacific In this two-part workshop, attendees will learn about land acknowledgement statements and have the opportunity to write their own statement to include in upcoming abstracts or presentations. This workshop is recommended for all SSA members, including
- [Bystander Training](https://www.seismosoc.org/events/event/improving-workplace-climate-empowering-individuals-to-become-active-bystanders/) - Bystander Training: Empowering individuals to become active bystanders This interactive, ADVANCEGeo session describes academic practices and institutional structures that allow for sexual harassment, bullying and other hostile behaviors to persist, discusses initiatives to address harassment as research misconduct and provides training in personal intervention strategies to protect and support targets of harassment. As a result
- [AGU and CUAHSI Frontiers in Hydrology Meeting](https://www.seismosoc.org/events/event/agu-and-cuahsi-frontiers-in-hydrology-meeting/) - JM
- [Implicit Bias Training: PM](https://www.seismosoc.org/events/event/implicit-bias-training-pm/) - Implicit Biases: Why we have them and how they impact STEM Implicit biases are automatic, subconscious cognitive predispositions that silently impact our understanding, actions and decisions in a wide range of contexts. Left unexamined, these biases can impact our decision-making processes in ways that cause us to act against our own beliefs. For example, did
- [Implicit Bias Training: AM](https://www.seismosoc.org/events/event/implicit-biases-why-we-have-them-and-how-they-impact-stem/) - Implicit Biases: Why we have them and how they impact STEM Implicit biases are automatic, subconscious cognitive predispositions that silently impact our understanding, actions and decisions in a wide range of contexts. Left unexamined, these biases can impact our decision-making processes in ways that cause us to act against our own beliefs. For example, did
- [EGU	General Assembly](https://www.seismosoc.org/events/event/egugeneral-assembly/) - MH
- [SSA Seismic Tomography 2022](https://www.seismosoc.org/events/event/tomography/) - A new SSA meeting coming 28-30 October 2022 intended to serve as a platform to critically discuss what has been and what remains to be achieved in the field of seismic tomography. Co-Chairs: Andreas Fichtner (ETH Zürich) Clifford Thurber (University of Wisconsin-Madison) Questions? Email abstracts@seismosoc.org. or learn more here: seismosoc.org/tomography2020
- [SSA Annual Meeting 2023](https://www.seismosoc.org/events/event/ssa-annual-meeting-2023/)
- [Conversation with Congressional Staff on Reauthorizing NEHRP and NVEWS](https://www.seismosoc.org/events/event/conversation-with-congressional-staff-on-reauthorizing-nehrp-and-nvews/) - Join us for a conversation with Congressional staff on the plans for reauthorizing the National Earthquake Hazards Reduction Program (NEHRP) and the National Volcano Early Warning System (NVEWS). Our speakers will provide insight into the procedure of reauthorizing the legislation, what to expect in the coming Congress and how SSA members can positively impact the
- [Publishing Workshop](https://www.seismosoc.org/events/event/publishing-workshop/) - Publishing: How to Review and How to Be Reviewed Learn how to review a scientific paper and how to respond effectively to reviews of your own work. Registration for this events will open with Annual Meeting registration. Instructors: Allison Bent, editor-in-chief of SRL; John Ebel, Boston College; P. Martin Mai, editor-in-chief of BSSA
- [Intro to Machine Learning](https://www.seismosoc.org/events/event/introduction-to-machine-learning/) - A hands-on look at how to use machine learning concepts in seismological research. Registration for this events will open with Annual Meeting registration. Instructors: Karianne Bergen, Brown University; Qingkai Kong, Lawrence Livermore National Laboratory; Youzuo Lin, Los Alamos National Laboratory
- [Machine Learning II](https://www.seismosoc.org/events/event/machine-learning-ii/) - Attendees with prior machine learning experience may register for this workshop, where instructors will demonstrate more advanced techniques. Registration for this events will open with Annual Meeting registration. Instructors: Karianne Bergen, Brown University; Qingkai Kong, Lawrence Livermore National Laboratory; Youzuo Lin, Los Alamos National Laboratory
- [Networking for Scientists](https://www.seismosoc.org/events/event/networking-for-scientists/) - Networking is built on a spirit of generosity. At its core, networking is all about crafting win-win alliances where both parties provide value. You may think that networking can only take place in person, but in fact, most networking takes place from afar. In this webinar, we will discuss strategies and tactics for finding new
- [Virtual Interviewing](https://www.seismosoc.org/events/event/virtual-interviewing/) - Virtual Interviewing: Champion Yourself Through Storytelling Interviewing is about demonstrating how your experience, skills and enthusiasm are aligned with the employer’s needs. To show decision makers that you can add value and move their agenda forward, you want to build verbal bridges. This takes place in the form of stories. In this webinar, we will
- [How to Apply for Jobs](https://www.seismosoc.org/events/event/how-to-apply-for-jobs/) - How to Apply for Jobs with Alaina Levine Tuesday, 24 May at 9 a.m. Pacific This webinar will focus on all of the different components of a successful job application, including the application itself (when there is one), cover letter, resume/CV, and statements needed for academic positions such as the research, teaching and DEI statements.
- [Grow a Career over the Long-term](https://www.seismosoc.org/events/event/how-to-grow-a-career-over-the-long-term/) - Whether you are at the beginning of your career or have been in the workforce for a while, this session will give you the tools to build a healthy and successful career. Registration closes 17 May at Noon Pacific. Back to SSA Connects homepage.
- [Proposal and Grant Writing](https://www.seismosoc.org/events/event/34421/) - Writing effective proposals is key to advancement and the funding of your research. Bring your questions to our panel of successful grant and proposal writers. Registration closes 13 June at Noon Pacific. Back to SSA Connects homepage.
- [Advice from Early-career Mentors](https://www.seismosoc.org/events/event/advice-from-early-career-mentors/) - Advice from Early-career Mentors Tuesday, 15 February, 3 p.m. Pacific Get advice from scientists who have recent experience navigating life and a career after grad school. Back to SSA Connects homepage.
- [37th General Assembly of the European Seismological Commission](https://www.seismosoc.org/events/event/37th-general-assembly-of-the-european-seismological-commission/) - The 37th General Assembly of the ESC will be held in Corfu, Greece in September 2021. Please check their website for further information.
- [10th Congress of Balkan Geophysical Society](https://www.seismosoc.org/events/event/10th-congress-of-balkan-geophysical-society/) - The Balkan Geophysical Society (BGS) is honored to welcome you to attend the 10th Balkan Geophysical Congress and Exhibition which will be held on 18-22 September 2019 in Albena Resort, Bulgaria. The 10th Congress of BGS will traditionally provide excellent opportunities to attend valuable sessions, participate in interesting oral and poster presentations, visit an attractive
- [Earthquakes and tsunamis in Iberia: 50th years of the 1969 Saint Vincent earthquake (M=8.0)](https://www.seismosoc.org/events/event/earthquakes-and-tsunamis-in-iberia-50th-years-of-the-1969-saint-vincent-earthquake-m8-0/) - Objectives On 28 February 1969 a large earthquake, located at the zone where the catastrophic 1755 Lisbon shock occurred, stroke the Iberian Peninsula and northern Morocco with important damage and casualties. The shock, located at SW of Saint Vincent Cape, was followed by a tsunami that affected the SW of the Iberian Peninsula and Atlantic
- [Site Characterization in the Cascadia Region](https://www.seismosoc.org/events/event/site-characterization-in-the-cascadia-region/) - This 1-day workshop shares perspectives and approaches on characterizing site amplification effects in the Cascadia region - an important topic for seismic hazard assessment and engineering.
- [27th International Union of Geodesy and Geophysics General Assembly](https://www.seismosoc.org/events/event/27th-international-union-of-geodesy-and-geophysics-general-assembly/)
- [European Geosciences Union General Assembly 2019](https://www.seismosoc.org/events/event/european-geosciences-union-general-assembly-2019/)
- [6th World Conference on Climate Change](https://www.seismosoc.org/events/event/6th-world-conference-on-climate-change/) - Every year, globally Climate Change Ltd organizes series of Climate Change Conferences. On behalf of Climate Change Conference we would like to have your presence for the Climate Change Conference 2019 conference which is going to be held on September 09-11, 2019|Berlin Germany.. The theme of the conference is “An insider’s view of climate
- [26th World Congress on Chemistry](https://www.seismosoc.org/events/event/26th-world-congress-on-chemistry/) - Chemistry Conferences: Conferences Series welcomes professional chemists, Bioscience experience researchers, professors, scientific communities, delegates, students, business professionals and executives from all over the globe to attend the 26th World Congress on Chemistry that is to be command during October 30-31, 2019 London, UK which incorporates prompt keynote presentations, oral talks, poster displays and exhibitions. Chemistry 2019 is an international
- [2018 M7.1 Anchorage Earthquake Symposium](https://www.seismosoc.org/events/event/2018-m7-1-anchorage-earthquake-symposium/) - Join the Earthquake Engineering Research Institute and the Alaska Earthquake Center September 24-26 in Anchorage for a special symposium on the 2018 M7.1 Anchorage Earthquake. The Nov. 30, 2018, M7.1 Anchorage Earthquake in Southcentral Alaska was the most impactful earthquake in the U.S. in many years, presenting a major learning opportunity for the U.S. earthquake
- [2019 California Strong Motion Instrumentation Program's Annual Seminar](https://www.seismosoc.org/events/event/2019-california-strong-motion-instrumentation-programs-annual-seminar/) - The California Strong Motion Instrumentation Program (CSMIP) in the California Geological Survey (CGS) of the California Department of Conservation established a Data Interpretation Project in 1989. Each year CSMIP funds several data interpretation projects for the analysis and utilization of strong-motion data. The objectives of the Data Interpretation Project are to further the understanding of
- [American Geophysical Union Fall Meeting](https://www.seismosoc.org/events/event/american-geophysical-union-fall-meeting-2/)
- [36th General Assembly of the European Seismological Commission](https://www.seismosoc.org/events/event/36th-general-assembly-of-the-european-seismological-commission/)
- [16th European Conference on Earthquake Engineering](https://www.seismosoc.org/events/event/16th-european-conference-on-earthquake-engineering/)
- [European Geosciences Union General Assembly 2018](https://www.seismosoc.org/events/event/european-geosciences-union-general-assembly-2018/)
- [American Geophysical Union Fall Meeting](https://www.seismosoc.org/events/event/american-geophysical-union-fall-meeting-3/)
- [Russian Academy of Sciences 6th Scientific Biennial Conference “Problems of Complex Geophysical Monitoring of the Russian Far East”](https://www.seismosoc.org/events/event/russian-academy-of-sciences-6th-scientific-biennial-conference-problems-of-complex-geophysical-monitoring-of-the-russian-far-east/)
- [Eastern Section SSA 2018 Annual Meeting](https://www.seismosoc.org/events/event/eastern-section-ssa-2018-annual-meeting/) - The 2018 Eastern Section Meeting will be a joint meeting with the Canadian Geophysical Union (CGU), Canadian Soil Science Society (CSSS), Computational Infrastructure in Geodynamics (CIG), Eastern Section of the Seismological Society of America (ES-SSA) and the Canadian Society for Agricultural and Forest Meteorology (CSAFM). The meeting will take place during June 10 – 14, 2018 in Ontario, Canada.
- [Free webinar: Magna, Utah Earthquake Reconnaissance Briefing](https://www.seismosoc.org/events/event/free-webinar-magna-utah-earthquake-reconnaissance-briefing/) - Thursday, July 23, 11 am PT / 2 pm ET | REGISTER HERE The Earthquake Engineering Research Institute's Learning from Earthquakes program presents a free webinar highlighting impacts from the M5.7 March 18, 2020 Magna, Utah earthquake. In this multidisciplinary panel, you'll gain insights covering science, engineering, and response aspects of the earthquake. You will also
- [SMIP20 Seminar](https://www.seismosoc.org/events/event/smip20-seminar/) - SMIP20 Seminar on October 22, 2020 Registration is Now Open! Given the current situation with the coronavirus pandemic, CSMIP will hold the SMIP20 Seminar virtually on Thursday, October 22, 2020. The seminar program and online registration form are available at the SMIP20 Seminar website. ------------------------------------------------------------------------------------------------------------------------------------------ SMIP20 Seminar on Utilization of Strong-Motion
- [AEG 2020 Annual Meeting](https://www.seismosoc.org/events/event/aeg-2020-annual-meeting/) - Association of Environmental & Engineering Geologists 2020 Annual Meeting "Hazards in Hindsight...Lessons for the Future" Portland, Oregon September 15-20, 2020 Join us for the 63rd AEG Annual Meeting in Portland, Oregon! The 2020 meeting will feature an opening general session on Wednesday, three full days of technical sessions and symposia, educational Field Courses, fun Guest Tours and exciting special events. To register, submit
- [2nd Edition of World Congress on Geology & Earth Science](https://www.seismosoc.org/events/event/2nd-edition-of-world-congress-on-geology-earth-science/) - After the success of Geoscience-2019 conference held in London, Innovinc International proudly announcing the “2nd Edition of World Congress on Geology & Earth Science”(GeoEarth-2020) which will be held in Osaka, Japan from July 9-11, 2020. GeoEarth-2020 welcomes colleagues from all branches of Geosciences and from many countries in the world to disseminate their valuable work.
- [Materials Science and Nanotechnology](https://www.seismosoc.org/events/event/materials-science-and-nanotechnology/) - European Material 2020 organizing committee invites all participants across the globe to attend the 24th European Meeting on Materials Science and Nanotechnology which is to be held in March 14th -15th, 2020 in Rome, Italy which includes prompt Keynote Presentations, Oral Talks, Poster Competitions, and Exhibitions.
- [2020 National Earthquake Conference](https://www.seismosoc.org/events/event/2020-national-earthquake-conference/) - Register now to take advantage of early bird savings for the 2020 National Earthquake Conference (NEC) March 4-6 in San Diego, CA. The Earthquake Engineering Research Institute's Annual Meeting is happening in conjunction with the NEC. The dynamic agenda will feature the first public release of results from a new earthquake scenario and risk study for the
- [Frontiers in Renewable Energy and Environmental Engineering](https://www.seismosoc.org/events/event/frontiers-in-renewable-energy-and-environmental-engineering/) - Longdom Conferences proffers our immense pleasure and honour in extending you a warm invitation to attend Renewable Energy 2020. It is focusing on “Renewable Energy for a Sustainable Future” to enhance and explore knowledge among Energy Departments and to establish corporations and exchanging ideas. Providing the right stage to present stimulating Keynote talks, Plenary sessions,
- [LACSC 4th Regional Assembly 2020](https://www.seismosoc.org/events/event/lacsc-4th-regional-assembly-2020/)
- [Call for Papers: 12th National Conference on Earthquake Engineering (12NCEE)](https://www.seismosoc.org/events/event/call-for-papers-12th-national-conference-on-earthquake-engineering-12ncee/) - The Call for Papers for the 12th National Conference on Earthquake Engineering (12NCEE) is now open! Special session proposals are due September 10, and papers are due October 15. Please note that there will be no preliminary abstract submission and review for papers—the first and only submission will be a 4-page paper manuscript. NCEE is
- [American Geophysical Union Fall Meeting](https://www.seismosoc.org/events/event/american-geophysical-union-fall-meeting/)
- [2019 ES-SSA Annual Meeting](https://www.seismosoc.org/events/event/2019-es-ssa-annual-meeting/) - The 2019 ES-SSA Annual Meeting will take place 3-5 November 2019 in Columbus, Ohio. Meeting Co-chairs are Daniel Pradel and Christine Goulet.
- [Čermák7	Meeting on Heat Flow and the Geothermal Field](https://www.seismosoc.org/events/event/cermak7meeting-on-heat-flow-and-the-geothermal-field/) - MH
- [12NCEE and EERI Annual Meeting](https://www.seismosoc.org/events/event/12ncee-and-eeri-annual-meeting/) - MH
- [3ECEES European Conference on Earthquake Engineering and Seismology](https://www.seismosoc.org/events/event/3ecees-european-conference-on-earthquake-engineering-and-seismology/) - MH
- [WEGENER General Assembly](https://www.seismosoc.org/events/event/wegener-general-assembly/) - MH
- [AGU Fall Meeting](https://www.seismosoc.org/events/event/agu-fall-meeting-2/) - MH
- [Conference of the Asian Regional Section of IASC](https://www.seismosoc.org/events/event/conference-of-the-asian-regional-section-of-iasc/) - MH
- [SEG/AAPG IMAGE 2022](https://www.seismosoc.org/events/event/seg-aapg/) - MH
- [GSA Annual Meeting](https://www.seismosoc.org/events/event/gsa-annual-meeting/) - MH
- [The 26th Annual Ground System Architectures Workshop](https://www.seismosoc.org/events/event/the-26th-annual-ground-system-architectures-workshop/) - The 26th annual Ground System Architectures Workshop (GSAW) provides a forum for the world’s space-related ground system experts to collaborate with other ground system users, developers, and researchers through tutorials, presentations, working groups, panel discussions, and technical exhibits. GSAW will be completely online. To keep everyone safe and to accommodate the growing number of international participants, we
- [SSA Annual Meeting 2022](https://www.seismosoc.org/events/event/ssa-annual-meeting-2022/) - As we gather again in person, the 2022 conference will feature excellent scientific oral and poster presentations, the opportunity to network with peers and more – including an expanded number of in-person plenary sessions.
- [EGU General Assembly 2023](https://www.seismosoc.org/events/event/egu-general-assembly-2023/) - The purpose of the EGU General Assembly 2023 will bring together geoscientists from all over the world to one meeting covering all disciplines of the Earth, planetary and space sciences. It aims to provide a forum where scientists, especially early career researchers, can present their work and discuss their ideas with experts in all fields
- [AGU Fall Meeting](https://www.seismosoc.org/events/event/agu-fall-meeting/)
- [SCEC Workshop: Coordinating Post-Earthquake Field Data Collection](https://www.seismosoc.org/events/event/scec-workshop-coordinating-post-earthquake-field-data-collection/) - A SCEC workshop will be held online January 2022 focused on creating a framework to standardize post-earthquake response in four areas: coordination, communication, data collection methodology and data types.
- [Land Acknowledgement Workshop - in Spanish](https://www.seismosoc.org/events/event/land-acknowledgement-workshop-in-spanish/) - Monday, 8 November, 10-11:15 a.m. Pacific Mentors: Xyoli Pérez-Campos, Universidad Nacional Autónoma de México; Carlos Alberto Vargas, Universidad Nacional de Colombia; Ericka Alinne Solano, Universidad del Mar; Mario Ruiz, Instituto Geofísico de la Escuela Politécnica Nacional Learn how to write a land acknowledgement statement from four experts. This one hour and 15-minute workshop is free
- [6th International Conference on Steel Structure & Engineering](https://www.seismosoc.org/events/event/6th-international-conference-on-steel-structure-engineering-2/) - Conference Series llc LTC invites all the participants across the globe to attend the 6th International Conference on Steel Structure & Engineering during November 14th-15th, 2019 at Tokyo, Japan. Steel Structures Convention 2019 focuses on advanced methods and analysis of Steel and Concrete Structures specially. Steel Structures 2019 conference will make the perfect platform for global Construction development as it gathers renowned Speakers, Researchers, Structural
- [Seismology of the Americas—A Joint Meeting of the Seismological Society of America (SSA) and the Latin American and Caribbean Seismological Commission (LACSC)](https://www.seismosoc.org/events/event/seismology-of-the-americas-a-joint-meeting-of-the-seismological-society-of-america-ssa-and-the-latin-american-and-caribbean-seismological-commission-lacsc/)
- [Eastern Section of the Seismological Society of America Annual Meeting](https://www.seismosoc.org/events/event/eastern-section-of-the-seismological-society-of-america-annual-meeting/)
- [SEG/SPE Workshop: Injection Induced Seismicity](https://www.seismosoc.org/events/event/segspe-workshop-injection-induced-seismicity/) - Abstract Deadline: 14 July.
- [2019 Annual Meeting of the Seismological Society of America](https://www.seismosoc.org/events/event/2019-annual-meeting-of-the-seismological-society-of-america/)

## Recipients

- [Eduardo Miranda](https://www.seismosoc.org/award-recipient/eduardo-miranda/) - Eduardo Miranda of Stanford University was recognized for his contributions in developing new ground motion models and intensity measures, refining damping modification factors, and improving methods for assessing seismic demands on structures and nonstructural components. His work has shaped seismic design provisions, and he has emphasized the use of strong-motion data in both research and
- [Ruth Harris](https://www.seismosoc.org/award-recipient/ruth-harris/) - For her decades of thoughtful Society leadership and energetic committee participation, Ruth Harris is the recipient of the 2026 Distinguished Service to SSA Award. Harris, a senior research geophysicist at the U.S. Geological Survey, joined SSA in 1987. She was first elected as an SSA Board Member from 1997 to 2003. She served as SSA
- [Lisa Wald](https://www.seismosoc.org/award-recipient/lisa-wald/) - For her groundbreaking work in creating the earthquake information “hub” of the Earthquake Hazards Program of the U.S. Geological Survey, Lisa Wald is the recipient of the 2026 Frank Press Public Service Award. Wald began work at the USGS in 1987 in Pasadena, California, as a geophysicist and outreach director before becoming science communications and
- [Kevin Milner](https://www.seismosoc.org/award-recipient/kevin-milner/) - Kevin Milner is the recipient of the 2026 Charles F. Richter Early Career Award for his wide-ranging, globally adopted research that has become central to seismic hazard analysis modeling. Milner, a research geophysicist at the U.S. Geological Survey’s Geologic Hazards Science Center, was honored for his rare combination of computer science expertise, geophysical insight and
- [Peter Shearer](https://www.seismosoc.org/award-recipient/peter-shearer/) - Peter Shearer, professor of geophysics at Scripps Institution of Oceanography, University of California, San Diego, is the recipient of the 2026 Harry Fielding Reid Medal. Shearer is recognized as one of the leading observational seismologists of his generation, noted for his outstanding contributions to improving earthquake locations and other source properties and his research delineating the
- [Charles Langston](https://www.seismosoc.org/award-recipient/charles-langston/) - Charles Langston, professor emeritus at the Center for Earthquake Research and Information at the University of Memphis, is the 2025 recipient of the Harry Fielding Reid Medal. Langston is best known for his seminal research on receiver function methodology, developing methods of extracting and analyzing subtle signals from body waves that can be used to
- [Francisco José Sánchez-Sesma](https://www.seismosoc.org/award-recipient/francisco-jose-sanchez-sesma/) - Francisco José Sánchez-Sesma, professor at the Universidad Autónoma de Mexico (UNAM) is honored for decades of research aimed at understanding and modeling seismic wave propagation in complex geological media and its manifestations in ground motion, from strong shaking during large earthquakes to weak ambient vibrations such as microtremors and seismic noise. These efforts integrate the analysis
- [Jeffrey Given](https://www.seismosoc.org/award-recipient/jeffrey-given/) - Jeffrey Given is honored for his work in developing the complex seismic monitoring tools that were essential to building an operational Comprehensive Test Ban Treaty Organization (CTBTO) 2025 Frank Press Public Service Award. “Jeff’s scientific and development work on nuclear monitoring spans an impressive breadth from fundamental seismology to the hands-on minutia of developing and
- [James "Jim" Mori](https://www.seismosoc.org/award-recipient/james-jim-mori/) - James “Jim” Mori is the 2025 recipient of the Distinguished Service to SSA Award for his outstanding work in expanding the Seismological Society of America’s international presence and in ensuring investment in its newest members. Mori is also recognized for his outstanding service to SSA in several key leadership roles, including terms on the SSA
- [Weiqiang Zhu](https://www.seismosoc.org/award-recipient/weiqiang-zhu/) - Weiqiang Zhu, an assistant professor at the University of California, Berkeley, has been honored with the 2025 Charles F. Richter Early Career Award for his contributions to AI-based approaches to earthquake monitoring, numerical modeling and inverse problems that have pushed the frontier of seismological research. “Dr. Zhu's AI-centric approach to earthquake monitoring has been nothing
- [Kenneth W. Campbell](https://www.seismosoc.org/award-recipient/kenneth-w-campbell/) - Kenneth W. Campbell was recognized for his 50 years of research and practice-oriented contributions to earthquake hazard and risk characterization and his innovative and impactful utilization of earthquake ground motion data. He has been a leader at several professional organizations, including CoreLogic Inc. and EQE International/EQECAT, focused on seismic hazard and risk analysis used in
- [Laurie Baise](https://www.seismosoc.org/award-recipient/laurie-baise/) - Laurie Baise has continuously worked at the interface of earthquake science starting with her academic preparation. She received an undergraduate degree in civil engineering with a certificate in geological engineering and she completed graduate Master of Science degrees in both geophysics and geotechnical engineering while pursuing her Ph.D. in civil engineering. Baise’s research has spanned
- [Helen Crowley](https://www.seismosoc.org/award-recipient/helen-crowley/) - Helen Crowley, secretary general of the Global Earthquake Model (GEM) Foundation, was recognized for her research contributions at the interface between earthquake engineering and seismology, which were acknowledged early on in her career, after she won the 2009 European Geosciences Union Plinius Medal for “outstanding contributions … in the neighbouring fields of structural engineering and
- [Douglas Scott Dreger](https://www.seismosoc.org/award-recipient/douglas-scott-dreger/) - Douglas Scott Dreger, a professor of geophysics at the University of California, Berkeley is the recipient of the 2024 Distinguished Service Award (DSA) at the 2024 SSA Annual Meeting. Dreger served as SSA Publications Committee chair between 2016 and 2022. Dreger “instigated a broad range of initiatives intended to reinforce the reputation and financial performance of
- [Norman A. Abrahamson](https://www.seismosoc.org/award-recipient/norman-a-abrahamson-2/) - Norman A. Abrahamson, adjunct professor of civil and environmental engineering at the University of California, Berkeley and University of California, Davis, and former engineering seismologist at Pacific Gas & Electric Co, is the 2024 recipient of the Harry Fielding Reid Medal. Abrahamson is recognized as a global leader in the field of probabilistic seismic hazard assessment
- [Harley M. Benz](https://www.seismosoc.org/award-recipient/harley-m-benz/) - Harley M. Benz, a former U.S. Geological Survey technical coordinator for the Advanced National Seismic System (ANSS) and the director of the USGS National Earthquake Information Center (NEIC) is honored with the 2024 Frank Press Public Service Award. Benz is recognized for his work leading to profound improvements in how earthquake science is communicated to
- [Doyeon Kim](https://www.seismosoc.org/award-recipient/doyeon-kim/) - Doyeon Kim (DK), a lecturer in planetary science in the Faculty of Engineering at Imperial College London has been honored with the 2024 Charles F. Richter Early Career Award for his scientific productivity across a variety of topics, including recent work on Martian seismology and his pioneering approaches to seismic imaging. “I am sincerely grateful
- [Brian L. N. Kennett](https://www.seismosoc.org/award-recipient/brian-l-n-kennett/) - Brian L. N. Kennett, emeritus professor of seismology at the Australian National University, is the recipient of the 2023 Harry Fielding Reid Medal, Kennett is recognized for research spanning almost all areas of seismology, especially wave propagation, portable network deployments, seismic tomography and distributed acoustic sensing (DAS). He is perhaps best well known for his
- [José A. Martinez-Cruzado](https://www.seismosoc.org/award-recipient/jose-a-martinez-cruzado/) - José A. Martinez-Cruzado, professor of the civil engineering and surveying department at the University of Puerto Rico at Mayagüez is the recipient of the 2023 Bruce Bolt Medal. Martinez-Cruzado has been a leader in earthquake engineering in Puerto Rico and the Caribbean region for three decades. As the director of the Puerto Rico Strong Motion
- [Mitch Withers](https://www.seismosoc.org/award-recipient/mitch-withers/) - Mitch Withers, an associate research professor at the University of Memphis and the Center for Earthquake Research and Information (CERI), received the 2023 Distinguished Service to SSA award for his service as SSA treasurer for 15 years. From 2007 to 2022, Withers monitored the society’s monthly financial progress, provided management counsel, and served on several
- [Daniel Trugman](https://www.seismosoc.org/award-recipient/daniel-trugman/) - Daniel Trugman, an assistant professor at the Nevada Seismological Laboratory at the University of Nevada, Reno, has been honored with the 2023 Charles F. Richter Early Career Award for his scientific productivity, contributions to open-source community software, outreach and teaching. “I am incredibly honored to have received this award; I wouldn’t be here without the
- [Susan Hough](https://www.seismosoc.org/award-recipient/susan-hough/) - For her effective communication of science to the public and her work to establish and improve earthquake monitoring and hazard assessment worldwide, SSA honors Susan Hough with the 2023 Frank Press Public Service Award. Hough, a geophysicist and ground motions task leader at the U.S. Geological Survey, will receive the Press Award at the 2023
- [Zhigang Peng](https://www.seismosoc.org/award-recipient/zhigang-peng-2/) - Zhigang Peng received the Distinguished Service to SSA Award for his six years of service as Editor-in-Chief of Seismological Research Letters. In their nomination of Peng for the award, past SSA journal editors Andrew Michael and John Ebel cited Peng’s innovative spirit and energetic work to expand the journal’s reach and prestige from 2013 to
- [Jack Baker](https://www.seismosoc.org/award-recipient/jack-baker/) - Jack Baker’s research is at the forefront of the interface between earthquake seismology and earthquake engineering, focusing on the use of probabilistic and statistical tools for modeling of extreme loads on structures. At Stanford, he has worked on projects involving risk to spatially distributed systems, earthquake ground motion characterization, and predictions of soil failure from
- [David J. Wald](https://www.seismosoc.org/award-recipient/david-j-wald/) - David J. Wald is involved in research, development, and operations of real-time information systems at the NEIC. He is responsible for developing and managing ShakeMap, which provides near-real-time maps of ground motion and shaking intensity following significant earthquakes; the citizen-science earthquake reporting system Did You Feel it?; and leads development and operations of other systems
- [C.B. Crouse](https://www.seismosoc.org/award-recipient/c-b-crouse/) - C.B. Crouse has been a consultant in earthquake engineering and engineering seismology for 47 years. He works as principal engineer at AECOM in Seattle, Washington, where he primarily conducts seismic hazard and soil-structure interaction studies and develops earthquake ground motions (response spectra and time histories) for various types of projects throughout the world. Crouse received
- [Timothy Ahern](https://www.seismosoc.org/award-recipient/timothy-ahern/) - Ahern became the program manager for the IRIS Data Management Center shortly after IRIS was formed and later became director of data services for IRIS, serving in that position for nearly three decades. He ushered in a new collaborative, open-data approach to observational seismology worldwide that has improved hazard assessment and increased public safety in
- [Seyed Mostafa Mousavi](https://www.seismosoc.org/award-recipient/seyed-mostafa-mousavi/) - Mousavi, a research scientist at Google and an adjunct professor at Stanford University, has conducted pioneering works in the emerging field of machine learning applications in seismology. He has developed algorithms to solve multiple challenging seismological research problems, including earthquake source depth classification, earthquake signal detection, location determination, magnitude estimation, event discrimination, and seismic wave
- [William Ellsworth](https://www.seismosoc.org/award-recipient/william-ellsworth/) - Ellsworth is recognized for his critical contributions to earthquake location, earthquake nucleation, earthquake recurrence and induced seismicity research. With Felix Waldhauser, Ellsworth developed the double-difference (DD) earthquake location method, which has had a tremendous influence on the field of seismology since the publication of the seminal study in the Bulletin of the Seismological Society of
- [Christa von Hillebrandt-Andrade](https://www.seismosoc.org/award-recipient/christa-von-hillebrandt-andrade/) - Christa von Hillebrandt-Andrade, manager of the U.S. National Weather Service Caribbean Tsunami Program and former director of the Puerto Rico Seismic Network, received the Press Award for her work in developing real-time data acquisition systems, rapid response capabilities and pioneering public outreach and education efforts have had a profound impact on earthquake and tsunami monitoring
- [Alice-Agnes Gabriel](https://www.seismosoc.org/award-recipient/alice-agnes-gabriel/) - Alice-Agnes Gabriel has been honored with the Charles F. Richter Early Career Award for her innovative research in earthquake rupture dynamics and tsunami genesis, among other topics, using physics-based models and high-performance computing. Gabriel, an assistant professor at the Institute of Geophysics at Ludwig-Maximilians-Universität München, is best known for her prolific research in earthquake physics,
- [Gail M. Atkinson](https://www.seismosoc.org/award-recipient/gail-m-atkinson/) - Gail M. Atkinson is recognized for her seminal contributions in engineering seismology, especially regarding ground motion characterization. She is one of the pioneers of the stochastic ground motion simulation method, used to predict strong ground motions from earthquakes in regions where seismic data are limited. Her work to develop ground-motion prediction equations (GMPEs), which predict
- [Brian Tucker](https://www.seismosoc.org/award-recipient/brian-tucker/) - Brian Tucker, founder and former president of the nonprofit organization GeoHazards International, receives the Press Award for his efforts to make the world’s most vulnerable communities safer from earthquakes and other natural hazards. He and his colleagues in GeoHazards International brought together seismologists, geologists, engineers, sociologists and disaster managers to help communities around the globe
- [Julian J. Bommer](https://www.seismosoc.org/award-recipient/julian-j-bommer/) - Julian J. Bommer has worked for more than 30 years at the interface between seismology and earthquake engineering as both a researcher and practitioner. A Fellow of the UK Institution of Civil Engineering, he obtained a Ph.D. in Engineering Seismology under the supervision of Professor Nick Ambraseys, who encouraged him to undertake field investigations of
- [Marine Denolle](https://www.seismosoc.org/award-recipient/marine-denolle/) - Harvard University Assistant Professor Marine Denolle has been honored with the 2019 Charles F. Richter Early Career Award for her important contributions to developing synthetic seismograms that can be used for ground motion predictions for future earthquakes, with particular applications to how seismic waves behave in sedimentary basins. Denolle is a leading researcher in developing
- [Karen Fischer](https://www.seismosoc.org/award-recipient/karen-fischer/) - Brown University Professor Karen M. Fischer receives the Reid Medal for her pioneering research on Earth’s upper mantle structure and dynamics, the structure and evolution of continental lithosphere, and the dynamics of subduction systems. She is “an outstanding seismologist who has conducted many observational and modeling studies of the Earth's seismic structure, illuminating dynamic mantle-flow
- [Jonathan Bray](https://www.seismosoc.org/award-recipient/jonathan-bray/) - Jonathan D. Bray, Professor of Geotechnical Engineering at UC Berkeley was selected as the 2012 Joyner Lecturer. He delivered his lecture at the SSA Annual Meeting in April 2012 in San Diego, CA. Dr. Bray was chosen because of his scientific and engineering research and exchange of information regarding liquefaction effects, the effects of surface
- [Kelvin Berryman](https://www.seismosoc.org/award-recipient/kelvin-berryman/) - Kelvin manages the newly-formed research platform that integrates all of New Zealand’s government-funded research in natural hazards. The portfolio ranges from geological and weather-related hazards integrated natural hazard risk, resilient engineering and infrastructure research, and societal and land-use planning aspects of natural hazard mitigation. Kelvin is a Principal Scientist at GNS Science with over 35
- [David Boore](https://www.seismosoc.org/award-recipient/david-boore-2/) - David Boore is a Geophysicist at the U.S. Geological Survey in Menlo Park, California. Dr. Boore has published over 260 papers, most dealing with various aspects of the problem of estimating the ground shaking from large earthquakes. The topics covered in these publications range from the seismic source to site response, with stops in between.
- [Paul Somerville](https://www.seismosoc.org/award-recipient/paul-somerville/) - Paul Somerville is an engineering seismologist at AECOM (formerly at its predecessor organizations, URS and Woodward-Clyde) in Los Angeles. He is also Chief Geoscientist at Risk Frontiers at Macquarie University in Sydney, Australia. He has applied physics-based modeling methods to understand the influence of earthquake source and seismic wave propagation effects on strong ground motion.
- [Jonathan P. Stewart](https://www.seismosoc.org/award-recipient/jonathan-p-stewart/) - Jonathan P. Stewart is professor and chair of the Civil & Environmental Engineering Department at UCLA. He was selected as the 2016 Joyner Lecturer in recognition of his work on the characterization of earthquake ground motions for engineering applications, with special emphasis on site response effects. He will deliver his lecture in April 2016 at
- [William R. Lettis](https://www.seismosoc.org/award-recipient/william-r-lettis/) - William R. Lettis has been selected as the William B. Joyner Memorial Lecturer for 2017. Lettis founded William Lettis & Associates, Inc. in 1990 and Lettis Consultants International, Inc. in 2011 to provide consultancy at the interface of earthquake science and earthquake engineering. He will deliver his lecture in April 2017 at the Seismological Society of
- [Ellen M. Rathje](https://www.seismosoc.org/award-recipient/ellen-m-rathje/) - University of Texas at Austin Professor Ellen M. Rathje has been selected as the 2018 William B. Joyner Lecturer. Rathje is the Warren S. Bellows Centennial Professor in the Department of Civil, Architectural, and Environmental Engineering and also a Senior Research Scientist at the Bureau of Economic Geology at the University of Texas at Austin. Her
- [Vedran Lekic](https://www.seismosoc.org/award-recipient/vedran-lekic/) - Since his early research on deep earthquakes, Vedran Lekic has repeatedly developed new ways of analyzing and modeling seismic data, leading to improved understanding of Earth’s large-scale inner strucutre. For his work, the Seismological Society of America (SSA) has honored the 31 year-old lekic with its Charles F. Richter Early Career Award, which honors outstanding contributions to
- [Yousef Bozorgnia](https://www.seismosoc.org/award-recipient/yousef-bozorgnia/) - The Consortium of Strong Motion Observation Systems (COSMOS), Earthquake Engineering Research Institute (EERI) and SSA have selected Yousef Bozorgnia as the 2019 recipient of the Bruce Bolt Medal. Bozorgnia, a professor at the University of California, Los Angeles in both the Department of Civil and Environmental Engineering and the John Garrick Institute for the Risk
- [Robert W. Graves](https://www.seismosoc.org/award-recipient/robert-w-graves/) - The Earthquake Engineering Research Institute (EERI) and the Seismological Society of America (SSA) are pleased to announce that U.S. Geological Survey research geophysicist Robert W. Graves has been named the 2019 William B. Joyner Lecturer. Graves will deliver the Joyner Lecture at the EERI 2019 Annual Meeting to be held 5-8 March 2019 in Vancouver,
- [Lucy Jones](https://www.seismosoc.org/award-recipient/lucy-jones/) - Lucy Jones, founder of the Dr. Lucy Jones Center for Science and Society, who served over three decades with the U.S. Geological Survey, is recognized for her significant and persistent contributions to earthquake safety and her generous work in sharing seismology research with the public “Lucy Jones has advanced public safety and information about earthquakes
- [Amanda Thomas](https://www.seismosoc.org/award-recipient/amanda-thomas/) - University of Oregon Assistant Professor Amanda Thomas is recognized for her important contributions to understanding episodic tremor and slip phenomena, the slow-earthquake rumblings that take place below the locked zones of faults. “Combining seismology with a broad understanding of the physics of material deformation, Dr. Thomas has made seminal and fundamental contributions to understanding earthquake source
- [David M. Boore](https://www.seismosoc.org/award-recipient/david-m-boore/) - USGS emeritus geophysicist David M. Boore received the Reid Medal for his four decades of work on the prediction of strong ground motion from earthquakes. “His contributions in the theory and practice of strong-ground motion estimation have been emulated by both earthquake scientists and earthquake engineers around the world. His scientific work has been cited
- [George Plafker](https://www.seismosoc.org/award-recipient/george-plafker/) - USGS emeritus geologist George Plafker and his colleagues did painstaking fieldwork after the magnitude 9.2 Alaskan earthquake in 1964, covering hundreds of kilometers of Alaskan shoreline in small boats, helicopters, and float-equipped aircraft after the 1964 quake helped to launch a new field of megathrust earthquake geology, which used observations of the placement of intertidal
- [Jonathan P. Stewart](https://www.seismosoc.org/award-recipient/jonathan-p-stewart-2/) - Jonathan P. Stewart, professor and chair of the civil and environmental engineering department at University of California, Los Angeles, was chosen as the 2018 recipient of the Bruce A. Bolt Medal, which is awarded jointly by the Seismological Society of America (SSA), the Consortium of Organizations for Strong-Motion Observation Systems (COSMOS) and the Earthquake Engineering
- [Tom Hanks](https://www.seismosoc.org/award-recipient/tom-hanks/) - Thomas C. Hanks, Research Geophysicist at the Menlo Park, CA office of the U.S. Geological Survey, was selected as the 2011 Joyner Lecturer. He delivered his lecture at the SSA April 2011 Annual Meeting in Memphis, TN. Hanks? research has ranged widely across the causes and effects of earthquakes, including studies of earthquake source parameters
- [Arthur Frankel](https://www.seismosoc.org/award-recipient/arthur-frankel/) - Arthur D. Frankel, Research Geophysicist in the Seattle office of the U.S. Geological Survey, was selected as the 2010 Joyner Lecturer. He delivered his lecture at the SSA April 2010 Annual Meeting in Portland, Oregon. Dr. Frankel’s work provides the crucial bridge at the interface of earthquake science and engineering to produce the national seismic
- [Robin McGuire](https://www.seismosoc.org/award-recipient/robin-mcguire/) - Robin K. McGuire, Ph.D., Founder and President of Risk Engineering Inc., was the 2009 Joyner Lecturer. He delivered his lecture at the SSA 2009 Annual Meeting in Monterey, California. McGuire holds degrees in structural engineering from MIT and Univ. of California, Berkeley. For 30 years he has been consulting in seismic hazard analysis, earthquake engineering,
- [Chris Poland](https://www.seismosoc.org/award-recipient/chris-poland/) - Chris Poland was the Joyner Lecturer for 2008. He is Chairman and CEO of Degenkolb Engineers, one of the nation’s leading structural engineering firms. His research has contributed to the development of federal standards for seismic evaluations and mitigation for all federal buildings and numerous guidelines related to earthquake hazard reduction activities such as the
- [Gail Atkinson](https://www.seismosoc.org/award-recipient/gail-atkinson/) - Gail Atkinson was the Joyner Lecturer for 2007. She is Professor of Geophysics at University of Western Ontario and has spent much of her career working at the engineering-seismology interface. She has authored more than 100 research articles on the subjects of earthquake ground motions and seismic hazards; among these are well-known prediction equations for
- [Norm Abrahamson](https://www.seismosoc.org/award-recipient/norm-abrahamson/) - Norm Abrahamson was the Joyner Lecturer for 2006, the Centennial Year of the San Francisco earthquake and the founding of the SSA. Norm brings a very pragmatic approach to ground-motion estimation, with a keen sense of what the engineering community needs to know and a remarkable ability, through his rapport with the seismological community, to
- [Allin Cornell](https://www.seismosoc.org/award-recipient/allin-cornell/) - The 2005 Joyner Lecturer was C. Allin Cornell. Allin is best known for original and continuing work on probabilistic seismic hazard analysis (PSHA), now recognized for its great power in synthesizing earth-sciences data, models, and uncertainties in probabilistic portrayals. He is a member of the National Academy of Engineering. He is past President of the
- [Lloyd Cluff](https://www.seismosoc.org/award-recipient/lloyd-cluff/) - Joyner Lecturers are chosen on the basis of their work at the interface of earthquake science and earthquake engineering, whether they be contributions from earthquake science to earthquake engineering or from earthquake engineering to earthquake science. In the case of Lloyd Cluff, the first Joyner Lecturer, it is hard to decide which way the arrow
- [Keith Knudsen](https://www.seismosoc.org/award-recipient/keith-knudsen/) - Keith Knudsen of the U.S. Geological Survey is recognized for his nine years of service as Secretary for SSA. In their nomination of Knudsen for the award, five past presidents of SSA commended him for his advice on multiple issues related to SSA operations and for his work in a demanding role for the Society,
- [Farzad Naeim](https://www.seismosoc.org/award-recipient/farzad-naeim/) - Farzad Naeim (M. EERI, 1983), President of Farzad Naeim, Inc. and Adjunct Professor of Engineering at University of California, Irvine, has been named the 2017 recipient of the Bruce A. Bolt Medal. The Bruce Bolt Medal is awarded jointly by the Consortium of Strong Motion Observation Systems (COSMOS), the Seismological Society of America (SSA), and the Earthquake Engineering Research Institute (EERI)to
- [Roger D. Borcherdt](https://www.seismosoc.org/award-recipient/roger-d-borcherdt/) - Dr. Borcherdt’s career is marked with “exceptional scientific contributions in the fields of seismology and engineering seismology, extraordinarily broad in scope” as noted on the Presidential Distinguished Service Award he received in 2010 as the highest honor of the U.S. Department of Interior. His contributions, evident in 200 publications, include pioneering site-response studies resulting in
- [John Anderson](https://www.seismosoc.org/award-recipient/john-anderson/) - One of John Anderson’s first publications in 1979 estimated the earthquake recurrence rate on a fault by incorporating how much a fault slips each year, a novel approach to examining seismicity that foreshadowed the impact of his research on seismic hazard assessment. Anderson, a professor of geophysics at the University of Nevada at Reno (UNR),
- [Anthony F. Shakal](https://www.seismosoc.org/award-recipient/anthony-f-shakal/) - Dr. Shakal has been associated with the California Geological Survey’s Strong Motion Instrumentation Program (SMIP) for the past 32 years, and has successfully grown and led the Program for the past 27 years. Under Dr. Shakal’s direct supervision and innovative management, the SMIP operates the largest and most advanced strong–motion network in the United States.
- [Mustafa Erdik](https://www.seismosoc.org/award-recipient/mustafa-erdik/) - Mustafa Erdik’s career has been marked by inspiring leadership guiding ambitious Turkish and international programs; distinguished research discoveries highly cited by researchers; practical seismic hazards software that is prized among practitioners; and stellar success in bringing high-quality ground and building instrumentation networks to his nation. Erdik is recognized by engineers and seismologists worldwide as an
- [Norman A. Abrahamson](https://www.seismosoc.org/award-recipient/norman-a-abrahamson/) - Professor Bruce Bolt was recognized in his time by earthquake engineers and seismologists worldwide as the expert in engineering seismology. His PhD student, Dr. Norman Abrahamson, is now advancing the leading edge of the field and is arguably the world’s foremost authority on engineering seismology. Following his PhD in 1985, Abrahamson worked for several consulting
- [Kojiro Irikura](https://www.seismosoc.org/award-recipient/kojiro-irikura/) - Kojiro Irikura has made an enormous contribution to the analysis and sharing of strong-motion earthquake data throughout his career in Japan. During his career at the Disaster Prevention Research Institute of Kyoto University, Irikura, authored nearly 200 publications, supervised more than 30 students in advanced degrees and became a fixture at international conferences and meetings.
- [David Boore](https://www.seismosoc.org/award-recipient/david-boore/) - Boore, a geophysicist with the United State Geological Survey, developed SMSIM, a well-known method for computing estimates of ground motion from simulated earthquakes that is used by engineers and designers. With more than 230 publications during his career, Boore’s work has advanced the understanding of strong-motion seismology. Focusing primarily on strong ground motion, Boore’s work
- [Wilfred D. (Bill) Iwan](https://www.seismosoc.org/award-recipient/wilfred-d-bill-iwan/) - Iwan is honored for his many accomplishments in advancing earthquake strong-motion monitoring networks and instrumentation in the US and internationally, his research accomplishments in earthquake engineering and engineering seismology, and his effective leadership roles in professional organizations to further the acquisition and application of strong-motion data. Notable among these activities is his organization and leadership
- [Diane I. Doser](https://www.seismosoc.org/award-recipient/diane-i-doser/) - Diane I. Doser is recognized for her two decades of outstanding dedication and leadership of the Bulletin of the Seismological Society of America (BSSA). Doser is the director of the Kidd Memorial Seismic Observatory and professor in the department of geological sciences at the University of Texas at El Paso. She served as BSSA Associate Editor from 1996 to
- [Susan Newman](https://www.seismosoc.org/award-recipient/susan-newman/) - SSA Executive Director Susan Newman worked with and for the Seismological Society of America for 45 years making it one of the preeminent seismological institutions in the USA and the world. The success of our Society is in great measure due to Susan’s commitment to service; she was at the core of our advancement, working
- [Andy Michael](https://www.seismosoc.org/award-recipient/andy-michael/) - As editor-in-chief of the Bulletin of the Seismological Society of America (BSSA), Andrew J. Michael transformed the journal through innovative refinements in the submission and publication process and by modernizing its operations so that it will continue in the digital age as the premier seismology journal of record. For his service to the Seismological Society
- [Joe Litehiser](https://www.seismosoc.org/award-recipient/joe-litehiser/) - Joe J. Litehiser, who served as Secretary of the SSA from March 1987 to April 2007, the second longest tenure in an officer position in the organization’s history, was presented with this award for Distinguished Service to the SSA at the Annual Meeting in Monterey, California in April 2009. As Secretary, Litehiser used a nearly
- [Michael Fehler](https://www.seismosoc.org/award-recipient/michael-fehler/) - Michael Fehler was selected because his contributions were “numerous and important, ranging from BSSA Editor, to SSA president, to distinguished scientist. Mike brings passion, grace, and attention to detail to his work, which shows in his many successes, and which has also been an inspiration to others.” Mike took on the work of Editor of
- [Wilbur (Bill) Rinehart](https://www.seismosoc.org/award-recipient/wilbur-bill-rinehart/) - Bill Rinehart was selected by the Board at the 2006 Annual Meeting to receive the award for Distinguished Service to the SSA, in thanks for his extraordinary efforts to document and preserve the Society’s history during our Centennial Year. Bill was honored at the luncheon of the 2007 Annual Meeting.
- [John Ebel](https://www.seismosoc.org/award-recipient/john-ebel/) - John Ebel was selected by the Board at the 2003 Annual Meeting to be the first recipient of the Distinguished Service to the SSA Award, in thanks for his long and capable editorship of SRL from 1995, when the society took over publication of the journal, until the end of 2001. John was honored at
- [Lori Dengler](https://www.seismosoc.org/award-recipient/lori-dengler/) - “California’s level of preparedness for earthquakes and tsunamis, particularly along the north coast that is part of Cascadia, is very much due to [Dengler’s] efforts to bring the science to the public, the local, regional, tribal, state and federal officials who must make and support preparations, and the emergency managers who have to deal with the effects of earthquakes and
- [Michael E. Wysession](https://www.seismosoc.org/award-recipient/michael-e-wysession/) - Wysession is a professor in the Department of Earth and Planetary Sciences at Washington University in St. Louis. In his nomination for the Press award, his colleagues praised the far-reaching impact of his work on Earth and space sciences education from K-12 to university faculty training. One of his most notable roles in this field came
- [Walter J. Arabasz](https://www.seismosoc.org/award-recipient/walter-j-arabasz/) - Walter J. Arabasz is a research professor emeritus of geology and geophysics at the University of Utah, Salt Lake City. For more than 30 years, Arabasz led the development of the University of Utah’s regional seismic network and remains a powerful voice in public policy making for earthquake risk reduction. In Utah, his work has
- [Randall White](https://www.seismosoc.org/award-recipient/randall-white/) - The Seismological Society of America (SSA) honored seismologist Randall White for his scientific leadership in response to volcanic eruptions, both saving lives and sharing his techniques of eruptions forecasting that are now in use at volcano observatories around the world. SSA awarded White with the Frank Press Public Service Award on April 17 during its
- [Eric Calais](https://www.seismosoc.org/award-recipient/eric-calais/) - Throughout Eric Calais’s career studying active deformation at plate boundaries and interiors, Eric Calais always had a focus on key questions for hazard assessment, particularly in northeastern Caribbean, one of his longtime study areas. When a devastating earthquake struck Haiti in January 2010, Calais was among the first scientists to arrive on the ground to investigate the
- [Hugo Yepes](https://www.seismosoc.org/award-recipient/hugo-yepes/) - The Frank Press Public Service Award was presented to Ecuadorian seismologist Hugo Yepes at SSA’s 2011 annual meeting in Memphis, Tennessee. Yepes’ work throughout his career advanced hazard assessment and risk mitigation efforts in Ecuador and South America. For more than 20 years, Hugo Yepes has dedicated his life to furthering geological hazard assessment and
- [Art Frankel](https://www.seismosoc.org/award-recipient/art-frankel/) - The Frank Press Public Service Award was presented to Art Frankel at the 2010 annual meeting in Portland, OR. Since being tasked with leading an update to national seismic hazard maps for the United States Geological Survey (USGS) in 1993, Art Frankel has contributed significantly to improved public policy, building codes and earthquake safety across the United
- [David Wald](https://www.seismosoc.org/award-recipient/david-wald/) - The Frank Press Public Service Award was presented to David Wald at the 2009 annual meeting in Monterey, CA. Wald serves as a research scientist at the United States Geological Survey in Golden, CO, as well as an adjunct professor at Colorado School of Mines. Throughout his career, Wald has expanded the reach and application of seismic
- [Frank Press](https://www.seismosoc.org/award-recipient/frank-press/) - To honor his lifetime of exemplary public service, the SSA Board has awarded the Society’s first Public Service Award to Frank Press, a Director of the Washington Advisory Group in Washington, D.C. Prof. Press began as a seismologist at Columbia (PhD 1949) and joined the faulty of CalTech in 1955. Three years later he was
- [Annemarie Baltay](https://www.seismosoc.org/award-recipient/annemarie-baltay/) - “Through a combination of source studies and ground motion prediction research, [Baltay] has carved a niche for herself that is unique in seismology for her generation,” said Gregory Beroza, the Wayne Loel Professor of Earth, Energy, and Environmental Sciences at Stanford University and Baltay’s Ph.D. advisor, noting that her work to date has made “tangible
- [Diego Melgar Moctezuma](https://www.seismosoc.org/award-recipient/diego-melgar-moctezuma/) - Early in his career, seismologist Diego Melgar Moctezuma has already made significant research contributions in the areas of earthquake rupture and early warning, tsunami modeling, and community outreach regarding earthquakes and geosciences. Melgar, a 32-year-old assistant researcher at the Seismological Laboratory at the University of California, Berkeley, “has already distinguished himself as a top researcher
- [Fan-Chi Lin](https://www.seismosoc.org/award-recipient/fan-chi-lin/) - Fan-Chi Lin has distinguished himself by the wide range of his research contributions, particularly in the area of using ambient noise to construct images of the Earth’s crust and upper mantle. Since his Ph.D. was awarded in 2009, Lin has become one of the originators and leading experts on this type of imaging. Lin is
- [Victor Tsai](https://www.seismosoc.org/award-recipient/victor-tsai/) - Still early in his career, Victor Tsai has already established himself as a leading seismologist, conducting pioneering research in the emerging fields of ambient noise and glacier and river seismology. Tsai has published 39 peer-reviewed papers that reflect his diverse research interests and novel approaches to tackling challenging questions in seismology, glaciology and mechanics. For his work,
- [Katsuichiro Goda](https://www.seismosoc.org/award-recipient/katsuichiro-goda/) - The Seismological Society of America (SSA) will honor Katsuichiro Goda for his prolific work to reduce earthquake risk around the world, awarding him the Charles Richter Early Career Award on April 17 at its annual meeting in Salt Lake City. His multi-disciplinary background has allowed Goda, a lecturer in civil engineering at the University of Bristol and
- [David Shelly](https://www.seismosoc.org/award-recipient/david-shelly/) - David Shelly has quickly established himself as world leader in observational seismology, having already made a dramatic impact on the field of seismology through his pioneering work to detect and locate deep tectonic tremor. For his work, the Seismological Society of America will honor Shelly with its Charles. F. Richter Early Career Award, which honors outstanding
- [Zhigang Peng](https://www.seismosoc.org/award-recipient/zhigang-peng/) - Zhigang Peng has made seismological discovery a regular occurrence early in his career. Peng has written 35 peer-reviewed papers that have contributed much to the understanding physics of earthquakes and faults. An Assistant Professor in the School of Earth and Atmospheric Sciences at the Georgia Institute of Technology since 2006, Peng’s contributions to earthquake seismology have
- [Karen Felzer](https://www.seismosoc.org/award-recipient/karen-felzer/) - This award was presented to Karen Felzer, USGS Pasadena, at the 2010 annual meeting in Portland, Oregon. In her relatively young career, Felzer has produced transformative and sometimes valuably controversial research by utilizing statistical approaches to tackle tough seismological questions. Her oft-cited work has constructively challenged previously held theories and reshaped the way earthquake physics
- [Miaki Ishii](https://www.seismosoc.org/award-recipient/miaki-ishii/) - This award was presented to Miaki Ishii, Harvard University, at the 2009 annual meeting in Monterey, CA. In her young career, Ishii, an assistant professor of earth and planetary science at Harvard University, has made two groundbreaking discoveries in geophysics that have fostered intense debate and subsequent research that has changed the understanding of deep Earth
- [Jeanne Hardebeck](https://www.seismosoc.org/award-recipient/jeanne-hardebeck/) - This award was presented to Jeanne Hardebeck, USGS, Menlo Park, at the 2007 annual meeting. The Richter Committee noted that, “Hardebeck’s contributions to seismological research have been aimed at the central issues in earthquake studies including especially the state of stress and the strengths of faults, problems that have been persistently clouded by speculation and
- [Emily Brodsky](https://www.seismosoc.org/award-recipient/emily-brodsky/) - Dr. Emily Brodsky of the University of California, Santa Cruz, has been selected to be the first winner of the Charles F. Richter Early Career Award. The Richter committee was impressed by the breadth and innovative aspects of Emily Brodsky’s research, which is broadly focused on elucidating “how earthquakes, volcanoes and landslides work.” She is cited
- [Lev P. Vinnik](https://www.seismosoc.org/award-recipient/lev-p-vinnik/) - Lev P. Vinnik serves as the head of the Group of Seismological Studies in the Russian Academy of Sciences’ Institute of Physics of the Earth, based in Moscow. A pioneer in body-wave seismology for more than 50 years, Vinnik is well-known for his careful and meticulous data analyses and for developing some of the fundamental tools that
- [Christopher H. Scholz](https://www.seismosoc.org/award-recipient/christopher-h-scholz/) - Throughout his 50-year career, Christopher Scholz, Professor of Earth and Environmental Sciences and of Applied Physics and Applied Mathematics at Columbia University and Lamont-Doherty Earth Observatory has brought a unique, interdisciplinary approach to seismology that bridges the gap from laboratory studies of rock mechanics to fundamental studies of crustal-scale deformation. His work on the brittle
- [Thorne Lay](https://www.seismosoc.org/award-recipient/thorne-lay/) - An influential seismologist and community leader whose research has refined our understanding of the Earth’s deep interior, Thorne Lay was honored by SSA at the 2015 annual meeting in Pasadena, Calif. Known for consistently contributing to advances in some of the most difficult problems in seismology, Lay’s broad scientific outlook is reflected by the breadth of his
- [Kerry Edward Sieh](https://www.seismosoc.org/award-recipient/kerry-edward-sieh/) - The Seismological Society of America (SSA) presented its highest honor, the Harry Fielding Reid Medal, to Kerry Edward Sieh, Director of the Earth Observatory of Singapore at the Nanyang Technological University of Singapore, at its annual meeting in Anchorage, Alaska April 30-May 02, 2014. Throughout his career, geologist Kerry Sieh has developed new ideas and
- [James Rice](https://www.seismosoc.org/award-recipient/james-rice/) - The Seismological Society of America (SSA) presented its highest honor, the Harry Fielding Reid Medal, to James R. Rice, the Mallinckrodt Professor of Engineering Sciences and Geophysics at Harvard University, at its annual meeting April 17-19 in Salt Lake City. First awarded in 1975, the Harry Fielding Reid Medal is awarded for outstanding contributions in
- [Barbara Romanowicz](https://www.seismosoc.org/award-recipient/barbara-romanowicz/) - Through the course of her career, Barbara Romanowicz has studied the Earth from its surface to its center, establishing herself as one of the most influential seismologists of her time. For her outstanding contributions in seismology and earthquake engineering, the Seismological Society of America (SSA) awarded Romanowicz its top honor, the Harry Fielding Reid Medal,
- [Tatyana G. Rautian](https://www.seismosoc.org/award-recipient/tatyana-g-rautian/) - A heavyweight in the field of seismology who drove research efforts in the former Soviet Union, Tanya Glebovna Rautian, often called “The Charles Richter of the former Soviet Union” and “generator of ideas,” has dedicated her life to the development of seismology and science in central Asia. She is widely recognized as a pioneer in

## Presentations

- [Banish Impostor Syndrome for Good!](https://www.seismosoc.org/presentations/banish-impostor-syndrome-for-good/) - Many of us have experienced imposter syndrome, which makes us believe that we are unworthy and frauds. It tricks us into minimizing our contributions and value. More critically, impostor syndrome insidiously robs us of future prosperity as it convinces us we do not belong and should not pursue opportunities to advance our career, launch and
- [Cover Letters – Here's How You Write Them](https://www.seismosoc.org/presentations/cover-letters-heres-how-you-write-them/) - Let’s be honest, cover letters are annoying to write, and they are an absolutely essential part of the process of a job search. In this webinar, you will learn a recipe to write a cover letter that you can utilize for the rest of your life, whether you are going for an internship, fellowship, scholarship,
- [How to Get a Job Now: Strategies and Tactics to Advance Your Career in a Challenge](https://www.seismosoc.org/presentations/howtogetajob/) - It is never an easy time to look for a job, especially during a crisis like we are currently experiencing. This webinar will provide specific tactics you can employ now to find rewarding work. We will discuss effective techniques to clearly communicate your value to potential employers, how and where to find specific types of
- [Virtual Networking: How to Network and Find Collaborators from Afar with Alaina Levine](https://www.seismosoc.org/presentations/virtual-networking-how-to-network-and-find-collaborators-from-afar-with-alaina-levine/) - Networking is the most honorable and valuable endeavor in which you can engage, because it is built on a spirit of generosity. At its core, networking is all about crafting win-win alliances where both parties provide value. You may think that “networking” can only take place in person, but this is a myth! In fact,
- [Seismic Tomography of the Nepal Himalayas and Geodynamic Implications for the 2015 Nepal Earthquake](https://www.seismosoc.org/presentations/seismic-tomography-of-the-nepal-himalayas-and-geodynamic-implications-for-the-2015-nepal-earthquake/) - 3-D Seismic tomography using local and regional earthquake data reveals variations of crustal thickness beneath the Nepal Himalayas. A low-velocity anomaly in upper part of the model down to depths of ~40 to 80 km represents crust. Lower limit of this anomaly represents Moho depth variations. Thick transitional zone may represent underthrusting of one continental
- [Moving Toward Region-Specific Ground-Motion: Reducing Uncertainty in Gmpes with Physical Representations of Path Effects](https://www.seismosoc.org/presentations/moving-toward-region-specific-ground-motion-reducing-uncertainty-in-gmpes-with-physical-representations-of-path-effects/) - Path-specific ground-motion models, or fully non-ergodic ground-motion prediction equations (GMPEs) are the next step in improving ground-motion estimation, in particular for critical facilities where design targets fall at very low probabilities of exceedance. Statistical approaches in regions with high seismicity rates have been shown to be robust methods for moving towards fully non-ergodic models, however
- [Incorporating Long-Period (T>1 S) 3D Simulations into the U.S. National Seismic Hazard Model](https://www.seismosoc.org/presentations/incorporating-long-period-t1-s-3d-simulations-into-the-u-s-national-seismic-hazard-model/) - With the introduction of additional periods into the design spectrum of U.S. building codes, future National Seismic Hazard Models (NSHMs) must consider the effects of longer period (T>1 s) earthquake ground motions. These longer period effects are highly sensitive to the presence of sedimentary basins and are included in most current ground motion models (GMMs)
- [Lessons for Tsunami and Earthquake Resilience from Hurricanes Irma and Maria in the Northeastern Caribbean](https://www.seismosoc.org/presentations/lessons-for-tsunami-and-earthquake-resilience-from-hurricanes-irma-and-maria-in-the-northeastern-caribbean/) - In September 2017 the Northeastern Caribbean was battered by two Category 5 hurricanes, Irma and Maria. While Irma’s destructive forces were most devastating to Antigua & Barbuda, Anguilla, the British Virgin Islands, the Northern US Virgin Islands, Maria completed the destruction of the region with its fury focusing on Dominica, St. Croix (USVI) and Puerto
- [Intraslab Morelos-Puebla, Mexico, Earthquake of 19 September 2017 (mw7.1): Ground Motion and Damage Pattern in Mexico City](https://www.seismosoc.org/presentations/intraslab-morelos-puebla-mexico-earthquake-of-19-september-2017-mw7-1-ground-motion-and-damage-pattern-in-mexico-city/) - The intraslab earthquake of 2017 was the second most destructive in the history of Mexico City, next only to the interplate earthquake of 1985 (Mw8.0). PGA of 59 gal at the SM station of CU, located on basalt lava flows and in continuous operation since 1964, was the largest ever, twice the PGA during the
- [Analysis of the 19 September 2017 (Mw=7.1) Mexico Earthquake and Its Aftershock Sequence](https://www.seismosoc.org/presentations/analysis-of-the-19-september-2017-mw7-1-mexico-earthquake-and-its-aftershock-sequence/) - The 19 September 2017 earthquake, which occurred in Central Mexico, caused severe damage to important cities of Central Mexico including Mexico City. Authorities reported that 369 persons were killed by the earthquake (more than 60% in the Mexico City) and hundreds of buildings collapsed or were seriously damaged. Hypocentral location reveals an intermediate-depth earthquake located
- [Earthquake Triggering and Stress Changes in the September 2017 Mexican Earthquake Sequence](https://www.seismosoc.org/presentations/earthquake-triggering-and-stress-changes-in-the-september-2017-mexican-earthquake-sequence/) - Southern Mexico was struck by four earthquakes with Mw > 6 and numerous smaller earthquakes in September 2017, starting with the 8 September Mw 8.2 Tehuantepec Earthquake beneath the Gulf of Tehuantepec offshore Chiapas and Oaxaca. We study whether this M8.2 earthquake triggered the three subsequent large M>6 quakes in southern Mexico to improve understanding
- [Lidar Reveals New Geomorphic Evidence of Shaking and Slip on the Reelfoot Fault in the New Madrid Seismic Zone, Western Tennessee, U.S.A.](https://www.seismosoc.org/presentations/lidar-reveals-new-geomorphic-evidence-of-shaking-and-slip-on-the-reelfoot-fault-in-the-new-madrid-seismic-zone-western-tennessee-u-s-a/) - The New Madrid Seismic Zone (NMSZ) is a major source of intraplate seismicity in eastern North America. Despite a sequence of major (M>7) earthquakes in 1811-1812 in the region, the paleoseismic record and surface expression of faulting is poorly preserved because of extensive agricultural activity and the humid subtropical climate. Recently collected 0.5- and 1-m-resolution
- [Shakemap Based on Instrumental and Macroseismic Data in France: Feedback on Modified v3.5 and Expectation on V4](https://www.seismosoc.org/presentations/shakemap-based-on-instrumental-and-macroseismic-data-in-france-feedback-on-modified-v3-5-and-expectation-on-v4/) - The seismicity of France is moderate in its Metropolitan part and related to a subduction context in its West Indies part. RESIF network (www.resif.fr) and, West Indies (IPGP-OVS) and bordering countries observatories provide us instrumental data. These accelerometric and velocimetric data are available in near real time. The BCSF-RENASS (EOST) provides Intensities, preliminary values are
- [Measurement and Modeling of Ground Motions in Myanmar for Seismic Hazard Assessment](https://www.seismosoc.org/presentations/measurement-and-modeling-of-ground-motions-in-myanmar-for-seismic-hazard-assessment/) - An important first step in assessing the seismic hazard for any region is the selection or development of appropriate ground-motion prediction equations (GMPEs) that adequately describe the expected shaking from a specified earthquake. In this study, we apply the log-likelihood method of Scherbaum et al. (2004) to analyze residuals between predictions from a suite of
- [Introducing a European Integrated Shakemap System](https://www.seismosoc.org/presentations/introducing-a-european-integrated-shakemap-system/) - Strong-motion data dissemination in Pan-Europe is undergoing remarkable improvements. Two new modern strong-motion portals were recently developed within project NERA, mainly based on the European Integrated Waveform Data Archive (EIDA), namely: (a) an automatic peak-motion database (RRSM) that delivers earthquake and peak-motion information within minutes of any event with M >= 3.5; (b) a manually
- [The Two Subduction Zones of the Caribbean-South American Plate Boundary](https://www.seismosoc.org/presentations/the-two-subduction-zones-of-the-caribbean-south-american-plate-boundary/) - The Caribbean-South American (CAR-SA) plate boundary is a complex transform fault system connecting oppositely vergent subduction zones, the Antilles in the east, and a currently locked CAR-SA flat slab subduction zone in the west. Teleseismic P-wave tomography shows both the Atlantic (ATL) and the Caribbean (CAR) plates subducting in opposite directions to transition zone depths
- [The Seismic Strong Motion Array Project (SSMAP) and  September 5, 2012, Mw=7.6 Nicoya, Costa Rica, Earthquake Investigation during 2006-2016](https://www.seismosoc.org/presentations/the-seismic-strong-motion-array-project-ssmap-and-september-5-2012-mw7-6-nicoya-costa-rica-earthquake-investigation-during-2006-2016/) - Seismic gaps along the subduction zones are locations where large earthquakes have not occurred in a long time. These areas are considered locked and are accumulating large amounts of strain energy that will ultimately be released in major earthquake. The Nicoya Peninsula in northwestern Costa Rica was considered a zone with this type of seismic
- [Lg Q Model for Western Tibet](https://www.seismosoc.org/presentations/lg-q-model-for-western-tibet/) - We investigate the Lg wave attenuation characteristics for the Western Tibet using a tomographic regionalization method. A total of 378 regional events of magnitudes (Mb) greater than 4.5, and focal depth less than 50 Km, recorded at 52 stations are considered. The Lg wave attenuation coefficient at 1 Hz (LgQ0) is calculated in the group-velocity
- [Further Development and Testing of ML-MC as a Depth Discriminant at Local Distances](https://www.seismosoc.org/presentations/further-development-and-testing-of-ml-mc-as-a-depth-discriminant-at-local-distances/) - Seismic source discrimination at local distances (< 200 km) is becoming increasingly important within the nuclear monitoring community. A study conducted by Koper et al. (2016) found that the difference between local magnitude (ML) and coda/duration magnitude (MC) could distinguish between mining-induced seismicity and natural seismicity in Utah. They found that the shallower mining-induced earthquakes
- [Discrimination of Anthropogenic Events and Tectonic Earthquakes in Utah Using a Quadratic Discriminant Function Approach with Local-Distance Amplitude Ratios](https://www.seismosoc.org/presentations/discrimination-of-anthropogenic-events-and-tectonic-earthquakes-in-utah-using-a-quadratic-discriminant-function-approach-with-local-distance-amplitude-ratios/) - Most of the commonly used seismic discrimination approaches are designed for regional data. Relatively little attention has focused on discriminants for local distances (< 200 km), the range at which the smallest events are recorded. We take advantage of the variety of seismic sources and the existence of a dense regional seismic network in the
- [MSNoise - Not Only dv/v! (and ObsPy)](https://www.seismosoc.org/presentations/msnoise-not-only-dv-v-and-obspy/) - MSNoise is an Open and Free Python package known to be the only complete integrated workflow designed to analyse ambient seismic noise and study relative velocity changes (dv/v) in the crust. It is based on state of the art and well maintained Python modules, among which ObsPy plays an important role. To our knowledge, it
- [Characteristics of Airplanes and Helicopters Recorded by a Dense Seismic Array near Anza, California](https://www.seismosoc.org/presentations/characteristics-of-airplanes-and-helicopters-recorded-by-a-dense-seismic-array-near-anza-california/) - We observe frequent air-traffic events in continuous seismic waveforms recorded for about 30 days by 1108 vertical geophones in a tight array on the San Jacinto fault zone. The waveforms of the air-traffic events resemble tremor or collections of small earthquakes. However, the time-frequency analysis shows clear Doppler effects that can be modeled with basic
- [A Large-Aperture Distributed Acoustic Sensing Array in Goldstone, California](https://www.seismosoc.org/presentations/a-large-aperture-distributed-acoustic-sensing-array-in-goldstone-california/) - Distributed Acoustic Sensing (DAS) has emerged as an attractive technology to build affordable and scalable dense seismic networks, especially in urban environment with existing telecommunication fibers. However, the instrument response and sensitivity of DAS, as well as effects of coupling, are not fully understood yet for seismological research purposes, especially at frequencies lower than 5Hz
- [Anatomy of Old Faithful from Subsurface Seismic Imaging of Yellowstone National Park, Upper Geyser Basin](https://www.seismosoc.org/presentations/anatomy-of-old-faithful-from-subsurface-seismic-imaging-of-yellowstone-national-park-upper-geyser-basin/) - The Upper Geyser Basin (UGB) in Yellowstone contains one of the highest concentrations of hydrothermal features on Earth including the iconic Old Faithful geyser. Although this area has been the focus of many geological, geochemical, and geophysical studies, the shallow (
- [West Coast Real-Time GPS in Support of Earthquake Early Warning](https://www.seismosoc.org/presentations/west-coast-real-time-gps-in-support-of-earthquake-early-warning/) - Real-time GNSS position streams are desirable for a variety of rapid earthquake charactization applications that include Earthquake Early Warning. We report on our development of a comprehensive real-time GPS-based seismic monitoring system for the western US that includes the San Andreas transform system and Cascadia subduction zone. Our system is based around 1 Hz point
- [Large Earthquake and Tsunami Characterization in Chile Using  High Rate GPS and Strong Motion Data](https://www.seismosoc.org/presentations/large-earthquake-and-tsunami-characterization-in-chile-using-high-rate-gps-and-strong-motion-data/) - Recent efforts have been made to characterize large earthquakes in real time in Chile. In the last seven years Chile has been struck with 3 large earthquakes (Mw > 8). After the devastating Maule Earthquake, the National Seismological Center started to operate with the aim of monitoring real time events, passing from being an academic
- [Seismic Anisotropy of the Crust and Upper Mantle across the Caribbean-North American Plate Boundary from Shear-Wave Splitting on Haiti](https://www.seismosoc.org/presentations/seismic-anisotropy-of-the-crust-and-upper-mantle-across-the-caribbean-north-american-plate-boundary-from-shear-wave-splitting-on-haiti/) - Hispaniola is situated across the Caribbean-North American plate boundary at a critical point in the transition from oblique subduction in the east to a transform plate boundary in the west. This results in a transpressional stress regime with deformation accommodated by numerous strike-slip, thrust and oblique fault structures that bisect the island. We used teleseismic
- [The Case of Western Corinth Gulf (Greece): A Detachment Zone or Seismic – Aseismic Transition?](https://www.seismosoc.org/presentations/the-case-of-western-corinth-gulf-greece-a-detachment-zone-or-seismic-aseismic-transition/) - Corinth Gulf is one the most seismically active rifts worldwide, with several low in magnitude earthquakes as well as a few stronger ones (M>6), especially in its western part. This study focuses on the spatiotemporal properties of the seismic activity occurred between 2008-2014, when the national seismological network was denser. In this respect, a highly
- [Ground Motion to Intensity Conversion Equations (GMICEs) for Chilean Megathrust Earthquakes](https://www.seismosoc.org/presentations/ground-motion-to-intensity-conversion-equations-gmices-for-chilean-megathrust-earthquakes/) - We determine empirical relationships between instrumental peak ground motions and observed intensities for three recent Chilean megathrust (interplate subduction) earthquakes: the November 14, 2007 Mw 7.7 Tocopilla earthquake, and two great earthquakes, the February 27, 2010 Mw 8.8 Maule earthquake and the April 1, 2014 Mw 8.2 Iquique earthquake. Most great (M > 8) earthquakes,
- [Holocene Surface Rupture on the Salinas Fault and the Southeast Great Southern Puerto Rico Fault Zone and Implication for Seismic Hazard Assessments](https://www.seismosoc.org/presentations/holocene-surface-rupture-on-the-salinas-fault-and-the-southeast-great-southern-puerto-rico-fault-zone-and-implication-for-seismic-hazard-assessments/) - We excavated two trenches across topographic scarps on the Puerto Rico southern coastal plain: one across the west-striking Salinas fault and one across the northwest-striking Great Southern Puerto Rico fault zone (GSPRFZ). For the Salinas fault, topographic scarps are primarily south-facing and extend >22 km along hills several kilometers inland from the coast between Río
- [Improved Focal Mechanisms and Spatial Stress Patterns Pertaining to Shallow Slow Slip in the Northern Hikurangi, New Zealand](https://www.seismosoc.org/presentations/improved-focal-mechanisms-and-spatial-stress-patterns-pertaining-to-shallow-slow-slip-in-the-northern-hikurangi-new-zealand/) - Slow slip events (SSEs) on the northern Hikurangi are commonly associated with increased seismicity rates, yet limited network azimuthal coverage for offshore earthquakes means source properties, such as focal mechanisms, are difficult to constrain. Here, we utilize >20 ocean-bottom seismometers and pressure sensors deployed as part of the Hikurangi Ocean Bottom Investigation of Tremor and
- [Influence of Crustal Structure on High-Frequency (F>1 Hz) Ground Motions from Induced Earthquakes in Oklahoma](https://www.seismosoc.org/presentations/influence-of-crustal-structure-on-high-frequency-f1-hz-ground-motions-from-induced-earthquakes-in-oklahoma/) - We investigate the effects of crustal structure on high-frequency (f>1 Hz) ground motions from induced earthquakes in Oklahoma using recorded waveforms and 1- and 3-D waveform modeling. This work was motivated by previous comparisons of observed response spectral accelerations with the values from ground motion prediction equations (GMPEs) suggesting that the induced ground motions from
- [Seismicity Induced by Hydraulic Fracturing in Ohio](https://www.seismosoc.org/presentations/seismicity-induced-by-hydraulic-fracturing-in-ohio/) - We have investigated seismicity associated with hydraulic fracturing (HF) in Ohio since 2013, which provides an ideal setting for studying the relations between high pressure injection and earthquakes due to isolation from other injection activities. Our analysis using an array of local stations in Harrison County revealed 2 distinct groups: 1) deeper earthquakes in Precambrian
- [Diverse Volumetric Faulting Patterns in the San Jacinto Fault Zone](https://www.seismosoc.org/presentations/diverse-volumetric-faulting-patterns-in-the-san-jacinto-fault-zone/) - We examine locations, magnitudes and faulting types of post-2000 earthquakes in the trifurcation area of San Jacinto fault zone to clarify basic aspects of failure processes in the area. Most M > 3.5 events have strike-slip mechanisms, occur within 1 km of the main faults (Clark, Buck Ridge, and Coyote creek) and have hypocenter depths
- [A Unified Discrete Representation of the Elastic, Viscoelastic, and Poroelastic Interface and Strong Material Heterogeneity in the Finite-Difference Modeling of Seismic Wave Propagation](https://www.seismosoc.org/presentations/a-unified-discrete-representation-of-the-elastic-viscoelastic-and-poroelastic-interface-and-strong-material-heterogeneity-in-the-finite-difference-modeling-of-seismic-wave-propagation/) - Moczo et al. (2002, 2014), Kristek & Moczo (2003) and Kristek et al. (2017) developed the discrete representation of a strong discontinuous and smooth material heterogeneity in the elastic and viscoelastic media suitable for the finite-difference modelling of seismic wave propagation and earthquake ground motion. The representation is capable of sub-cell resolution and “sensing” an
- [Deterministic Waveform Modeling to Aid Gmpe Development in Areas of Induced Seismicity, the Importance of Kinematic Finite Faults](https://www.seismosoc.org/presentations/deterministic-waveform-modeling-to-aid-gmpe-development-in-areas-of-induced-seismicity-the-importance-of-kinematic-finite-faults/) - Ground motion models (GMMs) have historically been used as input in the development of probabilistic seismic hazard analysis (PSHA) and as an engineering tool to assess risk in building design. Generally these equations are developed from empirical analysis of observations that come from fairly complete catalogs of seismic events. One of the challenges when doing
- [Multi-Scale Study of Ground Motion Coherence in Piñon Flats and the San Jacinto Fault Zone](https://www.seismosoc.org/presentations/multi-scale-study-of-ground-motion-coherence-in-pinon-flats-and-the-san-jacinto-fault-zone/) - We study the coherence of one-year continuous waveforms from the Piñon Flats Observatory Array (PY) and five dense linear arrays (JF, DW, SGB, RA, and BB from south to north) along the San Jacinto fault using the multitaper spectral analysis. The examined data include ambient noise and earthquake signals from local and teleseismic sources recorded
- [The Signature of Wind Turbines in Seismic Background Noise](https://www.seismosoc.org/presentations/the-signature-of-wind-turbines-in-seismic-background-noise/) - Seismic and infrasound sensors can record noise from wind turbines (WTs) at distances of several 10s of km from their source. Like other machines with rotating blades, WTs produce noise characterized by a series of sharp spectral peaks centered at the blade-passing frequency and its integer harmonics (F&H noise). We demonstrate a methodology to detect
- [The Preliminary Study of Seismic Microsonation and Seismic Hazard Assessment for Urban Areas of Gori (Georgia)](https://www.seismosoc.org/presentations/the-preliminary-study-of-seismic-microsonation-and-seismic-hazard-assessment-for-urban-areas-of-gori-georgia/) - Seismic risk is a crucial issue for South Caucasus, which is the main gateway between Asia and Europe. The goal of this work is to propose new methods and criteria for defining an overall approach aimed at assessing and mitigating seismic risk in Georgia. Seismic hazard assessment means the identification of zones of similar levels
- [Seismic Microzoning Study in Portoviejo, Ecuador](https://www.seismosoc.org/presentations/seismic-microzoning-study-in-portoviejo-ecuador/) - Portoviejo is located in a sedimentary basin characterized by soft sedimentary deposits of fluvial-marine origin that gradually filled the estuary, surrounded by outcrops of heavily weathered shales. The seismic hazard is dominated by interface earthquakes of the subduction of the Nazca plate beneath the North Andean Sliver, but local faults with potential Q activity were
- [The Mw 7.8 2016 Pedernales, Ecuador Earthquake Aftershock Sequence: a Detailed Spatio-Temporal Analysis of the Rupture Processes, Stress Patterns and Slip Behavior](https://www.seismosoc.org/presentations/the-mw-7-8-2016-pedernales-ecuador-earthquake-aftershock-sequence-a-detailed-spatio-temporal-analysis-of-the-rupture-processes-stress-patterns-and-slip-behavior/) - The epicentral region of the April 16, 2016 Mw 7.8 Pedernales earthquake lies north of the intersection of the Carnegie ridge and the Ecuador subduction zone. This segment has ruptured on decadal time scales in a series of megathrust events, Mw 8.8 (1906), Mw 7.8 (1942), Mw 7.7 (1958), and Mw 8.2 (1979), suggesting that
- [A 6,600-Year Historic and Stratigraphic Record of 9 Giant Megathrust Earthquakes and the Seismic Cycle at the Copper River Delta, Alaska](https://www.seismosoc.org/presentations/a-6600-year-historic-and-stratigraphic-record-of-9-giant-megathrust-earthquakes-and-the-seismic-cycle-at-the-copper-river-delta-alaska/) - The giant Mw 9.2 1964 Alaska earthquake was generated by > 25 m slip on the eastern Aleutian Megathrust that resulted in regional coastal uplift including the Copper River Delta (CRD) that extends 67 km eastward from Cordova along the Gulf of Alaska coast. Coseismic uplift of 2.2 ± 0.2 m in the Alaganic Slough
- [Seismic Gaps and Asperities Along the South American Subduction Zone: An Update](https://www.seismosoc.org/presentations/seismic-gaps-and-asperities-along-the-south-american-subduction-zone-an-update/) - So far this century, six Mw > 7.8 earthquakes have ruptured portions of the subduction zone plate boundary of western South America along Ecuador, Peru, and Chile. Each source region had a history of prior great earthquakes and had not ruptured in recent decades. Their identification as seismic gaps, with the potential to host future
- [Newly Detected, Small Earthquakes to Delineate Fault Heterogeneities in the Cascadia Seismogenic Zone](https://www.seismosoc.org/presentations/newly-detected-small-earthquakes-to-delineate-fault-heterogeneities-in-the-cascadia-seismogenic-zone/) - Great earthquakes, including the M9 event of January, 1700, have repeatedly occurred within the Cascadia Subduction Zone (CSZ) as inferred from paleoseismic studies and tsunami models. To better assess exposure to the next great earthquake here for at-risk populations, there is great interest in estimating downdip rupture extent and the distribution of high moment release
- [How Large Can Megathrust Earthquakes Be in the Central American Subduction Zone?](https://www.seismosoc.org/presentations/how-large-can-megathrust-earthquakes-be-in-the-central-american-subduction-zone/) - The subduction zone in Mexico has unique characteristics as compared to the other subduction zones in the western and eastern Pacific. In Mexico, the scale appears to be a two-to-one size compared to other subduction regimes. The distance from the trench to the coast and the average thickness of the continental lithosphere, above the locked
- [Analysis of the Seismicity in the Los Humeros Mexican Geothermal Field within the Framework of the Consortium Gemex](https://www.seismosoc.org/presentations/analysis-of-the-seismicity-in-the-los-humeros-mexican-geothermal-field-within-the-framework-of-the-consortium-gemex/) - The geothermal field of Humeros Puebla, Mexico, is one of the most important in the country due to its production of 85 Mwh. Previous studies indicate that most of the seismicity is concentrated in two large areas mostly located in the northern part of the field, near the areas of injection and re-injection of fluids
- [Coda Wave Interferometry, Cross-Terms Analysis of EGF at Popocatepetl Volcano, Mexico](https://www.seismosoc.org/presentations/coda-wave-interferometry-cross-terms-analysis-of-egf-at-popocatepetl-volcano-mexico/) - We analyzed seismic noise records in four seismic broadband stations located in the Popocatépetl volcano for 2012-2013 period. The aim is to explore the cross-terms of the Empirical Green Function (EGF) to provide additional information on the structure and strain changes. We obtained hourly correlations as a result of stacking 60 s time windows, which
- [Earthquake Stress Changes before, during, and after the 2015 Eruption at Axial Seamount](https://www.seismosoc.org/presentations/earthquake-stress-changes-before-during-and-after-the-2015-eruption-at-axial-seamount/) - The volcanic eruption in April and May, 2015 of Axial Seamount on the Juan de Fuca Ridge was well documented by geophysical, chemical, and biological sensors as part of the Ocean Observatory Initiative Cabled Array. Seven ocean bottom seismometers located within and along Axial caldera recorded seismicity associated with magmatic processes before, during, and after
- [Active Source Seismic Imaging of the Magmatic Plumbing System beneath Mount St. Helens](https://www.seismosoc.org/presentations/active-source-seismic-imaging-of-the-magmatic-plumbing-system-beneath-mount-st-helens/) - The iMUSH project (imaging Magma Under St. Helens) included a 3D active source seismic experiment consisting of 23 large shots recorded at ~6000 seismograph stations. The experiment included 3 dense linear profiles: Two profiles of 8 shots each were recorded by > 1000 receivers (~150m apart) and strike NW-SE and NE-SW. A third profile of
- [Using SAR Data to Monitor the Dynamics of Ecuadorian Volcanoes](https://www.seismosoc.org/presentations/using-sar-data-to-monitor-the-dynamics-of-ecuadorian-volcanoes/) - The inflation of the ground surface can indicate that magma ascends to shallower levels and that a volcano gets ready for an eruption. These changes can be observed by the use of stacks of SAR images and performing an interferometric time series analysis to obtain the value and rate of displacements. Furthermore, backscatter values analysis
- [Analysis of Reflected Body Wave Phases at the Altiplano-Puna Magma Body near Uturuncu Volcano, Bolivia](https://www.seismosoc.org/presentations/analysis-of-reflected-body-wave-phases-at-the-altiplano-puna-magma-body-near-uturuncu-volcano-bolivia/) - Understanding the upper surface of a magma body is important to determine several features, such as the location of the boundary between country rock and partial melt, the topography along this boundary, the sharpness or gradational nature of the contact, and lateral changes in physical properties along this interface. Investigation of seismic energy reflected from
- [Monitoring Recent Unrest of Sierra Negra Volcano, Galápagos Islands](https://www.seismosoc.org/presentations/monitoring-recent-unrest-of-sierra-negra-volcano-galapagos-islands/) - Sierra Negra volcano is located at the southern portion of Isabela island and exhibits a large caldera (7x9 km). Since 1948, the average eruptive interval time is 11.4 yrs. Using a permanent BB network operated by the Instituto Geofisico, a steady increase in the number and size of earthquakes was detected beginning in Jun 2017.
- [Interpreting Seismic Signals and Processes at Active Volcanic Systems](https://www.seismosoc.org/presentations/interpreting-seismic-signals-and-processes-at-active-volcanic-systems/) - Volcanoes are the sources for a variety of seismic signals, representing different physical processes. A common sequence of events prior to eruptions, the generic volcanic earthquake swarm model (GVESM), provides a unifying framework. First to appear are deep long-period (DLP) events, which may represent fluid injection at depth. From background, high-frequency (HF) events (aka VT
- [Similar Seismicity at Turrialba and Poas, Costa Rica: What Can It Tell Us?](https://www.seismosoc.org/presentations/similar-seismicity-at-turrialba-and-poas-costa-rica-what-can-it-tell-us/) - Repeating seismic events (which have a similar frequency content and waveform shape) have been identified at a number of active volcanoes around the world, including: Redoubt, Alaska; Mt. St. Helens, Washington; Tungurahua, Ecuador; and Soufriere Hills, Montserrat; and appear to be particularly persistent during episodes of volcanic activity. In Costa Rica, we have identified similar
- [Regional Evolution of Coda Waves' Attenuation in the NW South America](https://www.seismosoc.org/presentations/regional-evolution-of-coda-waves-attenuation-in-the-nw-south-america/) - Several studies in some regions of the world have shown during last decades that coda waves’ attenuation may vary as a response to different processes in the Earth interior, e.g. evolution of cracks due to stress variations, migration of fluids, and mobility of magmas. It means, that permanent monitoring of coda waves derived from seismological
- [Seismic Hazard Assessment of the Kashmir Basin, Northwestern Himalaya: A Probabilistic Approach](https://www.seismosoc.org/presentations/seismic-hazard-assessment-of-the-kashmir-basin-northwestern-himalaya-a-probabilistic-approach/) - Northwestern Himalaya is one of the most tectonically active domains of the Himalaya. This complex collisional tectonic setup is able to produce destructive earthquakes, most recent being the 8 October 2005 Kashmir earthquake (Mw 7.6). In this study, we present the probabilistic seismic hazard assessment of the Kashmir basin of northwestern Himalaya. The motivation for
- [A Long-Term Slip Model for the San Ramón Fault, Santiago de Chile, from Tectonically Reconcilable Boundary Conditions](https://www.seismosoc.org/presentations/a-long-term-slip-model-for-the-san-ramon-fault-santiago-de-chile-from-tectonically-reconcilable-boundary-conditions/) - We constructed a 3D boundary elements model simulating subduction of the Nazca plate underneath South America, from 29˚ to 38˚ S, to compute long-term surface deformation and slip rates on crustal faults imbedded in the upper-plate wedge of the Andean orogen. We tested our model on the San Ramón Fault (SRF), a major E-dipping, thrust
- [Uncertainties in Probabilistic Seismic Hazard Analysis: A Case Study from Northern Chile](https://www.seismosoc.org/presentations/uncertainties-in-probabilistic-seismic-hazard-analysis-a-case-study-from-northern-chile/) - We report the results of a probabilistic seismic hazard analysis for Iquique, northern Chile located near the Nazca-South America plate boundary subduction zone. We constructed a seismic source model to characterize the geometry and earthquake activity at the plate interface (0 to 40 km depth) and for the deep subduction zone intraslab sources (40 to
- [Ground Motion in Kuwait from Regional and Local Earthquakes: Potential Effects on Tall Buildings](https://www.seismosoc.org/presentations/ground-motion-in-kuwait-from-regional-and-local-earthquakes-potential-effects-on-tall-buildings/) - In recent years, many countries, including Kuwait and other Gulf states, have been constructing many tall buildings. These tall buildings are especially sensitive to ground shaking due to long period seismic surface waves. Although Kuwait is relatively aseismic, it has been affected by large (Mw > 6) regional earthquakes in the Zagros Fold-Thrust Belt (ZFTB).
- [Exposure of Chilean Tailings to Earthquake Hazards from Potentially Seismogenic Crustal Faults](https://www.seismosoc.org/presentations/exposure-of-chilean-tailings-to-earthquake-hazards-from-potentially-seismogenic-crustal-faults/) - Eighty-two percent of sand tailings dam incidents in Chile since 1915 have been seismically induced, including that which led to the 1965 El Cobre disaster. Subduction earthquakes (magnitudes 7.5+, return periods 10s−100s of years) have been traditionally regarded as representing the principal seismic hazard in the country and characteristically produce moderate, but widespread, damage. In
- [Three-Dimensional Simulation Methodology of  Seismic Wave Propagation and Its Application in Wudu Basin, China](https://www.seismosoc.org/presentations/three-dimensional-simulation-methodology-of-seismic-wave-propagation-and-its-application-in-wudu-basin-china/) - The method widely used for the simulation of seismic wave propagation in three dimensional sedimentary basin is the finite element method combining with viscous-elastic artificial boundary. However, in the finite element method, the boundary surfaces are often limited in regular cases, such as a horizontal free surface, to determine the input wave motion on the
- [Fully Physics-Based PSHA: Coupling RSQSim with Deterministic Ground Motion Simulations](https://www.seismosoc.org/presentations/fully-physics-based-psha-coupling-rsqsim-with-deterministic-ground-motion-simulations/) - Probabilistic seismic hazard analysis (PSHA) is typically performed by combining an earthquake rupture forecast (ERF) with a set of empirical ground motion prediction equations (GMPEs). ERFs have typically relied on observed fault slip rates, scaling relationships, and regional magnitude-frequency distributions to estimate the rate of large earthquakes on pre-defined fault segments. GMPEs, which regress against
- [Repeating Quakes Detected at Moosfluh Rockslide (Valais, Switzerland)](https://www.seismosoc.org/presentations/repeating-quakes-detected-at-moosfluh-rockslide-valais-switzerland/) - Repeating earthquakes are associated with the repeated failure of an asperity surrounded by aseismic slip. These events are interesting because they may provide a way to estimate aseismic slip, and because they offer a repetitive source to track temporal changes in the medium. Similar events have also been observed at the base of glaciers, ice
- [Using Freeze Events to Characterize Two Types of Lake-Generated Seismic Signals](https://www.seismosoc.org/presentations/using-freeze-events-to-characterize-two-types-of-lake-generated-seismic-signals/) - During the winter of 2014, a weak polar vortex brought record cold temperatures to the Midwestern United States, and the Great Lakes reached the highest extent of ice coverage (92.5%) since 1979. This event shut down the generation of seismic signals caused by wind-driven wave action within the lakes (termed “lake microseisms”), giving an unprecedented
- [No Blank Slates: Socio-Technical Systems Theory as a Guiding Principle for Disaster Response and Recovery](https://www.seismosoc.org/presentations/no-blank-slates-socio-technical-systems-theory-as-a-guiding-principle-for-disaster-response-and-recovery/) - On December of 2017, already three months after the disastrous hit of Hurricane Maria to Puerto Rico, the president of the Smart Electric Power Alliance said to two E&E News reporters: "Here we are, sadly, in a position where Puerto Rico is as close to a blank slate as we ever thought realistically would come
- [The Effects of Natural Disasters on the Demand for Education and Outreach in Puerto Rico: Why Now?](https://www.seismosoc.org/presentations/the-effects-of-natural-disasters-on-the-demand-for-education-and-outreach-in-puerto-rico-why-now/) - In September of 2017 Puerto Rico experienced the devastation of two hurricanes, Irma and Maria. On January 10, 2018 a 7.6 Mw earthquake near Honduras promoted the activation of the tsunami advisory for Puerto Rico. These three recent events have changed the life of Puerto Ricans and have raised an urgency to be better prepared
- [Study of the Earthquake of October 06, 2011. in Jujuy and Its Distribution of Aftershock](https://www.seismosoc.org/presentations/study-of-the-earthquake-of-october-06-2011-in-jujuy-and-its-distribution-of-aftershock/) - The seismic deformation in the Andean retro arc zone is characterized by having compressive earthquakes at superficial and intermediate dephts. Examples of these are; the earthquakes of September 13, 1962 in Talavera del Esteco, Salta with a magnitude of 7,0 associated to a maximun intensity of IX in the Modified Mercalli Scale (IMM); the earthquakes
- [Earthquake Source Parameters for Chilean Events for Use in the NGA-Subduction Project](https://www.seismosoc.org/presentations/earthquake-source-parameters-for-chilean-events-for-use-in-the-nga-subduction-project/) - The NGA-Subduction project is currently under development, focusing on analyzing the collected data for different regions affected by subduction-zone earthquakes around the world. As part of this effort, an earthquake-source database has been developed for events with ground motion recordings obtained in Chilean territory. Data from the South American subduction zone, and particularly from Chilean
- [The 2016 Capellades Earthquake and Its Seismic Sequence: Expression of Strike-Slip Faulting in the Volcanic Arc of Costa Rica](https://www.seismosoc.org/presentations/the-2016-capellades-earthquake-and-its-seismic-sequence-expression-of-strike-slip-faulting-in-the-volcanic-arc-of-costa-rica/) - On 30 November 2016 at 18:25 (1st December at 00:25, UTC time) a Mw 5.5 earthquake occurred at 2.7 km depth near the town of Capellades de Alvarado, Costa Rica. It was the main shock of an earthquake sequence including foreshocks and aftershocks, located between the active volcanoes Irazú and Turrialba. This is the most
- [Determination of Focal Mechanisms and Depths of Small Magnitude Local and Regional Earthquakes Recorded by a Sparse Seismic Network](https://www.seismosoc.org/presentations/determination-of-focal-mechanisms-and-depths-of-small-magnitude-local-and-regional-earthquakes-recorded-by-a-sparse-seismic-network/) - Determination of precise focal mechanisms and depths of small magnitude earthquakes using regional network stations is important in order to understand earthquake source processes and seismic hazard. We present a technique that can accurately determine focal mechanisms and depths of small magnitude earthquakes (2.5 < M < 4) using only a few regional seismic stations.
- [Stress Drop Investigation of M>4 Induced Earthquakes in Western Canada Using Empirical Green’s Function Method](https://www.seismosoc.org/presentations/stress-drop-investigation-of-m4-induced-earthquakes-in-western-canada-using-empirical-greens-function-method/) - Stress drop is an important ground-motion parameter as it controls the relative amount of high-frequency energy. We use the Empirical Green’s function (EGF) method to determine the stress drops of three earthquakes in Alberta, Canada, linked to hydraulic fracturing, with moment magnitudes (M) greater than 4. The EGF method is based on taking the spectral
- [Seismic Swarm Activity in a Non-Volcanic Area –Umm-Lujj, Western Saudi Arabia](https://www.seismosoc.org/presentations/seismic-swarm-activity-in-a-non-volcanic-area-umm-lujj-western-saudi-arabia/) - An unusual, ongoing, earthquake swarm is currently active in a non-volcanic area in western Saudi Arabia near the town of Umm-Lujj. Since February 2017, hundreds of earthquakes have been recorded continuously, with a maximum magnitude reaching MI 3.7. Although this earthquake swarm occurs only about 75 km NW of the volcanic area of Harrat Lunayyir,
- [Comparison of Brune-Type Stress Drops Obtained from the Improved Coda-Q Method and Spectra Decomposition Method](https://www.seismosoc.org/presentations/comparison-of-brune-type-stress-drops-obtained-from-the-improved-coda-q-method-and-spectra-decomposition-method/) - Analysis of the seismograms recorded by the seismic station array provides the fundamental information of earthquake source spectra and site effects. Previous studies use different sections of the seismograms, e.g. the direct P and S waves and coda waves, to study the two terms. Both stress drops derived from the source spectra and site effects
- [Systematic Observations of the Slip-Pulse Properties of Large Earthquakes](https://www.seismosoc.org/presentations/systematic-observations-of-the-slip-pulse-properties-of-large-earthquakes/) - In earthquake dynamics there are two end member models of rupture: propagating cracks and self-healing pulses. These arise due to different properties of ruptures and have implications for seismic hazard; rupture mode controls near-field strong ground motions. Past studies favor the pulse-like mode of rupture, however, due to a variety of limitations, it has proven
- [Seismic Source Parameters Inversion for Earthquakes in Bardarbunga Volcano for the  Current Seismicity and the 2014-2015 Caldera Collapse Related Events](https://www.seismosoc.org/presentations/seismic-source-parameters-inversion-for-earthquakes-in-bardarbunga-volcano-for-the-current-seismicity-and-the-2014-2015-caldera-collapse-related-events/) - Volcanic earthquakes are controlled by a wide range of physical parameters. The relative importance of such parameters, and how they are connected, can be difficult to discern, due to limited observations. However, large eruptions are outstanding opportunities for studying those parameters, since the magnitude seismicity could be unusually large, such as the Holuhraun fissure eruption
- [Variability in Seismic Source Spectra and Stress Drop from Repeating Earthquake Sequences along the Nicoya Peninsula Megathrust](https://www.seismosoc.org/presentations/variability-in-seismic-source-spectra-and-stress-drop-from-repeating-earthquake-sequences-along-the-nicoya-peninsula-megathrust/) - Using template-matching, we identify clusters of repeating events, RE, before and after a megathrust earthquake and analyze temporal and spatial variations in stress drop, SD. An increasing number of observations in different tectonic regimes and laboratory experiments have revealed conflicting answers about whether earthquake SD scales with magnitude. In theory measuring SD should be simple,
- [The Virginia City, Nevada, Earthquake Sequence: Exploring Complexities in Source Properties of Small Events (M ~3) and Fault Geometry](https://www.seismosoc.org/presentations/the-virginia-city-nevada-earthquake-sequence-exploring-complexities-in-source-properties-of-small-events-m-3-and-fault-geometry/) - We attempt a detailed analysis of a small earthquake sequence to reveal how seismicity migrates across complex structures and how stresses change both in space and time, while also exploring mechanisms of driving forces (i.e. aseismic slip, fluid migration). The Virginia City, Nevada earthquake sequence (M
- [Validation of a 3-Stage Source Scaling for Crustal Earthquakes](https://www.seismosoc.org/presentations/validation-of-a-3-stage-source-scaling-for-crustal-earthquakes/) - Source scaling is a fundamental issue to understand earthquakes. A magnitude and log area (M-logA) relation is a key scaling to link modeling of seismic source and ground motion. Currently, scenario seismic hazard maps in Japan adopt a 3-stage M-logA scaling for crustal earthquakes, although many national seismic hazard maps use a linear or bilinear
- [Earthquake Early Warning: The Road to Implementation](https://www.seismosoc.org/presentations/earthquake-early-warning-the-road-to-implementation/) - The Pacific Gas and Electric Company (PG&E) is actively participating in the implementation of earthquake early warning (EEW) technology in California. Pilot projects at PG&E are being used to demonstrate how EEW technology can potentially protect lives, lessen property damage, and ensure rapid service restoration throughout an earthquake impacted area. PG&E’s EEW program currently includes
- [Performance of Seismic and Geodetic Earthquake Early Warnings for a Suite of Large Earthquakes Worldwide: Rapid Forecasts of Ground Motion](https://www.seismosoc.org/presentations/performance-of-seismic-and-geodetic-earthquake-early-warnings-for-a-suite-of-large-earthquakes-worldwide-rapid-forecasts-of-ground-motion/) - GNSS-based earthquake early warning (EEW) algorithms are designed to complement existing point-source seismic systems by estimating fault-finiteness and unsaturated moment magnitude for the largest, most damaging earthquakes. Because large earthquakes are rare and geodetic monitoring is relatively young, however, demonstrating the differential accuracy of ground motion estimates from seismic and geodetic warnings is difficult. Here,
- [Local Tsunami Warnings Using GNSS and Seismic Data](https://www.seismosoc.org/presentations/local-tsunami-warnings-using-gnss-and-seismic-data/) - Tsunami warning Centers (TWC’s) must issue warnings based on imperfect and limited data. Uncertainties increase in the near field, where a tsunami reaches the closest coastal populations to the causative earthquake in a half hour or less. In the absence of a warning, the usual advice is “When the ground shakes so severely that it’s
- [Reducing the False Alert Problem in Earthquake Early Warning: ElarmS Version 3.0](https://www.seismosoc.org/presentations/reducing-the-false-alert-problem-in-earthquake-early-warning-elarms-version-3-0/) - ElarmS is a network-based Earthquake Early Warning System (EEWS) that is currently operating and creating alerts for earthquakes throughout the West Coast of the United States. ElarmS is one of the algorithms contributing to the ShakeAlert EEWS, a prototype system that will begin publishing public alerts in late 2018. In 2013 significant improvements were made
- [Determining Magnitudes of Large Earthquakes in Japan Using Seismic Stations in China](https://www.seismosoc.org/presentations/determining-magnitudes-of-large-earthquakes-in-japan-using-seismic-stations-in-china/) - Rapid determination of earthquake magnitude is of importance for estimating shaking damages, and tsunami hazards. However, due to the complexity of source process, accurately estimating magnitude for great earthquakes in minutes after origin time is still a challenge. A recent example is the 2011 M9.0 Tohoku, Japan earthquake. We developed an approach that was originated
- [Updates on the Finite-Fault Rupture Detector Algorithm (Finder v.2)](https://www.seismosoc.org/presentations/updates-on-the-finite-fault-rupture-detector-algorithm-finder-v-2/) - The Finite-Fault Rupture Detector (FinDer) algorithm provides real-time finite-source models for on-going fault ruptures. The FinDer algorithm determines a line-source model that is best suited to explain the current spatial ground-motion pattern observed at any given time in a dense seismic network. This is done via the cross-correlation of observed ground-motion amplitudes with theoretical templates
- [Determination of Earthquake Early Warning Parameters for the New Madrid Seismic Zone](https://www.seismosoc.org/presentations/determination-of-earthquake-early-warning-parameters-for-the-new-madrid-seismic-zone/) - Increasing vulnerability of metropolitan areas within stable continental regions (SCR), such as Memphis, TN and St. Louis, MO near the New Madrid Seismic Zone (NMSZ), to earthquakes and the very low probability level at which short term earthquake forecasting is possible make an earthquake early warning system (EEWS) a viable alternative for effective real-time risk
- [On Strong Positive Frequency Dependencies of Seismic Quality Factors](https://www.seismosoc.org/presentations/on-strong-positive-frequency-dependencies-of-seismic-quality-factors/) - Many seismic attenuation measurements, and particularly those using local earthquakes and seismic codas, result in large exponents h ≥ 1 in the frequency-dependent quality factor Q(f) = Q0fh. However, such steep positive frequency dependences of Q are highly problematic physically. Specifically, the case of h = 1 corresponds to frequency-independent (elastic) amplitude decays with time
- [An Attenuation Study in the South Region of the Gulf of California, Mexico](https://www.seismosoc.org/presentations/an-attenuation-study-in-the-south-region-of-the-gulf-of-california-mexico/) - We analyzed S-wave recordings from regional stations of the Broadband Seismological Network of the Gulf of California (RESBAN) operated by CICESE (Centro de Investigación Científica y de Estudios Superiores de Ensenada, B.C.) to study the variability of the quality factor Q with depth. We used earthquakes located by Sumy et al. (2013) in the southern
- [A New Model for Vertical-to-Horizontal  Response Spectral Ratios for  Central and Eastern North America](https://www.seismosoc.org/presentations/a-new-model-for-vertical-to-horizontal-response-spectral-ratios-for-central-and-eastern-north-america/) - It is a well-known fact that critical structures are required to be designed for the vertical effect of ground motions as well as the horizontal effects. We present a much-needed new model for the spectral ratio of vertical to horizontal component of earthquakes (V/H ratio) for Central and Eastern North America (CENA). The V/H ratio
- [Lg Attenuation in Oklahoma and Its Surrounding Regions](https://www.seismosoc.org/presentations/lg-attenuation-in-oklahoma-and-its-surrounding-regions/) - Increased seismicity in the Oklahoma and surrounding regions since 2008 and the passing of the EarthScope USArray through the region provides an opportunity to better define Lg attenuation in that region. Initial tomography results at 1 Hz by Gallegos et al. (2014) and a study of the location of the boundary between mid-continental low attenuation
- [Kappa Effects on Hard-Rock Ground Motions: An On-Going Research](https://www.seismosoc.org/presentations/kappa-effects-on-hard-rock-ground-motions-an-on-going-research/) - Existing ground-motion models for the central and eastern United States (CEUS) are commonly developed for hard-rock site conditions using the omega-squared point-source earthquake model (Brune, 1970; 1971) and the kappa-scaling site attenuation relation (Anderson and Hough, 1984). This approach describes a large increase in the high frequency (> 10 Hz) ground motions at hard-rock sites
- [Investigating Basin Amplification Factors for Shaking in the Reno, Nevada, Region for Local and Regional Events](https://www.seismosoc.org/presentations/investigating-basin-amplification-factors-for-shaking-in-the-reno-nevada-region-for-local-and-regional-events/) - The impacts of seismic shaking on urban basins have been in the news again this past year. Construction projects for tall buildings have been delayed out of concerns that current design standards may not sufficiently account for the shaking amplification that occurs in geologic basins. Building codes in Nevada pertaining to seismic hazard use the
- [Basin Effects in Kathmandu Valley, Nepal, during Strong Ground Motion of 2015 Gorkha Earthquake Using Kinematic Source Model](https://www.seismosoc.org/presentations/basin-effects-in-kathmandu-valley-nepal-during-strong-ground-motion-of-2015-gorkha-earthquake-using-kinematic-source-model/) - Basin effects is the phenomenon where earthquake waves become trapped and reverberate in concave-shaped bedrock depressions filled with soft sedimentary materials. The catastrophic effects of nume­rous earthquakes in the past have been attributed to basin effects, which can strongly affect the amplitude, frequency, and duration of strong ground motion and introduce spatial variability of seismic
- [Which Site Proxy Should We Use in Ground-Motion Models?](https://www.seismosoc.org/presentations/which-site-proxy-should-we-use-in-ground-motion-models/) - The database is compiled from KIKNet Archieve of Japan (kyoshin.bosai.go.jp) with following criteria: shallow crustal events between 2000-2016, recorded within 300km and Mw range is 3.5-7. Time-based average of shear wave velocity profiles up to different depths 10m (VS10), 20m (VS20), 30m (VS30) and 50m (VS50) are computed. Only stations with 200
- [Bedrock Site Conditions and Kappa in Charlevoix, Quebec.](https://www.seismosoc.org/presentations/bedrock-site-conditions-and-kappa-in-charlevoix-quebec/) - The characterization of high-frequency (>10 Hz) ground motions for hard rock sites in Eastern North America is a critical seismic response issue for major infrastructure, particularly nuclear power plants. The diminution of amplitudes with increasing frequency is modeled using kappa (Anderson and Hough, 1984 BSSA), which is a measure of the slope of amplitude decay
- [Low Yield Seismic Source Analysis Using Local and Regional Observations](https://www.seismosoc.org/presentations/low-yield-seismic-source-analysis-using-local-and-regional-observations/) - Low-yield explosion monitoring introduces new challenges to the current approach to estimating source location, magnitude, and discrimination. Small sources require nearby short period observations, which have an increased sensitivity to geologic heterogeneity, poor signal-to-noise ratios, and in many cases are sparse. Local and regional short periods observations from small shallow seismic sources can be dominated
- [Exploring Subtle Temporal Changes in Earthquake Catalogs to Guide Identification of Dynamically Triggered Events](https://www.seismosoc.org/presentations/exploring-subtle-temporal-changes-in-earthquake-catalogs-to-guide-identification-of-dynamically-triggered-events/) - In studies of remote dynamic triggering, the common practice is to be reactionary, in that the impetus is to select a large earthquake and then systematically search for an increase in small earthquakes at remote distances. This approach requires specifying a duration (e.g., 5, 12, 24 hrs) used to search for seismicity rate changes. Rarely
- [Optimization of Data Functionals for Full-3D Tomography by Seismogram Decomposition and Resynthesis](https://www.seismosoc.org/presentations/optimization-of-data-functionals-for-full-3d-tomography-by-seismogram-decomposition-and-resynthesis/) - Full three-dimensional tomography (F3DT) is a computationally intensive methodology for imaging the Earth structure through the iterated assimilation of waveform data into 3D models of seismic wave propagation. F3DT performance is strongly determined by data resolution, often limited by the ability to identifying coherent seismic phases, measuring the phase and amplitude spectra, and modeling the
- [Analysis of the Ground Motions of the September 7th and 19th 2017 Tehuantepec and Puebla-Morelos Earthquakes](https://www.seismosoc.org/presentations/analysis-of-the-ground-motions-of-the-september-7th-and-19th-2017-tehuantepec-and-puebla-morelos-earthquakes/) - We examine the observed ground motions from the 2017 M8.2 Tehuantepec and M7.1 Puebla-Morelos earthquakes and their relations to predicted ground motions. These two events were both deep (>50 km), inslab, normal-faulting events that caused significant damage to various regions of Mexico and with respect to megathrust events represent comparatively small but non-trival components of
- [Development of a 3D Seismic Velocity Model of the Bengal Basin and Adjacent Regions](https://www.seismosoc.org/presentations/development-of-a-3d-seismic-velocity-model-of-the-bengal-basin-and-adjacent-regions/) - Seismic velocity models are becoming increasingly important due to their use in simulation, and other applications in seismology and engineering. We describe the development of a three-dimensional seismic velocity model for the Bengal basin, covering Bangladesh and the neighboring regions of India and Myanmar. The model encompasses an area of 760 x 780 km2. It
- [Tomographic Imaging of the Central California Crust with Multiple Methods](https://www.seismosoc.org/presentations/tomographic-imaging-of-the-central-california-crust-with-multiple-methods/) - Following the discovery of the Shoreline Fault along the coast of central California by Hardebeck (2010) and the occurrence of the tsunami disaster at the Fukushima nuclear power plant in 2011, there has been increased attention on the potential seismic hazards of the central California region in relation to the Diablo Canyon nuclear power plant.
- [Jizhaigou ms7.0 Earthquake High-Frequency Ground Motion Simulation and Zhangzha Town Intensity Estimation](https://www.seismosoc.org/presentations/jizhaigou-ms7-0-earthquake-high-frequency-ground-motion-simulation-and-zhangzha-town-intensity-estimation/) - Jiuzhaigou occurred Ms7.0 earthquakes which caused serious human and economic losses. We simulated the strong ground motion characteristic using the Empirical Green Function Method. We also estimated the ground motion intensity of Zhangzha town which lost earthquake record data. All the stations are within the scope of around 100 km and all the stations' PGA
- [Evaluating inversion techniques for soft sites in Windsor, Ontario, Canada](https://www.seismosoc.org/presentations/evaluating-inversion-techniques-for-soft-sites-in-windsor-ontario-canada/) - This paper will illustrate a joint inversion analysis of the ambient noise data collected at six soft sites in Windsor, Ontario, Canada, using two different joint inversion methods. We also have geotechnical (borehole and CPT) data near the sites for verifying the applicability of these methods. For both the methods we will take fundamental mode
- [2-D Modeling of the Crustal Structure of Merida Andes, Venezuela, from Wide-Angle Seismic and Gravity Studies](https://www.seismosoc.org/presentations/2-d-modeling-of-the-crustal-structure-of-merida-andes-venezuela-from-wide-angle-seismic-and-gravity-studies/) - The Merida Andes (MA) is an orogeny delimiting the Maracaibo block to the west, in response to the subduction of the Caribbean Plate beneath South American continent. 2-D seismic and gravity modeling of the crustal structure of MA was carried out along the profile Central Andes with a length of 380 km from the coast
- [Applications of the Generalized Finite Differences Method in Viscoelastic Media](https://www.seismosoc.org/presentations/applications-of-the-generalized-finite-differences-method-in-viscoelastic-media/) - The meshless generalized finite difference method is applied to solve problems of seismic wave propagation in viscoelastic media, with irregular distribution of nodes. Schemes in generalized finite differences are obtained for the decoupled wave systems P-SV and SH in homogeneous media, and the stability of the schemes is analyzed. These schemes are used to solve
- [Towards Quasi-Automated Estimates of Directivity and Related Source Properties of Small to Moderate Southern California Earthquakes with Second Seismic Moments Using Weighted Stacked EGFs](https://www.seismosoc.org/presentations/towards-quasi-automated-estimates-of-directivity-and-related-source-properties-of-small-to-moderate-southern-california-earthquakes-with-second-seismic-moments-using-weighted-stacked-egfs/) - We develop a method for quasi-automated estimation of directivity, rupture area, duration, and centroid velocity of earthquakes with second seismic moments. The method is applied to small to moderate earthquakes in southern California. P and S phase picks are given by a 1-D ray tracing algorithm and cataloged event locations. These are refined for deconvolution
- [Standardized Seismic Microzoning to Estimate Probabilistic Seismic Hazard in Conurbated Areas of Veracruz State, Mexico.](https://www.seismosoc.org/presentations/standardized-seismic-microzoning-to-estimate-probabilistic-seismic-hazard-in-conurbated-areas-of-veracruz-state-mexico/) - This article summarizes the results obtained from the projects "Seismic threat in the State of Veracruz and the Xalapa Conurbation Zone" and "Microzonification of geological and hydrometeorological hazards for the conurbated zones of Orizaba, Veracruz". These projects were sponsored by the Joint Funds PROMEP and CONACyT-Veracruz state government respectively. In the seismic microzonation study, the
- [Using Aftershock Forecast Modeling to Refine the Location and Magnitude of the 1936 Milton-Freewater Earthquake near the Oregon-Washington Border, U.S.A.](https://www.seismosoc.org/presentations/using-aftershock-forecast-modeling-to-refine-the-location-and-magnitude-of-the-1936-milton-freewater-earthquake-near-the-oregon-washington-border-u-s-a/) - Aftershock forecast modeling is an important tool for investigating the locations and magnitudes of historical earthquakes as well as for short-term earthquake forecasting. Although the 16 July 1936 M6 Milton-Freewater earthquake is the largest historical earthquake in eastern Oregon, having been widely felt in eastern Washington, northeastern Oregon, and northern Idaho, its location is uncertain.
- [Study of the May 2016 Seismic Swarm at Rivera Plate Using OBS and Onland Stations](https://www.seismosoc.org/presentations/study-of-the-may-2016-seismic-swarm-at-rivera-plate-using-obs-and-onland-stations/) - The second stage of TsuJal Project includes the study of passive seismic activity in the region of the plate Rivera and Jalisco block by anchoring OBS and densifying the network of seismic stations on land for at least four months. This stage began in April 2016 with the deployment of 25 Obsidian stations with sensor
- [Development of Integrated Accelerographs Using Mems Technology with Efficient Real-Time Data Transmission and Deployment of a Collaborative Seismic Network.](https://www.seismosoc.org/presentations/development-of-integrated-accelerographs-using-mems-technology-with-efficient-real-time-data-transmission-and-deployment-of-a-collaborative-seismic-network/) - Having a dense network of high-resolution accelerometers based in "Feedback" systems in a reasonable amount of time, is crucial for national seismic networks such as the Spanish seismic network IGN. However, this requirement is in conflict with the tight budgets that would made this virtually unreachable. IGN has designed, developed and manufactured integrated and comprehensive
- [Moment Tensor Inversion in an Optimized, Three-Dimensional Seismic Earth's Model](https://www.seismosoc.org/presentations/moment-tensor-inversion-in-an-optimized-three-dimensional-seismic-earths-model/) - The robustness of moment tensor inversion for source characterization relies on the accuracy of the seismic model, and the kind of method used to compute Green's tensor in it. Many moment tensor inversions are based on Green's functions calculated with approximate methods, and are built on 1-D models or ad hoc 3-D averages. Three-dimensional seismic
- [Earthquake Detection and High-Resolution Body-Wave Tomography at Okmok Volcano, Alaska](https://www.seismosoc.org/presentations/earthquake-detection-and-high-resolution-body-wave-tomography-at-okmok-volcano-alaska/) - Okmok Volcano, located on Umnak Island, Alaska, is one of the most active volcanoes in the Aleutian arc. Historically, it has hosted a number of explosive, phreatomagmatic eruptions, resulting in the formation of 15 vents and four post-eruptive cinder cones. To better understand characteristics of the magma reservoir at Okmok and the associated volcanic hazard
- [The mblg 3.9 September 13, 2017, Earthquake on the Virginia-West Virginia Border: A Significant Shock in the Giles County Seismic Zone](https://www.seismosoc.org/presentations/the-mblg-3-9-september-13-2017-earthquake-on-the-virginia-west-virginia-border-a-significant-shock-in-the-giles-county-seismic-zone/) - On September 13, 2017 the USGS NEIC reported a duration magnitude MD 3.2 earthquake at 37.473N 80.703W, depth 18 km near Lindside, West Virginia, close to the Virginia-West Virginia border. The earthquake was felt primarily in Monroe, Mercer and Summers counties, West Virginia and in Giles, Montgomery, Pulaski and Bland counties, Virginia. The maximum intensity
- [Run-up Estimation Using Non-Uniform Stochastic Sources: The South American Subduction Zone](https://www.seismosoc.org/presentations/run-up-estimation-using-non-uniform-stochastic-sources-the-south-american-subduction-zone/) - Throughout history, megathrust earthquakes have produced large tsunamis that have devastated coastal cities in the near and far field. South America hosts one of the largest subduction zones in the world and it is important to study tsunamigenic earthquakes here to forecast and mitigate future catastrophes. We estimate the maximum magnitude of possible earthquakes along
- [Station, Data, and Instrument Analysis of the Cascades Volcano Observatory’s Seismic Network Using Xmax and Other Tools](https://www.seismosoc.org/presentations/station-data-and-instrument-analysis-of-the-cascades-volcano-observatorys-seismic-network-using-xmax-and-other-tools/) - For the seismic community quality waveform data is the starting point to quality seismic locations and research. Therefore, it is imperative that seismic station metadata be correct and up to date, station functionality monitored, and instrument response files be as accurate as possible to ensure that the network data is reliable. Quality and reliability of
- [Cascadia Onshore-Offshore Site Response, Submarine Sediment Mobilization, and Earthquake Recurrence](https://www.seismosoc.org/presentations/cascadia-onshore-offshore-site-response-submarine-sediment-mobilization-and-earthquake-recurrence/) - Local geologic structure and topography may modify arriving seismic waves. The consequent variation in shaking, or ‘site-response’, may affect the distribution of slope-failures and redistribution of submarine sediments. I used seafloor seismic data from the 2011-2015 Cascadia Initiative and permanent onshore seismic networks to derive estimates of site-response, denoted Sn, in low- and high-frequency (0.02-1
- [The 1 May 2017 British Columbia Earthquake Doublet and Implications for Complexity near the Southern End of the Denali Fault System](https://www.seismosoc.org/presentations/the-1-may-2017-british-columbia-earthquake-doublet-and-implications-for-complexity-near-the-southern-end-of-the-denali-fault-system/) - On May 1, 2017, two M6+ earthquakes occurred in northwestern British Columbia separated by about 2 hours. Despite their close distance about 10 km, the two events have different focal mechanisms, with first earthquake featuring a thrust focal mechanism and the second strike slip. Both focal plane solutions are inconsistent with slip on the nearby
- [Unrest at Masaya and Momotombo Volcano, Nicaragua, Investigated with a Temporary Seismic Network](https://www.seismosoc.org/presentations/unrest-at-masaya-and-momotombo-volcano-nicaragua-investigated-with-a-temporary-seismic-network/) - Since the end of 2013, the region around the volcanoes Masaya and Momotombo, which includes Nicaraguans capital Managua, has shown unusually high seismic and volcanic activitiy. On April 10, 2013, a M6.3 earthquake occured near Momotombo volcano followed by intense aftershock activitiy and a migration of seismicity towards Managua. In the following two years, the
- [Sensitivity of Performance-Based Design to Ground Motion Characteristics](https://www.seismosoc.org/presentations/sensitivity-of-performance-based-design-to-ground-motion-characteristics/) - With the introduction of performance-based design, the tools and techniques for seismic design of structures are becoming more advanced and sophisticated. The requirements to account for nonlinear behaviour in performance-based design, construction of more complex structures (e.g., super tall and slender buildings), more accurate structural modelling and analysis tools, more powerful computers, and large amount
- [Real-Time Completeness of the USGS ComCat Earthquake Catalog and Implications for Operational Aftershock Forecasting](https://www.seismosoc.org/presentations/real-time-completeness-of-the-usgs-comcat-earthquake-catalog-and-implications-for-operational-aftershock-forecasting/) - Aftershock forecasts often depend on the characteristics of the ongoing sequence up to the time of the forecast. The observed aftershocks may be used to fit sequence-specific parameters for clustering models and to seed simulations of future aftershocks. However, the catalog magnitude of completeness may be elevated immediately following a large mainshock, due to decreased
- [Advanced Structural Health Monitoring System for U.S. Department of Veterans Affairs Hospital Buildings](https://www.seismosoc.org/presentations/advanced-structural-health-monitoring-system-for-u-s-department-of-veterans-affairs-hospital-buildings/) - In collaboration with the VA, the U.S. Geological Survey has developed structural health monitoring (SHM) software that utilizes vibration inputs to continually analyze and archive the response characteristics of a building in near real-time. The SHM software is built on the Earthworm (EW) system (Johnson et al., 1995), which is an open data processing platform
- [Preliminary Paleoseismology of the Buffalo Bowl Trench Site on the Teton Fault](https://www.seismosoc.org/presentations/preliminary-paleoseismology-of-the-buffalo-bowl-trench-site-on-the-teton-fault/) - The Teton normal fault runs along the eastern base of the prominent Teton range for ~70 km and defines the northeastern margin of the Basin and Range extensional province (Wyoming, USA). The fault has a latest Pleistocene vertical slip rate of ~1–2 mm/yr as indicated by faulted Pinedale glacial surfaces. However, a paleoseismic record of
- [Earthquake Catalog Reconstruction from Analog Seismograms: Application to the Rangely Experiment Microfilms](https://www.seismosoc.org/presentations/earthquake-catalog-reconstruction-from-analog-seismograms-application-to-the-rangely-experiment-microfilms/) - Before the digital era of seismic recordings, decades of seismic data were recorded in analog form and many of these seismograms are still in good condition. Despite the abundance of analog recordings, surprisingly few efforts have been made to analyze them automatically. One common format is the 16 mm Develocorder film, which was traditionally read
- [Tectonic Classification of Earthquakes for Gmpe Selection](https://www.seismosoc.org/presentations/tectonic-classification-of-earthquakes-for-gmpe-selection/) - Tectonic classification of earthquakes is a key component of the USGS Global ShakeMap system because it serves as the basis for the selection of ground motion prediction equations (GMPEs). GMPE selection has a significant impact on the estimated ground motion intensities and therefore downstream USGS products (e.g., PAGER, ShakeCast). The current method of earthquake regionalization
- [Estimation of Seismic Source Recurrence Parameters without Knowledge of Time-Varying Level of Completeness](https://www.seismosoc.org/presentations/estimation-of-seismic-source-recurrence-parameters-without-knowledge-of-time-varying-level-of-completeness/) - The work provides a procedure for estimation of seismic source recurrence parameters (the b-value of the frequency-magnitude Gutenberg-Richter relation, the mean seismic activity rate λ and seismic source characteristic, maximum possible earthquake magnitude mmax) without knowledge of the time-varying level of completeness. A weakness of the classic Aki-Utsu b-value estimator is its heavy dependence on
- [Operational Significance of the Quality of the  Earthquake Source Parameters Listed in the Pacific Tsunami Warning Center's Observatory Messages versus the Tsunami Bulletins That Followed](https://www.seismosoc.org/presentations/operational-significance-of-the-quality-of-the-earthquake-source-parameters-listed-in-the-pacific-tsunami-warning-centers-observatory-messages-versus-the-tsunami-bulletins-that-followed/) - The Pacific Tsunami Warning Center (PTWC) in Honolulu, Hawaii, routinely analyses most earthquakes with a 5.5 or larger magnitude occurring around the world. The PTWC first issues an unofficial observatory message (OM) containing a set of preliminary parameters for these events. When the estimated magnitude crosses the 6.5 magnitude threshold, however, the protocol calls for
- [Seismicity in the Taquari Megafan: Pantanal Basin in Mato Grosso do Sul, Brazil](https://www.seismosoc.org/presentations/seismicity-in-the-taquari-megafan-pantanal-basin-in-mato-grosso-do-sul-brazil/) - Pantanal is a sedimentary basin of quaternary age, located in the Center-West region of Brazil, in the Upper Paraguay River Basin, constituting a seismogenic zone. The physiography of the area is characterized by the presence of fluvial megafans, mostly sandy, modern and associated with fault lines and structural lineaments. The Taquari Megafan is the largest
- [Time-Domain Receiver Function Deconvolution Using Genetic Algorithm](https://www.seismosoc.org/presentations/time-domain-receiver-function-deconvolution-using-genetic-algorithm/) - Receiver Functions (RF) are well know method for crust modelling using passive seismological signals. Many different techniques were developed to calculate the RF traces, applying the deconvolution calculation to radial and vertical seismogram components. A popular method used a spectral division of both components, which requires human intervention to apply the Water Level procedure to
- [Further Validation of a Dynamic Earthquake Model to Produce Realistic Near-Field Ground Motion](https://www.seismosoc.org/presentations/further-validation-of-a-dynamic-earthquake-model-to-produce-realistic-near-field-ground-motion/)
- [Seismic and Infrasound Analysis of Rocket Launches and Explosions at Kennedy Space Center](https://www.seismosoc.org/presentations/seismic-and-infrasound-analysis-of-rocket-launches-and-explosions-at-kennedy-space-center/) - We installed a temporary 3-station seismic-infrasound network at Kennedy Space Center (KSC) in February 2016 to test sensor calibrations and train students in field deployment techniques. Each station featured a broadband 3-component seismometer and a 3-element infrasound array. We recorded 3 rocket launches with this network. In May 2016 the network was scaled back to
- [Seismic Activity Migration in a Strike-Slip Fault of Porto Dos Gaúchos Seismic Zone (Pgsz) - Amazon Craton Brazil](https://www.seismosoc.org/presentations/seismic-activity-migration-in-a-strike-slip-fault-of-porto-dos-gauchos-seismic-zone-pgsz-amazon-craton-brazil/) - Porto dos Gaúchos seismic zone (PGSZ) is already a well-known seismogenic zone in terms of stress regime, fault location and physical dimension. It is located in a Phanerozoic sedimentary basin; such 500 m thickness sediments overlie the crystalline basement of the Amazon Craton - Brazil. Recently we detected 15km away from the PGSZ area, another
- [Differentiating the P and SV Contribution to the Vertical Ground Motions, Using 3D Wave-Propagation Simulations](https://www.seismosoc.org/presentations/differentiating-the-p-and-sv-contribution-to-the-vertical-ground-motions-using-3d-wave-propagation-simulations/) - Vertical ground motions have been traditionally neglected in seismic-hazard analysis, because they were believed to have minor effects on civil structures. Specifically, the vertical site-response and the physical parameters which influence it are still poorly understood. In recently-published vertical GMPEs, the site-response component is still represented only by Vs30. However, several studies have shown that
- [Seismic Structure of the Austral Basin, Patagonia, Using Surface Wave Phase Velocity](https://www.seismosoc.org/presentations/seismic-structure-of-the-austral-basin-patagonia-using-surface-wave-phase-velocity/) - The construction of crustal and uppermost mantle velocity models is a basic and essential subject in seismology because is vital to an understanding of continental tectonics and is often required as a priori information for various geological and geophysical researches. Surface waves phase velocity provides information that is useful in developing shear wave velocity models
- [Seismo-Acoustic Signatures of Industrial Facilities](https://www.seismosoc.org/presentations/seismo-acoustic-signatures-of-industrial-facilities/) - Operating industrial facilities generate mechanical energy that partitions into the air and ground as acoustic and seismic waves, respectively. When recorded in the very near field, as in 100s of meters, these signals display as a series of harmonic signals with their corresponding overtones embedded in broad band noise. The harmonic signals are usually related
- [The 2017 Earthquake Sequence near Sulphur Peak, Idaho](https://www.seismosoc.org/presentations/the-2017-earthquake-sequence-near-sulphur-peak-idaho/) - On 2 September 2017, an Mw 5.3 normal-faulting earthquake occurred in the Intermountain Seismic Belt about 15 km east of Soda Springs, ID, near Sulphur Peak. It was widely felt throughout southeastern Idaho, northern Utah, and western Wyoming, but caused little damage. It appears to be co-located with two earlier seismic sequences, one in 1960
- [Multi-Scale Mantle Structure underneath North America from a New Tomographic Model of Seismic Shear Velocity](https://www.seismosoc.org/presentations/multi-scale-mantle-structure-underneath-north-america-from-a-new-tomographic-model-of-seismic-shear-velocity/) - The USArray has facilitated a revolution in the integration of seismic imaging and geodynamic modeling. We present a whole-mantle, variable resolution, shear-wave tomography model based on newly available and existing seismological datasets including regional body-wave delay times and multi-mode Rayleigh and Love wave phase delays. The dataset of previously published delays contributes ~600,00 S+ body
- [Earthquake Recurrence of the Northern Lesser Antilles Arc: Paleoseismologic Approach](https://www.seismosoc.org/presentations/earthquake-recurrence-of-the-northern-lesser-antilles-arc-paleoseismologic-approach/) - At the Lesser Antilles arc, the American plate subducts under the Carribean plate with a low velocity (2 cm/a). The seismic potential of the northern segment (between Barbuda and Virgin Islands), where no major historic earthquake is recorded, raises many questions. Recent studies show that the area is weakly coupled, suggesting a seismic cycle that
- [Exploring the Relation between Backprojection Images and Earthquake Source Processes](https://www.seismosoc.org/presentations/exploring-the-relation-between-backprojection-images-and-earthquake-source-processes/) - Backprojection (BP) of teleseismic P waves is a widely-used method to image in time and space the evolution of earthquake radiation. Theoretical studies indicate that the high-frequency bursts can be related to abrupt changes in rupture velocity. Furthermore, recent studies propose that the BP results, which exhibit difference in the frequency content, can reflect the
- [Systematic Detections of Microearthquakes and Repeators in Parkfield Long before and after the 2004 M6 Earthquake](https://www.seismosoc.org/presentations/systematic-detections-of-microearthquakes-and-repeators-in-parkfield-long-before-and-after-the-2004-m6-earthquake/) - The Parkfield segment of the San Andreas Fault (SAF) is one of the best instrumented seismic regions, due to the famous Parkfield Earthquake Prediction Experiment (Bakun et al., 2005). As a result, the 2004 Mw6.0 Parkfield earthquake generated a wealth of data to study seismic activity before and after the mainshock. Recently, Shelly (2017) released
- [Upper Crustal Structure of the Ceboruco Volcano (Mexico) Revealed by Ambient Seismic Noise Tomography](https://www.seismosoc.org/presentations/upper-crustal-structure-of-the-ceboruco-volcano-mexico-revealed-by-ambient-seismic-noise-tomography/) - Ceboruco volcano in Nayarit, Mexico, is one of the only historically active volcanoes at the western end of the Mexican volcanic belt. The need to characterize the magma chamber and the hydrothermal system motivated this first seismic tomography of the volcano, with a focus on the upper 15 km of the crust. Seismic interferometry applied
- [Prediction and Separation of Surface Waves into Fundamental Mode and Overtones Based on the Nonlinear Dispersion Measurement](https://www.seismosoc.org/presentations/prediction-and-separation-of-surface-waves-into-fundamental-mode-and-overtones-based-on-the-nonlinear-dispersion-measurement/) - Seismic surface waves are valuable for investigating subsurface structures. However, in many other applications such as in seismic reflection imaging, it is desirable to separate the surface waves from the data. We propose a data-driven approach to predict and separate surface waves from the data based on the nonlinear dispersion measurement. In addition, we can
- [Ambient Noise Tomography of Okmok Volcano, Alaska](https://www.seismosoc.org/presentations/ambient-noise-tomography-of-okmok-volcano-alaska/) - Okmok volcano is a caldera in the Aleutian Arc that has produced at least 11 eruptions over the past century of observation. Between summers 2015 and 2016, we deployed a seismic array of 13 broadband instruments in and around the caldera. This array supplemented Okmok’s 12 permanent seismometers operated by the Alaska Volcano Observatory. Using
- [Structural Architecture of the Western Transverse Ranges and Potential for Large Earthquakes – Trishear Forward Models](https://www.seismosoc.org/presentations/structural-architecture-of-the-western-transverse-ranges-and-potential-for-large-earthquakes-trishear-forward-models/) - Fold-and-thrust belts evolve over time, can produce large-scale faults and potentially accommodate large magnitude earthquakes. The thrust fronts of these structures typically form large fold structures in their hanging walls, and they tend to propagate forward over time to form new thrust fronts. In the Santa Barbara and Ventura region of the Western Transverse Ranges
- [Assessment of Code-Based Vertical Spectrum Functional Forms](https://www.seismosoc.org/presentations/assessment-of-code-based-vertical-spectrum-functional-forms/) - Consideration of vertical seismic design loads is important for long-span structural systems, short-period structures and for some non-structural components in the buildings. To this end, seismic design codes utilize alternative approaches to define vertical design spectrum at different levels of complexity: either as a fraction of horizontal design spectrum or using a separate functional form
- [New Relocated Seismicity Using an Improved Crustal Structure Model in the Eastern Sierras Pampeanas (29°s – 32°s), Andean Retroarc of Argentina](https://www.seismosoc.org/presentations/new-relocated-seismicity-using-an-improved-crustal-structure-model-in-the-eastern-sierras-pampeanas-29s-32s-andean-retroarc-of-argentina/) - We used seismic broadband records from the SIerras Pampeanas Experiment using a Multicomponent BRoadband Array and the Eastern Sierras Pampeanas array to analyze modern shallow seismicity using a new seismic velocity model for the continental crust of the Eastern Sierras Pampeanas (ESP). The ESP, located in the central part of Argentina, more than 700 km
- [Regional 3-D Geophysical Characterization of the Nevada National Security Site](https://www.seismosoc.org/presentations/regional-3-d-geophysical-characterization-of-the-nevada-national-security-site/) - One of the goals of the Source Physics Experiments (SPE) is to gain a better understanding of the generation and evolution of seismic wave types over a range of propagation distances. A fundamental first step in this is to synthesize seismic waves, which requires accurate 3-D earth structural models. We have developed a 3-D local-to-regional
- [Seismic Structure of the Río De La Plata Craton from Surface Wave Tomography](https://www.seismosoc.org/presentations/seismic-structure-of-the-rio-de-la-plata-craton-from-surface-wave-tomography/) - We present the results of a surface wave group velocity tomography study for the Rio de la Plata craton (RPC). This craton represents the oldest Precambrian region of the end of southwest Gondwana in South America. The results were then inverted to estimate crustal and lithospheric thicknesses. Previous studies carried out in South America did
- [Modeling "The Big One": Insights from 2-D Dynamic Rupture Simulations](https://www.seismosoc.org/presentations/modeling-the-big-one-insights-from-2-d-dynamic-rupture-simulations/) - It is not a question of if or why, but of where, how, and when the next Cascadia Subduction Zone (CSZ) megathrust earthquake will impact the Pacific Northwest. Synthetic ruptures from kinematic source models have attempted to account for future CSZ earthquake behavior and illustrate the importance of rupture directivity on ground motion amplification and
- [Temporal Patterns of Earthquakes: Devil’s Staircases and the Possible Causes](https://www.seismosoc.org/presentations/temporal-patterns-of-earthquakes-devils-staircases-and-the-possible-causes/) - Earthquake recurrence interval is a fundamental concept of current earthquake models and a key parameter in earthquake hazard assessments. Whereas much effort has been devoted to estimate and refine the recurrence interval of large earthquakes on various faults, increasing evidence, especially from intracontinental faults, starts to paint a different temporal pattern of earthquakes: clusters of
- [Wave-Driven Ice Shelf Rift Propagation](https://www.seismosoc.org/presentations/wave-driven-ice-shelf-rift-propagation/) - Distant storms, tsunamis, and earthquakes generate waves in floating ice shelves. In several instances, seismic observations have clearly demonstrated a mechanistic link between periods of elevated wave activity and iceberg calving. The detailed mechanical interpretation of observed seismograms is complicated, however, by the existence of numerous types of waves that propagate in the coupled ice--ocean--earth
- [Status of the Collaboratory for the Study of Earthquake Predictability (CSEP) and Prospects for Future Infrastructure Development](https://www.seismosoc.org/presentations/status-of-the-collaboratory-for-the-study-of-earthquake-predictability-csep-and-prospects-for-future-infrastructure-development/) - The Collaboratory for the Study of Earthquake Predictability (CSEP) supports an international effort to conduct and rigorously evaluate earthquake forecasting experiments. CSEP testing centers are now operational in California, New Zealand, Japan, China, and Europe with 442 models currently under evaluation. The California testing center, operated by SCEC, is testing 30-minute, 1-day, 3-month, 1-year, and
- [A High-Precision Continuous Catalogue of Low-Magnitude Earthquakes in the Central Southern Alps, New Zealand](https://www.seismosoc.org/presentations/a-high-precision-continuous-catalogue-of-low-magnitude-earthquakes-in-the-central-southern-alps-new-zealand/) - The Alpine Fault is inferred to be late in its typical ~300-year cycle of M 8 earthquakes based on paleoseismological evidence. The central Southern Alps exhibit the highest deformation and uplift rates along the Alpine Fault. However, levels of contemporary earthquake activity (M≥2) are low when compared to adjacent areas. Compiling a micro-earthquake catalogue for
- [Machine Learning Magnitude Estimate in Earthquake Early Warning Systems](https://www.seismosoc.org/presentations/machine-learning-magnitude-estimate-in-earthquake-early-warning-systems/) - Rapid and precise determination of earthquake magnitude is of critical importance in earthquake early warning systems. A single station magnitude estimate that relies on a single feature of the waveform recorded near the epicenter, may have large uncertainties and may lead to false and missed alarms. In this study we show that, with state-of-the-art machine
- [Subevent Characterization of the 2016 M7.8 Kaikoura Earthquake](https://www.seismosoc.org/presentations/subevent-characterization-of-the-2016-m7-8-kaikoura-earthquake/) - The 2016 Kaikoura, New Zealand, M7.8 earthquake involved complex ruptures on more than a dozen faults, and the first-order pictures depicted by regional and teleseismic data are still in discrepancy. Most models dominated by far-field data show mainly slip on the megathrust interface, while models dominated by near-field data prefer mostly crustal faulting with secondary
- [Seismometer Orientation of the Broadband Network of the Mexican Servicio Sismológico Nacional](https://www.seismosoc.org/presentations/seismometer-orientation-of-the-broadband-network-of-the-mexican-servicio-sismologico-nacional/) - The purpose of this work is to determine the quality of the information obtained from the seismological stations that constitute the Broadband Network of the Mexican Servicio Sismológico Nacional (National Seismological Service, SSN). We estimate the orientation of the seismometer installed at each site of the Broadband Network for different epochs; each epoch is defined
- [Noise and Detection Levels of the Seismic Network of the Mexican Servicio Sismológico Nacional](https://www.seismosoc.org/presentations/noise-and-detection-levels-of-the-seismic-network-of-the-mexican-servicio-sismologico-nacional/) - We estimate the noise levels for sixty-three seismic stations that constitute the Broadband Network of the Mexican Servicio Sismológico Nacional (National Seismological Service, SSN). We analyze the noise median for each month the station has been in operation. In general, the noise level of the broadband network stations is within the noise model by Peterson
- [Seismic and Acoustic Monitoring at Volcán De Colima, Mexico.](https://www.seismosoc.org/presentations/seismic-and-acoustic-monitoring-at-volcan-de-colima-mexico/) - The seismic and acoustic activity of the Colima Volcano is studied and monitored by the Seismic Network of the State of Colima (RESCO), which belongs to the University of Colima. Nine broadband stations around the volcano record seismic activity in real time. Additionally, an acoustic sensor installed by the UNAM near the seismic station of
- [Neotectonics](https://www.seismosoc.org/presentations/neotectonics/) - Sink Holes and New Faults and Fractures in the Iron Quadrangle, Minas Gerais, Caused by Natural Earthquakes 1Antônio Augusto Seabra Gomes Júnior – Fundação Alexander Brandt, 2Marcelo Assumpção – IAG-USP;3Issamu Endo – Escola de Minas de Ouro Preto On April 5, 2014, a series of collapsed sink holes, accompanied by extensive fracturing, appeared in the
- [Seismic and Liquefaction Hazard Maps for Lake County, Northwestern Tennessee](https://www.seismosoc.org/presentations/seismic-and-liquefaction-hazard-maps-for-lake-county-northwestern-tennessee/) - A five-year seismic and liquefaction hazard mapping project for five western Tennessee counties began in 2017 under a Disaster Resilience Competition grant from the U.S. Department of Housing and Urban Development to the State of Tennessee. The project supports natural hazard mitigation efforts in these five counties. The seismic hazard maps for Lake County in
- [Zland 3C 5Hz Node Test Results](https://www.seismosoc.org/presentations/zland-3c-5hz-node-test-results/) - The IRIS/PASSCAL Instrument Center currently has a small pool of FairfieldNodal Zland 3C 5Hz nodes for community use. In an effort to further refine our best practices for node installation, we have conducted several tests designed to elucidate how PIs can minimize the time needed for node installation while also maximizing data quality and data
- [Impact of Improved Gulf Coast Seismic Attenuation Boundary and Stress Parameter Estimates on Our Understanding of Seismic Hazard in the Southeastern United States](https://www.seismosoc.org/presentations/impact-of-improved-gulf-coast-seismic-attenuation-boundary-and-stress-parameter-estimates-on-our-understanding-of-seismic-hazard-in-the-southeastern-united-states/) - Recently published studies of the seismic attenuation (Q) boundary and stress parameter estimates for the Gulf Coast and southeastern U.S. (SEUS) improve our understanding of seismic hazard for the SEUS. First, the improved Gulf Coast Q boundary location indicates a more restricted region of high attenuation in the SEUS than previous studies that were based
- [Assessing the Applicability of Ground-Motion Models for Induced Seismicity Application in Central and Eastern North America](https://www.seismosoc.org/presentations/assessing-the-applicability-of-ground-motion-models-for-induced-seismicity-application-in-central-and-eastern-north-america/) - This study aims to present a relatively short list of interim induced proxy ground motion models (GMMs) suitable for induced seismicity application in central and eastern North America (CENA). Induced proxy GMMs are models not established from datasets strictly made of induced events but can be used to predict ground motions from such events. For
- [Meeting the Requirements of Early Warning Systems in Real-Time GNSS Operations](https://www.seismosoc.org/presentations/meeting-the-requirements-of-early-warning-systems-in-real-time-gnss-operations/) - UNAVCO streams data from ~800 real-time, GNSS sites (RT-GNSS) from a combination of NSF-sponsored networks that together span large segments of the North American-Pacific plate boundary, the EarthScope Plate Boundary Observatory (PBO), the Caribbean plate boundary (COCONet) and Mexico’s Pacific plate boundary (TLALOCNet). Raw data streams are transmitted from the remote GNSS sites to UNAVCO’s
- [Toward an Automatic Recognition System Based on Machine Learning Techniques at Cotopaxi Volcano](https://www.seismosoc.org/presentations/toward-an-automatic-recognition-system-based-on-machine-learning-techniques-at-cotopaxi-volcano/) - Cotopaxi is an active stratovolcano located in Ecuador, which has previously presented 5 eruptive periods since 1533. The aim of this work is to develop an automatic recognition system based on machine learning techniques for both detection and classification of seismic events from Cotopaxi volcano. Our primary goal is an automatic recognition system that may
- [Evolution of Harmonic Tremor Coda Associated to Lp Events Recorded Previous to the January 4th, 2010, Eruption and 2016 Eruptive Cycle at Turrialba Volcano (Costa Rica)](https://www.seismosoc.org/presentations/evolution-of-harmonic-tremor-coda-associated-to-lp-events-recorded-previous-to-the-january-4th-2010-eruption-and-2016-eruptive-cycle-at-turrialba-volcano-costa-rica/) - Turrialba volcano is a 3,440 masl stratovolcano located at the SE end of the Central Volcanic Range of Costa Rica. Since last eruption, 150 years ago, the volcano shows no signs of activity. However, during the 1990s, degassing and seismic activity began to appear and became more conspicuous in the 2000 decade. Prior to the
- [Joint Inversion of Rayleigh Waves Dispersion Curves and Ps-Receiver Functions in Libya for Crustal Thickness and 1D Shear Wave Velocity Model](https://www.seismosoc.org/presentations/joint-inversion-of-rayleigh-waves-dispersion-curves-and-ps-receiver-functions-in-libya-for-crustal-thickness-and-1d-shear-wave-velocity-model/) - The use of a constrained joint inversion approach reduces the effect of noisy data into the inversion, since it make use of physically meaningful bound constraints to regularize the inversion process. In this study, we analyze waveforms data collected from the Libyan seismic network (LNSN) to compute Rayleigh wave dispersion curves and Ps-receiver functions. Rayleigh
- [Underground Explosions in Anisotropic Media: Coupling of Near- and Far-Field Motions and Implications for SPE](https://www.seismosoc.org/presentations/underground-explosions-in-anisotropic-media-coupling-of-near-and-far-field-motions-and-implications-for-spe/) - The Source Physics Experiment (SPE) is an ongoing effort to improve explosion monitoring by conducting a controlled series of chemical explosions at the Nevada National Security Site (NNSS) and using the resulting observations to improve and validate physics-based simulations of explosion phenomena. Phase I of SPE was conducted on the Climax Stock granite which contains
- [Spectral Analysis for Characterizing Microseisms Produced in the Cotopaxi Volcano](https://www.seismosoc.org/presentations/spectral-analysis-for-characterizing-microseisms-produced-in-the-cotopaxi-volcano/) - Ecuador is a zone of high volcanic seismicity, in such sense it is important to recognize the behavior of volcanoes before they enter into an eruption process. This requires the analysis and to identification of different types of seismic events from a volcano. Cotopaxi volcano, is one of the most active and it has high
- [Crowd Sourcing Data Collection to Enhance the Understanding of Ground Truth Events](https://www.seismosoc.org/presentations/crowd-sourcing-data-collection-to-enhance-the-understanding-of-ground-truth-events/) - The inclusion of crowd sourcing based earthquake detection and characterization has proven to be very successful as a first alert in disaster scenarios and to increase coverage for earthquake detection where there are sparse sensor networks. A variety of crowd sourcing applications such as the USGS Twitter Earthquake Detector (TED), University of California Berkeley’s MyShake,
- [Characteristics of the Double Benioff Zones in the Hikurangi Subduction Zone, New Zealand, Based on Nested Regional-Global Seismic Tomography and Waveform Cross-Correlation Relocation](https://www.seismosoc.org/presentations/characteristics-of-the-double-benioff-zones-in-the-hikurangi-subduction-zone-new-zealand-based-on-nested-regional-global-seismic-tomography-and-waveform-cross-correlation-relocation/) - Double Benioff Zones (DBZs) have been previously observed in the Hikurangi trench, New Zealand. The correlation between seismicity and velocity heterogeneities can help understanding of their occurrence. Therefore, seismic tomography is commonly applied to identify the position and extent of the down-going slabs at depth in addition to crustal and upper mantle velocity heterogeneities. Previous
- [Crustal Radial Anisotropy Model along the Polenet-Anet Transect](https://www.seismosoc.org/presentations/crustal-radial-anisotropy-model-along-the-polenet-anet-transect/) - Radial anisotropy, also called transverse radial isotropy, can indicate the dominant orientations of crustal fabrics. Along with isotropic velocities, radial anisotropy is a key component to understand crustal structures and their history. It can be extracted from the discrepancy between Rayleigh and Love wave propagation speed, indicating a difference between vertically polarized shear-wave speed and
- [Frequency-Dependent Crustal Attenuation from Lg-Waves in Alaska](https://www.seismosoc.org/presentations/frequency-dependent-crustal-attenuation-from-lg-waves-in-alaska/) - The increase of station coverage since 2014 due to the presence of the EarthScope USArray (TA) in Alaska provides an opportunity to investigate crustal attenuation in Alaska using Lg-waves.Lg waveforms provide a good measure of apparent attenuation because they propagate as multiple reflected shear waves trapped within the crust. Lg is often the strongest phase
- [Making Realistic Synthetic Seismic Waveforms with Generative Adversarial Networks](https://www.seismosoc.org/presentations/making-realistic-synthetic-seismic-waveforms-with-generative-adversarial-networks/) - Today machine learning is being applied to solve various problems in seismology using large available datasets. In many cases these data have already been analyzed by humans and serve as training or testing datasets. However, for some important problems in seismology we are severely data-limited. In particular, the enormous numbers of free parameters in deep
- [Using Cross-Correlation Methods to Characterize Earthquakes Associated with the Socorro Magma Body](https://www.seismosoc.org/presentations/using-cross-correlation-methods-to-characterize-earthquakes-associated-with-the-socorro-magma-body/) - The Socorro Magma Body (SMB), a thin, sill-like body with a top surface-depth of 19 km situated within the Rio Grande Rift in central New Mexico, is one of the largest recognized continental mid-crustal magma bodies in the world by area. SMB-associated inflation leads to slow regional uplift of a few mm/yr and has been
- [Local-Similarity Based Seismic Event Detection and Location in the Western Alps with a Dense Linear Array](https://www.seismosoc.org/presentations/local-similarity-based-seismic-event-detection-and-location-in-the-western-alps-with-a-dense-linear-array/) - Many recent structural imaging studies involve deployment of dense linear seismic arrays (e.g., HiClimb, CIFALPS) across a target region. These dense arrays can also record many local and regional seismic events that could be used to illuminate fault structures and tectonic processes. Recently Li et al. (2018) developed a local similarity method to detect weak
- [Machine Learning Aspects in the Smartphone Seismic Network](https://www.seismosoc.org/presentations/machine-learning-aspects-in-the-smartphone-seismic-network/) - MyShake is a global smartphone seismic network that harnesses the power of crowdsourcing. It has an Artificial Neural Network (ANN) algorithm running on the phone to distinguish earthquake motion from human activities recorded by the accelerometer on board. Once the ANN detects earthquake-like motion, it sends a 5-min chunk of acceleration data back to the
- [Identifying Changes in Magmatic Activity at Veniaminof Volcano, Alaska, over Multiple Eruptive Cycles via Ambient Noise Interferometry](https://www.seismosoc.org/presentations/identifying-changes-in-magmatic-activity-at-veniaminof-volcano-alaska-over-multiple-eruptive-cycles-via-ambient-noise-interferometry/) - Veniaminof volcano is one of the largest and most active volcanoes in the Aleutian Arc. Recent eruptions include predominantly phreatic events in 2002, 2005, 2006, 2008, 2009, and 2013. We have applied seismic interferometry via ambient noise in order to probe the subsurface of this volcano and determine temporal changes in seismic velocity from pre-
- [The Effect of Small-Scale Random Heterogeneities in Local Surface Sedimentary Structures on Spatial Variability of Earthquake Ground Motion](https://www.seismosoc.org/presentations/the-effect-of-small-scale-random-heterogeneities-in-local-surface-sedimentary-structures-on-spatial-variability-of-earthquake-ground-motion/) - SIGMA, a R&D program of EDF, AREVA, CEA and ENEL in 2011-2015, aimed to obtain robust and stable estimates of the seismic hazard. In the work package focused on estimating the amplification effects of local site conditions on earthquake ground motion (EGM) we numerically investigated potential of typical 2D and 3D surface sedimentary structures to
- [FAULT2SHA Working Group: Linking Faults to Seismic Hazard Assessment](https://www.seismosoc.org/presentations/fault2sha-working-group-linking-faults-to-seismic-hazard-assessment/) - The objective of the Fault to Seismic Hazard Assessment (Fault2SHA) Working Group is to build a community of active fault-related researchers to exchange data, tools and ideas on how to best model faults in seismic hazard assessment in specific tectonic contexts. After a few meetings (Paris 2014, Chieti 2015) and thematic sessions at international conferences
- [Analysis of 3-Component Rotational and Translational Ground Motions from SPE Chemical Explosions, Historical Nuclear Explosions and Earthquakes](https://www.seismosoc.org/presentations/analysis-of-3-component-rotational-and-translational-ground-motions-from-spe-chemical-explosions-historical-nuclear-explosions-and-earthquakes/) - Four co-located 3-component (3-C) Eentec R-1 rotational velocity sensors and Episensor FBA ES-T translational accelerometers were deployed at the Nevada National Security Site to record three Source Physics Experiment (SPE) chemical explosions with yields of 90kg (SPE1), 997kg (SPE2), and 905kg (SPE3) equivalent TNT. The 4 co-located sensors were deployed 1km from ground zero within
- [Complex Seismic Sources for LP Events in Volcanic Environments: Model and Radiation Patterns](https://www.seismosoc.org/presentations/complex-seismic-sources-for-lp-events-in-volcanic-environments-model-and-radiation-patterns/) - Long period (LP) seismicity is direct evidence of magma movement in the plumbing system and, therefore, it has implications for volcanic hazard forecast such as dome collapse. Following classic seismology seismic sources are assumed to involve planar fault surfaces. However, in volcanic plumbing systems there is evidence of more complex geometries which we explore as
- [Finite-Difference Algorithm for 3D Orthorhombic Elastic Wave Propagation](https://www.seismosoc.org/presentations/finite-difference-algorithm-for-3d-orthorhombic-elastic-wave-propagation-2/) - A more realistic representation of the geologic subsurface assumes the rock behaves as an orthorhombic elastic medium as opposed to an isotropic elastic medium, which is commonly done. An orthorhombic medium is characterized by three mutually orthogonal symmetry planes comprising a dense system of vertically-aligned microfractures superimposed on a finely-layered horizontal geology. Mathematically, the elastic
- [Finite-Difference Algorithm for 3D Orthorhombic Elastic Wave Propagation](https://www.seismosoc.org/presentations/finite-difference-algorithm-for-3d-orthorhombic-elastic-wave-propagation/) - A more realistic representation of the geologic subsurface assumes the rock behaves as an orthorhombic elastic medium as opposed to an isotropic elastic medium, which is commonly done. An orthorhombic medium is characterized by three mutually orthogonal symmetry planes comprising a dense system of vertically-aligned microfractures superimposed on a finely-layered horizontal geology. Mathematically, the elastic
- [A New Seismic Hazard Model for Mainland China](https://www.seismosoc.org/presentations/a-new-seismic-hazard-model-for-mainland-china/) - We are developing a new seismic hazard model for Mainland China by integrating historical earthquake catalogs, geological faults, geodetic GPS data, and geology maps. To build the model, we construct an Mw-based homogeneous historical earthquake catalog spanning from 780 B.C. to present, create fault models from active fault data, and derive a strain rate model
- [One-Year Hazard Models, Their Performance and Uncertainties](https://www.seismosoc.org/presentations/one-year-hazard-models-their-performance-and-uncertainties/) - Beginning in 2016, the USGS started to produce one-year PSHA models to account for the elevated seismicity in this region mainly due to the wastewater injection. We assess the full 2016 model by comparing the model forecast with the observed instrumental ground motions in PGA and spectral response acceleration for 1hz and 5Hz over the
- [Honduras Tsunami Evacuation Maps, Plans, Procedures (Tempp)](https://www.seismosoc.org/presentations/honduras-tsunami-evacuation-maps-plans-procedures-tempp/) - The TEMPP project in Honduras was a project designed to start from scratch until it created the local and regional capacities needed to prepare coastal communities for tsunami events. Two communities were chosen for this project, the community of Sambo Creek on the coast of the Caribbean Sea in northern Honduras and the community of
- [Intraplate Stress Field in South America Derived from Earthquake Focal Mechanisms](https://www.seismosoc.org/presentations/intraplate-stress-field-in-south-america-derived-from-earthquake-focal-mechanisms/) - We present an updated compilation of earthquake focal mechanisms (FM) in Brazil together with the sub-Andean region through more obtained solutions together with published results from the literature and international agencies catalogs. Stress orientations from breakouts and in-situ measurements were also compiled. For Brazil, we have 88 earthquakes with the FM determined since 1978. They
- [Interdisciplinary Seismotectonic Analysis in the Broken Foreland  of the NW Argentine Andes](https://www.seismosoc.org/presentations/interdisciplinary-seismotectonic-analysis-in-the-broken-foreland-of-the-nw-argentine-andes/) - The extensive spatial impact of the ongoing orogenesis in the south central Andes leads to significant recent tectonic activity in great distance to the driving forces of the plate boundary. The complex multi-stage evolution of the Santa-Bárbara-System morpho-strucural province in the foreland of the NW Argentine Andes comprises reactivated inherited structures as well as Quaternary
- [Geophysical Imaging of a Near-Surface Fault System at Billecocha High Plateau, Ecuador](https://www.seismosoc.org/presentations/geophysical-imaging-of-a-near-surface-fault-system-at-billecocha-high-plateau-ecuador/) - Refraction seismic profiles and Ground Penetration Radar (GPR) lines were acquired at Billecocha´s High Plateau (BHP), Imbabura-Ecuador, to visualize a fault zone at the near-surface. The faults present at BHP occur about 4000 meters above sea level (masl) in a nature reserve in an area four km wide by ten km long. The processes responsible
- [Initial Aftershock Locations of the September 2017 Tehuantepec, Mexico, (m=8.2) Earthquake from a Temporary Seismic Network](https://www.seismosoc.org/presentations/initial-aftershock-locations-of-the-september-2017-tehuantepec-mexico-m8-2-earthquake-from-a-temporary-seismic-network/) - The September 7 Tehuantepec, Mexico (M=8.2) and the September 19 Morelos-Puebla, Mexico (M=7.1) earthquakes ruptured with extensional faulting within the Cocos Plate at ~70-km and ~50-km depth, respectively, as it subducts beneath the continental North American Plate. Both earthquakes caused significant damage and loss of life. These events were followed by a M=6.1 extensional earthquake
- [Crustal Structure in the Dominican Republic from Receiver Function Analysis](https://www.seismosoc.org/presentations/crustal-structure-in-the-dominican-republic-from-receiver-function-analysis/) - The Dominican Republic (DR) comprises the eastern two-thirds of the island of Hispaniola, which is located on the Caribbean-North American plate boundary. Geological studies have led to a description of the shallow structure and stratigraphy of the island but little is known about the lower crust and mantle due to a dearth of broadband seismic
- [A Hybrid Empirical Ground Motion Model for the Island of Hawaii](https://www.seismosoc.org/presentations/a-hybrid-empirical-ground-motion-model-for-the-island-of-hawaii/) - The main purpose of this study is to develop a new Ground Motion Model (GMM) for the island of Hawaii using the hybrid empirical method (HEM). The HEM uses stochastically simulated Ground Motion Intensity Measures (GMIMs) in the host and target regions to develop adjustment factors that are applied to empirical GMIM predictions in the
- [Constraints from 3D Earthquake Location for Aftershocks of the  Mw=7.8 2016 Pedernales Earthquake (Ecuador Subduction Zone)](https://www.seismosoc.org/presentations/constraints-from-3d-earthquake-location-for-aftershocks-of-the-mw7-8-2016-pedernales-earthquake-ecuador-subduction-zone/) - The Mw7.8 Pedernales earthquake is associated with the subduction of the Nazca Plate beneath the South American Plate. The mainshock caused many casualties and widespread damages across the Manabi province. The 150 km-long coseismic rupture area is found beneath the coastline, near 25 km depth. The rupture propagated southward and involved the successive rupture of
- [Hybrid Empirical Ground-Motion Prediction Equations for the Gulf Coast Region](https://www.seismosoc.org/presentations/hybrid-empirical-ground-motion-prediction-equations-for-the-gulf-coast-region/) - The main purpose of this study is to develop ground motion prediction equations (GMPEs) for the Gulf Coast region of the United States using a hybrid empirical method (HEM). This project contributes toward development of a new set of GMPEs for the Gulf Coast region, which will be consistent with the available recordings. This research
- [The 2018 Working Group on Nevada Seismic Hazards:  Future Directions for Improvement of the National Seismic Hazards Map in Nevada](https://www.seismosoc.org/presentations/the-2018-working-group-on-nevada-seismic-hazards-future-directions-for-improvement-of-the-national-seismic-hazards-map-in-nevada/) - The Nevada Bureau of Mines and Geology and the Nevada Seismological Laboratory convened the Working Group on Nevada Seismic Hazards in February 2018. The purpose of the workshop was to review ongoing earthquake hazard research in Nevada, provide insight and advice regarding technical issues related to earthquake hazards, and to identify priorities for future research
- [Speeding Up and Boosting Tsunami Warning Alerts in Chile](https://www.seismosoc.org/presentations/speeding-up-and-boosting-tsunami-warning-alerts-in-chile/) - Chile host a great tsunamigenic potential along its coast, even with the large earthquakes occurred during the last decade, there is still a large amount of seismic energy to release. This permanent feature and the fact that the distance between the trench and the coast is just 100 km creates a difficult environment to do
- [Bayesian Uncertainty Quantification and Sensitivity Analysis of PSHA Results](https://www.seismosoc.org/presentations/bayesian-uncertainty-quantification-and-sensitivity-analysis-of-psha-results/) - Many inputs in the calculation of probabilistic seismic hazard analysis are known only with considerable uncertainty. Thus, it is important to capture the range of uncertain inputs in the PSHA results. This requires repeated hazard calculations with different sets of input parameters. It is also of interest which of the uncertain inputs have the greatest
- [The Diploma in Seismology for High-School Teachers](https://www.seismosoc.org/presentations/the-diploma-in-seismology-for-high-school-teachers/) - The high school Physics programs in Mexico do not consider the immediate application of the concepts learned by the students. According to some pedagogical theories, most of the acquired knowledge is assimilated when experimenting and developing projects. It is in high school when young people are exploring for experiences to decide the area in which
- [Selection of Ground Motion Models for Probabilistic Seismic Hazard Analysis in Iran](https://www.seismosoc.org/presentations/selection-of-ground-motion-models-for-probabilistic-seismic-hazard-analysis-in-iran/) - Ground motion models (GMMs) are the most essential component of probabilistic seismic hazard analysis (PSHA), in which their validity is basically dependent on the sufficiency of the data. The quality and quantity of the recorded data have increased over the last couple of decades; however, even for the best-investigated regions (e.g., Western North America), the
- [Using GeoGateway to Reveal Fracture-Advancing Step Tectonics following the 2010 mw7.2 El Mayor-Cucapah Earthquake](https://www.seismosoc.org/presentations/using-geogateway-to-reveal-fracture-advancing-step-tectonics-following-the-2010-mw7-2-el-mayor-cucapah-earthquake/) - GeoGateway is a web-based science gateway that allows UAVSAR interferometric synthetic aperture radar data to be analyzed in the context of other geophysical, geologic, and geodetic data sources. We applied GeoGateway tools to measure crustal deformation surrounding the Yuha desert to characterize fault slip and broader deformation following the 4 April 2010 Mw7.2 El Mayor
- [Earthquake-Induced Landslides Estimates Based on Ground Motion Parameter Maps for Central Mexico](https://www.seismosoc.org/presentations/earthquake-induced-landslides-estimates-based-on-ground-motion-parameter-maps-for-central-mexico/) - We present a hybrid physics- and GMPE-based method to generate Ground Motion Parameter Maps (GMPM) together with landslides estimates due to earthquakes in Central Mexico. The maps are computed using Ground Motion Prediction Equations (GMPEs) and 3D simulations including topographic and realistic crustal models using the Finite Element Method to high and low frequencies, respectively.
- [GPS2EW: A Python Class That Can Be Used to Transmit GNSS Data to an Earthworm System](https://www.seismosoc.org/presentations/gps2ew-a-python-class-that-can-be-used-to-transmit-gnss-data-to-an-earthworm-system/) - The implementation of GNSS data at seismic networks has shown to be a critical addition to earthquake and tsunami monitoring as demonstrated by events such as the 2011 Tohoku earthquake. Currently, seismic networks are seeking methodologies to integrate real-time GNSS data into normal operations to strengthen earthquake and tsunami early warning systems. To be an
- [Estimating the Locations of Past and Future Large Earthquake Ruptures Using Recent M4 and Greater Events](https://www.seismosoc.org/presentations/estimating-the-locations-of-past-and-future-large-earthquake-ruptures-using-recent-m4-and-greater-events/) - A study of the occurrences of recent M≥4 earthquakes in California shows that these events occur preferentially at the edges of past major ruptures, with the effect lessening with decreasing magnitude below M4. Prior to several large California mainshocks, the M≥4 seismicity was uniformly spread along the future fault ruptures without concentrations at the fault
- [Estimating Fatalities Associated with Seismically Induced Landslides](https://www.seismosoc.org/presentations/estimating-fatalities-associated-with-seismically-induced-landslides/) - Earthquake-induced landslides cause a significant portion of earth­quake-related fatali­ties and economic losses, and can have long-lasting negative societal impacts. We present a method to estimate the impact of seismically induced landslides on affected populations using the output of the USGS near-real-time earthquake products. Using a newly developed, comprehensive dataset of 196 historical earthquakes, including 127
- [Seismic Observations Following the July 2017 Pasco County, West Florida, Sinkhole Collapse](https://www.seismosoc.org/presentations/seismic-observations-following-the-july-2017-pasco-county-west-florida-sinkhole-collapse/) - A sinkhole collapse on 14 July 2017 destroyed two homes and required evacuation of 9 additional residences in Land O’Lakes, Florida. The sinkhole formed rapidly and within 10 hours reached most of its final size of approximately 40 by 50 m and a maximum depth of about 15 m. According to Pasco County officials, this
- [Temporal Variations in Seismic Anisotropy during the 2014 Gisborne SSE, New Zealand](https://www.seismosoc.org/presentations/temporal-variations-in-seismic-anisotropy-during-the-2014-gisborne-sse-new-zealand/) - In October 2014, a 2-week long slow slip event (SSE) occurred near Gisborne at the northern Hikurangi Margin, New Zealand. It was recorded by offshore instruments, deployed by the Hikurangi Ocean Bottom Investigation of Tremor and Slow Slip (HOBITSS) project. This study uses data compiled from May 2014 to July 2015, recorded on 15 HOBITSS
- [An Analysis of Real-Time GNSS Solutions from the M8.2 September 2017 Tehuantepec Earthquake and M7.9 January 2018 Kodiak Earthquake and Implications for Earthquake and Tsunami Early Warning Systems](https://www.seismosoc.org/presentations/an-analysis-of-real-time-gnss-solutions-from-the-m8-2-september-2017-tehuantepec-earthquake-and-m7-9-january-2018-kodiak-earthquake-and-implications-for-earthquake-and-tsunami-early-warning-systems/) - The 2017-09-08 earthquake M8.2 located 98 km SSW of Tres Picos, Mexico and 2018-01-23 M 7.9 earthquake located 280km SE of Kodiak, Alaska are the first great earthquakes to occur within the UNAVCO RT-GNSS footprint, which allows for a rigorous analysis of our dynamic and static processing methods. The need for rapid geodetic solutions ranges
- [Spiral 1.0:  Global Tomography Model of Travel Times and Surface Waves with Transversely Isotropic Crust and Mantle](https://www.seismosoc.org/presentations/spiral-1-0-global-tomography-model-of-travel-times-and-surface-waves-with-transversely-isotropic-crust-and-mantle/) - SPiRaL version 1.0 is a global-scale joint image of shear and compressional wave speeds derived from millions of travel time arrivals and global surface wave dispersion estimates for Rayleigh and Love waves. We incorporate several modeling elements used to construct the previous LLNL-G3D series of models (Simmons et al. 2011; 2012; 2015) including multiple-event relocation
- [New Paleoseismic Data from the Frenchman Mountain Fault, Las Vegas, Nevada](https://www.seismosoc.org/presentations/new-paleoseismic-data-from-the-frenchman-mountain-fault-las-vegas-nevada/) - The Frenchman Mountain fault is an 18-km long, north- and northeast-striking, west-dipping, range-bounding normal fault on the eastern side of the Las Vegas metropolitan area. The fault is expressed along the western flank of Frenchman and Sunrise mountains as a zone of sub-parallel scarps in alluvial fan surfaces, bedrock range front scarps, and shear planes
- [Modeling Tsunami Inundation Effects from a Hypothetical Submarine Landslide from the Arecibo Amphitheater on the Coastal San Juan Metropolitan Area](https://www.seismosoc.org/presentations/modeling-tsunami-inundation-effects-from-a-hypothetical-submarine-landslide-from-the-arecibo-amphitheater-on-the-coastal-san-juan-metropolitan-area/) - The island of Puerto Rico in the northeastern Caribbean is only ~150 km south of the Puerto Rico Trench (PRT). With its earthquake and tsunamigenic potential, the PRT makes the island vulnerable to strong shaking and potentially devastating tsunami waves events. In 2018, there will be exactly 100 years since the last significant earthquake and
- [Clarifying the Velocity Structure of the Yellowstone Volcanic System](https://www.seismosoc.org/presentations/clarifying-the-velocity-structure-of-the-yellowstone-volcanic-system/) - In the past 2.1 million years, the Yellowstone volcanic system has experienced three caldera forming eruptions. The last eruption occurred ~0.63 Ma and released more than 1,000 km3 of material. For scale, the 1980 Mount Saint Helens eruption emitted about 1/1,000th the material of the last Yellowstone eruption. To better understand the distribution of magma
- [Salvus: A High-Performance Software Suite for Full-Waveform Modelling and Inversion](https://www.seismosoc.org/presentations/salvus-a-high-performance-software-suite-for-full-waveform-modelling-and-inversion/) - The continuously increasing power of high-performance computing systems enables the application of full waveform inversion to a growing range of data sets yielding high-resolution images of the subsurface structure. This contribution focusses on methodological and algorithmic advances in Salvus, a comprehensive collection of software packages covering the complete toolchain of time-domain waveform inversion with modules
- [Preserving Seismic Data at the University of Utah Seismograph Stations](https://www.seismosoc.org/presentations/preserving-seismic-data-at-the-university-of-utah-seismograph-stations/) - The primary operational goal of the University of Utah Seismograph Stations (UUSS) is the collection and preservation of ground motion data. In 2007 the State of Utah provided funding for UUSS to design and build out a hardened seismic network. Initially, we took four steps toward realizing this goal: (1) a data center hot site
- [High-Resolution Reflection Imaging of Fractures Using Cross-Dipole Shear Source in a Wellbore](https://www.seismosoc.org/presentations/high-resolution-reflection-imaging-of-fractures-using-cross-dipole-shear-source-in-a-wellbore/) - High-resolution characterization of fractures near a well bore is important for many scientific and engineering applications, ranging from natural gas production to nuclear waste storage. Here, we consider single-well reflection imaging, which uses high-frequency sonic data (kHz) recorded by acoustic logging tools to image geologic features near a borehole. In this single-well imaging survey, a
- [The GNSS Component of the Puerto Rico Seismic Network](https://www.seismosoc.org/presentations/the-gnss-component-of-the-puerto-rico-seismic-network/) - For more than two decades the Puerto Rico - Virgin Islands region has been monitored for crustal deformation using GPS geodesy. This objective was first done through a campaign style network that consisted of a dozen sites collecting one measurement annually during the nineties. Today, fifteen continuously operating GPS sites distributed throughout Puerto Rico and
- [Co-Seismic Slip Distribution Inversion Applied to the Mutata Earthquake, Colombia](https://www.seismosoc.org/presentations/co-seismic-slip-distribution-inversion-applied-to-the-mutata-earthquake-colombia/) - Colombia is located on the South American plate with two zones of subductions, one to the west on the Pacific side (Nazca plate), and one to the North on the Caribbean side (Caribbean plate). This leads to the presence to large and complex fault system within Colombia. On September 14, 2016, a Mw 6.0 earthquake
- [Lithospheric Structure and Tectonic Implications of the Dominican Republic from Local and Teleseismic Tomography](https://www.seismosoc.org/presentations/lithospheric-structure-and-tectonic-implications-of-the-dominican-republic-from-local-and-teleseismic-tomography/) - Oblique convergence between the Caribbean (CAR) and North American (NOAM) plates near Hispaniola and the island’s observed clockwise rotation have led to competing hypotheses to explain its tectonics. Clockwise rotation of Hispaniola could be the result of slab edge push generated by (a) subducting NOAM plate, (b) two subducted lithospheric slabs, one southward-dipping from the
- [Parsing and Transforming Textual Seismic Data Using Parser Generators](https://www.seismosoc.org/presentations/parsing-and-transforming-textual-seismic-data-using-parser-generators/) - One of the most common tasks in seismology is preparing data for analysis, which commonly involves parsing, transforming, and cleaning text data. When data are in tidy formats, like tabular files (e.g. CSV) or other structured files (e.g. JSON or XML), parsing and transforming data can leverage existing tools. When data are semistructured or otherwise
- [Fault Slip Associated with the m5.3 September 2, 2017, Sulphur Peak, Idaho, Earthquake and Aftershock Sequence](https://www.seismosoc.org/presentations/fault-slip-associated-with-the-m5-3-september-2-2017-sulphur-peak-idaho-earthquake-and-aftershock-sequence/) - The M5.3 September 2, 2017 Sulphur Peak, Idaho, earthquake is one of the largest earthquakes in southern Idaho since the M6.9 1983 Borah Peak earthquake. It was followed by a vigorous aftershock sequence for several days thereafter that included four events above M4.5. The coseismic and early postseismic deformation was measured with both InSAR and
- [Inversion of S-Coda and P-Coda for the Prospection of Mud Diapirs in the Sinú Belt, Colombia](https://www.seismosoc.org/presentations/inversion-of-s-coda-and-p-coda-for-the-prospection-of-mud-diapirs-in-the-sinu-belt-colombia/) - The diapirism process in Colombia has generated the mud volcanoes in the Sinú Belt, which extends from the Urabá Gulf to the Barranquilla region, including land and marine areas. Most of these events have been associated with the presence of faults that have allowed the mud to rise to the surface. The implementation of an
- [Influence of Postcritical Reflection and Refraction on SmKS](https://www.seismosoc.org/presentations/influence-of-postcritical-reflection-and-refraction-on-smks/) - Although it is generally thought that the Earth’s outer core is well mixed due to vigorous convection, and is therefore more or less compositionally homogeneous, there are, however, increasing evidence that suggests stratification may exist within the outermost outer core due to the presence of light elements. Recent seismic studies show that top a few
- [Remotely-Triggered Slip in Mexico City Induced by the September 2017 Mw7.1 Puebla Earthquake.](https://www.seismosoc.org/presentations/remotely-triggered-slip-in-mexico-city-induced-by-the-september-2017-mw7-1-puebla-earthquake/) - The September 19th, 2017 Puebla earthquake caused life loss and severe property damage in Mexico City, even though the epicenter was located ~100 km away from the city. Mexico City is built on a thick clay-rich sedimentary sequence and, hence, is susceptible to land subsidence (at rates as high as 350 mm/yr), surface faulting, and
- [Hidden Markov Models (HMM) Applied to Primary Processing of the Seismicity Activity of Nevado Del Huila Volcano, Colombia](https://www.seismosoc.org/presentations/hidden-markov-models-hmm-applied-to-primary-processing-of-the-seismicity-activity-of-nevado-del-huila-volcano-colombia/) - The Automatic Classification program based in the Hidden Markov Models, HMM, was implemented to study the seismic activity of Nevado del Huila volcano (Colombia). This program was adapted by researchers of Granada University – Spain for the recognition of the seismic signals of volcanic origin, and it has been applied successfully to volcanoes like Etna
- [Discerning and Characterizing Induced Seismicity in Texas Using Regional Multistation Template Matching](https://www.seismosoc.org/presentations/discerning-and-characterizing-induced-seismicity-in-texas-using-regional-multistation-template-matching/) - To better characterize seismicity in Texas over the past 10 years, we have employed a regional multistation template matching (RMTM) technique to cataloged events across the state. Applying waveform correlation to a consistent set of regional stations that record continuously through time results in more constant detection at a lower magnitude threshold, providing a larger,
- [Fiber Optic Gyroscope Road-Map for Highest Rotational Ground Motion Sensitivity on the Field](https://www.seismosoc.org/presentations/fiber-optic-gyroscope-road-map-for-highest-rotational-ground-motion-sensitivity-on-the-field/) - When the ground moves, it does not only shake in translation, but it twists too! Indeed, any motion has 6 degrees of freedom. But all the seismometers provide only translation measurement. Rotational seismology is a hot topic in seismology since instruments have been built to bring first ground rotation measurement. It started as laboratory instrument
- [DeepDetect: An Application of Deep Densely Connected Convolutional Neural Network to Earthquake Detection](https://www.seismosoc.org/presentations/deepdetect-an-application-of-deep-densely-connected-convolutional-neural-network-to-earthquake-detection/) - Earthquake detection is a fundamental element in seismic data processing. How to automatically detect earthquakes in an accurate and efficient way is of particular interest as today’s seismic data volume is rapidly growing. Here we present a software package, DeepDetect, to accurately and efficiently detect earthquakes from continuous seismic records. We build our algorithm on
- [The Northern California Seismic System: History, Operations, and Upgrades to Seismic Monitoring for Earthquake Early Warning](https://www.seismosoc.org/presentations/the-northern-california-seismic-system-history-operations-and-upgrades-to-seismic-monitoring-for-earthquake-early-warning/) - We describe the ongoing efforts of the Northern California Seismic System (NCSS) in upgrading and densifying the northern California regional seismic networks for Earthquake Early Warning (EEW) use. The NCSS was born in the late 1990s from the integration of UC Berkeley’s Berkeley Digital Seismic Network (BDSN) and the USGS’s Northern California Seismic Network (NCSN),
- [Examination of the Reference-Phase Concept in Seismology in the Presence of Small-Scale Heterogeneities](https://www.seismosoc.org/presentations/examination-of-the-reference-phase-concept-in-seismology-in-the-presence-of-small-scale-heterogeneities/) - The concept of the ‘reference phase’ is widely used in seismic tomography and imaging. Usually, a differential traveltime between the prominent reference phase and another seismic phase is used with the hope to eliminate the influence of unknown velocity structure on their common travel paths. It is well known that Earth has inhomogeneities at all
- [Numerical Simulation of Microtremor Array Measurements at 2D and 3D Structures Using 3D Finite-Difference Method](https://www.seismosoc.org/presentations/numerical-simulation-of-microtremor-array-measurements-at-2d-and-3d-structures-using-3d-finite-difference-method/) - Demand on the development of non-invasive measurement methods for shallow S-wave velocity structure is increasing. Active and passive surface wave method will play important role in such measurements. Passive surface wave method or microtremor array measurements particularly receive large attention since the method can penetrate several hundreds to several kilometers easily. Applicability of microtremor array
- [What Caused the Local Stress Perturbation in Long Valley, California?](https://www.seismosoc.org/presentations/what-caused-the-local-stress-perturbation-in-long-valley-california/) - Long Valley in eastern California is sandwiched by the Sierra Nevada and the Basin and Range Province. There has been a stress perturbation in the vicinity of the caldera with respect to the regional stress field. Previous studies suggest that this perturbation is a result of the left-step offset in the Sierran range bounding normal
- [Detection of Background Seismic Waves Anomalies with a Hierarchical Temporal Memory (HTH) Cortical Algorithm](https://www.seismosoc.org/presentations/detection-of-background-seismic-waves-anomalies-with-a-hierarchical-temporal-memory-hth-cortical-algorithm/) - We used an unsupervised cortical algorithm to detect in real time anomalies in simulated and real seismic signals. The algorithm works on-line receiving continuous seismic acceleration signals from a streaming station. This could be a software source that is simulating the data stream from a suitable algorithm, or could be data timeseries from a database
- [Source Parameter Variability of Intermediate-Depth Earthquakes in Japan Estimated from Empirical Green's Functions](https://www.seismosoc.org/presentations/source-parameter-variability-of-intermediate-depth-earthquakes-in-japan-estimated-from-empirical-greens-functions/) - The mechanism of intermediate-depth earthquakes occurring within subducting slabs remains controversial. Two proposed mechanisms for these earthquakes are dehydration embrittlement and thermal shear instability. By analyzing the stress drops and radiated energies determined from the recorded waveforms of these earthquakes, we can constrain the radiated efficiencies of the events and hence determine to what degree
- [Comparison of Vs30 Determined from Rayleigh Waves and Love Waves at Six Strong Ground Motion Sites in Napa, California](https://www.seismosoc.org/presentations/comparison-of-vs30-determined-from-rayleigh-waves-and-love-waves-at-six-strong-ground-motion-sites-in-napa-california/) - The 24 August 2014 Mw 6.0 South Napa earthquake caused $400 million in damage to private and commercial properties. Previous site response studies indicate areas that experienced extensive structural damage are underlain by deposits with low Vs30 values. The goal of our study was to evaluate shear-wave velocity to 30 m depth (Vs30) using body
- [Site Effects Characterization at Portoviejo City (Ecuador) by Normalizing Seismic Noise Spectra Using Aftershocks](https://www.seismosoc.org/presentations/site-effects-characterization-at-portoviejo-city-ecuador-by-normalizing-seismic-noise-spectra-using-aftershocks/) - During the April 16th 2016 Mw 7.8 interface subduction earthquake in central Ecuador, Portoviejo (300.000 h; 150 km S of the epicenter) suffered severe damage, mainly in the commercial district where the tallest and largest buildings were clustered. Questions arose whether or not the soil in downtown area was responsible of such concentrated impact, rendering
- [GNSS Network of the Mexican National Seismological Service](https://www.seismosoc.org/presentations/gnss-network-of-the-mexican-national-seismological-service/) - Strong motion instrumentation in Mexico dates from the seventies, accumulating a considerable historical record of significant earthquakes. Such information has been mainly for seismic engineering and seismological research. Having an adequate infrastructure allows us to understand the origin and consequences of the seismic activity, based on timely and reliable information, to facilitate decision making by
- [Toward a Geodetic Near-Real Time System for Tectonic and Crustal Deformation Studies in Colombia and Venezuela South America](https://www.seismosoc.org/presentations/toward-a-geodetic-near-real-time-system-for-tectonic-and-crustal-deformation-studies-in-colombia-and-venezuela-south-america/) - GeoRED, the Spanish acronym for “Geodesia: Red de Estudios de Deformación” or “Geodesy: Deformation Studies Network”, is a research, innovation and development project based on space geodesy, run by the Space Geodesy Research Group of the Geohazards Directorate of the Colombian Geological Survey, that takes a multifaceted approach to understanding the geodynamics and tectonics of
- [Hazard Implications from High-Precision Earthquake Relocations in the Dominican Republic](https://www.seismosoc.org/presentations/hazard-implications-from-high-precision-earthquake-relocations-in-the-dominican-republic/) - Accurate earthquake locations are critical to identifying faults, understanding tectonics, and estimating a region’s seismic hazard. The Dominican Republic and neighboring Haiti have been the site of numerous devastating earthquakes. A complex pattern of tectonic stresses is created by (a) the oblique subduction of the southward-dipping North American plate in the north, (b) the east-west-trending
- [Probabilistic Seismic Hazard Assessment  for Large Dam Area, Georgia (Sakartvelo) Case](https://www.seismosoc.org/presentations/probabilistic-seismic-hazard-assessment-for-large-dam-area-georgia-sakartvelo-case/) - The present work has been done in order to determine detailed seismic hazard that is required for designing a seismically resistant hydro power plant in the north-western part of Georgia. According to current normative seismic zoning map of Georgia, the investigated area as a whole is located in a zone of MSK intensity IX, and
- [Next Generation Autonomous Broadband Node](https://www.seismosoc.org/presentations/next-generation-autonomous-broadband-node/) - The surge of using geophoned autonomous nodes for scientific projects is advancing passive imaging and monitoring techniques for scientific research, oil and gas projects, hydrology, civil engineering and new applications for short term dense seismic monitoring. The concept of a small, minimal configuration, low power, simple deployments without worry of environmental conditions can be applied
- [SCSN Data Quality Control and Station Health Assessment Tools](https://www.seismosoc.org/presentations/scsn-data-quality-control-and-station-health-assessment-tools/) - The USGS/Caltech Southern California Seismic Network (SCSN) is a modern digital ground motion seismic network. It develops and maintains Earthquake Early Warning (ShakeAlert) data collection and delivery systems in southern California as well as real-time ShakeAlert algorithms. Here we present recent and ongoing innovations in telemetry, data quality control, and data analysis that keep the
- [Station and Telemetry Impact Metrics for Earthquake Early Warning Seismic Network Performance Evaluation](https://www.seismosoc.org/presentations/station-and-telemetry-impact-metrics-for-earthquake-early-warning-seismic-network-performance-evaluation/) - Funding agencies and network operators share an interest in understanding the performance benefits from investments in seismic stations and telemetry. The earthquake early warning (EEW) mission comes with additional requirements for coverage and resilience compared to conventional regional seismic monitoring. EEW alerts require greater spatial coverage, and network communications have to maintain that coverage after
- [Spatial Distribution of Site Response and Building Damage in Mexico City Resulting from the September 19, 2017, M7.1 Central Mexico Earthquake](https://www.seismosoc.org/presentations/spatial-distribution-of-site-response-and-building-damage-in-mexico-city-resulting-from-the-september-19-2017-m7-1-central-mexico-earthquake/) - Since the 1985 Michoacan Earthquake, the soft, high water content clays filling the lakebed of Lake Texcoco are known to exhibit resonance at a frequency of about 0.5 Hz and cause significant site response in Mexico City. The data from the Puebla Earthquake on 19 September 2017 also displays this behavior in the ground motion
- [Seismic Reflection Imaging With Earthquake Sources and Dense Arrays: Beyond Structural Imaging From P-Wave Reflections](https://www.seismosoc.org/presentations/seismic-reflection-imaging-with-earthquake-sources-and-dense-arrays-beyond-structural-imaging-from-p-wave-reflections/) - Recent studies showed that microearthquakes recorded by a dense array of receivers at the surface have the same raypath geometry as Reverse Vertical Seismic Profiling (RVSP) surveys, which in principle, allows the use of microearthquake sources combined with RVSP processing to produce high-resolution 3D reflection images of structure beneath the receiver array. Earlier examples of
- [The Role of Long-Term Tectonic Deformation on the Distribution of Present-Day Seismic Activity in the Caribbean and Central America](https://www.seismosoc.org/presentations/the-role-of-long-term-tectonic-deformation-on-the-distribution-of-present-day-seismic-activity-in-the-caribbean-and-central-america/) - The Caribbean and Central America region (CCAR) undergoes the entire spectrum of earthquake types due to its complex tectonic setting comprised of transform zones, young oceanic spreading ridges, and subductions along its eastern and western boundaries. CCAR is, therefore, an ideal setting in which to study the impacts of long-term tectonic deformation on the distribution
- [Shallow Sedimentary Structure of the Tangshan Earthquake Region Unveiled by Dense Seismic Array and Microtremor Survey](https://www.seismosoc.org/presentations/shallow-sedimentary-structure-of-the-tangshan-earthquake-region-unveiled-by-dense-seismic-array-and-microtremor-survey/) - The Tangshan fault belt is deemed as the seismogenic fault for the 1976 Ms7.8 Tangshan earthquake, which is one of the most devastating earthquakes in the last 100 years in the world and caused more than 240,000 deaths. The dense array ambient vibration surveys with ~ 4 km inter-station distance 146 stations were applied in
- [Spectral Analysis of Earthquakes with Hypocenter in Basin of Mexico](https://www.seismosoc.org/presentations/spectral-analysis-of-earthquakes-with-hypocenter-in-basin-of-mexico/) - We present attenuation (t*) and source parameters (Δσ y Mw), obtained through spectral analysis, for earthquakes with hypocenter within the basin of Mexico. These events were recorded by the Red Sísmica del Valle de México (RSVM, Valley of Mexico Seismological Network), composed of 31 broadband stations distributed in Mexico City and surroundings. We analyze events
- [How Faults Wake Up: The Guthrie-Langston, Oklahoma, Earthquakes](https://www.seismosoc.org/presentations/how-faults-wake-up-the-guthrie-langston-oklahoma-earthquakes/) - Large-scale wastewater disposal has led to a fast-paced reawakening of faults in the Oklahoma/Kansas region. High resolution earthquake relocations show that the inventory of ancient basement faults in the study region differs from results of seismic surveys and geologic mapping focused on the sedimentary cover. We analyze the evolution of seismic activity in the Guthrie-Langston
- [Tsunami Response Lessons Learned in Puerto Rico from the January 10, 2018, 7.6 Mw Honduras Event](https://www.seismosoc.org/presentations/tsunami-response-lessons-learned-in-puerto-rico-from-the-january-10-2018-7-6-mw-honduras-event/) - The 7.6 Mw Honduras event provided a valuable test of logistical and community preparedness for tsunamis in Puerto Rico (PR) and Virgin Islands (VI). This event provided an opportunity to quantify the extent of the continued recovery of the local emergency alert systems in Puerto Rico post Hurricanes Irma and Maria and highlighted gaps in
- [The Tsunami during the September 8, 2017, Tehuantepec, Mexico Earthquake - Physical Observations and Warning Response](https://www.seismosoc.org/presentations/the-tsunami-during-the-september-8-2017-tehuantepec-mexico-earthquake-physical-observations-and-warning-response/) - The September 8th 2017, Mw8.2 earthquake offshore Chiapas, Mexico, is the largest earthquake recorded history in Chiapas since 1902. It caused damage in the states of Oaxaca, Chiapas and Tabasco. This earthquake, a deep intraplate event on a normal fault on the oceanic subducting plate, generated a tsunami recorded at several tide gauge stations in
- [Physics-Based injection Induced Earthquake Forecasting: Case Studies from Texas and Oklahoma](https://www.seismosoc.org/presentations/physics-based-injection-induced-earthquake-forecasting-case-studies-from-texas-and-oklahoma/) - The recent dramatic increase in seismic events in the Central and Eastern United States is suggested to be linked to underground high-volume fluid injection. Some researchers investigated the qualitative correlation between the injection operations and induced seismicity. However, they ignored the physical process governing poroelastic fluid diffusion and earthquake nucleation. Thus, we propose a physics-based
- [Progress of the Japanese-Nicaraguan Project for the Establishment of the Central American Tsunami Advisory Center (CATAC)](https://www.seismosoc.org/presentations/progress-of-the-japanese-nicaraguan-project-for-the-establishment-of-the-central-american-tsunami-advisory-center-catac/) - In 2015, the Central American countries (Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica and Panama) agreed to establish a Central American Tsunami Advisory Center (CATAC) at INETER in Managua, Nicaragua. This proposal was also approved by the Intergovernmental Oceanographic Committee (IOC) of UNESCO and the Intergovernmental Coordination Groups (ICG) of the Pacific Ocean Tsunami Warning
- [Numerical Simulations of Tsunami Scenarios for the Southern Coast of Mexico](https://www.seismosoc.org/presentations/numerical-simulations-of-tsunami-scenarios-for-the-southern-coast-of-mexico/) - On September 7th, 2017, a Mw 8.2 earthquake occurred off the coast of Chiapas (Mexico), inside the subducting Cocos slab. The normal mechanism event started at a depth of 50 km (SSN, 2017), causing a small tsunami. The latter was recorded at the central and southern stations of the Servicio Mareografico Nacional of Mexico (SMN),
- [Determining Periodicity in Non-Homogeneous Catalogs Using a Modified Schuster Test with Application to Induced Seismicity in Oklahoma](https://www.seismosoc.org/presentations/determining-periodicity-in-non-homogeneous-catalogs-using-a-modified-schuster-test-with-application-to-induced-seismicity-in-oklahoma/) - For years, scientists have tried to determine whether periodicities exist in earthquake catalogs. These studies have ranged from global to local and looked for influence due to both diurnal tides and seasonality related to snowmelt or rainfall cycles. However, the standard test for periodicity, the Schuster Test, is valid only under the condition of homogeneity
- [Earthquakes and Human Activities to Induce Them in Oklahoma](https://www.seismosoc.org/presentations/earthquakes-and-human-activities-to-induce-them-in-oklahoma/) - The rate of earthquakes across the United States mid-continent has dramatically increased since 2009. The historically high seismicity rates across the mid-continent have been largely driven by substantial increases in seismicity occurring within Oklahoma, including several magnitude 5.0+ earthquakes. Prior to 2009, background seismicity rate was about 2 M 3.0+ earthquakes per year; this increased
- [Keeping USArray Stations in Alaska: Which Ones, How Many, and Where?](https://www.seismosoc.org/presentations/keeping-usarray-stations-in-alaska-which-ones-how-many-and-where/) - The USArray project represents a once-in-a-generation opportunity to fundamentally change geophysical monitoring in the US Arctic. The addition of more than 200 stations capable of recording seismic, infrasound, ground temperature and meteorological data has brought a diverse group of organizations to the table, fostering new connections and collaborations between scientists whose paths otherwise would not
- [A Deep Learning Approach for Enhanced Classification of Global Seismic Waveforms](https://www.seismosoc.org/presentations/a-deep-learning-approach-for-enhanced-classification-of-global-seismic-waveforms/) - Over the past 50 years global seismic detection has matured considerably due to the importance of differentiating seismic events: man-made (mining explosions) from natural phenomena (earthquakes, volcanoes). Where there is still some prevalent concern with these seismological advancements is in separating these classes. This concern derives from the fact that a seismic signature lacks easily
- [A Preliminary Model to Evaluate Long-Term Earthquake Risk Associated With National Bridge Inventory Infrastructure](https://www.seismosoc.org/presentations/a-preliminary-model-to-evaluate-long-term-earthquake-risk-associated-with-national-bridge-inventory-infrastructure/) - We present a preliminary model to systematically quantify the long-term earthquake risk of over six hundred thousand bridges located throughout the conterminous United States. The model uses (1) the 2014 U.S. Geological Survey’s long-term earthquake shaking hazard model, (2) the 2017 National Bridge Inventory (NBI) data available through the Federal Highway Administration (FHWA), and (3)
- [Structural Setting along the Western North Anatolian Fault and Its Influence on the 2014 North Aegean Earthquake (M 6.9)](https://www.seismosoc.org/presentations/structural-setting-along-the-western-north-anatolian-fault-and-its-influence-on-the-2014-north-aegean-earthquake-m-6-9/) - We investigated microseismicity, geodetic slip and structural setting along the western North Anatolian Fault NAF to characterize their influence on pre-, co- and post-seismic stages of the 2014 North Aegean Earthquake (M 6.9). We identified that the NAF in North Aegean Sea (NAS) operates beneath three basins and two transpressional ridges rather than a single
- [Toward a Reliable Tsunami Early Warning System in Puerto Rico](https://www.seismosoc.org/presentations/toward-a-reliable-tsunami-early-warning-system-in-puerto-rico/) - The term early warning is used in many fields to describe the provision of information on an emerging dangerous hazard that enables advance action to reduce the associated risks to the lives and property. Early warning systems exist for natural and biological hazards, procedures are also used in social, industrial and personal emergencies as a
- [Vision and Numerical Simulation-Based Ground Deformation Testing Method](https://www.seismosoc.org/presentations/vision-and-numerical-simulation-based-ground-deformation-testing-method/) - To resolve the problem of ground motion observation which lead to the widespread concern in the field of seismic engineering, this study provided a non-contact ground deformation testing method based on vision technology and numerical simulation. Studies are carried out on key technologies of this dynamic ground deformation testing system, such as the vision data
- [Insights into the Influence of Local Site Amplification on Magnitude Determination: Key Observations and Modeling Using the Stochastic Method](https://www.seismosoc.org/presentations/insights-into-the-influence-of-local-site-amplification-on-magnitude-determination-key-observations-and-modeling-using-the-stochastic-method/) - Modern seismic hazard analyses rely on the reliability of seismic catalogues to characterise regional seismicity. Local seismic networks will derive scaling relationships between ML, the magnitude of choice for routine observatory monitoring, and M, the magnitude used for modern PSHAs. However, numerous studies have highlighted a discontinuity between M and ML. We explore the role
- [The Exotic Seismic Events Catalog (ESEC) Data Product](https://www.seismosoc.org/presentations/the-exotic-seismic-events-catalog-esec-data-product/) - Exotic seismic sources are non-earthquake seismic sources such as landslides, debris flows, dam collapses, floods, glacier seismicity, and avalanches that generate seismic signals, but are rarely included in traditional earthquake catalogs. The Exotic Seismic Events Catalog (ESEC, http://ds.iris.edu/ds/products/esec/) is a new Incorporated Research Institutions for Seismology (IRIS) Data Management Center data product that uses the
- [Seismicity in Pennsylvania and the Pennsylvania State Seismic Network](https://www.seismosoc.org/presentations/seismicity-in-pennsylvania-and-the-pennsylvania-state-seismic-network/) - Seismicity in Pennsylvania results from natural earthquakes, mining blasts, and other induced events. Earthquakes occur primarily in the northwestern and southeastern portions of the state. Seismic events caused by mine and quarry blasts occur throughout the state, mainly in the coal mining regions, and although rare, there have been seismic events associated with hydraulic fracturing.
- [Crustal Structure Across the Appalachian Basin Using Joint Inversion of P-Wave Receiver Functions and Surface Wave Dispersion](https://www.seismosoc.org/presentations/crustal-structure-across-the-appalachian-basin-using-joint-inversion-of-p-wave-receiver-functions-and-surface-wave-dispersion/) - Induced seismicity as a result of hydraulic fracturing and the subsequent wastewater disposal process has been a concern in recent years. Although typically small magnitude events, these induced earthquakes can reach magnitudes large enough to cause damage to nearby structures. The majority of induced seismic events occur within old basement faults below the target formation.
- [RTX Correction Accuracy and Real-Time Data Processing of the New Integrated SeismoGeodetic System with Real-Time Acceleration and Displacement Measurements for Earthquake Characterization Based on High-Rate Seismic and GPS Data](https://www.seismosoc.org/presentations/rtx-correction-accuracy-and-real-time-data-processing-of-the-new-integrated-seismogeodetic-system-with-real-time-acceleration-and-displacement-measurements-for-earthquake-characterization-based-on-hig/) - We will discuss and show the results obtained from an integrated SeismoGeodetic System, model SG160-09, installed in the Chile (Chilean National Network), Italy (University of Naples Network), and California. The SG160-09 provides the user high rate GNSS and accelerometer data, full epoch-by-epoch measurement integrity and, using the Trimble RTPD Client, the ability to create combined
- [Monte Carlo Simulations for Analysis and Prediction of Non-Stationary Magnitude-Frequency Distributions in Probabilistic Seismic Hazard Analysis](https://www.seismosoc.org/presentations/monte-carlo-simulations-for-analysis-and-prediction-of-non-stationary-magnitude-frequency-distributions-in-probabilistic-seismic-hazard-analysis/) - We describe a first principles methodology to evaluate statistically the hazard related to non-stationary seismic sources like induced seismicity. We use time-dependent Gutenberg-Richter parameters, which leads to a time-varying rate of earthquakes. This is achieved by deriving analytic expressions for occurrence rates which are verified using Monte Carlo simulations. We show two examples: (1) a
- [Lithospheric Structure of the Pantanal Basin from the Analysis of Fundamental and Higher Modes Surface Waves](https://www.seismosoc.org/presentations/lithospheric-structure-of-the-pantanal-basin-from-the-analysis-of-fundamental-and-higher-modes-surface-waves/) - The study of crustal and lithospheric thicknesses provides valuable information about the Earth’s dynamics, allowing to identify stress patterns, isostatic compensation degrees and to generate crustal evolution models. Lithospheric thickness in South America is poorly understood, being the Andean region the most studied. The aim of this work is to evaluate the lithospheric structure of
- [Active Pressure Management as a Tool to Reduce Induced Seismicity](https://www.seismosoc.org/presentations/active-pressure-management-as-a-tool-to-reduce-induced-seismicity/) - It has been suggested that industrial operators may modify injection or production rates to actively manage fluid pressures in disposal reservoirs as a means of reducing the risk of induced seismicity. Therefore, we evaluate the efficacy of such active pressure management techniques by coupling a geomehanical reservoir model with an earthquake simulator. We use RSQSim,
- [New Constraints on Seismic Anisotropy beneath the Eastern Ghats Mobile Belt and Adjacent Archean Cratons Contact Boundary](https://www.seismosoc.org/presentations/new-constraints-on-seismic-anisotropy-beneath-the-eastern-ghats-mobile-belt-and-adjacent-archean-cratons-contact-boundary/) - We investigate seismic anisotropy signatures of Eastern Ghats Mobile Belt (EGMB) and adjacent Archean cratons, namely Singhbhum and Bastar in southeastern India. The craton and Eastern Ghats contact boundary is defined as a collisional suture which has witnessed episodes of rifting related to the breakup of supercontinent Columbia, superimposed with later episodes of collision of
- [General Viscoelastic Ray Theory](https://www.seismosoc.org/presentations/general-viscoelastic-ray-theory/) - General ray theory recently developed for P and S body waves in layered viscoelastic media provides new insights for the travel-time and amplitude-attenuation characteristics of seismic waves in an anelastic Earth. Solutions of the forward ray tracing problems for horizontal and spherical media account for changes in velocity and attenuation of general P and S
- [ShakeMap Ground-Motion Interpolation Using the Multivariate Normal Distribution](https://www.seismosoc.org/presentations/shakemap-ground-motion-interpolation-using-the-multivariate-normal-distribution/) - A key update in the next major release of ShakeMap is the application of the multivariate normal distribution (MVN) to ground motion interpolation. The MVN provides a complete solution to the problem of ground-motion interpolation, fully accounting for the correlation among the instrumental observations both spatially and across intensity measure types (IMTs), and is therefore
- [Remote Dynamic Triggering in Southeast Africa](https://www.seismosoc.org/presentations/remote-dynamic-triggering-in-southeast-africa/) - We present results of the first systematic search for evidence of dynamic triggering of microearthquakes in southeast Africa. We analyzed seismic waveforms from 53 broadband and short-period stations in SE Africa, to identify increases in the rate of microearthquakes and tremor coincident with the passage of the Mw8.6 2012 Indian Ocean earthquake teleseismic waves (Neves
- [Accounting for Attenuation Physics Uncertainty in FWI](https://www.seismosoc.org/presentations/accounting-for-attenuation-physics-uncertainty-in-fwi/) - Attenuation and dispersion have a significant impact in full waveform inversion and are essential to achieving greater resolution and fidelity in the inversion. These properties are often modeled in full waveform inversion using empirical nearly constant Q models. Significantly, these models do not hold universally, especially when large ranges of frequencies are considered. In this
- [Very Long Period and Short Period Eruption Seismograms and Progressive Conduit Changes at Erebus Volcano, Antarctica](https://www.seismosoc.org/presentations/very-long-period-and-short-period-eruption-seismograms-and-progressive-conduit-changes-at-erebus-volcano-antarctica/) - We analyze near-repeating broadband seismograms from nearly 3,000 eruptions (2003-2011) from the Erebus volcano lava lake to investigate temporal changes in the shallow eruptive dynamics of an open conduit volcano. Cross-correlation analysis reveals progressive variable time lags between correlation-aligned short period (SP) and very long period (VLP) seismogram components ranging over approximately +-1 s, and
- [Quasi-Static Fault Dislocation Driven by Fluid Diffusion and Poroelastic Stressing as a Possible Source Model of Slow Slip Events: A Numerical Investigation](https://www.seismosoc.org/presentations/quasi-static-fault-dislocation-driven-by-fluid-diffusion-and-poroelastic-stressing-as-a-possible-source-model-of-slow-slip-events-a-numerical-investigation/) - Slow slip events (SSEs) are commonly observed at a plate interface between a viscously slipping portion and a seismogenenic zone. Recently, SSEs have also been reported following in-situ fluid injection experiments. Almost all exiting models of SSEs are friction-based, utilizing unstable-stable transitional fault frictional behavior, in conjunction with suitable rheology of fault zones in the
- [What Is the Maximum Spatial Reach of Fluid-Injection Operations? Examining Seismicity Decay and Poro-Elastic Effects around Injection Wells](https://www.seismosoc.org/presentations/what-is-the-maximum-spatial-reach-of-fluid-injection-operations-examining-seismicity-decay-and-poro-elastic-effects-around-injection-wells/) - Fluid injection induced seismicity is commonly modeled by assuming purely fluid-pressure-driven earthquakes. However, this assumption is challenged by induced sequences with observed far-field triggering. To unravel triggering mechanisms of injection-induced earthquakes, we examine the spatial decay and space-time migration of ~30 induced seismicity cases. We limit our analysis to point source, single well injectors in
- [Can Triggered and Induced Earthquakes be Supershear Rupture Events? A Numerical Investigation](https://www.seismosoc.org/presentations/can-triggered-and-induced-earthquakes-be-supershear-rupture-events-a-numerical-investigation/) - Fluid plays a pivotal role in triggering and inducing seismic events. However, the effect of fluid on the co-seismic rupture process remains largely unknown. To this end, we develop a fully dynamic spontaneous rupture model specific for fluid-related seismic events. Central to our model is the consideration of the fluid effect that accumulates over the
- [Modeling of Seismic Liquefaction Effects on Structure in the City of Medellin, Colombia](https://www.seismosoc.org/presentations/modeling-of-seismic-liquefaction-effects-on-structure-in-the-city-of-medellin-colombia/) - In the last decade, a number of studies have been published on the seismic site response and the importance of site effects at the greater metropolitan area of Medellín in the Aburrá Valley, a seismically active region of the Colombian Andes. Most studies have focused on the topographic effect and the effect of the contrasts
- [Automatic Detection and Location of Seismo-Volcanic Signals Based on the Seismic Network Covariance Matrix: Examples from Tenerife (Canary Islands) and the Klyuchevskoy Volcanic Group (Kamchatka)](https://www.seismosoc.org/presentations/automatic-detection-and-location-of-seismo-volcanic-signals-based-on-the-seismic-network-covariance-matrix-examples-from-tenerife-canary-islands-and-the-klyuchevskoy-volcanic-group-kamchatka/) - We developed a network-based method for detecting and locating seismo-volcanic signals such as volcano-tectonic earthquakes, long-period events, and volcanic tremors. The method is based on the analysis of eigenvalues and eigenvectors of the seismic network covariance matrix, the equivalent in the frequency domain of the cross-correlation matrix. First, the width of the network covariance matrix
- [Seismicity of the Lazufre Volcanic System, Northern Chile/Argentina](https://www.seismosoc.org/presentations/seismicity-of-the-lazufre-volcanic-system-northern-chile-argentina/) - Cordon del Azufre and Lastarria are two volcanoes on the border of Chile and Argentina that have been shown to have an unusual deformation signature. The main center of deformation is between the two volcanoes, with the top of the modelled deformation source at a depth of 7-15 km. A smaller deformation signal is near
- [Strong Motion Simulation for the 2004 Southwest-Off Kii Peninsula Earthquake with Pseudo Point-Source Model](https://www.seismosoc.org/presentations/strong-motion-simulation-for-the-2004-southwest-off-kii-peninsula-earthquake-with-pseudo-point-source-model/) - We have been testing the applicability of a new simplified source model called the “pseudo point-source model,” which was aimed to calculate strong ground motions (Nozu 2012). The model is simpler, and involves much less model parameters than the conventional characterized source model, which itself is a simplified expression of an actual earthquake source. In
- [Numerical Simulation of M9 Megathrust Earthquakes in the Cascadia Subduction Zone](https://www.seismosoc.org/presentations/numerical-simulation-of-m9-megathrust-earthquakes-in-the-cascadia-subduction-zone/) - We estimate ground motions in the Pacific Northwest urban areas during M9 subduction scenario earthquakes on the Cascadia megathrust by simulating wave propagation from an ensemble of kinematic source descriptions. Velocities and densities in our computational mesh are defined by integrating the regional Cascadia Community Velocity model (V1.6, Stephenson et al., 2017) including the ocean
- [Kinematic Source Models for Earthquake Simulations with Fault-Zone Plasticity](https://www.seismosoc.org/presentations/kinematic-source-models-for-earthquake-simulations-with-fault-zone-plasticity/) - Fault slip and surface deformation patterns are essential factors in seismic hazard assessment. However, slip inversions reveal a widely observed shallow slip deficit (SSD) which has not yet been clearly explained. One possible cause of the SSD is distributed plastic deformation in the fault damage zone near the surface. Roten et al. (2017) performed 3D
- [A Computational Model of the Seismic Response in the Valley of Mexico after the Damaging m7.1 Earthquake of September 19, 2017](https://www.seismosoc.org/presentations/a-computational-model-of-the-seismic-response-in-the-valley-of-mexico-after-the-damaging-m7-1-earthquake-of-september-19-2017/) - Built-up on top of ancient lake deposits, Mexico City experiences some of the largest seismic site effects in the world. The M7.1 intermediate-depth earthquake of September 19, 2017 (S19) collapsed 43 one-to-ten story buildings in the city close to the western edge of the lake-bed sediments, on top of the geotechnically-known transition zone. In this
- [Influence of Normal Pressure on the Stick-Slip Behavior of Sheared Granular Fault Gouge Using the Combined Finite-Discrete Element Method](https://www.seismosoc.org/presentations/influence-of-normal-pressure-on-the-stick-slip-behavior-of-sheared-granular-fault-gouge-using-the-combined-finite-discrete-element-method/) - The presence of randomly packed solid granular particles in fault gouge has considerable influence on the slip properties of tectonic faults. As a result, sheared granular layers undergoing stick‑slip behavior are broadly employed to study the physics and dynamics of earthquakes (Geller et al., 2015; Johnson et al., 2008; Scuderi et al., 2017). Among the
- [Real-Time Earthquake Impact Mapping in Indonesia: The Case of the 2016 Aceh Earthquake (m6.5)](https://www.seismosoc.org/presentations/real-time-earthquake-impact-mapping-in-indonesia-the-case-of-the-2016-aceh-earthquake-m6-5/) - Indonesia is one of the most earthquake disaster-prone countries in the world due to its tectonic activity and high population exposure. To assist with the earthquake response process, Indonesia's Agency of Meteorology, Climatology and Geophysics (BMKG) generates near-real-time maps of ground motion and shaking intensity (i.e. ShakeMaps) following significant earthquakes. The original ShakeMaps are based
- [Shake-Map Movie by Using Data Assimilation and Correction of Site Amplification in Time Domain](https://www.seismosoc.org/presentations/shake-map-movie-by-using-data-assimilation-and-correction-of-site-amplification-in-time-domain/) - Monitor of spatial distribution of ground shaking, that is shake-map, is important for rapid assessment of earthquake damage. Shake-maps usually indicate distribution of eventual distribution of ground shaking (PGA, PGV or seismic intensity), and it does not contain information of time evolution of ground shaking. Here we propose to extend it to shake-map of ongoing
- [Exploring the Extent of Wave Propagative Effects on Teleseismic Attenuation Measurements within the Sierra Nevada](https://www.seismosoc.org/presentations/exploring-the-extent-of-wave-propagative-effects-on-teleseismic-attenuation-measurements-within-the-sierra-nevada/) - Previous attempts at imaging the upper mantle intrinsic attenuation structure beneath the southern Sierra Nevada have strongly indicated that propagative effects on t* measurements predominate over anelastic ones. Teleseismic shear wave t* measurements from a handful of events at stations proximal to the Isabella anomaly, a high velocity upper mantle feature, exhibit higher t* values
- [Pedestrian Evacuation Analysis in Case of Tsunami for the Puerto Rico Municipalities of Aguadilla, Arecibo and Ponce](https://www.seismosoc.org/presentations/pedestrian-evacuation-analysis-in-case-of-tsunami-for-the-puerto-rico-municipalities-of-aguadilla-arecibo-and-ponce/) - In the past decade, the world has witnessed of numerous tsunamis and earthquakes in different parts of the world such as Indonesia (2004), Peru (2007), Haiti and Chile (2010), Japan (2011) and the most recent one in Chile (2015) with waves close to 4.6 m and substantial damages. In Puerto Rico, the last tsunami that
- [Reservoir Induced Seismicity in Brazil: Characteristics and New Cases](https://www.seismosoc.org/presentations/reservoir-induced-seismicity-in-brazil-characteristics-and-new-cases/) - The first observations of seismicity related to reservoir impoundment in Brazil occurred in the early 1970’s. The largest reservoir-related earthquake (4.2 mb) occurred in 1974. Interest in reservoir-triggered seismicity contributed to motivate the development of Seismology in Brazil. After the 1980’s and 1990’s, with the decrease in the rate of dam construction in Brazil, interest
- [The Probabilistic Tsunami Hazard Assessment Map for the Neam Region: Results of the Tsumaps-Neam Project](https://www.seismosoc.org/presentations/the-probabilistic-tsunami-hazard-assessment-map-for-the-neam-region-results-of-the-tsumaps-neam-project/) - Probabilistic Tsunami Hazard Assessment (PTHA) is an indispensable step for long-term coastal planning and for effectively designing and using Tsunami Warning Systems. In the last decade, Europe has promoted a better understanding of the tsunami phenomenon through research projects (e.g. TRANSFER, NEARTOWARN, ASTARTE) and started programs for preventing the tsunami impact along the coastlines of
- [On the Variability of the Seismic Response during Multiple Decameter-Scale Hydraulic Stimulations](https://www.seismosoc.org/presentations/on-the-variability-of-the-seismic-response-during-multiple-decameter-scale-hydraulic-stimulations/) - To improve our understanding of the seismo-hydro-mechanical coupled processes associated with deep-geothermal reservoir creation, a decameter-scale In-situ Stimulation and Circulation (ISC) experiment was conducted at the Grimsel Test Site in Switzerland. The stimulation phase of the experiment included multiple hydraulic stimulations (i.e., hydraulic shearing and hydraulic fracturing tests) under repeatable pumping condition. The stimulations were
- [Benchmarking Multilayer-Hysea Model for Landslide Generated Tsunamis](https://www.seismosoc.org/presentations/benchmarking-multilayer-hysea-model-for-landslide-generated-tsunamis/) - Landslide tsunami hazard may be dominant along significant parts of the coastline around the world, in particular in the USA or Caribbean Sea, as compared to hazards from other tsunamigenic sources. This fact motivated NTHMP about the need of benchmarking models for landslide generated tsunamis, following the same methodology already used for standard tsunami models
- [Detailed Structure of the Upper-Mantle Discontinuities Using a Novel Approach and High-Frequency Triplication Data](https://www.seismosoc.org/presentations/detailed-structure-of-the-upper-mantle-discontinuities-using-a-novel-approach-and-high-frequency-triplication-data/) - Constraining elastic properties of the 410- and 660-km discontinuities is vital for understanding the mantle composition and dynamics. One approach to study the transition zone is to use the “triplicated” arrivals of seismic data. These arrivals provide strong constraints on the depth, width, and velocity across the discontinuities; however, it is difficult to distinguish the
- [Anisotropic Attenuation in Rocks: Theory and Lab Measurements](https://www.seismosoc.org/presentations/anisotropic-attenuation-in-rocks-theory-and-lab-measurements/) - Anisotropic attenuation affects seismic observations and complicates their interpretations. Its accurate determination is, however, difficult and needs extensive measurements of wawefields in many directions. We developed and numerically tested an iterative inversion scheme for determining the parameters of anisotropic attenuation. We present a lab facility that allows for measuring anisotropic attenuation using the P-wave ultrasonic
- [Induced Seismicity in the High Agri Valley (Southern Italy): First Observations from the INSIEME Seismic Network](https://www.seismosoc.org/presentations/induced-seismicity-in-the-high-agri-valley-southern-italy-first-observations-from-the-insieme-seismic-network/) - It is worldwide recognized that a range of human activities like water reservoir impoundment, mining activity, underground nuclear tests, enhanced geothermal systems, injection/withdrawal of fluids into/from the ground associated with the gas storage, the CO2 sequestration, and the exploitation of oil and gas fields are claimed as responsible for induced seismicity. Many areas where induced
- [Trade-Offs in Parameters Describing Earth's Heterogeneity Spectrum and Intrinsic Attenuation](https://www.seismosoc.org/presentations/trade-offs-in-parameters-describing-earths-heterogeneity-spectrum-and-intrinsic-attenuation/) - Using envelopes of regional high frequency seismograms synthesized by a 3-D radiative transport algorithm (Sanborn et al., 2017), we investigated tradeoffs in model parameters describing the heterogeneity spectrum and intrinsic attenuation of the crust and upper mantle. Probability density functions that control scattering directions, mean free paths, and polarizations suggest that the square of the
- [The 3-D Reference Earth Model: Status and Preliminary Results](https://www.seismosoc.org/presentations/the-3-d-reference-earth-model-status-and-preliminary-results/) - One-dimensional reference Earth models (e.g. PREM) have proven indispensable in earthquake location, imaging of interior structure, understanding material properties under extreme conditions, and as a reference in other fields, such as particle physics and astronomy. Over the past three decades, 3D models of how properties vary both laterally and with depth have been developed. Though
- [Source Spectra for Explosion Monitoring](https://www.seismosoc.org/presentations/source-spectra-for-explosion-monitoring/) - We derive source spectra from local and regional distance, direct and coda waves, using empirical methods. The coda adds stability and measurement precision. Source spectra can be used to estimate Mw for earthquakes, and yield, along with emplacement parameters for underground explosions. Propagation effects are eliminated using a 2-D attenuation and site response model, obtained
- [Recent Development of Seismic Attenuation Modeling and Imaging in Exploration Seismology](https://www.seismosoc.org/presentations/recent-development-of-seismic-attenuation-modeling-and-imaging-in-exploration-seismology/) - Seismic approaches based on the phase/traveltimes are widely and successfully used to image the subsurface geological structure. On the other hand, the amplitude of seismic waveform that is hoping for providing more physical information about geology has not been explored in a consistent way. There exists a gap between current seismic capability and the full
- [Earthquake Rupture Propagation and Termination in Fault Zones with Along-Strike Variation of Damage](https://www.seismosoc.org/presentations/earthquake-rupture-propagation-and-termination-in-fault-zones-with-along-strike-variation-of-damage/) - Faults are surrounded by a hierarchical structure of damaged rocks. Such damaged fault zones can extend several hundred meters across major faults such as San Andreas, Nojima and North Anatolian faults. They also show along-strike variation of damage that may be correlated with historical earthquake ruptures. Due to the change of energy required for rupture
- [Effect of the Gaochuan Right Bend on Fault Spontaneous Rupture Propagation in the 2008 Wenchuan Earthquake: Interpretation of Seismic Hazard in the Beichuan Area](https://www.seismosoc.org/presentations/effect-of-the-gaochuan-right-bend-on-fault-spontaneous-rupture-propagation-in-the-2008-wenchuan-earthquake-interpretation-of-seismic-hazard-in-the-beichuan-area/) - The Beichuan area suffered the most serious seismic damage in the 2008 Wenchuan earthquake although the Beichuan is over 100 km away from the instrumental epicenter of the mainshock. The mechanism for this peculiar phenomenon remains unclear even though nearly 10 years has passed since the Wenchuan shock. For this purpose, we construct a spontaneous
- [Finite-Frequency Tomography of 3-D Attenuation Using Rayleigh Waves Recorded by OBS Array](https://www.seismosoc.org/presentations/finite-frequency-tomography-of-3-d-attenuation-using-rayleigh-waves-recorded-by-obs-array/) - The distinct sensitivities of seismic velocity and attenuation (1/Q) to water content, melt, and major element composition yield important constraints on mid-ocean ridge processes and the associated mantle flow pattern, melt distribution, and the interaction of spreading centers with hotspots. Beneath the Juan de Fuca ridge, both body-wave and surface-wave studies observed strong attenuation and
- [Shear Wave Anisotropy, Mantle Flow, and Its Relationship to a Possible Slab Tear in the South Cocos Plate, Mexico](https://www.seismosoc.org/presentations/shear-wave-anisotropy-mantle-flow-and-its-relationship-to-a-possible-slab-tear-in-the-south-cocos-plate-mexico/) - We measured shear wave anisotropy under the Geometry of Cocos (GECO) experiment, deployed at the eastern end of the Trans-Mexican Volcanic Belt. A tear in the south Cocos slab has been proposed [Dougherty and Clayton, 2014]. Two splitting parameters are used to quantify anisotropy. These are the delay time (delta t) and the fast polarization
- [Using Fluid-Induced Microseismicity for Reservoir Characterization at Decatur](https://www.seismosoc.org/presentations/using-fluid-induced-microseismicity-for-reservoir-characterization-at-decatur/) - Better characterization of induced microseismic events can reveal important geomechanical parameters and support the assessment of seal integrity for fluid injection operations. The spatio-temporal evolution of seismicity in conjunction with source parameter analysis can provide more detailed insight into reservoir behavior. We perform a detailed characterization of microseismic events at the Illinois Basin - Decatur
- [Physical Models of Rock Anelasticity](https://www.seismosoc.org/presentations/physical-models-of-rock-anelasticity/) - Physically meaningful characterization of seismic-wave attenuation is critical in theoretical and observational seismology. However, currently, descriptions of “attenuation” are somewhat mystified by reliance on empirical concepts, such as time-delayed strain-stress responses and frequency-dependent material properties. Attenuation is often treated as abstract “mechanical energy dissipation” measured by the quality factor (Q) of the medium. Nevertheless, in
- [Variations in Source Properties with Evolving Deep Injection at Ngatamariki Geothermal Field, New Zealand](https://www.seismosoc.org/presentations/variations-in-source-properties-with-evolving-deep-injection-at-ngatamariki-geothermal-field-new-zealand/) - Fluid-induced seismicity (FIS) is a useful indicator of thermal and pressure change within a geothermal reservoir. Given the difficulty of making measurements in the space between wells, FIS provides one of the only direct observations of fluid-related reservoir processes. Understanding exactly why and how these microearthquakes occur helps us unravel the movement of fluid and
- [Long-Lived Tsunami Edge Waves during the 2017 m8.2 Tehuantepec, Mexico, Earthquake and Their Implications for Hazards](https://www.seismosoc.org/presentations/long-lived-tsunami-edge-waves-during-the-2017-m8-2-tehuantepec-mexico-earthquake-and-their-implications-for-hazards/) - Rare large normal faulting events can occur at subduction zones. Such is the case of the M8.2 Tehuantepec earthquake which ruptured away from the outer rise underneath the megathrust. The earthquake reactivated bend fault fabric and ruptured the entire lithosphere. Here we will discuss very long lived (48 hours) high amplitude tsunami edge waves observed
- [Dynamic Rupture Simulations at the Scale of Megathrust Fault Systems](https://www.seismosoc.org/presentations/dynamic-rupture-simulations-at-the-scale-of-megathrust-fault-systems/) - Typical subduction zones are characterised by curved thrust fault geometries that merge with the bathymetry under very shallow angles of narrow subduction wedges. Additionally, complicated networks of fault branches at high angles to the megathrust in the overriding and oceanic plates potentially generate strong gaining effects of vertical sea-floor displacements, making tsunami generation more likely.
- [How Widespread Is Human-Induced Seismicity in the USA and Canada?](https://www.seismosoc.org/presentations/how-widespread-is-human-induced-seismicity-in-the-usa-and-canada/) - There has been significant public and scientific interest in the observation of changed seismicity rates in North America since 2008, possibly due to human activities. Van der Baan and Calixto (Geochemistry, Geophysics, Geosystems, 2017) find that the seismicity rate in Oklahoma between 2008 and 2016 is strongly correlated to increased hydrocarbon production. The possibility of
- [Fault Scaling Relationships Depend on the Average Fault Slip Rate](https://www.seismosoc.org/presentations/fault-scaling-relationships-depend-on-the-average-fault-slip-rate/) - This study addresses whether knowing the slip rate on a fault improves estimates of magnitude (MW) of shallow, continental surface-rupturing earthquakes. Based on 43 earthquakes from the database of Wells and Coppersmith (1994), Anderson et al. (1996) previously suggested that estimates of MW from rupture length (LE) are improved by incorporating the slip rate of
- [The September 19th, 2017, (M7.1), Intermediate-Depth Mexican Earthquake: An Energetically Inefficient Deadly Shock](https://www.seismosoc.org/presentations/the-september-19th-2017-m7-1-intermediate-depth-mexican-earthquake-an-energetically-inefficient-deadly-shock/) - On September 19th 2017, a magnitude 7.1 earthquake occurred between the states of Morelos and Puebla, Mexico. The event was a normal-faulting intraplate earthquake with a focal depth of 57 km. Although intermediate depth earthquakes (IDE) of this kind are relatively frequent across the globe, the physics of their source process is still not well
- [Testing Fault-Based Rupture Models](https://www.seismosoc.org/presentations/testing-fault-based-rupture-models/) - PSHA models typically use instrumental seismic data, but seismic networks are too young to record many large (and thus infrequent) earthquakes. Nevertheless, PSHA source models should be consistent with the instrumental record. Comparing instrumentally observed earthquakes with fault models can be complicated because large earthquakes may not occur precisely on prescribed faults and they may
- [Near-Surface P- and S-Wave Speeds Estimated Based upon Body-Wave Polarization](https://www.seismosoc.org/presentations/near-surface-p-and-s-wave-speeds-estimated-based-upon-body-wave-polarization/) - Near-surface structure is crucial in understanding earthquake hazards, since seismic speed is directly related to the level of ground shaking. A novel technique to constrain seismic wave speed immediately beneath a seismic instrument is introduced based upon the polarization measurements of teleseismic body-wave arrivals. We demonstrate a counter-intuitive relationship that the P-wave polarization direction is
- [Deep Learning Aftershock Location Patterns](https://www.seismosoc.org/presentations/deep-learning-aftershock-location-patterns/) - Aftershocks represent the most ubiquitous observations of earthquake triggering. Maximum aftershock sizes and temporal decay are well described by empirical laws (e.g., Bath’s law and Omori’s law), but explaining and forecasting the spatial distribution of aftershocks has proven more difficult. Static elastic Coulomb failure stress change is perhaps the most commonly invoked criterion to explain
- [Three-Dimensional Rupture Dynamics of Tsunamigenic Earthquakes Incorporating Inelastic Wedge Failure](https://www.seismosoc.org/presentations/three-dimensional-rupture-dynamics-of-tsunamigenic-earthquakes-incorporating-inelastic-wedge-failure/) - Shallow subduction zones (upper 10 – 15 km) host earthquakes of anomalous attributes. These earthquakes occur on shallow-dipping plate interfaces (dips less than ~15°) but are efficient in tsunamigenesis. They also have abnormally slow rupture velocity, long rupture duration, depletion in high-frequency radiation, and low moment-scaled radiated energy. Any good tsunamigenic earthquake models need to
- [Seismicity in the Northern Hikurangi Margin, New Zealand, and Spatial and Temporal Relationship with the October 2014 Slow Slip Event](https://www.seismosoc.org/presentations/seismicity-in-the-northern-hikurangi-margin-new-zealand-and-spatial-and-temporal-relationship-with-the-october-2014-slow-slip-event/) - The Hikurangi subduction margin off the north island of New Zealand was the target of the “Hikurangi Ocean Bottom Investigation of Tremor and Slow Slip” (HOBITSS) experiment, which successfully recorded a slow slip event on seafloor pressure gauges in 2014. In addition to 24 absolute pressure gauges, the HOBITSS experiment included 10 broadband and 5
- [Evolution of Aftershock Sequences Based on the Geometry of Successive Focal Mechanisms](https://www.seismosoc.org/presentations/evolution-of-aftershock-sequences-based-on-the-geometry-of-successive-focal-mechanisms/) - Detailed studies of the evolution of aftershock sequences have focused overwhelmingly on the timing and location of individual earthquakes and their interpretation in terms of empirical and physical models of stress transfer controlled by the mainshock alone or by the mainshock and only the largest aftershocks. While the gross spatial and temporal features of aftershock
- [High Resolution Travel Time Tomography with Local Sparsity Regularization and Dictionary Learning, with Application to Ambient Noise Tomography on a Dense Seismic Array](https://www.seismosoc.org/presentations/high-resolution-travel-time-tomography-with-local-sparsity-regularization-and-dictionary-learning-with-application-to-ambient-noise-tomography-on-a-dense-seismic-array/) - We present a 2D travel time tomography method which models rectangular groups of slowness pixels from discrete slowness maps, called patches, as sparse linear combinations of atoms from a dictionary. We further propose to adapt the dictionary atoms to slowness data using dictionary learning, a form of unsupervised machine learning. We call this sparse regularization
- [Minimum 1D Velocity Model For The Central Ecuadorian Subduction Zone Inferred From The Aftershock Sequence Of The 2016 Mw 7.8 Pedernales Earthquake](https://www.seismosoc.org/presentations/minimum-1d-velocity-model-for-the-central-ecuadorian-subduction-zone-inferred-from-the-aftershock-sequence-of-the-2016-mw-7-8-pedernales-earthquake/) - On 16th April 2016 a MW 7.8 earthquake occurred in the Pedernales region located in the central coastal segment of Ecuador. Immediately after the earthquake a dense temporary network (20-30 km in-between-station distance) was deployed in collaboration with several international institutions covering the rupture area (approximately 120 x 50 km). Instrumentation included OBS, strong motion,
- [The September 2017 Earthquakes in Mexico from Social Media](https://www.seismosoc.org/presentations/the-september-2017-earthquakes-in-mexico-from-social-media/) - After the earthquakes of September 7 (local time) and 19, 2017, in Mexico, much of the activity of Mexican seismologists has clarified the popular concern about the possible unique characteristics of these. From another point of view, a particularity is evident: the most significant earthquakes and consequences in Mexico have been social media. In perspective,
- [Training a Deep Neural Network to Generate Full Seismograms](https://www.seismosoc.org/presentations/training-a-deep-neural-network-to-generate-full-seismograms/) - Easy and fast access to synthetic waveforms is paramount for a myriad of applications in seismology and various approximate techniques for their calculation have been developed over the decades; each with their own shortcomings and trade-offs. Realistic numeric calculations through three dimensional complex media at high frequencies on the other hand are computationally too expensive
- [Simulation-Based Evaluation for Probabilistic Seismic Hazard Models - A Case Study for Japan](https://www.seismosoc.org/presentations/simulation-based-evaluation-for-probabilistic-seismic-hazard-models-a-case-study-for-japan/) - A probabilistic seismic hazard analysis (PSHA) considers the occurrence of seismic strong ground motions as a random process. The performance of a PSHA, therefore, can only be evaluated in a statistical sense. The hazard curve and the hazard map are the most common forms to disseminate the results of a PSHA. They do not convey
- [Deep Convolutional Neural Networks for Phase Picking in Oklahoma Based on Transfer Learning](https://www.seismosoc.org/presentations/deep-convolutional-neural-networks-for-phase-picking-in-oklahoma-based-on-transfer-learning/) - Oklahoma has experienced an abrupt increase of induced seismicity in the last decade. Detection of small-magnitude earthquakes is essential because a complete earthquake catalog is the basis for understanding injection-induced seismicity in Oklahoma. Machine learning, especially deep learning, provides robust tools for image classification and feature extraction with complex structures. Convolutional neural networks (CNN) have
- [Verification of the Probabilistic Seismic Hazard Maps for Japan by Comparing with Actually Observed Seismic Intensities](https://www.seismosoc.org/presentations/verification-of-the-probabilistic-seismic-hazard-maps-for-japan-by-comparing-with-actually-observed-seismic-intensities/) - The Probabilistic Seismic Hazard Maps for Japan (PSHMJ) have been criticized after the 2011 Tohoku earthquake. For example, Geller (2011) complained that recent damaging earthquakes occurred in places assigned a relatively low probability in the 2010 PSHMJ map of Intensity 6- or greater in 30 years. However, Miyazawa and Mori (2009, 2010) constructed maximum seismic
- [Earthquake Statistics in the Eastern Tennessee and New Madrid Seismic Zones Are Inconsistent with Ongoing Aftershock Sequences](https://www.seismosoc.org/presentations/earthquake-statistics-in-the-eastern-tennessee-and-new-madrid-seismic-zones-are-inconsistent-with-ongoing-aftershock-sequences/) - A key challenge to understanding intraplate seismic hazard is separating aftershock sequences that are not representative of long-term earthquake rates. First, we use modern frequency-magnitude relations to investigate whether high seismicity rates in the Eastern Tennessee Seismic Zone (ETSZ) are plausibly a transient response to a large but unknown prehistoric event. The expected rate of
- [Contributions of Modern Seismic Imaging to Understanding the Andean Convergent Margin](https://www.seismosoc.org/presentations/contributions-of-modern-seismic-imaging-to-understanding-the-andean-convergent-margin/) - Improved seismic images of the South American convergent margin are providing new insights to longstanding tectonic problems including: (1) the formation and destruction of thick continental crust, (2) the influence of flat slab subduction on the over-riding plate, and (3) the role of slab morphology on mountain building. We have used data from over 1000
- [The M8.2 and M7.1 September Seismic Events in Mexico: A Perspective from the Strong Motion Recording Center at UNAM](https://www.seismosoc.org/presentations/the-m8-2-and-m7-1-september-seismic-events-in-mexico-a-perspective-from-the-strong-motion-recording-center-at-unam/) - The operation of the Strong Motion Network at the Institute of Engineering and the strengthening of its recording center´s infrastructure for the monitoring of the seismic activity of the country, have allowed having timely information after the occurrence of an earthquake. The availability of 264 accelerometric signals received in real time (36 three-component stations from
- [Implementing Inter-Period Correlations into the SDSD Broadband Ground Motion Method](https://www.seismosoc.org/presentations/implementing-inter-period-correlations-into-the-sdsd-broadband-ground-motion-method/) - Earthquake ground motion records reveal period-dependent correlations, which has implication for seismic risk (Bayless and Abrahamson, 2017). The empirical inter-period correlations of epsilon (the residual between simulations and the mean of the simulations in Fourier Amplitude Spectra (FAS) space) using the Effective Amplitude Spectrum (EAS) computed from the PEER NGA-West2 database resemble a two-sided exponential
- [The Western Limit of Major Extension Associated with the Iapetan Rifted Margin in the Southern and Central Appalachians: Implications for the National Seismic Hazard Maps](https://www.seismosoc.org/presentations/the-western-limit-of-major-extension-associated-with-the-iapetan-rifted-margin-in-the-southern-and-central-appalachians-implications-for-the-national-seismic-hazard-maps/) - Specifying the location and extent of rifted crystalline crust (Precambrian basement) associated with the opening of the Iapetus Ocean in the eastern United States is important for seismic hazard evaluation. As currently mapped by the Central and Eastern U.S. Seismic Source Characterization for Nuclear Facilities (CEUS-SSC) Project, the western limit of major extensional faults and
- [High Resolution Imaging of the Plate Interface in Central Alaskan Subduction Zone Using Autocorrelation with Local Earthquakes](https://www.seismosoc.org/presentations/high-resolution-imaging-of-the-plate-interface-in-central-alaskan-subduction-zone-using-autocorrelation-with-local-earthquakes/) - The physical properties of subducting slabs at convergent plate boundaries impact megathrust seismicity and arc volcanism, but remain incompletely understood. Slabs features are primarily imaged using phases from teleseismic earthquakes at frequencies below 1 Hz, resulting in low-resolution images. Local earthquake sources with frequencies of ≥10 Hz on the other hand, provide a potential means
- [Rapid Earthquake-Induced Damage Detection Using Satellite Imagery and Machine Learning Algorithms for the September 19, 2017, M7.1 Central Mexico Earthquake](https://www.seismosoc.org/presentations/rapid-earthquake-induced-damage-detection-using-satellite-imagery-and-machine-learning-algorithms-for-the-september-19-2017-m7-1-central-mexico-earthquake/) - Rapid detection and classification of damage after earthquakes is important for loss estimation, rapid response, and research. We use optical satellite imagery after the recent M 7.1 Central Mexico earthquake on September 19, 2017 to develop a damage catalog for Mexico City. The satellite imagery before and after the earthquake are freely available through the
- [A Convolutional Neural Network for Intermediate-Depth Earthquake Detection and Magnitude Estimation](https://www.seismosoc.org/presentations/a-convolutional-neural-network-for-intermediate-depth-earthquake-detection-and-magnitude-estimation/) - Earthquake detection remains one of the fundamental operations in observational seismology. Despite the explosion in quality and quantity of seismic data our ability to build dense and complete seismicity catalogs remains limited. Recent approaches exploit the self-similarity of earthquakes and rely on using the waveforms of a few well known events as templates. Terabytes of
- [NGA-Subduction Research Program](https://www.seismosoc.org/presentations/nga-subduction-research-program/) - This presentation provides an overview of the NGA-Sub, a large multidisciplinary community-based research initiative to develop a comprehensive ground-motion database and multiple ground-motion models (GMMs) for subduction events. In this community-based project, we developed a database of ground motions recorded in worldwide subduction events. The database includes the processed recordings and supporting source, path, and
- [Exploring the Uncertainty of Earthquake Catastrophe Models Through a Risk Assessment Study in Central America Using Openquake and a Vendor Cat Model](https://www.seismosoc.org/presentations/exploring-the-uncertainty-of-earthquake-catastrophe-models-through-a-risk-assessment-study-in-central-america-using-openquake-and-a-vendor-cat-model/) - Central America has been the focus of many recent seismic risk studies, carried out for both public and private purposes. Public risk assessments are usually carried out for risk mitigation purposes so that the public are informed of the risk, building codes can be improved and emergency plans can be made. Private risk assessments carried
- [Simulations of Data Based Scenarios to Investigate the Significance of Data Quality in Seismicity Studies](https://www.seismosoc.org/presentations/simulations-of-data-based-scenarios-to-investigate-the-significance-of-data-quality-in-seismicity-studies/) - Studying the earthquake processes involves the exploration of the available data to extract all possible information required for the deeper understanding of the underlying physical mechanisms. When a theoretical concept, in the form of a physical and/or statistical model, is developed and applied, data of the best possible quality (in terms of precision, sample size
- [Nonlinear Seismic Soil-Structure Interaction Analysis of Long-Span Railway Bridge Subjected to Different Earthquake Ground Motions](https://www.seismosoc.org/presentations/nonlinear-seismic-soil-structure-interaction-analysis-of-long-span-railway-bridge-subjected-to-different-earthquake-ground-motions/) - In this paper, the dynamic behavior of an existing long-span railway bridge in Afyon-Turkey, subjected to different earthquake ground motion is investigated. In this study a full two-dimensional finite element model of the railway bridge system was established, in which the soil-structure interactions were considered. Time domain dynamic analyses of the bridge-soil models and also
- [The Gutenberg-Richter Law and Completeness of the RSN Earthquake Catalog, Costa Rica](https://www.seismosoc.org/presentations/the-gutenberg-richter-law-and-completeness-of-the-rsn-earthquake-catalog-costa-rica/) - Costa Rica is characterized by a high seismicity due to its location in a subduction zone and near to the triple point of the plates Coco, Caribbean and Nazca. This study evaluates the stability of the mean rate earthquake occurrence and the spatial and temporal distribution of seismicity in Costa Rica, in order to calculate
- [The Case for Mean Rupture Distance in Ground Motion Estimation](https://www.seismosoc.org/presentations/the-case-for-mean-rupture-distance-in-ground-motion-estimation/) - We discuss the virtues of mean rupture distances, which are more physically representative of the distance to an earthquake and are simpler to use than minimum distances. The arithmetic, geometric, harmonic, and root-mean-squared (RMS) distances are examples of a mean distance, in contrast to minimum distances such as rupture- or Joyner-Boore distance. To accurately model
- [Turing-Style Tests for Synthetic Earthquake Catalogs](https://www.seismosoc.org/presentations/turing-style-tests-for-synthetic-earthquake-catalogs/) - Epidemic-Type Aftershock Sequence (ETAS) catalogs generated from the 3rd Uniform California Earthquake Rupture Forecast (UCERF3) model are unique in that they are the first to combine a complex, fault-based long-term forecast with short-term earthquake clustering statistics. We present Turing-style tests to examine whether these synthetic catalogs can successfully imitate observed earthquake behavior in California. We
- [Spectral Monitoring of Rock Arches](https://www.seismosoc.org/presentations/spectral-monitoring-of-rock-arches/) - The delicate geometry of natural rock arches creates a unique spectral signature that enables non-invasive monitoring for structural damage. We identify and characterize resonant frequencies of arches by calibrating measured spectral attributes from sparse broadband arrays with 3D numerical modal analysis. The resulting model allows us to visualize mode shapes and infer bulk material properties.
- [A Study to Define the Long-Period Corner Periods for Code-Based Displacement Spectrum](https://www.seismosoc.org/presentations/a-study-to-define-the-long-period-corner-periods-for-code-based-displacement-spectrum/) - Proper definitions of elastic horizontal pseudo-acceleration (PSa) and displacement (Sd) spectra for a wide spectral period range have become more and more important because the implementation of displacement-based design is now well-established among the earthquake engineering community. The reliability and consistency between PSa and Sd is also important for probability-based seismic damage assessment (PBSDA) because
- [Probabilistic Seismic Hazard Analysis in Mexico City Using Synthetic Seismograms and Three-Dimensional Models](https://www.seismosoc.org/presentations/probabilistic-seismic-hazard-analysis-in-mexico-city-using-synthetic-seismograms-and-three-dimensional-models/) - We present a comparison of Probabilistic Seismic Hazard Analyses computed at reference sites in Mexico City using Ground Motion Prediction Equations (GMPE) and synthetic seismograms. The computation of the latter is achieved by using a hybrid approach employing the Strain Green's Tensor (SGT) formalism (e.g., Lee et al., 2011) with a realistic 3D model of
- [Environmental Seismology – An Indispensable Tool to Constrain Drivers, Precursors and Evolution of Mass Wasting Processes](https://www.seismosoc.org/presentations/environmental-seismology-an-indispensable-tool-to-constrain-drivers-precursors-and-evolution-of-mass-wasting-processes/) - Mass wasting processes such as rock falls, debris flows and land slides are often the initial elements of sediment cascades that shape the Earth’s surface, from high mountain peaks to the ocean basins, and they are driven by intrinsic and extrinsic mechanisms. While these drivers can usually be measured straightforwardly by classic approaches, the actual
- [Reducing Uncertainties of Ground Motion Estimations - The Effect of Rupture Directivity](https://www.seismosoc.org/presentations/reducing-uncertainties-of-ground-motion-estimations-the-effect-of-rupture-directivity/) - Ground motions are in first order a function of magnitude and distance of a given earthquake; this observation is fundamental in the study of earthquakes, and is widely used for the different estimation of earthquake magnitudes. However, in the second order and above, there is a wide range of factors affecting ground motions, and in
- [Toward a Unified Metric for Sufficiency and Efficiency of Scalar Earthquake Intensity Measures](https://www.seismosoc.org/presentations/toward-a-unified-metric-for-sufficiency-and-efficiency-of-scalar-earthquake-intensity-measures/) - Earthquake Intensity Measures (IM) are commonly employed in seismic risk assessment to link seismological parameters (M, R, ε) with Engineering Demand Parameters (EDP). Consequently, the selection of appropriate IMs consistent with the structural type and location has become increasingly important using criteria such as efficiency (standard deviation in EDP given an IM) and sufficiency (conditional
- [Attribute Index and Classification Method of Earthquake Damage Photos for Seismic Risk](https://www.seismosoc.org/presentations/attribute-index-and-classification-method-of-earthquake-damage-photos-for-seismic-risk/) - In order to deal more effectively with the future earthquake risk, two important issues need to be solved: 1. How can the government and the public imagine the disaster scenario caused by the earthquake risk in these areas? 2. Can officials and the general public systematically see the damage caused by historical earthquakes in the
- [Spatiotemporal Seismic Hazard and Risk Assessments for Large Aftershocks Triggered by Mega-Thrust Subduction Earthquakes in Japan](https://www.seismosoc.org/presentations/spatiotemporal-seismic-hazard-and-risk-assessments-for-large-aftershocks-triggered-by-mega-thrust-subduction-earthquakes-in-japan/) - Large historical mega-thrust subduction earthquakes, such as the 2004 Aceh-Andaman, 2010 Maule, and 2011 Tohoku earthquakes, have triggered numerous aftershocks in subduction plate interfaces and continental crusts. The crustal seismicity occurs much closer to the population and buildings than the subduction earthquake which is likely to occur with a larger magnitude and at a greater
- [Lateral Spreading Analyses of the Existing Shoreline at Treasure Island](https://www.seismosoc.org/presentations/lateral-spreading-analyses-of-the-existing-shoreline-at-treasure-island/) - Treasure Island is located in the central San Francisco Bay, immediately north of Yerba Buena Island, between the active San Andreas and Hayward faults. Treasure Island was constructed by placing hydraulic sand fill over natural shoal deposits within perimeter rock dikes. The natural shoal deposit consists of layers of clean sand, silty sand, and lenses
- [Tracking Groundwater Levels Using the Ambient Seismic Field](https://www.seismosoc.org/presentations/tracking-groundwater-levels-using-the-ambient-seismic-field/) - Aquifers are vital groundwater reservoirs for domestic, agricultural, and industrial activities worldwide. Tracking their state with high temporal and spatial resolution is critical for water resource management, yet rarely achieved from a single data set. Here, we show that groundwater level varitions can be mapped at basin-scale using perturbations in seismic velocity, dv/v. We recover
- [EDGE: Towards Extreme-Scale Nonlinear Earthquake Simulations](https://www.seismosoc.org/presentations/edge-towards-extreme-scale-nonlinear-earthquake-simulations/) - We present the status of recent and ongoing extensions to the Extreme-scale Discontinuous Galerkin Environment (EDGE) for seismic wave propagation. EDGE uses the Discontinuous Galerkin (DG-) Finite Element Method (FEM) to solve hyperbolic partial differential equations. EDGE targets seismic model setups with high geometric complexity and extreme-scale ensemble simulations, using beyond 500,000 computer cores. Exploitation
- [Seismic Risk Assessment in Areas with Low-Quality Data: The Case of the Jama-Pedernales 7.8mw Earthquake and the Detailed Study of Portoviejo (Ecuador) – Part 2: Risk Quantification](https://www.seismosoc.org/presentations/seismic-risk-assessment-in-areas-with-low-quality-data-the-case-of-the-jama-pedernales-7-8mw-earthquake-and-the-detailed-study-of-portoviejo-ecuador-part-2-risk-quantification/) - In order to obtain sound risk assessments, it is important to quantify, among others, building characteristics and socioeconomic and environmental, attributes of the potential impacted area. Risk assessment studies conducted at detailed scale (individual dwellings) are not common because of difficulties in getting the appropriate data both, at the intensity of shaking and at the
- [Urban Liquefaction Mapping for Water System Seismic Reliability, Portland, Oregon](https://www.seismosoc.org/presentations/urban-liquefaction-mapping-for-water-system-seismic-reliability-portland-oregon/) - Conventional regional-scale urban liquefaction hazard analyses are typically performed using surficial geologic data, supplemented by representative but often limited subsurface data. These studies often do not fully capture the complicated subsurface stratigraphy critical to characterizing the distribution and thickness of strata potentially susceptible to liquefaction or associated lateral spreading that is damaging to distributed lifeline
- [NGL: An Open Source Global Database for Next-Generation of Liquefaction Assessment](https://www.seismosoc.org/presentations/ngl-an-open-source-global-database-for-next-generation-of-liquefaction-assessment/) - The Next-Generation Liquefaction (NGL) project is a multi-year community-based research effort with the main goal of developing improved procedures to evaluate liquefaction susceptibility, triggering, and consequences. The NGL project consists of three components (1) an open-source case-history database, (2) supporting studies aiming to capture specific effects not constrained by data, and (3) model development. This
- [Analysis of the Effect of Near Surface Slips on Strong Ground Motion: An Example of the Main Shock of the 2016 Kumamoto Earthquakes](https://www.seismosoc.org/presentations/analysis-of-the-effect-of-near-surface-slips-on-strong-ground-motion-an-example-of-the-main-shock-of-the-2016-kumamoto-earthquakes/) - The main shock of the 2016 Kumamoto earthquakes occurred on April 16, 2016, at 01:25 (JST), with Mw7.0. The rupture of the crustal earthquake reached to the surface and more than 30 km of surface ruptures appeared after the earthquake. Strong motions around the surface ruptures showed large peak velocities and permanent displacements, which could
- [The Caribe Norte Project: Studying the Southern Hispaniola Island Seismic Structure Using OBS](https://www.seismosoc.org/presentations/the-caribe-norte-project-studying-the-southern-hispaniola-island-seismic-structure-using-obs/) - The complex tectonic region of NE Caribbean, where Hispaniola and Puerto Rico are located, is bordered by subduction zone with oblique convergence in the north and by incipient subduction zone associated to Muertos Trough in the south accommodated by the Septentrional-Oriente and Enriquillo-Plantain Garden Fault Zones. Central Caribbean basin is characterized by the presence of
- [Deterministic Seismic Hazard Analyses of Victoria, British Columbia, Canada: Considering an Active Leech River Fault](https://www.seismosoc.org/presentations/deterministic-seismic-hazard-analyses-of-victoria-british-columbia-canada-considering-an-active-leech-river-fault/) - The Leech River fault is situated on Vancouver Island near the city of Victoria, British Columbia, Canada. The ~60 km transpressional reverse fault zone runs from east to west along the southern tip of Vancouver Island, dividing the lithologic units of metamorphic Jurassic-Cretaceous Leech River Complex to the north and igneous Eocene Metchosin formation to
- [Integrated Geophysical Study of the Kingston Metropolitan Area Using Ambient Noise](https://www.seismosoc.org/presentations/integrated-geophysical-study-of-the-kingston-metropolitan-area-using-ambient-noise/) - The Kingston Metropolitan Area (KMA) is the largest and most populous city that serves as the centre of industry and commerce, as well as the capital, of the island-nation Jamaica at the north Caribbean Sea. Most of the KMA is built on the alluvium Liguanea Formation while the city outskirts overlay the White Limestone Supergroup
- [Overview and Testing Validation of NSHM for Japan with Earthquake Records](https://www.seismosoc.org/presentations/overview-and-testing-validation-of-nshm-for-japan-with-earthquake-records/) - We conduct the national seismic hazard maps(NSHM) for Japan (2005~present) under the guidance of the Headquarters for Earthquake Research Promotion of Japan(HERP). The recent destroyed earthquakes have occurred in three earthquake source categories of EQ-Ⅰ: Subduction-zone large earthquakes; EQ-Ⅱ: Subduction-zone earthquakes without specified source faults, and EQ-Ⅲ: Shallow earthquakes in-land and offshore regions. The various
- [Ground Motion Simulation and Topography Amplification Effect on an ms6.6 Minxian Earthquake](https://www.seismosoc.org/presentations/ground-motion-simulation-and-topography-amplification-effect-on-an-ms6-6-minxian-earthquake/) - An Ms6.6 Minxian earthquake occurred on July 22, 2013. It triggered a lot of landslides and caused severe economic losses and casualties. However, only a few seismic records were gathered in the areas of landslides. In order to provide enough ground motion parameters for seismic landslide analysis, this paper established 3-dimensional regional underground medium velocity
- [Crustal Structure in the Pantanal and Chaco Basin from Receiver Function](https://www.seismosoc.org/presentations/crustal-structure-in-the-pantanal-and-chaco-basin-from-receiver-function/) - Crustal structure is an important parameter in global and regional seismic studies. A widely used method to obtain important features of the crust and upper mantle is receiver function, that uses teleseismic data (in distances raging from 30 to 95 degrees). In Brazil it began to be utilized since 1993, however there is still a
- [Tracking Tropical Cyclones with Backprojection](https://www.seismosoc.org/presentations/tracking-tropical-cyclones-with-backprojection/) - Tropical cyclones (hurricanes and typhoons) are mostly atmospheric phenomena but they also generate significant ground motions in the solid earth when they become strong. Previous studies have shown it is possible to track and monitor hurricanes that pass through dense seismic networks on land (Tanimoto and Valovcin, 2015). This limits the amount of hurricanes available
- [Insights from Operations of the U.S. Ocean Bottom Seismograph Instrument Pool](https://www.seismosoc.org/presentations/insights-from-operations-of-the-u-s-ocean-bottom-seismograph-instrument-pool/) - Over the past six years, the U.S. Ocean Bottom Seismograph Instrument Pool has undertaken a wide range of experiments. These experiments have addressed diverse scientific objectives through the deployment of instruments at different scales, geometries, water depths, and seasons. Overall, the experiments have been characterized by excellent instrument return rates, generally high data return, and
- [Spatial Improvement in the Location of Mid-Alaska Faults Using the Condensation Method](https://www.seismosoc.org/presentations/spatial-improvement-in-the-location-of-mid-alaska-faults-using-the-condensation-method/) - Statistical methods have proven to be of significant help in extracting hidden information from a huge amount of data available in different scientific areas such as seismology. In this research, potentially active faults in mid-Alaska are investigated by means of one of these statistical approaches, called the condensation method, introduced by Kamer et al. (2015).
- [ShakeMaps for Nicaragua and Central America Based on Seiscomp3 at INETER](https://www.seismosoc.org/presentations/shakemaps-for-nicaragua-and-central-america-based-on-seiscomp3-at-ineter/) - Since 2016 SED and INETER are working jointly to build a prototype earthquake early warning and earthquake rapid information system for Nicaragua and also potentially for other countries in Central America (CAM). The project primarily requires implementing and testing state-of-the-art software and standard seismological services / tools in Nicaragua, and optimising the seismic network performance
- [Western Eger Rift in Central Europe: Active Magmatic Emplacement from Combined Seismological and Isotope Study](https://www.seismosoc.org/presentations/western-eger-rift-in-central-europe-active-magmatic-emplacement-from-combined-seismological-and-isotope-study/) - Seismicity at lithospheric plate boundaries can be accompanied by magmatic processes, which play fundamental role in formation and differentiation of the Earth’s crust. These processes are connected with magmatic emplacement as a result of an ongoing magmatic activity at the lower crustal level. Though they are usually confined to lithospheric plate boundaries, they can also
- [Lithospheric Structure beneath Northwestern Venezuela from Deep Seismic Profiling](https://www.seismosoc.org/presentations/lithospheric-structure-beneath-northwestern-venezuela-from-deep-seismic-profiling/) - Northwestern Venezuela is located in a zone of complex deformation due to the Caribbean-South American plate interactions. Several models regarding the shallow and deep structure of the region have been proposed. Nevertheless, most of these studies are based on basin-scale observations, and they lack crustal observations in order to support the interpretation of lithospheric structures.
- [Preliminary Soil Characterization of the Most Affected Coastal Villages after the 16 April 2016 Mw 7.8 Pedernales Earthquake, Ecuador](https://www.seismosoc.org/presentations/preliminary-soil-characterization-of-the-most-affected-coastal-villages-after-the-16-april-2016-mw-7-8-pedernales-earthquake-ecuador/) - On April 16, 2016, a large part of the Ecuadorian coast was shacked by an Mw7.8 earthquake, affecting nearly 30,000 homes and public buildings. Understanding soil characteristics of these affected areas is a necessary and useful aid to reconstruction efforts. To this end, the Instituto Geofísico at the Escuela Politécnica Nacional (IG-EPN) undertook data collection
- [Characterizing the Temporal and Spatial Distribution of Earthquake Swarms in the Puerto Rico - Virgin Island Block](https://www.seismosoc.org/presentations/characterizing-the-temporal-and-spatial-distribution-of-earthquake-swarms-in-the-puerto-rico-virgin-island-block/) - The presence of Tectonic Earthquake Swarms (TES) and sequences in the north and northeast of the island of Puerto Rico in the northeastern Caribbean have been recorded by the Puerto Rico Seismic Network (PRSN) since it started operations in 1974. A great wealth of seismic data has been archived during this period such that at
- [Implementation of the Tsunami Ready Pilot Project in Grenada](https://www.seismosoc.org/presentations/implementation-of-the-tsunami-ready-pilot-project-in-grenada/) - The Tsunami Ready Pilot Project is a community performance based recognition project for coastal communities interested in strengthening their tsunami preparedness, adapting and adopting good practices to minimize loss of life and property. Ten important elements are considered in the pilot project guidelines, divided in three major components: mitigation, preparedness and response. Grenada is a
- [Hvsr Site Characterization of Texnet Seismic Stations in West Texas](https://www.seismosoc.org/presentations/hvsr-site-characterization-of-texnet-seismic-stations-in-west-texas/) - The Texas Seismological Network, established by the 84th session of the Texas State Legislature, currently consists of 25 stations that comprise a backbone network across the state, supplemented by several portable arrays in four areas of localized seismicity. All portable installations have both a seismometer and an accelerometer. One array, located in the Snyder-Cogdell area,
- [Near-Surface Elastic Changes in the Ross Ice Shelf Arising from Transient Storm and Melt Forcing Observed with High-Frequency Ambient Seismic Noise](https://www.seismosoc.org/presentations/near-surface-elastic-changes-in-the-ross-ice-shelf-arising-from-transient-storm-and-melt-forcing-observed-with-high-frequency-ambient-seismic-noise/) - Ice shelf collapse can herald subsequent grounded ice instability. However, robust understanding of external mechanisms capable of triggering rapid changes remains elusive. Improved understanding therefore requires improved remote and in-situ measurements of ice shelf properties and the environmental processes that can affect them. Using nearly three years of continuous data from a recently deployed 34-station
- [Active-Source Investigations of Lemon Creek Glacier, Alaska, Using Nodal Seismometers and a Betsy Seismic Gun Source](https://www.seismosoc.org/presentations/active-source-investigations-of-lemon-creek-glacier-alaska-using-nodal-seismometers-and-a-betsy-seismic-gun-source/) - The use of seismology as a means to study glacier dynamics has rapidly expanded in recent years as we seek to better understand the present and future behaviour of glaciers in a rapidly changing climate. While smaller in mass than their Antarctic or Greenlandic cousins, sub-arctic mountain glaciers may be particularly vulnerable to rapid changes
- [Development of UNAM Institute of Engineering Multipurpose Seismic Data Logger](https://www.seismosoc.org/presentations/development-of-unam-institute-of-engineering-multipurpose-seismic-data-logger/) - We present a low-cost seismic recording system intended to fulfill multiple seismic experiments and monitoring. The instrument was designed and crafted at the Institute of Engineering of the National Autonomous University of Mexico with the main objective of expanding the strong ground motion network and the pool of instruments for site and crustal characterization. The
- [Comparison of Observed and Synthetic Dynamic Ground Strains and Rotations in the Near-Fault Region of the 2004 Parkfield Earthquake](https://www.seismosoc.org/presentations/comparison-of-observed-and-synthetic-dynamic-ground-strains-and-rotations-in-the-near-fault-region-of-the-2004-parkfield-earthquake/) - Several studies have generated low-frequency dynamic ground deformations (strains and rotations) in the near-fault region of actual or hypothetical earthquakes using physics-based simulation techniques that incorporate modeling of the seismic source and wave propagation processes. However, no systematic attempt has been made to compare observed and synthetic near-fault dynamic ground strains and rotations in order
- [Teleseismic P-Wave Coda Auto-Correlations versus P-Wave Receiver Functions : A Case Study from the Mackenzie Mountains, Yukon, Canada, and Utility for Icecap and Ice Shelf Stations](https://www.seismosoc.org/presentations/teleseismic-p-wave-coda-auto-correlations-versus-p-wave-receiver-functions-a-case-study-from-the-mackenzie-mountains-yukon-canada-and-utility-for-icecap-and-ice-shelf-stations/) - Auto-correlation of teleseismic P-wave coda is a recently developed technique capable of imaging crustal-scale features based on reflection signals from seismic discontinuities. Traditional P-wave receiver function analysis maps velocity contrasts based on P-to-S conversions and has been well utilized in a great many locations, but encounters difficulties in seismically complex environments: for example, where high
- [Shallow Rigidity Structure From Low-Frequency Wind-Induced Ground Motions Using Co-Located Pressure and Seismic Sensors](https://www.seismosoc.org/presentations/shallow-rigidity-structure-from-low-frequency-wind-induced-ground-motions-using-co-located-pressure-and-seismic-sensors/) - Using data from the USArray Transportable Array (TA) stations and the Southern California Network, we analyzed the wind-induced ground motions recorded by the co-located seismometers and pressure sensors in these networks. Adopting a model by Sorrells (1971), we formulated an equation to retrieve shallow rigidity structure from the co-located seismic and barometric data at low
- [Modeling the Tsunami Potential along the Pacific Coast of Central America](https://www.seismosoc.org/presentations/modeling-the-tsunami-potential-along-the-pacific-coast-of-central-america/) - At least 40 tsunamis have been generated along the Middle America Trench, according with tsunami catalogs. There are no records of mega earthquakes originated there; probably associated to the low coupling in some sections and the presence of seismic barriers. However, moderate ruptures have caused important tsunami runups in the region. The 1992 Nicaragua Mw
- [Constraints on the Source Mechanism of the Damaging Seismic Event of August 21, 2017, on Ischia Island (Southern Italy)](https://www.seismosoc.org/presentations/constraints-on-the-source-mechanism-of-the-damaging-seismic-event-of-august-21-2017-on-ischia-island-southern-italy/) - On Aug. 21, 2017, a MD4.0 earthquake struck Ischia island, claiming two lives and provoking severe building damages, disproportionate to the moderate magnitude of the event. Hypocenter locations based on arrival times were afflicted by a large uncertainty and the proposed moment tensor solutions resulted inconsistent among themselves. These contradictory observations gave motivation to recalculate
- [Comparative Study of Earthquake Clustering in Relation to Hydraulic Activities at Geothermal Fields in California](https://www.seismosoc.org/presentations/comparative-study-of-earthquake-clustering-in-relation-to-hydraulic-activities-at-geothermal-fields-in-california/) - We investigate earthquake clustering properties from three geothermal reservoirs to clarify how earthquake patterns respond to hydraulic activities. We process ≈ 9 years from four datasets corresponding to the Geysers (both the entire field and a local subset), Coso and Salton Sea geothermal fields, California. For each, the completeness magnitude, b-value and fractal dimension are
- [Seismic Scattering from Topography and Small-Scale Crustal Heterogeneity: Application to the 2009 North Korean Nuclear Test](https://www.seismosoc.org/presentations/seismic-scattering-from-topography-and-small-scale-crustal-heterogeneity-application-to-the-2009-north-korean-nuclear-test/) - We simulate high-frequency (0-4 Hz) wave propagation to regional distances for the 2009 North Korea Nuclear Test (NKNT) using the SALSA3D velocity model. In our simulations, we address two major causes of generation of high-frequency energy - (1) crustal scattering due to small-scale velocity and density perturbations, and (2) scattering due to surface topography. We
- [Sks Seismic Anisotropy Observations in Mid-Plate South America : Investigating Mantle Flow and Effects of Cratonic Keels](https://www.seismosoc.org/presentations/sks-seismic-anisotropy-observations-in-mid-plate-south-america-investigating-mantle-flow-and-effects-of-cratonic-keels/) - Seismic anisotropy at continental regions, mainly in stable areas, gives important information about past and present tectonic events and helps us in understanding patterns of upper mantle flow in a way not achieved by other methods. The measurement of shear wave splitting (SWS), at individual stations, from core refracted phases (such as SKS phases), indicates
- [A New Ground-Motion Model for Iran](https://www.seismosoc.org/presentations/a-new-ground-motion-model-for-iran/) - In this study, we develop a new ground motion model for Iran which consists of four seismic regions: (1) Zagros, a continental-continental collision zone of Arabian plate and Central Iranian Microcontinent, (2) Alborz-Azarbaijan located in north and northwest Iran and it is part of Alpine-Himalayan seismic belt, (3) Kope Dagh, a segment of Alpine-Himalayan seismic
- [H/ V Spectral Ratio Analysis for Site Characterization Beneath LPA (La Plata) Station, Buenos Aires, Argentina](https://www.seismosoc.org/presentations/h-v-spectral-ratio-analysis-for-site-characterization-beneath-lpa-la-plata-station-buenos-aires-argentina/) - The analysis of the horizontal to vertical Fourier amplitude spectral ratio (HVSR) is a powerful tool for investigating the local structure directly beneath the recording station. This technique has proven very convenient for estimating the fundamental frequency of soft deposits. The impedance contrast at the sediment-bedrock interface has a strong influence on the shape of
- [xQuake: Re-Imagining Regional Network Operations](https://www.seismosoc.org/presentations/xquake-re-imagining-regional-network-operations/) - xQuake provides a holistic approach to the integration of a regional seismic network’s operations from analytics through scientific and social applications. Developed by the originator of the Earthworm architecture, xQuake leverages emerging technologies in the fields of streaming microservices, AI based adaptive analytics, cloud/local fusion, graph structured archival storage, and WebGL enabled visualization. While in
- [Application of Active- and Passive-Seismic Array Techniques at Hard Rock Sites in Eastern Canada](https://www.seismosoc.org/presentations/application-of-active-and-passive-seismic-array-techniques-at-hard-rock-sites-in-eastern-canada/) - We aim to expand and apply the multi-channel analysis of surface waves (MASW) and ambient vibration array (AVA) methodologies to sites in Eastern Canada. We collected MASW and AVA recordings in attempts to retrieve shear-wave velocity (Vs) depth profiles at multiple seismograph stations across Eastern Canada. Dispersion curves are calculated using frequency-wavenumber (f-k) and/or spatial
- [Intensity Prediction Equations for Costa Rica](https://www.seismosoc.org/presentations/intensity-prediction-equations-for-costa-rica/) - In this study, we approximate the expected Modified Mercalli Intensity (MMI) for earthquakes in Costa Rica by calculating an Intensity Prediction Equation (IPE) and by using instrumental records. The IPE relates MMI with Magnitude (Mw) and hypocentral distance (R) and has been determined based on 3581 reported intensities from 13 recent earthquakes with magnitudes between
- [Repeating Quakes Triggered by Snow-Falls at Gugla Rock-Glacier: Transition between Stable Slip and Stick-Slip?](https://www.seismosoc.org/presentations/repeating-quakes-triggered-by-snow-falls-at-gugla-rock-glacier-transition-between-stable-slip-and-stick-slip/) - Gugla rock-glacier is located in Zermatt Valley in Switzerland. This mass of rock debris and ice is moving at about 1 cm/day by creep and slip. It has been accelerating since the last decades as a result of global warming, threatening the villages located underneath. This rock-glacier has been instrumented with a network of 6
- [Rayleigh Wave Group-Velocity across the Southern United States from Ambient Noise Tomography](https://www.seismosoc.org/presentations/rayleigh-wave-group-velocity-across-the-southern-united-states-from-ambient-noise-tomography/) - Characterizing lithospheric structure across the continental margin of the southern United States is critical to understanding the late Paleozoic accretionary history of Laurentia and the tectonics of the Alleghanian orogeny. Such a model may also shed light on the roles anomalous features such as the Sabine and Monroe Uplifts and Wiggins Arch played in the
- [Shear Wave Velocity Structure of the Lithosphere beneath the Eastern Caribbean Revealed by Ambient Noise Tomography](https://www.seismosoc.org/presentations/shear-wave-velocity-structure-of-the-lithosphere-beneath-the-eastern-caribbean-revealed-by-ambient-noise-tomography/) - We investigate shear-wave velocity structure of the eastern Caribbean lithosphere using continuous seismic records from broadband stations deployed around the study area. We construct cross-correlation functions of ambient noise for two time periods, 2003-2005 and 2011-2013, based on data availability. Phase velocities of fundamental-mode Rayleigh waves are measured from the daily-stacked cross-correlation functions using a
- [Earthquake Source Mechanisms and Their Characteristics in the Dominican Republic](https://www.seismosoc.org/presentations/earthquake-source-mechanisms-and-their-characteristics-in-the-dominican-republic/) - The island of Hispaniola, of which the Dominican Republic (DR) comprises the eastern two-thirds, is subject to a complex array of tectonic stresses. The southward-dipping North American tectonic plate is subducting obliquely under the Caribbean plate in the north, two significant transform fault systems transect the island from east to west, and the island is
- [Analysis of the Alpha Combination Rules in the Seismic Response of Typical Buildings in Mexico City](https://www.seismosoc.org/presentations/analysis-of-the-alpha-combination-rules-in-the-seismic-response-of-typical-buildings-in-mexico-city/) - Mexico City's building code considers rules to include the bidirectional building response in the design process. The so-called α combination rules account for the impact of 100% and α times the ground motion acting in orthogonal directions. Thus, it allows estimating the forces a structure will resist. Here, based on fully 3D ground motion simulations
- [Spatiotemporal Evolution of Source Properties in the Colombia Seismic Sequence](https://www.seismosoc.org/presentations/spatiotemporal-evolution-of-source-properties-in-the-colombia-seismic-sequence/) - More than 300 earthquakes have been reported by the Colombian Seismic Network (RSNC) in a seismic zone in southwestern Colombia since 2012 ranging from Ml 0.8 up to Ml 5.3, with at least 3 M4.5+ earthquakes in a span of 1 month in 2016. Some of these events have been widely felt in major cities
- [Spatial Variation of Crustal Attenuation Properties in Western Tibet](https://www.seismosoc.org/presentations/spatial-variation-of-crustal-attenuation-properties-in-western-tibet/) - Two-dimensional (2D) spatial attenuation maps are produced for the crust of western Tibet using local earthquakes which are recorded by an array of 30 broadband stations operated from July 2007 to May 2011. Initially estimation of coda waves attenuation (Qc-1 ) is done using single isotropic model and subsequently relative contribution of scattering (Qsc-1 )
- [Increased Global Seismic Sampling via Proposed Transoceanic SMART Cable Sensors – Comparing Ray Coverage through the SALSA3D Global Model](https://www.seismosoc.org/presentations/increased-global-seismic-sampling-via-proposed-transoceanic-smart-cable-sensors-comparing-ray-coverage-through-the-salsa3d-global-model/) - With the exception of isolated and largely near-shore deployments of ocean-bottom seismometers (OBSs), most seismic instrumentation is located on land, although two-thirds of Earth’s surface is covered with oceans. Large earthquakes are generally confined to subduction zones or other plate boundaries, leading to an uneven distribution of seismic sources. This heterogeneity, coupled with the land-based
- [Crustal Structure of the Amazonian Craton and Adjacent Provinces in Brazil](https://www.seismosoc.org/presentations/crustal-structure-of-the-amazonian-craton-and-adjacent-provinces-in-brazil/) - The study of the crust using receiver functions can provide valuable geological information, such as average crustal composition, its formation dynamics and the tectonic evolution of a region, as well as serve as an initial reference for the generation of seismic wave velocity models to improve earthquake location. To fill in gaps in information on
- [Detection of Seismic Signals under Low Snr Condition Using an Artificial Neural Network: Toward the Development of a Dense Low-Cost Citizen Seismic Network in Japan](https://www.seismosoc.org/presentations/detection-of-seismic-signals-under-low-snr-condition-using-an-artificial-neural-network-toward-the-development-of-a-dense-low-cost-citizen-seismic-network-in-japan/) - We have developed a low cost seismic network in Yokohama, Japan, called Citizen Seismic Network (CSN). Differently from national seismic networks that generally have high quality and high cost sensors uniformly distributed on the territory, our seismic sensors are simpler devices, but they are low cost and so they can be placed in great number
- [Basin Amplification Factors for Cascadia Estimated from the 2011 Tohoku, Japan, Earthquake](https://www.seismosoc.org/presentations/basin-amplification-factors-for-cascadia-estimated-from-the-2011-tohoku-japan-earthquake/) - There is currently a boom in the design and construction of very tall buildings in Seattle and Bellevue. The seismic responses of these buildings are controlled by the response of the Seattle basin to crustal, slab and subduction earthquakes. The design response spectrum in the ASCE 7- 10 seismic provisions uses the parameter TL to
- [Weakening of Fault Planes by Flash Melting Implies Near-Fault Anelastic Failure](https://www.seismosoc.org/presentations/weakening-of-fault-planes-by-flash-melting-implies-near-fault-anelastic-failure/) - Flash melting on real frictional contacts may greatly weaken fault surfaces with tiny slip-weakening distances of ~10 µm. This mechanism allows near-total stress drops in small even laboratory earthquakes. It also major earthquakes on the San Andreas Fault to slip at average stresses of ~10 MPa. However, the mechanism for moderate and large earthquakes implies
- [Analysis of Travel Time Curves for Puerto Rico Seismic Network Stations](https://www.seismosoc.org/presentations/analysis-of-travel-time-curves-for-puerto-rico-seismic-network-stations/) - Puerto Rico Seismic Network’s (PRSN) current 1-D crustal structure velocity model is more than 20 years old. Since then, the PRSN has increased its detection capability by increasing station coverage and upgrading existing equipment. Anecdotal evidence from senior data analysts indicate that travel time residuals vary with azimuth. Analysts have observed that data from stations
- [Seismic Structures beneath the Oklahoma Region  and the Eastern Tennessee Seismic Zone](https://www.seismosoc.org/presentations/seismic-structures-beneath-the-oklahoma-region-and-the-eastern-tennessee-seismic-zone/) - Seismicity in the eastern United States mainly occurs within localized seismic zones. A well-documented and significant increase in seismicity occurred in the Oklahoma (OK) region following increased wastewater injection associated with hydrocarbon extraction activity. Why does stable continental seismicity favor particular seismic zones? How does wastewater injection lead to increased seismicity? As a first step
- [Investigation of the Dependence of Kappa Values on the Onset of Soil Nonlinearity](https://www.seismosoc.org/presentations/investigation-of-the-dependence-of-kappa-values-on-the-onset-of-soil-nonlinearity/) - The high-frequency spectral decay parameter, kappa, is one of the most used values to describe seismic attenuations in engineering seismology. However, because of the limited number of strong ground motions from moderate-to-large earthquakes, the studies of the soil nonlinearity characteristics captured by kappa (especially the site-specific kappa component) have not received enough attention to date.
- [The Jalisco Seismic Accelerometric Telemetric Network (RESAJ)](https://www.seismosoc.org/presentations/the-jalisco-seismic-accelerometric-telemetric-network-resaj/) - The Jalisco region of western Mexico is the locus of interaction among the North America, Cocos and Rivera Plates, giving rise to the Jalisco Block. This region is one of the most tectonically active in Mexico, and includes the largest instrumentally recorded earthquake in Mexico in 1932, three important tsunamis in the last hundred years
- [The Importance of Additional Travel Times from Temporary Deployments for the Bulletin of the ISC](https://www.seismosoc.org/presentations/the-importance-of-additional-travel-times-from-temporary-deployments-for-the-bulletin-of-the-isc/) - The mission of the ISC is to maintain the definitive long-term record of global seismicity. Using the ISC services, researchers around the globe are able to request seismic arrival times, hypocentres, magnitudes, amplitudes, and other seismic parameters for either re-computed and verified data (ISC Reviewed Bulletin), or original data submitted directly by the contributing agencies.
- [Constraints on Spatial Distribution of Earthquakes within a 2-D Damaged Fault Zone in Seismic Cycles](https://www.seismosoc.org/presentations/constraints-on-spatial-distribution-of-earthquakes-within-a-2-d-damaged-fault-zone-in-seismic-cycles/) - Observations of earthquakes on major faults (e.g. San-Andreas fault system) show that the seismicity is highly concentrated along a fault-parallel narrow zone of damaged rocks. The spatial extents and material properties of the damaged fault zone can have a crucial effect on earthquake source characteristics, such as the nucleation size, recurrence interval and hypocentral locations
- [Application and Validation of a Relative Relocation Technique for Explosion Monitoring](https://www.seismosoc.org/presentations/application-and-validation-of-a-relative-relocation-technique-for-explosion-monitoring/) - Relative arrival times have been used in the past to produce relative relocations of earthquakes and explosions. Precise relocations of explosions have value in the context of the Comprehensive Nuclear-Test-Ban Treaty on-site inspection when data are available for a previous event. The Democratic People’s Republic of Korea (DPRK) has now conducted 6 declared nuclear tests
- [Study on the Uniform Earthquake Catalogue and Seismicity of Himalaya Areas](https://www.seismosoc.org/presentations/study-on-the-uniform-earthquake-catalogue-and-seismicity-of-himalaya-areas/) - Using the earthquake catalogues from China and ISC (International Seismological Centre), the uniform catalogue of Himalaya and adjacent areas has been established for the seismic hazard analysis and seismic hazard map of Himalaya areas according to according to the following principles. 1) The earthquake parameters should be taken from China catalog if the events occurred
- [MLP Networks to Associate Arrival Times in Noisy and Dense Earthquake Sequences](https://www.seismosoc.org/presentations/mlp-networks-to-associate-arrival-times-in-noisy-and-dense-earthquake-sequences/) - The concept of picking earthquake phase arrivals and associating them to a common event is simple, but hard to implement in a robust and reliable manner when there are multiple overlapping events and false arrival time picks. Related issues include determining precisely if and when an event has occurred when noisy and false arrivals are
- [An Empirical Model for Fourier Amplitude Spectra Using the NGA-West2 Database](https://www.seismosoc.org/presentations/an-empirical-model-for-fourier-amplitude-spectra-using-the-nga-west2-database/) - We develop an empirical ground-motion model (GMM) for Fourier amplitude spectra (FAS) using the PEER NGA-W2 database of ground motions from crustal earthquakes (Ancheta et al., 2014). GMMs have traditionally been developed for 5%-damped response spectra (PSA), however, there are some available models for FAS (e.g. Bora et al., 2015; Stafford et al., 2006; Yenier
- [First Experience with Seiscomp3 Based Tsunami Software for the Central American Tsunami Advisory Center (CATAC) at INETER, Nicaragua](https://www.seismosoc.org/presentations/first-experience-with-seiscomp3-based-tsunami-software-for-the-central-american-tsunami-advisory-center-catac-at-ineter-nicaragua/) - In January of 2018, we finished to install new hardware and software at the Central American Tsunami Advisory Center (CATAC), established at INETER in Nicaragua. CATAC is the most recent tsunami warning center integrating modules for earthquake detection, moment tensor analysis, tsunami simulation, decision support and warning dissemination based on the SeisComP3 framework. SeisComP3 is
- [Monitoring and Early Warning Center for Earthquakes and Tsunamis at INETER, Nicaragua – 2018](https://www.seismosoc.org/presentations/monitoring-and-early-warning-center-for-earthquakes-and-tsunamis-at-ineter-nicaragua-2018/) - In the last years, the Monitoring and Early Warning Center for Earthquakes and Tsunamis at INETER, Nicaragua, has developed rapidly due to new responsibilities INETER acquired at national and international level. In 2015, it became home of the Central American Tsunami Advisory Center CATAC). In 2016, INETER started a cooperation with the Swiss Seismological Service
- [Geomechanical Insights from Numerical Modeling of Intact Rock Failure:  Event Characteristics and Stress Drops](https://www.seismosoc.org/presentations/geomechanical-insights-from-numerical-modeling-of-intact-rock-failure-event-characteristics-and-stress-drops/) - A common assumption in the analysis of seismological data is that stresses are essentially homogeneous within an area or layer. This would imply for instance that only shear failure is possible in triaxial deformation tests when large differential stresses are imposed on the sample walls. Laboratory experiments however often find that acoustic emissions are characterized
- [Rupture Lengths of Intraplate Earthquakes in Brazil Determined by Relative Location of Aftershocks:  Evidence for Depth Dependence of Stress Drops](https://www.seismosoc.org/presentations/rupture-lengths-of-intraplate-earthquakes-in-brazil-determined-by-relative-location-of-aftershocks-evidence-for-depth-dependence-of-stress-drops/) - Whether intraplate and interplate earthquakes have different average source properties has been long debated. It has been proposed that intraplate events tend to rupture smaller areas with higher stress drops. We estimate rupture lengths of several Brazilian earthquakes by accurately locating their immediate aftershocks. The sparsity of stations in low-seismicity regions, such as Brazil, hinders
- [Toward a Temporal Evolution of the Earthquake Energy Budget: Body-Wave Radiated Energy Rate](https://www.seismosoc.org/presentations/toward-a-temporal-evolution-of-the-earthquake-energy-budget-body-wave-radiated-energy-rate/) - Assuming that the Green’s function between the source and the receiver is properly removed, the only direct measurement we can make of the earthquake energy budget is radiated energy. Dynamic source processes, such as fault roughness or heterogeneity in frictional and pre-stress properties, induce local variations in rupture velocity and peak slip rate and excite
- [Tracking Scattered Signals in the Acoustic Coda Using Independent Component Analysis in a Topographically Complex Setting](https://www.seismosoc.org/presentations/tracking-scattered-signals-in-the-acoustic-coda-using-independent-component-analysis-in-a-topographically-complex-setting/) - Like earthquakes, acoustic signals can consist of a “direct arrival” followed by a coda of scattered waves. In the acoustic case, the coda is generated from wave interactions with topography. The shape of the coda carries information about both the scatterer geometry and the atmospheric state between secondary sources and the receiver. This may permit
- [Search for Generic Rupture Properties Hidden by Earthquakes Diversity : Insights from the SCARDEC Source Time Functions Catalog](https://www.seismosoc.org/presentations/search-for-generic-rupture-properties-hidden-by-earthquakes-diversity-insights-from-the-scardec-source-time-functions-catalog/) - The search for key elements characterizing the earthquake rupture process is challenged by the specificities of each individual event. This results in a large diversity when looking at earthquakes as a whole. This diversity is well documented by the moment rate functions (or Source Time Functions - STF), one of the most robust seismological observables
- [The Collaboratory for the Study of Earthquake Predictability: Achievements and Priorities](https://www.seismosoc.org/presentations/the-collaboratory-for-the-study-of-earthquake-predictability-achievements-and-priorities/) - The Collaboratory for the Study of Earthquake Predictability (CSEP) is global platform for conducting prospective earthquake forecasting and prediction experiments. Since its inception in 2006 in California, CSEP has grown to encompass four testing centers around the world, and is now prospectively evaluating over four hundred models in testing regions in California, Italy, New Zealand,
- [Characteristics of Recent Aftershock Sequences of Moderate Earthquakes in Japan](https://www.seismosoc.org/presentations/characteristics-of-recent-aftershock-sequences-of-moderate-earthquakes-in-japan/) - Spatial and temporal distributions of aftershocks were studied for recent moderate earthquakes that occurred at shallow depth onshore of Japan and were well recorded by the regional networks. These events include the 2000 Western Tottori (Mw 6.7), 2004 Niigata Chuetsu (Mw 6.6), 2005 Fukuoka (Mw 6.6), 2007 Noto Peninsula (Mw 6.7), 2007 Niigata Chuetsu-oki (Mw
- [Remote Explosive Volcanic Eruption Detection, Location, and Characterization Using the Earthscope Transportable Array in Alaska](https://www.seismosoc.org/presentations/remote-explosive-volcanic-eruption-detection-location-and-characterization-using-the-earthscope-transportable-array-in-alaska/) - The current deployment of the EarthScope Transportable Array (TA) in Alaska affords an unprecedented opportunity to study explosive volcanic eruptions using a relatively dense regional seismo-acoustic network. Active volcanism in the Aleutian Arc poses a risk to both regional and international air traffic. Infrasound monitoring has demonstrated utility for the detection and characterization of explosive
- [Inversion for Focal Mechanisms Using Waveform Envelopes and Inaccurate Velocity Models](https://www.seismosoc.org/presentations/inversion-for-focal-mechanisms-using-waveform-envelopes-and-inaccurate-velocity-models/) - The major challenge for the moment tensor determination is associated to relatively low magnitude events (Mw~4) recorded by few (e.g. 4) regional stations at relatively large distances (300-600 km) and analyzed with standard velocity models of the region. Difficulties arise from the fact that synthetics in standard models, e.g. those routinely used in location, cannot
- [Assessment of the Impact of Hurricanes Irma and Maria on the Monitoring Capability of the Pacific Tsunami Warning Center for the Caribbean Region.](https://www.seismosoc.org/presentations/assessment-of-the-impact-of-hurricanes-irma-and-maria-on-the-monitoring-capability-of-the-pacific-tsunami-warning-center-for-the-caribbean-region/) - In September of 2017, hurricanes Irma and Maria wrecked havoc across the Eastern Caribbean region. While obliterating most of the infrastructure in the Caribbean nations found along their path, leaving a trail of suffering and despair in their wake, both hurricanes gradually destroyed the existing seismic networks. We assess the impact of both hurricanes on
- [Seismic Monitoring of the Trans-Alaska Pipeline](https://www.seismosoc.org/presentations/seismic-monitoring-of-the-trans-alaska-pipeline/) - In addition to being the authoritative regional seismic network for the state of Alaska, the Alaska Earthquake Center partners with other public and private stakeholders for customized event notifications and infrastructure monitoring. One such partnership is with Alyeska Pipeline Services Company, who operate the Trans Alaska Pipeline System - one of the world’s largest pipeline
- [Three-Dimensional Directivity Analysis for Resolving Source Parameters and Rupture Complexities](https://www.seismosoc.org/presentations/three-dimensional-directivity-analysis-for-resolving-source-parameters-and-rupture-complexities/) - Rupture properties, such as rupture direction, length, propagation speed and source duration, provide important insights into earthquake mechanisms. One approach to estimate these properties is to investigate the rupture directivity effect using the body-wave duration measurements. We demonstrate that the directivity effect should be treated as a three-dimensional problem, rather than assuming a horizontal or
- [Directly Estimating Earthquake Rupture Area Using Second Moments to Reduce the Uncertainty in Stress Drop](https://www.seismosoc.org/presentations/directly-estimating-earthquake-rupture-area-using-second-moments-to-reduce-the-uncertainty-in-stress-drop/) - The key kinematic source parameters: rupture velocity, duration and area, shed light on earthquake dynamics, provide direct constraints on stress-drop, and have implications for seismic hazard. However, for moderate and small earthquakes, these parameters are usually poorly constrained. Numerical experiments by Kaneko and Shearer [2014,2015] demonstrated that standard spectral fitting techniques can lead to roughly
- [The Brazilian Seismographic Network:  Present Status and Society Related Applications](https://www.seismosoc.org/presentations/the-brazilian-seismographic-network-present-status-and-society-related-applications/) - The Brazilian Seismographic Network (RSBR) was deployed between 2009 and 2015 mainly with resources from PETROBRAS and is currently maintained by the Brazilian Geological Survey (CPRM). Four FDSN sub-networks (BL, BR, NB, ON) compose RSBR, with a total of 84 permanent stations. Data from RSBR are open-access and transmitted over satellite, 3G modems or WISP
- [The National Seismological Network of Costa Rica (Rsn): An Overview and Recent Developments](https://www.seismosoc.org/presentations/the-national-seismological-network-of-costa-rica-rsn-an-overview-and-recent-developments/) - The National Seismological Network of Costa Rica (RSN) is a joint effort between the University of Costa Rica (UCR) and the Costa Rican Institute of Electricity (ICE). In this paper, we briefly describe its history, contributions, and seismic catalogue. We also address recent developments, such as: the expansion of the station network, the improvement on
- [Puerto Rico Seismic Network Operations, Damages, and Recovery from a Natech Disaster](https://www.seismosoc.org/presentations/puerto-rico-seismic-network-operations-damages-and-recovery-from-a-natech-disaster/) - In 2017, Hurricanes Irma and Maria struck the Northeast Caribbean in the span of less than 2 weeks. These storms had a profound impact on the seismic and tsunami monitoring in the region. Here we will the discuss the impact of these storms on operations and equipment from the perspective of the Puerto Rico Seismic
- [Virtual Seismic Networks – Case Studies in Europe and the Arabian Peninsula](https://www.seismosoc.org/presentations/virtual-seismic-networks-case-studies-in-europe-and-the-arabian-peninsula/) - In November 2001, four institutes in three countries (Austria, Italy and Slovenia) signed an agreement to exchange real-time seismic data in the Alpine-Adria region. The following year Earth Science Department of the university in Trieste (DST), the Italian National Institute of Oceanography and Applied Geophysics (OGS), the Office for Seismology of the Environmental Agency of
- [Local and Regional Earthquake Solutions from Joining Raspberry Shake and International Seismological Stations](https://www.seismosoc.org/presentations/local-and-regional-earthquake-solutions-from-joining-raspberry-shake-and-international-seismological-stations/) - Upon several local and regional earthquake events recorded around the world, we present results about joining some international stations with the new private seismological network of Raspberry Shakes. The earthquake locations are compared using parameters including latitude, longitude and depth error, as well as rms and gap. For doing this, we consulted international catalogues and
- [Complex Source Spectra in Small Earthquakes Caused by Multiple Asperities](https://www.seismosoc.org/presentations/complex-source-spectra-in-small-earthquakes-caused-by-multiple-asperities/) - In order to characterize earthquake rupture features, it is a fundamental task to explore earthquake parameters such as the seismic moment, the rupture dimension and the static stress drop. Spectral analysis is one widely used method to investigate these source parameters. Therefore, as the basis of the spectral analysis, a physically plausible and observationally consistent
- [Odd Moment Tensor](https://www.seismosoc.org/presentations/odd-moment-tensor/) - The interesting question “Why do nominal compressional (P-wave) seismic energy sources generate so much shear (S-wave) energy?” arises in both explosion and exploration seismology. The relative amount of P vs S energy is an important, but not definitive, discriminant between explosive (chemical or nuclear) and earthquake (shear and/or tensile dislocation) seismic sources. A long-established (and
- [The University of Utah Seismograph Stations: Mission and Operations](https://www.seismosoc.org/presentations/the-university-of-utah-seismograph-stations-mission-and-operations/) - The mission of the University of Utah Seismograph Stations (UUSS) is “Reducing the risk from earthquakes in Utah through research, education, and public service.” UUSS performs this role by being one of three core State of Utah agencies that contribute to the Utah Earthquake Program, an active partner within the Advanced National Seismic System (ANSS),
- [Geophysical Networks in Peru: A National Effort for Earthquake Disaster Management](https://www.seismosoc.org/presentations/geophysical-networks-in-peru-a-national-effort-for-earthquake-disaster-management/) - Since historical times the Peruvian subduction zone has been source of several damaging earthquakes, e.g. Lima 1940 (Mw 8.0), Nazca 1942 (Mw 8.0), Lima 1966 (Mw 8.0), Lima 1974 (Mw 8.0), Arequipa 2001 (Mw 8.4) and more recently, Pisco 2007 (Mw 7.9). Noteworthy are the Lima 1746 (Mw 8.6) and the Chimbote 1970 (mw 8.0)
- [Low-Cost Seismic Data Acquisition Module Based on Open-Source Hardware and Software Tools](https://www.seismosoc.org/presentations/low-cost-seismic-data-acquisition-module-based-on-open-source-hardware-and-software-tools/) - The Seismic Research Centre of the University of the West Indies, Trinidad and Tobago, operates a network of about 70 seismic stations in the eastern Caribbean islands from St. Kitts to Trinidad. Since 2008 the Centre has embarked on an initiative to expand and modernize this network by furnishing the stations with various combinations of
- [Meeting Alaska's Earthquake Needs in 2018](https://www.seismosoc.org/presentations/meeting-alaskas-earthquake-needs-in-2018/) - The Alaska Earthquake Center’s mission is to advance the state’s earthquake resilience by integrating monitoring, research, and public engagement. Previously, the Center approached this mission primarily by operating a network of seismic sensors and reporting on earthquake activity via traditional avenues such as catalog production and email alerts to emergency managers and journalists. This is
- [Keeping Up Appearances in the Pacific Northwest Seismic Network (PNSN)](https://www.seismosoc.org/presentations/keeping-up-appearances-in-the-pacific-northwest-seismic-network-pnsn/) - Regional seismic networks (RSNs) in areas like Cascadia, with high seismic hazard but where earthquakes are not often felt, face special challenges maintaining the enthusiasm and involvement of stakeholders over time. Negative consequences of stakeholder disinterest include a society poorly prepared to face the very real hazard, and lack of stakeholder support to maintain regional
- [The Eigenvalue Lune as a Window on Moment Tensors](https://www.seismosoc.org/presentations/the-eigenvalue-lune-as-a-window-on-moment-tensors/) - A moment tensor is a symmetric matrix that expresses the source for a seismic event. The fundamental lune of eigenvalues is a certain subset of the unit sphere whose points represent the source types for all moment tensors. Familiar source types such as double couple or pure isotropic have natural locations on the lune. Although
- [Stress Processes and Their Relation to the Tectonic Environment](https://www.seismosoc.org/presentations/stress-processes-and-their-relation-to-the-tectonic-environment/) - We have compiled a thorough database of earthquake source parameters for seismic events occurring in Mexico, obtained by means of two different methods: finite-fault slip inversions and spectral analysis. From this compilation we employed stress drop and apparent stress values calculated for three (subduction, strike-slip, and deep intra-plate) tectonic environments and compared the results of
- [Keeping Tabs on Oklahoma Seismicity: The Oklahoma Geological Survey Regional Network](https://www.seismosoc.org/presentations/keeping-tabs-on-oklahoma-seismicity-the-oklahoma-geological-survey-regional-network/) - The Oklahoma Geological Survey (OGS) monitors seismicity throughout the state of Oklahoma utilizing permanent and temporary seismometers installed by OGS and other agencies, while maintaining an earthquake catalog. In Oklahoma, prior to 2009 background seismicity rates were about 2 M3.0+ earthquakes per year, which increased to 579 and 903 M3.0+ earthquakes in 2014 and 2015,
- [Earthquake Early Warning Using Late-Onset P-Waves from Growing Ruptures](https://www.seismosoc.org/presentations/earthquake-early-warning-using-late-onset-p-waves-from-growing-ruptures/) - Robust ground motion prediction for large earthquakes with complex rupture behavior is a challenging task for earthquake early warning (EEW). During the 2011 Mw 9.0 Tohoku-oki earthquake, high-frequency wave packets that caused severe shaking were separately observed in time, indicating that several strong motion generation areas (SMGAs) ruptured with different delays. Such strong motions would
- [The Contribution of Scattering to Near-Surface Attenuation](https://www.seismosoc.org/presentations/the-contribution-of-scattering-to-near-surface-attenuation/) - The κ parameter (Anderson and Hough, 1984), and namely its path-corrected component (κ0), is important for predicting and simulating high‐frequency ground motion. Nowadays, κ0 is believed to be a local site characteristic, in turn representing attenuation related to waves propagating vertically through the very shallow layers beneath the study site. Despite the known relevance of
- [2018 One-Year Forecast for Induced and Natural Earthquakes in the Central and Eastern United States](https://www.seismosoc.org/presentations/2018-one-year-forecast-for-induced-and-natural-earthquakes-in-the-central-and-eastern-united-states/) - The USGS 2018 one-year probabilistic forecast for the central and eastern United States from induced and natural earthquakes is developed for consistency using the same probabilistic seismicity-based methodology as applied in the two previous forecasts. Rates of earthquakes M 3.0 and greater grew rapidly between 2008 and 2015 but have steadily declined over the past
- [Parameterizations, Uncertainties, and Spatial Scales of Seismic Attenuation](https://www.seismosoc.org/presentations/parameterizations-uncertainties-and-spatial-scales-of-seismic-attenuation/) - Current descriptions of seismic attenuation in Earth’s media almost invariably rely on the quality (Q) factor and its derivative quantities such as t*, phase lag f, and spectral parameter k. Q-based models are used at all scales and even in complex cases such as rock samples in the laboratory, finely-layered and scattering media, full-waveform inversions,
- [Mermaid, Mug-Obs, Manta-Obs, Hydr-Obs; New Versatile Multidisciplinary Instruments for Monitoring Seismology in Deep Ocean.](https://www.seismosoc.org/presentations/mermaid-mug-obs-manta-obs-hydr-obs-new-versatile-multidisciplinary-instruments-for-monitoring-seismology-in-deep-ocean/) - Real time acquisition data for oceanographer is the next great challenge for the future. There are several attempts to monitor real time seismic activity, using regional scale wired nodes, such as Neptune, Antares or DONET. These initiatives are costly to install and to maintain. Among the most recent alternative we developed a 3-years autonomy OBS
- [Seismic Amplifications in the Valley of Mexico Using Spectral Ratios of Teleseismic Surface Waves Recorded with Broadband Stations](https://www.seismosoc.org/presentations/seismic-amplifications-in-the-valley-of-mexico-using-spectral-ratios-of-teleseismic-surface-waves-recorded-with-broadband-stations/) - We have performed H/V ratios of Rayleigh waves for teleseismic events for stations located in four quadrants (along the back azimuth). The data comes from a network of 30 broadband seismometers of 19 earthquakes recorded from 2011 to 2013 with epicentral distances from 1,800 to 17,000 km and Mw from 7 to 9. The seismic
- [Red Geodésica del Noroeste de México (REGNOM) in Northern Baja California](https://www.seismosoc.org/presentations/red-geodesica-del-noroeste-de-mexico-regnom-in-northern-baja-california/) - Permanent continuous GPS stations in Baja California started to operate since 1995 as part of the Southern California Integrated GPS Network (SCIGN). Due to the occurrence of the El Mayor-Cucapah Mw7.2 earthquake in April 4, 2010, colleagues from Mexico and US started to work together in a NSF rapid response proposal to install 8 new
- [A Fortuitous Experiment on the Effect of Station Installation Parameters on Measures of Apparent Attenuation](https://www.seismosoc.org/presentations/a-fortuitous-experiment-on-the-effect-of-station-installation-parameters-on-measures-of-apparent-attenuation/) - In late August 2017 four broadband posthole seismometers where installed near the SPMN legacy TA station for two weeks in order to compare different installation configurations to each other and to the permanent vault installation. During that time, the five instruments recorded the M 6.3 event identified as a thermo-nuclear detonation in North Korea. The
- [Selection and Weighing of Ground Motion Models for Subduction Source Zones in Chile](https://www.seismosoc.org/presentations/selection-and-weighing-of-ground-motion-models-for-subduction-source-zones-in-chile/) - While the methodologies for probabilistic and deterministic seismic hazard analyses are now well established, the selection and weighting of ground motion models (GMM) that capture the epistemic uncertainty is often still treated arbitrarily. The wide availability of high-quality strong motion databases from Chile, however, offers the opportunity to quantify the GMMs that better represent the
- [Tsunami Data Assimilation for Rapid Forecast: Application to Cascadia and New Zealand](https://www.seismosoc.org/presentations/tsunami-data-assimilation-for-rapid-forecast-application-to-cascadia-and-new-zealand/) - We use a data assimilation method for a retrospective simulation of tsunami forecast using observed ocean bottom seismic (seafloor pressure) array data from offshore New Zealand and Cascadia. In the data assimilation method tsunami observations from a dense array are continuously assimilated to update the wavefield at each time step to forecast the coastal tsunami
- [COCONet Mirror Data Center at INETER, Nicaragua, and Early Warning in Central America](https://www.seismosoc.org/presentations/coconet-mirror-data-center-at-ineter-nicaragua-and-early-warning-in-central-america/) - The Nicaraguan Institute for Terrestrial Studies (Instituto Nicaraguense de Estudios Territoriales, INETER) received a grant to develop a mirror data center to host and serve COCONet data and metadata from UNAVCO and serve as a geodetic seamless archive center through web services (GSAC-WS). INETER, headquartered in Managua, Nicaragua is serving the western circum-Caribbean region. INETER
- [Reliability of the W-Phase Inversion for Earthquakes with MW > 6.0 to Be Used by the Central American Tsunami Advisory Center (CATAC)](https://www.seismosoc.org/presentations/reliability-of-the-w-phase-inversion-for-earthquakes-with-mw-6-0-to-be-used-by-the-central-american-tsunami-advisory-center-catac/) - This study was done in the framework of the project on the Reinforcement of the Central American Tsunami Advisory Center (CATAC) to be established at INETER in Managua, Nicaragua. To emit reliable and sufficiently fast tsunami services for local tsunamis it is necessary to determine, in near real time, the appropriate fault model needed for
- [Imaging Seismic Attenuation at the Brady Geothermal Field Using Interferometry](https://www.seismosoc.org/presentations/imaging-seismic-attenuation-at-the-brady-geothermal-field-using-interferometry/) - The Poroelastic Tomography experiment (PoroTomo) was conducted in March 2016 at Brady Hot Springs in Nevada. A key goal of the experiment is to understand how fluids travel from shallow aquifers, through faults and fractures, to deep geothermal reservoirs. As part of the effort, seismic, geodetic, and hydraulic technologies were tested and developed to fully
- [Regional EEW Applications in Marmara Region (NW Turkey) for Distant Large Earthquakes](https://www.seismosoc.org/presentations/regional-eew-applications-in-marmara-region-nw-turkey-for-distant-large-earthquakes/) - KOERI (Kandilli Observatory and Earthquake Research Institute) operates a seismic network in Marmara Sea region (NW Turkey) consisting of broadband and strong motion stations which has a reliable topology for regional EEW studies. In addition, a seismic network of 10 strong motion stations located close to the North Anatolian Fault crossing the Sea of Marmara
- [The Lamont-Doherty Cooperative Seismographic Network (LCSN) Service to Education and Community](https://www.seismosoc.org/presentations/the-lamont-doherty-cooperative-seismographic-network-lcsn-service-to-education-and-community/) - Lamont-Doherty Cooperative Seismographic Network (LCSN) contributes to outreach in ways that are unique to its structure. It is unusual in using a variety of station keepers (college & university faculty, secondary school teachers, museums, nature conservancies etc.) to engage a wide variety of audiences and to reach out to large numbers of the general public.
- [The Berkeley Digital Seismic Network](https://www.seismosoc.org/presentations/the-berkeley-digital-seismic-network/) - Since it began monitoring earthquakes in northern California almost 130 years ago, the University of California Berkeley Seismological Laboratory (BSL) has been striving to produce the highest quality and most complete seismic data possible in the most modern way. This goal continues to influence choices and investments in instrumentation, installation, telemetry, expertise and manpower. The
- [Seismic Microzonation and Amplification Factor Determination in the North- Northeast Area of Managua City, Nicaragua](https://www.seismosoc.org/presentations/seismic-microzonation-and-amplification-factor-determination-in-the-north-northeast-area-of-managua-city-nicaragua/) - Two key factors influence the ground motion level an earthquake can cause at a given site. Firstly, are the inherent characteristics of the earthquake such as magnitude and rupture mechanism besides the location parameters such as distance to the source and depth. Secondly, soil dynamic properties such as fundamental periods and shear wave velocity. From
- [One Year of Texas Seismological Network Seismic Data](https://www.seismosoc.org/presentations/one-year-of-texas-seismological-network-seismic-data/) - In an effort to better understand the seismogenesis of earthquake events and to monitor earthquake activity, a statewide seismic monitoring program, known as TexNet ( http://www.beg.utexas.edu/texnet ), has been funded by the 84th Texas Legislature to deploy seismic stations in Texas. The goal of TexNet is to provide authenticated data to evaluate the location, frequency,
- [Recent Seismic Microzonation Study for the Aburra Valley, Colombia](https://www.seismosoc.org/presentations/recent-seismic-microzonation-study-for-the-aburra-valley-colombia/) - The city of Medellin and its metropolitan area (about 3 million inhabitants) are located in the Aburra valley in Colombia, which is an active seismic region. Colombian seismic design code (NSR-10) dictates that every city with a population over 100,000 inhabitants must have a seismic microzonation study. These studies aims to evaluate the amplification effects
- [Real-Time Correction of Frequency-Dependent Site Amplification Factors in Time Domain: Introduction of Phase Delay for Real-Time Prediction of Duration of Ground Motion](https://www.seismosoc.org/presentations/real-time-correction-of-frequency-dependent-site-amplification-factors-in-time-domain-introduction-of-phase-delay-for-real-time-prediction-of-duration-of-ground-motion/) - We propose a method for real-time prediction of duration of strong ground motion for earthquake early warning (EEW). Because the long duration of shaking is often observed on basin structure, prediction of duration is important in EEW in addition to the strength of shaking. Although many of EEW system focus on rapid determination of source
- [The Trinidad and Tobago Microzonation Project: Understanding and Quantifying Earthquake Hazard](https://www.seismosoc.org/presentations/the-trinidad-and-tobago-microzonation-project-understanding-and-quantifying-earthquake-hazard/) - In the past 30 years, there has been widespread attention to the impact of local geology, in urban areas, on ground motion during earthquakes. Numerous studies (e.g. Bard, 1999 and Haghshenas et al., 2008 for a literature review) have shown that the seismic amplification observed in sediments can vary significantly, even at small distances, as
- [Upper Stratosphere Wind Variations and Their Effect on Regional Infrasound Propagation](https://www.seismosoc.org/presentations/upper-stratosphere-wind-variations-and-their-effect-on-regional-infrasound-propagation/) - Infrasound is a valuable technique for monitoring phenomena such as surface explosions and volcanic eruptions from hundreds of kilometers away. However, uncertainties in the wind and temperature structure of the upper stratosphere (35-45 km) result in predicted wave propagation patterns that often deviate from reality. We discuss two infrasound measurement campaigns that used chemical explosions
- [Non-Linear and Plastic Soil Response in the Greater Tokyo Area during the 2011 Tohoku-Oki Earthquake](https://www.seismosoc.org/presentations/non-linear-and-plastic-soil-response-in-the-greater-tokyo-area-during-the-2011-tohoku-oki-earthquake/) - Strong ground motion from earthquakes can induce dynamic strains large enough for the shallow subsurface to respond non-linearly and cause permanent velocity changes. We investigate the behavior of the near-surface in the greater Tokyo area during the 2011 Mw 9.0 Tohoku-Oki earthquake sequence using continuous records from 234 seismometers of the Metropolitan Seismic Observation network
- [Imaging Medium Changes at Depth Using 3-D Probabilistic Body- and Surface-Wave Sensitivity Kernels](https://www.seismosoc.org/presentations/imaging-medium-changes-at-depth-using-3-d-probabilistic-body-and-surface-wave-sensitivity-kernels/) - In the context of seismic monitoring, recent studies made successful use of seismic coda waves to detect and medium changes and locate them on the horizontal plane. Locating the depth of the changes, however, remains a challenge. We build 3D sensitivity kernels as a linear combination of body- and surface-wave sensitivity and show their potential
- [Expanding the U.S. Geological Survey’s Efforts to Effectively Communicate Operational Earthquake Forecasts](https://www.seismosoc.org/presentations/expanding-the-u-s-geological-surveys-efforts-to-effectively-communicate-operational-earthquake-forecasts/) - For over a decade, the U.S. Geological Survey (USGS) has been communicating operational earthquake forecasts to various public audiences. During that time, these forecasts have been communicated using myriad of channels and formats, including text, maps, graphics, and tables. Each new forecast was presented differently using a variety of channels and at varying times during
- [Estimating Seismic Source Time Functions in Stochastic Earth Models](https://www.seismosoc.org/presentations/estimating-seismic-source-time-functions-in-stochastic-earth-models/) - This work describes three current research efforts in estimating the mechanisms of explosive seismic sources using simulations and actual field data. In all of the work here, we use linear inverse methods to invert the seismic data for an equivalent linear source type. However, in the case that seismic energy is created by an explosion,
- [Robustness of κ0 Measurement: Insight from a Site-Specific Study in the Low-to-Moderate Seismicity Context of Southeastern France](https://www.seismosoc.org/presentations/robustness-of-κ0-measurement-insight-from-a-site-specific-study-in-the-low-to-moderate-seismicity-context-of-southeastern-france/) - The site component of κ (κ0) is used in engineering seismology to describe the high-frequency attenuation at a site. It is an important input parameter for various applications (stochastic modeling, ground-motion prediction equations, host-to-target adjustments, etc.). Its evaluation faces, however, several issues as it is difficult to properly isolate κ0 from the source and path
- [Towards Structural Imaging Using Scattering Artifacts Detected in Ambient Field Correlations](https://www.seismosoc.org/presentations/towards-structural-imaging-using-scattering-artifacts-detected-in-ambient-field-correlations/) - Correlations of the ambient seismic field have been used successfully for tomographic imaging of the Earth on a wide range of scales. This is based on the theoretical and experimental observations that correlation functions computed between the signals recorded by two stations contain an approximation of the impulse response (Green’s function) between these stations. The
- [Operational Experience with Next-Generation Automatic Association Software NET-VISA](https://www.seismosoc.org/presentations/operational-experience-with-next-generation-automatic-association-software-net-visa/) - The NET-VISA software produces an automatic combined seismic, hydroacoustic and infrasound bulletin resulting from the key step of assembling detections from multiple stations within the processing chain of the International Data Centre (IDC) of the Comprehensive Nuclear-Test-Ban Treaty (CTBTO). The IDC waveform analysts are systematically evaluating the results of using it as a complement to
- [Recent Findings and Recommendations for an Updated Hazard Characterization of the Eglington Fault in Las Vegas Valley, Nevada](https://www.seismosoc.org/presentations/recent-findings-and-recommendations-for-an-updated-hazard-characterization-of-the-eglington-fault-in-las-vegas-valley-nevada/) - The Las Vegas Valley fault system (LVVFS) is a complex set of north- to northeast- trending, intra-basin Quaternary fault scarps up to 30 m high that displace alluvial fan, fine-grained basin fill, and paleo-spring deposits in the densely populated Las Vegas metropolitan area. Characterizing the seismic hazard of the LVVFS is currently the focus of
- [Dynamic Models of Earthquake Rupture along Branch Faults of the Eastern San Gorgonio Pass Region in California Using Complex Fault Structure](https://www.seismosoc.org/presentations/dynamic-models-of-earthquake-rupture-along-branch-faults-of-the-eastern-san-gorgonio-pass-region-in-california-using-complex-fault-structure/) - Compilations of geologic data have illustrated that the right-lateral Coachella segment of the southern San Andreas Fault is past its average recurrence time period. On its western edge, this fault segment is split into two branches: the Mission Creek strand, and the Banning fault strand, of the San Andreas fault. Depending on how rupture propagates
- [Reawakening of the Wharton Basin (Indian Ocean) Led to Unusual Ocean Plate Earthquakes during 2004-2016](https://www.seismosoc.org/presentations/reawakening-of-the-wharton-basin-indian-ocean-led-to-unusual-ocean-plate-earthquakes-during-2004-2016/) - The 2004 earthquake on the Sumatra trench was followed by a series of large events, along the plate boundary and within the subducting plate. Post-2004, the Wharton Basin was unusually active, notably the 2012, largest strike-slip earthquakes ever recorded. Here we discuss two types of earthquakes, those close to the trench (intraslab) and those, away
- [Machine Learning Applied to Probing Fault Physics](https://www.seismosoc.org/presentations/machine-learning-applied-to-probing-fault-physics/) - Machine learning has been applied to a number of problems in geoscience for decades. In general, applications used only portions of available data due in part to limited data and computing power. For instance, considerable work has been done using earthquake catalogs. Catalogs are assembled by hand or in some automated manner applying classical data
- [2018 Honduras Earthquake and Tsunamis:  Notification and Response Process](https://www.seismosoc.org/presentations/2018-honduras-earthquake-and-tsunamis-notification-and-response-process/) - On January 10, 2018 at 2h51 UTC (January 9 between 8:51 and 10:51 PM local time) a Mw 7.6 earthquake occurred offshore Swan Island (Honduras). Fortunately there was no significant damage from the earthquake and the tsunami was small. This was the first time the Pacific Tsunami Warning Center (PTWC) issued a Tsunami Threat for
- [Science Gateways for Enhancing Earthquake Science](https://www.seismosoc.org/presentations/science-gateways-for-enhancing-earthquake-science/) - Science gateways are Web interfaces and middleware that both simplify access to supercomputers and expand the capabilities of their users through graphical user interfaces. Since initially conceived two decades ago, science gateways have matured into production services used daily by many scientists. For example, science gateway users of XSEDE supercomputers consistently outnumber regular command line
- [Smart Cables - Sensing the Oceanographic and Geophysical Pulse of the Planet](https://www.seismosoc.org/presentations/smart-cables-sensing-the-oceanographic-and-geophysical-pulse-of-the-planet/) - An international task force is working to integrate environmental monitoring sensors into submarine telecommunication cables. The SMART Cables Initiative – for Science Monitoring And Reliable Communications – is sponsored by several UN agencies and led by the Joint Task Force. The SMART cables concept calls for adding sensor suites to the repeaters of future submarine
- [Intraslab Earthquake Faulting in Subduction Zones: The Role of Seafloor Fabric During the m7.1 and m8.2 September 2017 Mexico Earthquakes](https://www.seismosoc.org/presentations/intraslab-earthquake-faulting-in-subduction-zones-the-role-of-seafloor-fabric-during-the-m7-1-and-m8-2-september-2017-mexico-earthquakes/) - Two large normal faulting intraslab events occurred in rapid succession in Mexico in 2017, the 8th September M8.2 Tehuantepec, and 19th September M7.1 Puebla-Morelos earthquakes. Here we will discuss detailed source models of both earthquakes produced from inversion of all available regional geophysical data. This includes, strong motion, high-rate GPS, static GPS, tide gauge, and
- [Effective Amplitude Spectrum (EAS) as a Metric for Ground Motion Modeling Using Fourier Amplitudes](https://www.seismosoc.org/presentations/effective-amplitude-spectrum-eas-as-a-metric-for-ground-motion-modeling-using-fourier-amplitudes/) - Pseudo-spectral acceleration (PSA) is the most commonly used intensity measure in earthquake engineering, as it serves as a simple approximate predictor of structural response for many types of systems. Therefore, most ground motion models (GMMs, aka GMPEs) provide median and standard deviation PSA using a suite of input parameters characterizing the source, path and site
- [Tsunami Mitigation Mapping Effort in the Gulf of Mexico](https://www.seismosoc.org/presentations/tsunami-mitigation-mapping-effort-in-the-gulf-of-mexico/) - The devastating consequences of recent tsunami events in Indonesia (2004) and Japan (2011) have prompted a scientific response in assessing tsunami hazard even in regions where an apparent low risk or/and lack of complete historical tsunami record exists. Although a great uncertainty exists regarding the recurrence rate of large-scale tsunami events in the Gulf of
- [The 8 September 2017 Earthquake: An Example of Large Scale Lithospheric Faulting in the Subducted Cocos Plate](https://www.seismosoc.org/presentations/the-8-september-2017-earthquake-an-example-of-large-scale-lithospheric-faulting-in-the-subducted-cocos-plate/) - The 8 September 2017 earthquake took place in the Tehuantepec gap, in southeastern Mexico, where no large quakes have taken place since 1902. The 8 September earthquake, however, did not rupture the megathrust plate contact between the Cocos and the North American plates. The 2017 earthquake occurred within the subducting slab at a depth of
- [Exploring the Potential for Hosting a Geoscience Data Center in the Cloud](https://www.seismosoc.org/presentations/exploring-the-potential-for-hosting-a-geoscience-data-center-in-the-cloud/) - The IRIS Data Management Center (DMC) has operated a public repository of seismological data for 3 decades supporting thousands of researchers. Since its founding, the DMC has operated its own infrastructure to support the computational and storage resources needed to support its mission. In the GeoSciCloud project, supported by the National Science Foundation’s (NSF) EarthCube
- [Generalized Seismic Phase Detection with Deep Learning](https://www.seismosoc.org/presentations/generalized-seismic-phase-detection-with-deep-learning/) - In recent years, various techniques exploiting the waveform similarity of clustered earthquakes have been used to increase the detection sensitivity of earthquakes, typically by more than an order of magnitude. These approaches are powerful because they use exact copies of seismograms to match against, but for this same reason, are of limited utility in detecting
- [Inferences of Slab Tears throughout the Caribbean from Integrated Seismic Methods](https://www.seismosoc.org/presentations/inferences-of-slab-tears-throughout-the-caribbean-from-integrated-seismic-methods/) - We present new tomographic models in combination with recent shear wave splitting results to aid in understanding the tectonic history of the Caribbean. Our recent results for 201 SK(K)S shear wave splitting results at 20 stations in the northeastern Caribbean indicated a relatively simple trench-parallel pattern. These results agree with previous splitting measurements. This was
- [Crustal Structure beneath Seismic Stations Located in Paraná and Chaco-Paraná Basins from Joint Inversion of Surface Wave Dispersion and Receiver Functions](https://www.seismosoc.org/presentations/crustal-structure-beneath-seismic-stations-located-in-parana-and-chaco-parana-basins-from-joint-inversion-of-surface-wave-dispersion-and-receiver-functions/) - The seismic structure of the crust and uppermost mantle under the central and eastern region of South America is being a matter of study in recent years due to the installation of new temporary and permanent seismological stations. In this study the S-wave velocity structure beneath seismic stations located in Paraná and Chaco-Paraná Basins is
- [Comparison between Frequency and Time Domain Cross-Correlation of Seismic Noise Data in South Korea](https://www.seismosoc.org/presentations/comparison-between-frequency-and-time-domain-cross-correlation-of-seismic-noise-data-in-south-korea/) - Seismic noise records are commonly used to investigate the subsoil structure. In recent years, seismic noise cross-correlation techniques have been successfully used at global, continental, and regional scales. In this study, we analyze 12 month of continuous seismic noise (8760 hours) recorded by the permanent accelerograph network of the South Korean Republic to explore the
- [From the Seismic Cycle to Long-Term Deformation: Linking Seismic Coupling and Quaternary Coastal Geomorphology along the Andean Megathrust](https://www.seismosoc.org/presentations/from-the-seismic-cycle-to-long-term-deformation-linking-seismic-coupling-and-quaternary-coastal-geomorphology-along-the-andean-megathrust/) - Measurement of interseismic strain along subduction zones reveals the location of both locked asperities, which might rupture during megathrust earthquakes, and creeping zones, which tend to arrest such seismic ruptures. The heterogeneous pattern of interseismic coupling relates to spatial variations of frictional properties along the subduction interface and may also show up in the fore-arc
- [Address-Level Effects of the 1918 Puerto Rico Earthquake](https://www.seismosoc.org/presentations/address-level-effects-of-the-1918-puerto-rico-earthquake/) - The last major earthquake to affect Puerto Rico was a Mw 7.3 event that occurred in 1918, about 30 km northwest of the northwest corner of the island, on a normal fault associated with the Mona Canyon rift. It was accompanied by a destructive tsunami. The most severe damage was sustained in the towns of
- [An Improved Semi-Automatic Shallow Event Depth Estimation Algorithm, Based on Cepstral Analysis](https://www.seismosoc.org/presentations/an-improved-semi-automatic-shallow-event-depth-estimation-algorithm-based-on-cepstral-analysis/) - An important parameter considered for event characterization is depth. One method used for depth estimation is determining the difference in arrival times between the initial P phase and the following depth-phase arrival resulting from a P-phase surface reflection. For deeper events, the first arrival and its depth phase are well separated, and the time difference
- [Discrimination of the DPRK Announced Underground Explosions and Their Aftershocks Using the Pg/lg Spectral Amplitude Ratio](https://www.seismosoc.org/presentations/discrimination-of-the-dprk-announced-underground-explosions-and-their-aftershocks-using-the-pg-lg-spectral-amplitude-ratio/) - We estimate the discrimination criterion based on the P/S spectral amplitude ratios as applied to six tests conducted by North Korea and ten aftershocks induced by the last two explosions. We use data from IMS arrays USRK and KSRS and non-IMS 3-C stations SEHB (South Korea) and MDJ (China). The largest P and S phases
- [Investigating the Limits of Correlation Detectors as Discriminants](https://www.seismosoc.org/presentations/investigating-the-limits-of-correlation-detectors-as-discriminants/) - In much of the Central and Eastern United States (CEUS), the vast majority of observed seismic events are the result of surface mining activity. Monitoring and reporting these events creates an undue burden on seismic analysts when generating an earthquake bulletin and their removal from earthquake catalogs is necessary to support downstream products such as
- [Seismic Hazard Analysis in Jamaica Incorporating Quaternary Faults](https://www.seismosoc.org/presentations/seismic-hazard-analysis-in-jamaica-incorporating-quaternary-faults/) - The island of Jamaica is located in the interplate region between the Caribbean and North America plates and two major left-lateral strike-slip faults: the Septentrional-Oriente and the Enriquillo-Plantain Garden (EPG) fault zones. The majority of the 19 mm/yr relative plate motion is partitioned between these two fault systems. GPS modeling suggests that 7 to 9
- [Quaternary Faults in the Vicinity of Puerto Rico and the Virgin Islands and Their Seismic Hazard](https://www.seismosoc.org/presentations/quaternary-faults-in-the-vicinity-of-puerto-rico-and-the-virgin-islands-and-their-seismic-hazard/) - Multibeam bathymetry, high-resolution seismic reflection, ROV dives, historical earthquake analysis, GPS data, and stress models help guide the identification of Quaternary faults in the vicinity of Puerto Rico and the Virgin Islands (VI). Large historical earthquakes and tsunamis, although not well located on specific faults, nevertheless attest to seismic hazard from Mona and Anegada passages.
- [Single-Station Imaging of a Low-Velocity Layer Using Reflected Waves from the 2014 Earthquake Swarm at Long Valley Caldera, California](https://www.seismosoc.org/presentations/single-station-imaging-of-a-low-velocity-layer-using-reflected-waves-from-the-2014-earthquake-swarm-at-long-valley-caldera-california/) - The waveforms generated by the 2014 Long Valley Caldera earthquake swarm recorded at station MLH show clear reflected waves that are often stronger than direct P and S waves. The reflected waves first propagate downward from the source locations and then reflect back to the ground surface. With waveform analyses, we discover that these waves
- [Does the Integration of Two Different Datasets Affect Tomographic Images and Earthquake Location? The Case Study of the High Agri Valley (Southern Italy)](https://www.seismosoc.org/presentations/does-the-integration-of-two-different-datasets-affect-tomographic-images-and-earthquake-location-the-case-study-of-the-high-agri-valley-southern-italy/) - Local earthquake tomography is a useful tool for both imaging the subsurface elastic properties of an area and for locating earthquakes. The accuracy of the velocity model and source location depends on the resolution provided by the ray coverage, which, in turn, depends on the source-station configuration and on the number of travel time data.
- [What Can Earthquakes Tell Us of Plate Interactions in Northern South America?](https://www.seismosoc.org/presentations/what-can-earthquakes-tell-us-of-plate-interactions-in-northern-south-america/) - The northern edge of South America features the interaction of three major plates (and probably multiple minor ones). This complex setting includes the subduction of the Nazca plate, showing flat subduction in the north and strong variability of subducting angle to the south. The Caribbean plate is subducting to the north, also with potential flat
- [Seismic Imaging of the West Napa Fault in Napa, California](https://www.seismosoc.org/presentations/seismic-imaging-of-the-west-napa-fault-in-napa-california/) - In October 2016, we acquired high-resolution P- and S-wave seismic data along a 120-m-long, SW-NE-trending profile in Napa, California. Our seismic survey was designed to image a strand of the West Napa Fault Zone (WNFZ), which ruptured during the 24 August 2014 Mw 6.0 South Napa Earthquake. We separately acquired P- and S-wave data at
- [Modern Kinematics of the Cordillera Blanca Fault, Northern-Central Peru, from GPS Geodesy](https://www.seismosoc.org/presentations/modern-kinematics-of-the-cordillera-blanca-fault-northern-central-peru-from-gps-geodesy/) - The Cordillera Blanca batholith is an intrusive emplacement of Miocene age (5 Ma) that lies over the northern-central Peruvian Andes. Its western flank is bounded by a normal fault that extends for about 220 km in a NW-SE direction and dips west at a low angle. There is no historical evidence of large earthquakes associated
- [Active Plate Tectonics and Main Fault Systems in Colombia: An Updated Model for 3D Fault Geometries and Magnitudes](https://www.seismosoc.org/presentations/active-plate-tectonics-and-main-fault-systems-in-colombia-an-updated-model-for-3d-fault-geometries-and-magnitudes/) - Active plate tectonics in Colombia is dominated by the convergence of the oceanic Nazca and Caribbean plates along the northwestern margins of continental South American plate. As a consequence, two subduction zones and a complex fault system are present inside the northern Andean region. As the result of these interactions, large earthquakes occur in Colombia
- [Identification of Small Seismic Events around North Korean Nuclear Test Site following the 3 September 2017 Underground Nuclear Test](https://www.seismosoc.org/presentations/identification-of-small-seismic-events-around-north-korean-nuclear-test-site-following-the-3-september-2017-underground-nuclear-test/) - At least nine small seismic events were detected and located around the North Korean nuclear test site following the 3 September 2017 underground nuclear test. The magnitude of these shocks range from 2.3 to 3.5. Based on their proximity to the 3 September 2017 UNT, these shocks may be considered as aftershocks of the UNT.
- [Transportable Array Alaska - Power and Telemetry System Design and Performance](https://www.seismosoc.org/presentations/transportable-array-alaska-power-and-telemetry-system-design-and-performance/) - The Alaska Transportable Array (ATA) is a broadband seismic network made up of 280 new and existing stations that uniformly cover Alaska and north-west Canada. Over five field season from 2013-2017, 194 new stations were installed. In order to meet the performance requirements for the network, new power systems and telemetry systems were designed and
- [SCEC Tool for Distribution and Integration of Simulated Ground Motions within the NEHRI-CI Portal](https://www.seismosoc.org/presentations/scec-tool-for-distribution-and-integration-of-simulated-ground-motions-within-the-nehri-ci-portal/) - The Southern California Earthquake Center (SCEC) has been collaborating with the National Hazard Engineering Research Infrastructure (NHERI) to deliver simulated ground motions through a new web tool on the NHERI cyberinfrastructure portal, DesignSafe-CI. The NHERI DesignSafe-CI offers opportunities for engineering research for multiple natural hazards and integrates various engineering computational tools and data storage capabilities.
- [Uncertainty Estimation of Moment Tensor Source Types](https://www.seismosoc.org/presentations/uncertainty-estimation-of-moment-tensor-source-types/) - A moment tensor is a symmetric matrix that expresses the source for a seismic event. Uncertainty characterization of moment tensors is vital for any interpretation about the moment tensor, such as whether an event is likely to be an earthquake or not. We provide a method for characterizing and visualizing the uncertainty for a full
- [Rayleigh Wave Group-Velocity across the Dominican Republic and Puerto Rico from Ambient Noise Tomography](https://www.seismosoc.org/presentations/rayleigh-wave-group-velocity-across-the-dominican-republic-and-puerto-rico-from-ambient-noise-tomography/) - The eastern North America-Caribbean (NA-CAR) plate boundary near the islands of Hispaniola and Puerto Rico is a complex transition zone in which strain is accommodated by two transform fault systems and oblique subduction. In 2013, scientists from Baylor University, the Autonomous University of Santo Domingo, and the Puerto Rico Seismic Network deployed 16 broadband stations
- [Seismo-Geodetic Monitoring of the Marmara Seismic Gap](https://www.seismosoc.org/presentations/seismo-geodetic-monitoring-of-the-marmara-seismic-gap/) - The North Anatolian Fault Zone in the Sea of Marmara did not generate a M>7.0 earthquake since 1766. This fault section stores ~20 mm annual slip deficit and therefore is expected to accommodate at least one at most three M>7.0 in near future. In this study, we continuously monitor this critically strained fault section using
- [Geodetic Characterization of Kinematic Segmentation Along the Presqu'ile Du Sud / Enriquillo Fault System in Southern Haiti](https://www.seismosoc.org/presentations/geodetic-characterization-of-kinematic-segmentation-along-the-presquile-du-sud-enriquillo-fault-system-in-southern-haiti/) - The ~3 M inhabitant capital region of Haiti, severely affected by the devastating January 12, 2010, M7.0 earthquake, continues to expand at a fast rate. Accurate characterization of regional earthquake sources is key to inform urban development and construction practices through improved regional seismic hazard estimates. We recently showed, using Global Positioning System (GPS) measurements
- [Understanding Estimates of the Location, Size, and Frequency of Cascadia’s Megathrust Earthquakes](https://www.seismosoc.org/presentations/understanding-estimates-of-the-location-size-and-frequency-of-cascadias-megathrust-earthquakes/) - Interpretations of differing types of data, analyses, and modeling yield different rates of recurrence for Cascadia’s great (M8-9) megathrust earthquakes. Learning the source of these differences will improve seismic hazard assessments and forecasts. Understanding these differences will require asking fundamental questions about cycles of earthquake strain accumulation and release on various temporal and spatial scales,
- [Integration of Site Effects Into PSHA: A Comparison between Two Fully Probabilistic Methods for the Euroseistest Case](https://www.seismosoc.org/presentations/integration-of-site-effects-into-psha-a-comparison-between-two-fully-probabilistic-methods-for-the-euroseistest-case/) - The integration of site effects into Probabilistic Seismic Hazard Assessment (PSHA) is a constant subject of discussion within the seismic hazard community due to its high impact on hazard estimates. To include this effect in PSHA, different approaches have been proposed by different authors. The aim of this research is to compare the hazard curves
- [The Northern Caribbean Megathrust](https://www.seismosoc.org/presentations/the-northern-caribbean-megathrust/) - The highly-variable deformation mode along the NE Caribbean subduction/collision zone probably precludes simultaneous rupture of the entire subduction zone, but may still lead to intraplate earthquakes and tsunamis. Under the Lesser Antilles, where subduction of the North American plate is at high angle, island arc volcanism and large earthquakes occur. The convergence component decreases significantly
- [Drilling Through the Seismogenic Zone of Large Megathrust Earthquakes:  An On-Land Opportunity in Osa Peninsula, Costa Rica](https://www.seismosoc.org/presentations/drilling-through-the-seismogenic-zone-of-large-megathrust-earthquakes-an-on-land-opportunity-in-osa-peninsula-costa-rica/) - A great geographical-temporal opportunity exists in Osa peninsula, southern Costa Rica, to drill and instrument a locked segment of the Middle America Subduction Zone, where the plate interface beneath the peninsula is only 4 to 8 km deep. This section of the subduction zone has had large (Mw=7.2-7.4) earthquakes in 1853, 1904, 1941 and 1983.
- [Case of an Orphan Tsunami on the Konkan Coast, Western India: A Distant Megathrust or a Near-Field Source?](https://www.seismosoc.org/presentations/case-of-an-orphan-tsunami-on-the-konkan-coast-western-india-a-distant-megathrust-or-a-near-field-source/) - The last decade witnessed some unusually large tsunamis, and among these, the 2004 tsunami was an unprecedented experience for the coastal communities on the east coast of India. In comparison, the tsunami hazard for the west coast remains under-recognized. Our explorations led us to an intriguing near-beach ~20-m-thick sedimentary section of eolian sand at Kelshi,
- [Estimating Scaled Depth of Burial from Acoustic Period](https://www.seismosoc.org/presentations/estimating-scaled-depth-of-burial-from-acoustic-period/) - Buried explosions can produce an acoustic wave detectable at ranges of tens to hundreds of kilometers. Since they are a record of forces imposed across the solid Earth/atmosphere boundary, these waves may contain information about the explosive source. Indeed, analysis of infrasound data acquired during the Source Physics Experiment (SPE) Phase 1 series in granite
- [Is the Ancient Nortecubana Fold-and-Thrust Fault System Reactivated in Extension Today?](https://www.seismosoc.org/presentations/is-the-ancient-nortecubana-fold-and-thrust-fault-system-reactivated-in-extension-today/) - The North Cuban fold and thrust belt formed in response to Caribbean:North America plate collision that largely ended ~40 Ma. Today an arcuate band of seismicity extends 950+ km along the north shore of Cuba, signifying ongoing deformation along this ancient suture on a series of reverse faults collectively called the Nortecubana fault system. We
- [Megathrusts and Tsunamis in the Caribbean](https://www.seismosoc.org/presentations/megathrusts-and-tsunamis-in-the-caribbean/) - The Caribbean is host to significant subduction zones with faults and processes that have generated large historical earthquakes and tsunamis causing from dozens to several hundred thousand deaths. As we look ahead to planning for these events, especially the less frequent tsunami and considering the many competing hazards the Emergency Management Community have to prepare
- [Fault Creep and Strain Partitioning in Trinidad and Tobago: Geodetic Measurements, Models, and Origin of Creep](https://www.seismosoc.org/presentations/fault-creep-and-strain-partitioning-in-trinidad-and-tobago-geodetic-measurements-models-and-origin-of-creep/) - Plate boundaries generally exhibit complex strain partitioning across multiple faults. We studied active faults in Trinidad and Tobago in the Caribbean-South American (CA-SA) transform plate boundary zone using episodic GPS (eGPS) data from 19 sites and continuous GPS (cGPS) data from 8 sites, then modeled these data using a series of simple screw dislocation models.
- [Applications of Body-Wave Methods of Distinguishing Between Explosions, Cavity Collapses and Earthquakes to the Recent DPRK Events With Insights From the Nevada Source Physics Experiments](https://www.seismosoc.org/presentations/applications-of-body-wave-methods-of-distinguishing-between-explosions-cavity-collapses-and-earthquakes-to-the-recent-dprk-events-with-insights-from-the-nevada-source-physics-experiments/) - Examination of regional distance seismic data from historic nuclear test sites has led to a variety of very effective discriminants between explosions, earthquakes and collapses. These include moment tensor techniques and body-wave based methods. Here we focus on the body-wave methods. We show that P/S ratios above about ~2 Hz very effectively separate the six
- [Long-Term OBS Observations in the Sea of Marmara, Northwest Turkey](https://www.seismosoc.org/presentations/long-term-obs-observations-in-the-sea-of-marmara-northwest-turkey/) - Local extensional and contraction features corresponding to subsidence and uplift are determined around the North Anatolian fault zone (NAFZ), namely Main Marmara Fault (MMF), crossing the Sea of Marmara. Long term Ocean Bottom Seismograph (OBS) observation have been carried out through a joint Turkish-Japanese project called Mardim. Presently, three deployments and recovery of 15 OBS
- [Mutual Subduction: A Review of Observations from the Southern Caribbean Margin and Some Outstanding Questions](https://www.seismosoc.org/presentations/mutual-subduction-a-review-of-observations-from-the-southern-caribbean-margin-and-some-outstanding-questions/) - The most evident surface expression of the Caribbean-South America plate boundary is the strike-slip San Sebastian – El Pilar fault system. However, the boundary also comprises two convergent segments. In the east, the Atlantic (oceanic continuation of South America) subducts beneath the Caribbean, while in the west, the Caribbean subducts beneath South America. While Atlantic
- [Developing Local-Context Messages for Protective Actions during Earthquakes in Anse-a-Veau, Haiti](https://www.seismosoc.org/presentations/developing-local-context-messages-for-protective-actions-during-earthquakes-in-anse-a-veau-haiti/) - In the unnerving seconds when earthquake shaking begins, a person's action may spell the difference between safety and suffering. Various messages that describe protective actions have been issued in the United States, such as: Drop, Cover and Hold on, triangle of life, stand in a doorway. But these may not be the safest actions in
- [The Canadian Cordillera Array: Towards a Multi-Disciplinary Geoscience Program for Canada](https://www.seismosoc.org/presentations/the-canadian-cordillera-array-towards-a-multi-disciplinary-geoscience-program-for-canada/) - The Canadian Cordillera Array (CCArray) is an initiative to install a Cordilleran-scale open-data network in Canada with the goal of holistically examining the Earth system from the core to the magnetosphere. Building on the scientific momentum of previous Earth systems research and data acquisition initiatives in North America (e.g. Lithoprobe (1984 to 2004) and EarthScope
- [Episodic Forearc Sliver Creep during Relocking of the Nicoya, Costa Rica, Megathrust: An Unexpected Observation](https://www.seismosoc.org/presentations/episodic-forearc-sliver-creep-during-relocking-of-the-nicoya-costa-rica-megathrust-an-unexpected-observation/) - Following the 2012 Mw 7.6 Nicoya, Costa Rica earthquake, campaign and continuous GPS were used to collect 5 years of postseismic surface deformations. Linear yearly velocities show reversal from uniform seaward to uniform landward motion. This transition from afterslip to interseismic motion is expected. We also observe, unexpectedly, an intervening episode of purely northwestward trench-parallel
- [High Latitude Telemetry: Trades between Sample Rate, Power and Latency](https://www.seismosoc.org/presentations/high-latitude-telemetry-trades-between-sample-rate-power-and-latency/) - High-latitude telemetry is limited by communication network infrastructure, both terrestrial and space based. Few high-latitude regions of the Earth have cabled Internet or mains power, and satellite coverage is often constrained to polar orbiting constellations. These limitations are further complicated by extreme environmental conditions, months without solar charging, and costly logistics. In 2006, the IRIS
- [Temporal Changes of Seismic Velocities in the San Jacinto Fault Zone Associated with the 2016 Borrego Springs Earthquake](https://www.seismosoc.org/presentations/temporal-changes-of-seismic-velocities-in-the-san-jacinto-fault-zone-associated-with-the-2016-borrego-springs-earthquake/) - We study temporal changes of seismic velocities associated with the June 2016 Mw 5.2 Borrego Springs earthquake that occurred at 12 km depth in the San Jacinto fault zone. This is done with 9 component Green’s function estimates from daily cross correlation functions of ambient noise between stations of two spatially dense linear arrays. The
- [Long-Term and Short-Term Slow Slip Events at the Southcentral Alaska Subduction Zone](https://www.seismosoc.org/presentations/long-term-and-short-term-slow-slip-events-at-the-southcentral-alaska-subduction-zone/) - Slow Slip Events (SSEs) have been discovered at the Southcentral Alaska Subduction Zone since GPS measurement started in Alaska in 1993. Ohta et al. [2006] identified a 3 year long-term SSE between 1998 and 2001 in Upper Cook Inlet. Wei et al. [2012] found another SSE between 2010 and 2011 in Lower Cook Inlet. Fu
- [How Are Fault Zone Architecture and Mode of Slip Affected by Normal Stress and Alternating Cycles of Gouge Production and Attenuation?](https://www.seismosoc.org/presentations/how-are-fault-zone-architecture-and-mode-of-slip-affected-by-normal-stress-and-alternating-cycles-of-gouge-production-and-attenuation/) - The structural style of a fault is generally thought to reflect its mechanical behavior. Stick slip behavior is associated with simple narrow fault zones that have a single high-strain core. These are commonly developed from quartzo-feldspathic protoliths and this structural style is thought to result from the positive feedback between comminution and transformation weakening (Chester
- [Earthscope Transportable Array in Alaska: Overview and Future Plans](https://www.seismosoc.org/presentations/earthscope-transportable-array-in-alaska-overview-and-future-plans/) - The Alaska Transportable Array deployment was completely installed as of Sept 2017, totaling 280 stations, with 194 new stations and 86 existing stations, 28 of those upgraded with new sensor emplacement. We briefly summarize the deployment of this seismic network, describe the added meteorological instruments and soil temperature profilers, and review the overwinter performance, current
- [Displaying Multiple Data Types in the Geogateway Public Mapping System Inclucing a System for Rapid Surface Fracture Detection in Raw and Unwrapped Radar Interferograms](https://www.seismosoc.org/presentations/displaying-multiple-data-types-in-the-geogateway-public-mapping-system-inclucing-a-system-for-rapid-surface-fracture-detection-in-raw-and-unwrapped-radar-interferograms/) - A new component of the public GeoGateway mapping system allows determination and display of instances and networks of fault slip from radar interferometer observations of the earth’s surface. This component has added value through integration with a system that supports optional layered display of GPS stations, velocities, and patterns; radar interferometric images and displacement profiles;
- [Plate Boundary Observatory GNSS Operations in Alaska: Challenges and Performance](https://www.seismosoc.org/presentations/plate-boundary-observatory-gnss-operations-in-alaska-challenges-and-performance/) - The EarthScope Plate Boundary Observatory (PBO) GNSS network, funded by the NSF and operated by UNAVCO, in Alaska is comprised of 140 permanent GPS and GNSS stations. Of the Alaska portion of the network, 87 stations sit within the subduction zone footprint, including the volcano clusters on Akutan, Augustine, and Unimak. UNAVCO operates 18 real-time
- [On the Nature of Higher-Order Ambient Seismic Field Correlations](https://www.seismosoc.org/presentations/on-the-nature-of-higher-order-ambient-seismic-field-correlations/) - We find that higher-order ambient seismic field correlations, specifically C3 (correlation of the coda of correlations) of long-duration data sets from Southern California are symmetric despite the fact that the background wavefield is strongly directional. We demonstrate that this symmetry arises primarily from the structure of the C3 time series analysis, rather than the diffuse
- [Developments in Propagation of Seismic Waves with the Generalized Finite Difference Method: Application at Interfaces](https://www.seismosoc.org/presentations/developments-in-propagation-of-seismic-waves-with-the-generalized-finite-difference-method-application-at-interfaces/) - The meshless generalized finite difference method is applied to solve the problem of seismic wave propagation. Schemes in generalized finite differences are obtained for the decoupled system P-SV and SH in homogeneous media and its stability is analyzed. Heterogeneous schemes in generalized finite difference for heterogeneus media, made up of different layers or subdomains are
- [Previsioni Operative Del Terremoto, Sōsa-Jō No Jishin Yochi, and Operational Earthquake Forecasts: Exploring How Operational Earthquake Forecasts Are Communicated in Italy, Japan, New Zealand, and the United States](https://www.seismosoc.org/presentations/previsioni-operative-del-terremoto-sosa-jo-no-jishin-yochi-and-operational-earthquake-forecasts-exploring-how-operational-earthquake-forecasts-are-communicated-in-italy-japan-new-zealand-and-the/) - Earthquake forecasts have been produced by statistical seismologists in a variety of forms for almost forty years. These forecasts, meant to illuminate potential futures of earthquake sequences, have undergone a variety of changes in that time, with the goal of clearly and usefully communicating scientific information to key stakeholders (e.g., decision makers, emergency managers, building
- [Comparison between Seismological Characteristics of Underground Nuclear Explosions and Subsequent Cavity Collapses at North Korea Test Site](https://www.seismosoc.org/presentations/comparison-between-seismological-characteristics-of-underground-nuclear-explosions-and-subsequent-cavity-collapses-at-north-korea-test-site/) - Since 2006, North Korea conducted 6 underground nuclear explosions at its test site near the China-North Korea border. Due to its large magnitude of mb(Lg)=5.56, the explosion detonated on 3, September 2017 caused subsequent cavity collapses, i.e., the 3 September 2017 event [mb(Lg)=3.95] 8 minutes after the test, the 23 September and 12 October 2017
- [Shear-Wave Velocity Model of the Santiago de Chile Basin as a Basis for the Identification of Stratigraphic and Topographic Site Effects](https://www.seismosoc.org/presentations/shear-wave-velocity-model-of-the-santiago-de-chile-basin-as-a-basis-for-the-identification-of-stratigraphic-and-topographic-site-effects/) - Sedimentary basins in seismic hazard areas are often sites of elevated seismic risk due to seismic wave resonance that enhance the seismic shaking in connection with dense urbanization and the location of infrastructure. Measurements of seismic noise at 146 sites have been carried out in the northern part of the Santiago de Chile basin first
- [Global-Scale Full Waveform Ambient Noise Inversion](https://www.seismosoc.org/presentations/global-scale-full-waveform-ambient-noise-inversion/) - In earthquake tomography, modern tomographic methods exploit waveforms for the benefit of improved resolution. However, these techniques cannot be applied to noise correlation functions without knowing the distribution of noise sources. To overcome this limitation, we develop a method – referred to as full waveform ambient noise inversion – that is valid for arbitrary noise
- [Cybershake Models of Seismic Hazards in Southern and Central California](https://www.seismosoc.org/presentations/cybershake-models-of-seismic-hazards-in-southern-and-central-california/) - CyberShake is a high-performance computational platform developed by the Southern California Earthquake Center (SCEC) to produce seismic hazard models from large suites of earthquake simulations. Code optimization and the development of workflow tools on the NCSA Blue Waters and OLCF Titan supercomputers have substantially reduced the computational costs. A recent workflow efficiently utilized both machines
- [Can the Earthquake Site Response Be Predicted by the Ambient Noise Amplitude? Insight from Two Case Studies](https://www.seismosoc.org/presentations/can-the-earthquake-site-response-be-predicted-by-the-ambient-noise-amplitude-insight-from-two-case-studies/) - While earthquake-based approaches such as the standard spectral ratio (SSR) require good quality records of numerous earthquakes, the use of ambient noise appears as a suitable possible solution for easy and rapid site effect assessments. Two main approaches are tested here: the horizontal-to-vertical spectral ratio (HVSR) and the noise-based standard spectral ratio (SSRn). The HVSR
- [Earthquake Early Warning Feasibility Study for the New Madrid Seismic Zone](https://www.seismosoc.org/presentations/earthquake-early-warning-feasibility-study-for-the-new-madrid-seismic-zone/) - Research in the last decade on Earthquake Early Warning Systems (EEWSs) has undergone rapid development in terms of theoretical and methodological advances in real-time data analysis, improved telemetry, and computer technology and is becoming a useful tool for practical real time seismic hazard mitigation. The main focus of this study is to undertake a feasibility
- [The Characteristics of κ0 in Longmenshan Region and Its Application in Estimation of Source, Path, and Site Parameters](https://www.seismosoc.org/presentations/the-characteristics-of-κ0-in-longmenshan-region-and-its-application-in-estimation-of-source-path-and-site-parameters/) - In this study, data recorded from 2009 to 2015 by 104 strong motion stations and 36 seismic stations are used to study the characteristics of κ0 in Longmenshan region. The average κ0 of Songpan-Garze Orogen (SGO) and Western Sichuan Basin (WSB) is 0.0227 ± 0.0065 s and 0.0423 ± 0.0107 s, respectively. The difference may
- [Joint Body-Wave and Surface-Wave Tomography over a Partially Collapsed Nuclear Test, Nevada National Security Site](https://www.seismosoc.org/presentations/joint-body-wave-and-surface-wave-tomography-over-a-partially-collapsed-nuclear-test-nevada-national-security-site/) - We present preliminary P-wave and S-Wave velocity tomograms over a partially collapsed nuclear test at the Nevada National Security Site (NNSS). The HADDOCK legacy nuclear test was conducted in 1964 with an announced yield of less than 20 kilotons and depth-of-burial of 364 meters. The test is unusual in that the collapse of the test
- [Development of a United States Community Shear Wave Velocity Profile Database](https://www.seismosoc.org/presentations/development-of-a-united-states-community-shear-wave-velocity-profile-database/) - We describe a multi-institution effort to develop an open-access shear-wave velocity (VS) profile database (PDB), which will include a public repository for VS profile data and associated metadata in the United States. VS profiles are an essential resource for ground motion modeling and other applications. The minimum requirements for a site to be included in
- [A FAST Data-Mining Approach for Similar Earthquake Detection](https://www.seismosoc.org/presentations/a-fast-data-mining-approach-for-similar-earthquake-detection/) - The Fingerprint and Similarity Thresholding (FAST) earthquake detection algorithm finds small earthquakes hidden in continuous seismic data through an uninformed search for similar signals at all times (Yoon et al., 2015). FAST does not assume prior knowledge of template waveforms, nor does it use labeled earthquake waveform examples to recognize new earthquakes, which are examples
- [Multiscale Analysis of the Global Seismicity](https://www.seismosoc.org/presentations/multiscale-analysis-of-the-global-seismicity/) - We mapped at a global scale the Gutenberg-Richter parameters and the average seismic energy release rate using a novel multiscale approach. This approach consist essentially in considering all the possible spatial scales around a given point and extracting a robust median from the computed b-values. This approach has been shown to have the capability of
- [Earthquake-Induced Gravity Changes as Precursors of the Direct Seismic Waves](https://www.seismosoc.org/presentations/earthquake-induced-gravity-changes-as-precursors-of-the-direct-seismic-waves/) - After an earthquake, the earliest deformation signals are not expected to be carried by the fastest (P) elastic waves but by the speed-of-light changes of the gravitational field. The observations of these weak signals, and their full understanding, would provide a new data type with a strong potential for a rapid estimate of the earthquake
- [Using the Large–n  Array to Constrain Shallow Velocity Structure in Oklahoma](https://www.seismosoc.org/presentations/using-the-large-n-array-to-constrain-shallow-velocity-structure-in-oklahoma/) - The determination of earthquake source parameters of small local earthquakes through waveform modeling requires a good velocity model. The question is how the data from Large-N deployments can help define the model. The data sets of the 2016 YW array in Oklahoma permit a comparison of upper crustal models determined from teleseismic P-wave receiver functions
- [Interactive Block Thresholding for Seismic Signal Processing](https://www.seismosoc.org/presentations/interactive-block-thresholding-for-seismic-signal-processing/) - A software tool has been developed to utilize time-frequency representations (TFR) of time domain signals based on the continuous wavelet transform (CWT) where the seismogram is converted into a 2D map of wavelet scale (analogous to Fourier period) as a function of time. The 2D map is an intuitive description of the signal since major
- [A Century Later:  An Historical Novel of the 1918 Puerto Rico Earthquake and Tsunami](https://www.seismosoc.org/presentations/a-century-later-an-historical-novel-of-the-1918-puerto-rico-earthquake-and-tsunami/) - A Century Later is an historical novel based on the life of a Catholic nun who died in the San Antonio Hospital in Mayagüez, Puerto Rico, as a consequence of the October 11, 1918, M 7.3 earthquake. During 100 years her story and tragedy were unknown. The author, Fernando Bayrón Toro, a professor, historian, writer,
- [Application of Near-Source Factors to Deterministic Response Spectra](https://www.seismosoc.org/presentations/application-of-near-source-factors-to-deterministic-response-spectra/) - Response spectra for use in design of new buildings are presented in ASCE 7-16. The ASCE 7-16 design response spectra are to be based on both a probabilistic evaluation and a deterministic evaluation. For the evaluating design deterministic maximum component (RotD100) spectra, National Earthquake Hazards Reduction Program (NEHRP) factors as recommended in ASCE 7-16 are
- [A 2000 Year Lacustrine Paleoseismic Record on the Peninsular Segment of the Northern San Andreas Fault at Lake Merced, San Francisco](https://www.seismosoc.org/presentations/a-2000-year-lacustrine-paleoseismic-record-on-the-peninsular-segment-of-the-northern-san-andreas-fault-at-lake-merced-san-francisco/) - The Peninsula section of the San Andreas Fault is an obvious and significant hazard to San Francisco and peninsula cities, however the history past events on the SAF on the peninsula is poorly known. We opened a paleoseismic site at Lake Merced, within the city of San Francisco. The lake may be an asymmetrical pull-apart
- [Quantifying the Value of Geodetic Data for Earthquake Early Warning](https://www.seismosoc.org/presentations/quantifying-the-value-of-geodetic-data-for-earthquake-early-warning/) - The value of geodetic data towards rapid non-saturating magnitude and source estimation for medium-to-large earthquakes has been thoroughly quantified and studied over the past decade. These efforts have led to the development of several GNSS-based algorithms for earthquake and tsunami early warning. There are still however questions as to how valuable the improved magnitude and
- [Accounting for Vs Uncertainty in Seismic Site Response Analyses Using the Experimental Site Signature: A Case Study of the Garner Valley Downhole Array](https://www.seismosoc.org/presentations/accounting-for-vs-uncertainty-in-seismic-site-response-analyses-using-the-experimental-site-signature-a-case-study-of-the-garner-valley-downhole-array/) - This presentation compares measured and predicted seismic site response at the Garner Valley Downhole Array (GVDA) using a wide range of shear wave velocity (Vs) profiles developed from both borehole methods and inversion of surface wave data. Only low amplitude ground motions, resulting in approximately linear-viscoelastic site response between the downhole accelerometer and the surface
- [Evidence for Segmented Ruptures in Cascadia, an Analysis of Alternatives](https://www.seismosoc.org/presentations/evidence-for-segmented-ruptures-in-cascadia-an-analysis-of-alternatives/) - Evidence of segmented ruptures along the Cascadia margin comes in the form of correlated turbidites offshore, lacustrine turbidites, and coastal paleoseismic records. Alternatives to segmentation of earthquake frequency have been suggested based on slope stability, sediment supply, and variation in local ground motions. Steeper slopes in S. Cascadia have been suggested as a mechanism to
- [Near-Field Modeling of the Source Physics Experiments (SPE) Phase I](https://www.seismosoc.org/presentations/near-field-modeling-of-the-source-physics-experiments-spe-phase-i/) - Phase I of the Source Physics Experiment was conducted at Nevada NNSS site in granite. The goal of this experiment was to study the ground motion generated by underground chemical explosion sources. Of particular interest is the understanding of mechanisms of shear wave generation observed during underground explosions, which may look like natural seismicity in
- [The Fault Geometry Explains the Rupture Complexity of the 2012 Mw 8.6 Indian Ocean Earthquake](https://www.seismosoc.org/presentations/the-fault-geometry-explains-the-rupture-complexity-of-the-2012-mw-8-6-indian-ocean-earthquake/) - The 2012 Mw 8.6 and Mw 8.2 Indian Ocean earthquakes, the largest instrumentally recorded strike-slip events, are reportedly associated with intriguing fault rupture geometry. The westward directionality of propagation and aftershocks of the Mw 8.6 mainshock had implied a causal relation to a complex geometry involving conjugate fault-legs spanning several hundreds of kilometers (e.g.: Meng
- [On Implications of Advances in the Theory of Anelastic Seismic Wave Propagation](https://www.seismosoc.org/presentations/on-implications-of-advances-in-the-theory-of-anelastic-seismic-wave-propagation/) - Recent advances in the theory and modeling of anelastic seismic waves reveal new insights regarding characteristics of seismic waves in the Earth that are not apparent from elastic models. Examples of insights, as implied by general viscoelastic solutions for P and S body waves, reflection-refraction coefficients, Rayleigh- and Love-Type surface waves, head waves, and general
- [2018 U.S. National Seismic Hazard Models](https://www.seismosoc.org/presentations/2018-u-s-national-seismic-hazard-models/) - The U.S. National Seismic Hazard Model (NSHM) will be updated in 2018 and 2020 to introduce new scientific data and models that have become available over the past years. These updates are planned to allow more time for the provisions update committee to analyze the consequences of the hazard model changes in the design criteria.
- [South America Seismic Hazard, Risk, and Design](https://www.seismosoc.org/presentations/south-america-seismic-hazard-risk-and-design/) - South America is one of the most earthquake prone regions of the world. During the past century, earthquakes have caused billions of dollars of damage and tens of thousands of casualties across the northern and western part of the South American continent. The seismic activity in this continent is characterized by the South American Subduction
- [The Effects of Roughness and Off-Fault Plasticity on the Rupture Process during Multiple Slip Events](https://www.seismosoc.org/presentations/the-effects-of-roughness-and-off-fault-plasticity-on-the-rupture-process-during-multiple-slip-events/) - Measurements of fault geometry show that faults are rough at all scales. This deviation from planarity results in geometric asperities, which affect the nucleation and propagation of shear rupture. Simulations of the response to slow tectonic loading of rough faults governed by rate and state friction in an 2-D elastic medium (Tal et al., 2018)
- [Tsunami Threat Assessment for the North and Central Pacific Coast of Costa Rica](https://www.seismosoc.org/presentations/tsunami-threat-assessment-for-the-north-and-central-pacific-coast-of-costa-rica/) - Costa Rica has over 600 beaches, most of them populated. Tourism is a major economic activity of these coastal communities, present all year round due to tropical weather. There is a currently ongoing project to elaborate tsunami evacuation maps for the North and Central Pacific Coast of Costa Rica, funded by the National Emergency Commission
- [Considering Green’s Functions in Back-Projection](https://www.seismosoc.org/presentations/considering-greens-functions-in-back-projection/) - Back-projection methods have become popular and are widely used to track the rupture process of moderate to large earthquakes. However, there are problems in imaging detailed processes of earthquakes with smaller source dimensions. We developed a new inversion method, Image Deconvolution Back-Projection (IDBP) to determine the sources of high frequency energy radiation by linear inversion
- [Anomalous High Stress Drop Earthquake Produced by Compressive Fault Steps in the West Bohemia Swarm Region](https://www.seismosoc.org/presentations/anomalous-high-stress-drop-earthquake-produced-by-compressive-fault-steps-in-the-west-bohemia-swarm-region/) - Analysis of observations of the 2008-2014 seismic activity in West Bohemia, Czech Republic, provides evidence of interaction of compressive fault steps which induced an anomalously strong earthquake. The studied focal zone is formed by two parallel strike-slip faults with a step and overlap of about 200 m. The fault segments were activated successively by the
- [The Necessity for Long-Term OBS Deployments in Understanding Mid-Ocean Ridge Processes](https://www.seismosoc.org/presentations/the-necessity-for-long-term-obs-deployments-in-understanding-mid-ocean-ridge-processes/) - Technological advances now allow Ocean Bottom Seismographs (OBS) to be deployed for over a year, recording at high sample rates. This provides the opportunity for sustained long-term observations at individual sites as opposed to brief snap-shots of seafloor seismic activity, often at disparate sites. This is particularly important in understanding the mid-ocean ridge (MOR) system,
- [Distributed Acoustic Sensing of the Seismic Wavefield at SAFOD](https://www.seismosoc.org/presentations/distributed-acoustic-sensing-of-the-seismic-wavefield-at-safod/) - An OptaSense Distributed Acoustic Sensing (DAS) model ODH3.1 was used to record local, regional and teleseismic earthquakes for one month at SAFOD using an optical fiber cemented behind casing. The fiber was interrogated between the surface and 800 m depth (top of basement). With this recording geometry, the DAS system captures the full vertical wavefield
- [MyShake – Building an Earthquake Early Warning System Using Smartphones](https://www.seismosoc.org/presentations/myshake-building-an-earthquake-early-warning-system-using-smartphones/) - MyShake is a global smartphone seismic network that harnesses the power of crowdsourcing. It is driven by the citizen scientists that running MyShake on their smartphones to detect earthquake. It has two component: an android application running on the personal smartphones to detect earthquake-like motion, and a network detection algorithm to aggregate results from multiple
- [Seismic Evidence for Complex Faulting through the Gulf of Guayaquil](https://www.seismosoc.org/presentations/seismic-evidence-for-complex-faulting-through-the-gulf-of-guayaquil/) - Along the Ecuadorian margin, the North Andean Sliver is moving in the northeastward direction due to the oblique subduction of the Nazca plate. The opening of the gulf of Guayaquil is a consequence of this motion. Two principal models compete to explain the opening. One proposes an opening achieved essentially with strike slip motion along
- [Large-N Gradiometry with Nodal Instrument Arrays](https://www.seismosoc.org/presentations/large-n-gradiometry-with-nodal-instrument-arrays/) - Observations of the wave field at the surface of the Earth are fully characterized at a point by 3 orthogonal vector displacements, 3 horizontal strains, and 3 rigid body rotations. These 9C seismic observables can further be interpreted with a wave propagation model to infer basic attributes of the seismic waves including wave type (from
- [GPS Measurements of Large Oscillations of a Tall Building due to a Magnitude 7.3 Earthquake](https://www.seismosoc.org/presentations/gps-measurements-of-large-oscillations-of-a-tall-building-due-to-a-magnitude-7-3-earthquake/) - Tall buildings, increasing in number throughout the world, including the Middle East, are greatly affected by long trains of seismic waves from regional earthquakes. Seismic motions, measurable with accurate GPS, are greatly amplified with the increasing height of buildings. Here we show the first successful GPS measurements of the motions of the 414 m tall,
- [Tsunami Public Awareness and Education Strategy for the Caribbean and Adjacent Regions – Principles and Implementation](https://www.seismosoc.org/presentations/tsunami-public-awareness-and-education-strategy-for-the-caribbean-and-adjacent-regions-principles-and-implementation/) - At least 75 tsunamis have impacted the region over the last 500 years causing over 3000 deaths. Tsunamis are rapid onset potentially high impact hazards. Due to increasing urbanisation in coastal locales and the low frequency of tsunamis, preparedness and response must be in the psyche of our vulnerable populations to save lives and property.
- [Ground Motion Recordings from the 8 August 2017 Ms 7.0 Jiuzhaigou Earthquake](https://www.seismosoc.org/presentations/ground-motion-recordings-from-the-8-august-2017-ms-7-0-jiuzhaigou-earthquake/) - On August 8 2017, an Ms 7.0 earthquake struck the Jiuzhaigou County, Sichuan Province, China. 67 stations of China Strong Motion Network Center (CSMNC) were triggered and recorded ground motions from the event. There were eight stations with epicentral distance less than 100 km of the earthquake. Two temporary stations were installed near station Jiuzhai
- [Ground Motion Estimation of Recently Identified Crustal Faults in Central Chile](https://www.seismosoc.org/presentations/ground-motion-estimation-of-recently-identified-crustal-faults-in-central-chile/) - Lately, there have been newly identified, potentially seismogenic crustal faults (PSCFs) in Chile, many of them are now published by the South America Risk Assessment Project of the Global Earthquake Model. These faults pose a great risk to the community and infrastructure; therefore, it is necessary to estimate ground motion that can be produced by
- [Near Real-Time Network-Wide Station State of Health and Waveform Quality Monitoring](https://www.seismosoc.org/presentations/near-real-time-network-wide-station-state-of-health-and-waveform-quality-monitoring/) - The Pacific Northwest Seismic Network is responsible for monitoring seismic activity in Cascadia and is also part of the USGS ShakeAlert earthquake early warning system. Part of our mission is operating and maintaining our network of over 400 stations. Fulfilling our role effectively requires monitoring station state of health metrics, those related to waveform quality
- [Plate Boundary Observatory GNSS Real Time Field Operations](https://www.seismosoc.org/presentations/plate-boundary-observatory-gnss-real-time-field-operations/) - The EarthScope Plate Boundary Observatory (PBO) GNSS network, funded by the NSF and operated by UNAVCO, is comprised of ~1100 permanent GPS and GNSS stations across the United States. While the network was originally designed for tectonic and volcanic analysis, it has proven to be of significant value to stakeholders who use real-time data streams
- [An Overview of the Use of NSHMP Products in the Insurance Industry](https://www.seismosoc.org/presentations/an-overview-of-the-use-of-nshmp-products-in-the-insurance-industry/) - The earthquake hazard program by the United States Geological Survey (USGS) develops a number of useful products including the national hazard maps based on the National Seismic Hazard Mapping Project (NSHMP). These maps are used extensively to design and retrofit buildings and different structures like bridges. The multi-billion-dollar insurance industry also uses the hazard information
- [Earthquake Characterization with a Dark Fiber DAS Array in Sacramento, California](https://www.seismosoc.org/presentations/earthquake-characterization-with-a-dark-fiber-das-array-in-sacramento-california/) - Distributed Acoustic Sensing (DAS) is a novel seismological tool that uses optical Rayleigh scattering inside of a fiber-optic to measure ground motions over tens of linear kilometers at meter scale spatial resolution. We propose that the combination of DAS and excess telecommunications infrastructure – so-called “dark fiber” – can be used to address a diversity
- [Criteria Used to Characterize and Classify Discrete Clusters of Earthquakes from 2012-2016 in North-Central Arkansas as Natural or Induced](https://www.seismosoc.org/presentations/criteria-used-to-characterize-and-classify-discrete-clusters-of-earthquakes-from-2012-2016-in-north-central-arkansas-as-natural-or-induced/) - North-central Arkansas has seen a significant increase in both unconventional resource development and seismicity within the Fayetteville Shale Play since 2009. The study area is historically seismically active, but it has seen a significant increase in seismic activity since 2009 that is likely a combination of both natural and human-induced clusters and even swarms of
- [Probabilistic Seismic Hazard Analysis Using Non-Ergodic Ground-Motion Prediction Equations](https://www.seismosoc.org/presentations/probabilistic-seismic-hazard-analysis-using-non-ergodic-ground-motion-prediction-equations/) - With an increasing number of strong-motion records over the last decade, it has become clear that there are significant differences in ground-motion scaling even within relatively small regions such as California. These differences are typically not modeled in ground-motion prediction equations (GMPEs)-they are based on the so-called ergodic assumption. By including the systematic source, path
- [Seismic Risk Assessment in Areas with Low-Quality Data: The Case of the Jama-Pedernales 7.8mw Earthquake and the Detailed Study of Portoviejo (Ecuador) – Part 1: Data Processing](https://www.seismosoc.org/presentations/seismic-risk-assessment-in-areas-with-low-quality-data-the-case-of-the-jama-pedernales-7-8mw-earthquake-and-the-detailed-study-of-portoviejo-ecuador-part-1-data-processing/) - Currently, even in socioeconomically deprived areas, useful data for earthquake risk assessment is present. The problem in fact is that those data need extensive preprocessing before being used for risk analyses. Although this situation preclude their use for quick response in emergency situations, detailed studies can be conducted with ample time allowed. An important issue
- [Complexity of Spatiotemporal Microfracturing Processes and Stress Field Evolution before and after Fault Slip: Laboratory Perspective](https://www.seismosoc.org/presentations/complexity-of-spatiotemporal-microfracturing-processes-and-stress-field-evolution-before-and-after-fault-slip-laboratory-perspective/) - In this study we investigate details of spatial and temporal evolution of the stress field and damage at a pre-existing fault surface during laboratory stick-slip friction experiments performed on Westerly Granite samples. Specimens were deformed at constant strain rate of 3×10-6 s-1 and confining pressures of 150 MPa. Here we analyze a series of 6
- [Collecting New High-Resolution Seismic Data across the Hayward Fault Zone](https://www.seismosoc.org/presentations/collecting-new-high-resolution-seismic-data-across-the-hayward-fault-zone/) - The Hayward Fault is an active strike-slip fault trending southeast to northwest through the east bay region of California’s San Francisco Bay Area, which has caused approximately 100 km of offset during the last 10 Ma. Along a 30 km segment, between the City of Oakland in the north and the City of Fremont in
- [The 2017/09/08 Mw 8.2 Tehuantepec, Mexico, Earthquake: A Large but Compact Dip-Slip Faulting Event Severing the Slab](https://www.seismosoc.org/presentations/the-2017-09-08-mw-8-2-tehuantepec-mexico-earthquake-a-large-but-compact-dip-slip-faulting-event-severing-the-slab/) - The Mw 8.2 September 8 earthquake occurred in the middle of the “Tehuantepec Gap,” a segment of the Mexican subduction zone that has no historical mentions of a large earthquake. It was, however, not the expected subduction megathrust earthquake, but rather an intraplate, normal faulting event, in the subducting oceanic Cocos plate. We inverted for
- [Developing Software to Evaluate the Liquefaction Potential by Using 2D Numerical Modeling: Applications](https://www.seismosoc.org/presentations/developing-software-to-evaluate-the-liquefaction-potential-by-using-2d-numerical-modeling-applications/) - This article describes the developing of a computer tool to evaluate the liquefaction potential in seismic zones. The tool consists of: i) a pre-processing script, ii) calculation or process script, and iii) a post-processing script. The pre and post-processing stages are carried out by using the Matlab software through the GUIDE development environment, while the
- [Volcanic Thunder from Explosive Eruptions at Bogoslof Volcano, Alaska](https://www.seismosoc.org/presentations/volcanic-thunder-from-explosive-eruptions-at-bogoslof-volcano-alaska/) - Lightning often occurs during ash-producing eruptive activity and its detection is now being used in volcano monitoring for rapid alerts. We report on infrasonic and sonic recordings of the related, but previously undocumented, phenomenon of volcanic thunder. We observe volcanic thunder during the waning stages of two explosive eruptions at Bogoslof volcano, Alaska, on a

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## Sessions

- [2018 Annual Meeting](https://www.seismosoc.org/sessions/2018/) - Miami Florida USA May 14 -17 2018 Co-Chairs: Carol S. Prentice, United States Geological Survey (USGS) Elizabeth A. Vanacore, University of Puerto Rico at Mayaguez Sergio Barrientos, University of Chile Christa G. von Hillebrandt-Andrade, National Oceanic and Atmospheric Administration (NOAA) Xyoli Pérez Campos, National Autonomous University of Mexico Mario C. Ruiz, Instituto Geofisico Escuela Politecnica Nacional, Ecuador Members: log-in to view presentations from each session.
- [3D/4D Seismic Imaging and Their Interpretation for Seismic Hazard Assessment](https://www.seismosoc.org/sessions/3d-4d-seismic-imaging-and-their-interpretation-for-seismic-hazard-assessment/) - Thanks to the recent development of imaging and monitoring techniques, we can obtain much higher spatial resolution of subsurface structures and/or time-lapse changes of them. In previous years, imaging and monitoring techniques have developed rapidly due to the advent of high-density networks, new modeling techniques and unprecedented computation capacities. In addition to using them for interpreting subsurface geology and mechanics, such 3D/4D structural information is useful for modeling and interpreting high-frequency seismic waves or understanding the dynamic behaviors of structures, both of which are important for seismic hazard assessment. In this session, we would like to cover both theoretical and methodological aspects as well as novel approaches for solving common practical problems for 3D/4D imaging and monitoring. We welcome contributions for the interpretation of obtained structural information for seismic hazard assessment such as ground motion prediction, more accurate estimation of earthquake magnitude and moment tensor and understanding the near-surface nonlinear effects. We further encourage abstracts focusing on multiscale imaging applications which involve novel processing such as higher-order correlations, double beamforming, multi-dimensional deconvolution, nonlinear optimization techniques, machine learning and large-scale data analysis or very dense receiver array analysis. Presentations related to amplitude extraction, attenuation, higher-mode Rayleigh/Love waves, body waves or usage of multi-component signals are also encouraged.
- [The 8th September Mw8.2 Tehuantepec and 19th September Mw7.1 Puebla-Morelos, Mexico Earthquakes: Reconnaissance Findings and Impact on Urban Areas in South-central Mexico](https://www.seismosoc.org/sessions/the-8th-september-mw8-2-tehuantepec-and-19th-september-mw7-1-puebla-morelos-mexico-earthquakes-reconnaissance-findings-and-impact-on-urban-areas-in-south-central-mexico/) - On September 8th, 2017 a Mw8.2 intermediate-depth, normal-faulting earthquake struck southeastern Mexico. The earthquake, with an epicentral location near the coast of Chiapas, is the largest recorded event in Mexico’s recent history. The Tehuantepec event resulted in many casualties and collapses, as well as landslides and damage to the infrastructure in several cities and towns in the states of Oaxaca and Chiapas. Soon after, on September 19th, 2017, a Mw7.1 intraslab, normal faulting earthquake occurred in central Mexico. The earthquake, approximately 120 km from Mexico City, caused the collapse of more than 40 buildings and affected infrastructure operation not only in the capital of Mexico, but in several urban areas near the epicentral region. The official death toll for both events is 471 people. This session covers many engineering aspects of both events. Topics include, but are not limited to, strong ground motion observations and networks, macroseismic intensities, broadband ground motion simulations, site effects in the Mexico City Basin and other urban areas, soil-structure and site-city interactions, building codes and their implications in similar seismic prone regions together with hazard and risk management issues.
- [Adaptation of New Technologies and Methods to Drive New Discoveries in Seismology and Geodesy](https://www.seismosoc.org/sessions/adaptation-of-new-technologies-and-methods-to-drive-new-discoveries-in-seismology-and-geodesy/) - In recent years, advancements in seismology and geodesy have been made possible by innovative adaptation of new methods and technology from other fields. Improved earthquake detection and ground motion characterization have been achieved by using consumer MEMS accelerometers, consumer GPS chips, wireless nodal systems and other new sensor technology that enable dense sensor networks. Deep learning, fingerprinting and linkage methods originally developed for Internet search engines and image recognition can substantially improve our ability to detect and categorize seismic events, including earthquakes and low frequency earthquakes. In this session, we encourage submissions on any approach that expands the horizons of seismology and geodesy beyond traditional instruments and methods.
- [Advances in Explosion Seismo-Acoustic Research](https://www.seismosoc.org/sessions/advances-in-explosion-seismo-acoustic-research/) - Seismo-acoustic approaches serve as primary tools in monitoring explosions around the world. Improvements in these fields have led to new analytical techniques including correlation methods, advanced array analysis, multimodal surface wave methods and quantitative uncertainty estimates for source and propagation models and derived parameters. We invite contributions highlighting research to improve detection, location and interpretation of explosion sources, as well as associated uncertainties.
- [Advances in Seismic Site Response Studies Given Limitations in Understanding of Site Conditions](https://www.seismosoc.org/sessions/advances-in-seismic-site-response-studies-given-limitations-in-understanding-of-site-conditions/) - Site response in seismic hazard assessment studies is significantly affected by the accuracy and resolution of the near-surface material properties. Within the limitations of the understanding of site conditions, our session brings together a wide variety of topics on the advances and limitations of current methodologies for site response analysis of earthquake-induced ground motions. Our purpose is to promote discussion that bridges the gap between the empirical and simulation-based methods in estimating seismic site response. We encourage presentations on state-of-the-knowledge and -art site response analyses; the role of ergodic and non-ergodic site response studies in reducing epistemic uncertainty; the effect of variability of shear-wave velocity (VS) profiles, as a result of non-uniqueness (inversion) or lateral variations in VS (2D effects), on site response; the correlation of the site-specific high-frequency spectral decay of Fourier amplitude spectra (κ0) to the time-averaged VS of the upper 30 m from the surface (VS30) and other proxies; the performance of κ0 for shallow and deep sedimentary basins; performance, estimation and correlations of basin-depth proxies with other parameters; regionalization of crustal velocity Q models; limitations of full-waveform inversion studies; and the effectiveness of derivation of site effects in the response spectra and Fourier domain. We cap the presentations with an open discussion with all speakers regarding the overall state of knowledge about the role of site conditions in advanced site response studies. We also welcome presentations on topics related to seismic site characterization, advances in invasive/non-invasive measurement techniques, microzonation studies and particularly developments in site characterization or ground motion studies in Latin America.
- [Advances in the Theory, Modeling and Observation of Anelastic Seismic Wave Propagation - Recent Anelastic Models of the Earth](https://www.seismosoc.org/sessions/advances-in-the-theory-modeling-and-observation-of-anelastic-seismic-wave-propagation-recent-anelastic-models-of-the-earth/) - Recent advances in the theory, modeling and observation of anelastic seismic waves reveal new insights regarding methodologies to infer the anelastic structure of the Earth. For example, recent developments in general ray theory for anelastic media reveal ray paths and corresponding characteristics of travel time and attenuation curves, which are not predicted by elasticity theory or one-dimensional anelastic waves, yet have important implications for some forward modeling and inverse problems. Recent developments in elastic single- and multicomponent full waveform inversion and monitoring of exploration seismic data indicate that proper parameterization and incorporation of P- and S-wave quality factors is a critical need. This session invites papers on the latest advances in anelastic wave-propagation theory, processing/inversion methods for anelastic media, and anelastic (Q) models of the Earth, as inferred from exploration geophysics data, crustal reflection-refraction data, teleseismic data, surface-wave, ocean-acoustic, and normal-mode data. With many travel-time and amplitude anomalies yet to be explained, this session plans to be an exciting forum to review and explore implications of the latest advances in the theory and modeling of anelasticity towards explanation of some of these anomalies.
- [Advances on the Parameterization of Seismic Attenuation: Current Challenges and Opportunities](https://www.seismosoc.org/sessions/advances-on-the-parameterization-of-seismic-attenuation-current-challenges-and-opportunities/) - “The characterization of attenuation at various scales (e.g., regional or local attenuation) constitutes a critical aspect in the prediction of ground motions, site response analyses and the assessment of seismic hazards. However, isolating the effects of different attenuation mechanisms requires not only a fundamental understanding of the wave propagation phenomenon, but also a proper statistical treatment of the uncertainties associated with data collected in the field, the laboratory and through analysis of background noise and ground motion records. Hence, efforts toward defining parametric descriptors of seismic attenuation are inevitably associated with challenges in collecting reliable experimental data and the proper interpretation of their corresponding range of applicability. There is a critical need for further research on current seismic attenuation parameters to improve methodologies that measure energy dissipation in earth materials and to better understand how to capture different attenuation mechanisms at different scales. In this session, we welcome studies focused on investigating the parameterization of seismic attenuation, the limitations of the existing methodologies to capture it, the associated uncertainties and the corresponding implications on ground motion modeling, site-specific seismic hazard analysis and site response analysis. Challenges and opportunities encountered in these processes are also welcome, whether they relate to limitations of a methodology to measure a specific parameter in the field, or the introduction of new analytical methods to better decouple the effects of different attenuation mechanisms in ground motions (e.g., separating inelastic attenuation from scattering effects).”
- [Applications of Machine Learning and Data Science in Seismology](https://www.seismosoc.org/sessions/applications-of-machine-learning-and-data-science-in-seismology/) - The increase in computational capability in the past decade has made it possible to introduce and apply novel machine learning/data science algorithms and tools to the field of seismology, with the hope of extracting useful information from large and complex seismic data sets. Recent attempts in the seismology applications have shown encouraging results in, for example, seismic signal detection and classification, seismic data interpolation, earthquake parameter estimation, seismic noise analysis and reduction, subsurface structure imaging and complex signals/models visualization. More advanced techniques and algorithms are emerging with new possibilities, for instance: deep learning based on learning data representations has the potential to extract superior results from large-scale datasets. The application of these new techniques can help improve our understanding of Earth structure and seismic sources from a brand new perspective. This session invites all abstracts relevant to applications and developments of machine learning and data science in seismology.
- [Challenges and Chances for the Widespread Implementation of Earthquake Early Warning (EEW)](https://www.seismosoc.org/sessions/challenges-and-chances-for-the-widespread-implementation-of-earthquake-early-warning-eew/) - The recent strong earthquakes in Southern Mexico with magnitudes of 8.0 and 7.3 have demonstrated the usefulness of Earthquake Early Warning (EEW) to a massive audience in Latin America and the world. In the social media people showed their surprise about the existence and functionality of the Mexican EEW system and discussed whether such a system could be established in their country. We invite contributions about the possible application of EEW in Latin America and other less developed regions taking into account the specifics of the prevailing building types (e.g. adobe) and construction practices. We invite contributions proposing how EEW can be implemented in less developed nations and whether EEW could be a relatively cheap and fast way for poor countries with high seismic risk to give some protection to their populations against the massive loss of life in great earthquakes and how it can be combined, in the long term, with measures to improve the building stock. We particularly solicit studies dealing with how EEW can be effectively established and operated, including: densification of seismic networks with new low-cost EEW-compatible seismic equipment; the development of new efficient EEW methods that are robust in the face of challenging seismicity and network operation; transfer of EEW methods into operational software compatible with general seismic monitoring; the establishment of new automatic seismic processing centers in many countries; and studies dealing with technical and social aspects for delivering alerts to the general population.
- [Development and Validation of Statistical Models of Small-scale Heterogeneities](https://www.seismosoc.org/sessions/development-and-validation-of-statistical-models-of-small-scale-heterogeneities/) - “Realistic small-scale variation of the media (velocity and/or density) and surface topography is important for modeling phases and coda amplitudes of broadband waves from regional seismic (earthquakes or explosions) sources. While the precise strength, locations, sizes and shapes of the heterogeneities are often unknown, statistical characterization of the heterogeneity can be used to simulate the ground motion variability due to seismic scattering processes. A wide variety of parameterizations, however, are available to characterize the statistical models (e.g., shape of the heterogeneity power spectrum and its depth dependence, as well as crack shapes, concentrations and orientations). Different parameterizations can produce similar seismograms that match aspects of observed ground motion, so association of observations with specific scattering mechanisms that can narrow the model space is critical to confident transport of prediction capability to new source-receiver paths. We welcome submissions focused on constraining values of and reducing the number of free parameters of statistical models of media heterogeneity, on observations of seismic scattering processes and on methods and results for modeling the scattered wave fields.”
- [Early Warning for Large Earthquakes and Tsunamis: Challenges, Case Studies and Innovations](https://www.seismosoc.org/sessions/early-warning-for-large-earthquakes-and-tsunamis-challenges-case-studies-and-innovations/) - “Earthquake early warning (EEW) algorithms attempt to characterize earthquake ruptures and ground motion in real-time and provide advance notifications before the arrival of damaging seismic waves and subsequent hazards (e.g., tsunamis). EEW approaches and their products have evolved over the past decade with recent advances in instrumentation, rapid source characterization, real-time ground motion prediction and communication technologies. Today’s early warning systems can go much beyond this basic function, providing estimates of shaking intensity and potential damage for implementation of post-event emergency action plans. However, many challenges still exist in for creating effective EEW systems. For instance, while medium-sized earthquakes are sufficiently well described with very simple point source models, characterizing large ruptures is complex. Recent experiences with EEW systems that were in operation during large earthquakes (e.g. the Mw7.0 2016 Kumamoto, Japan and Mw7.1 2017 Morelos-Puebla, Mexico earthquakes), as well as offline studies, are starting to shape our expectations of the performance we can realistically expect from EEW systems. In this session, we invite scientists, engineers, practitioners and policy makers to present work related to EEW applications and case studies. Some topics might include: – innovative event recognition, source characterization and false alert avoidance algorithms; – characterization of uncertainties stemming from EEW algorithms and ground motion prediction in real-time; – comparison of point-source and finite-fault approaches; – performance assessment for long-duration and complex ruptures; – integration of real-time GPS data in EEW systems; – real-time ground motion and damage prediction; – exploration of local and global tsunami early warning; – EEW case studies, testing and performance evaluation of existing systems; and – discussion of implications for earthquake hazard, risk and response models with respect to the science community as well as private and government entities.”
- [Earthquake Source Parameters: Theory, Observations and Interpretations](https://www.seismosoc.org/sessions/earthquake-source-parameters-theory-observations-and-interpretations/) - “Understanding origin and spatio-temporal evolution of seismicity needs a careful quantitative analysis of earthquake source parameters for large sets of earthquakes in studied seismic sequences. Determining focal mechanisms, seismic moment tensors, static stress drop, apparent stress and other earthquake source parameters provides an insight into tectonic stress and crustal strength in the area under study, material properties and prevailing fracturing mode (shear/tensile) in the focal zone and allows the investigation of earthquake source processes in greater details. In addition, studying relations between static and dynamic source parameters and earthquake size is essential to understand the self-similarity of rupture process and scaling laws and to improve our knowledge on ground motion prediction equations. This session focuses on methodological as well as observational aspects of earthquake source parameters of natural or induced earthquakes in broad range of magnitudes from large to small earthquakes, including acoustic emissions in laboratory experiments. Presentations of new approaches to focal mechanisms determination, seismic moment tensors and other source parameters as well as case studies related to analysis of earthquake source parameters are welcome. We also invite contributions related to scaling of static and dynamic source parameters and to self-similarity of earthquakes.”
- [Emergency Management, Resilience and Preparedness](https://www.seismosoc.org/sessions/emergency-management-resilience-and-preparedness/) - Emergency and disaster management and preparedness approaches involve the mitigation, preparation, response and recovery and aim to reduce vulnerability to hazards and to cope with disasters from both natural events and human-induced events. The planning phase involves a coordinated, co-operative process of preparing to match anticipated urgent needs with all available resources. All the phases require research, evaluation, testing/validation, implementation and updating; the final product will be a living emergency plan that should be periodically reviewed and adapted to changing circumstances and real-life situations. In this session, we call for participants to focus on emergency planning, management, continuity of operations, technology, social processing and guidance. In a real world that is subject to accelerating physical, social and economic change, the challenge of managing emergencies well depends on effective planning and foresight and the ability to connect disparate elements of the emergency response into coherent strategies.
- [Environmental Seismology: Glaciers, Rivers, Landslides and Beyond](https://www.seismosoc.org/sessions/environmental-seismology-glaciers-rivers-landslides-and-beyond/) - Environmental seismology is the study of seismic signals generated at and near the surface created by environmental forces in the atmosphere, hydrosphere or solid Earth. Contributions to this session are welcome on a wide variety of topics including (but not limited to) the seismic signals associated with landslides, rock falls, debris flows, lahars, snow avalanches, cliff or pinnacle resonance, bedload transport, fluid flow in open and confined channels, open water waves, tides, glacial stick-slip, iceberg calving, crevassing, extreme wind and weather and wind turbines or other anthropogenic sources. Contributions that seek to conduct monitoring, create physical or statistical models of source processes or systems, detect events, characterize a wave propagation environment, or interact with other branches of the Earth or social sciences are additionally encouraged.
- [Essentials of Seismic Risk Estimates](https://www.seismosoc.org/sessions/essentials-of-seismic-risk-estimates/) - Estimating the seismic risk for a region is important for officials as well as for individuals for deciding what mitigating action, if any, is to be taken. The risk can be expressed in units of number of strongly affected people, fatalities, injured or monetary losses. This session will focus on methods of estimating risk and the data sets necessary to calculate it are essential elements that need to be discussed. The underlying question of seismic hazard must be understood for the region in general, although this session does not focus on it. The seismic risk problems in the regions of Central and South America are of special interest. Estimates of the differences in the seismic risk for the affluent and the poorer sections of society are invited. Methods for structural measures to reduce seismic risk have been developed, but new ideas, especially those applicable to Latin America, are welcome. Quantitative means to educate decision-makers and the public are also of interest.
- [Exploring Rupture Dynamics and Seismic Wave Propagation along Complex Fault Systems](https://www.seismosoc.org/sessions/exploring-rupture-dynamics-and-seismic-wave-propagation-along-complex-fault-systems/) - Investigations related to how complexities in fault parameters could potentially impact the behavior of earthquake rupture and affect seismic hazard are areas of active and challenging research. This session will highlight recent advances in rupture dynamics on complex fault systems. We are open to a wide range of studies related to numerical, experimental and observational fault rupture dynamic studies with heterogeneities such as fault geometry, fault roughness, frictional parameters, creeping mechanisms, stress asperities, off-fault material properties, bi-material interfaces and wedge structures along subduction zones. We also encourage contributions on research that explores links between earthquake source physics, tsunami generation/propagation and ground motion variability.
- [Fault to Seismic Hazard Assessment (Fault2SHA) in Latin (Central and South) Americas](https://www.seismosoc.org/sessions/fault-to-seismic-hazard-assessment-fault2sha-in-latin-central-and-south-americas/) - “In seismic hazard analysis, increasing importance is given to geodynamic and tectonic data for modeling seismic sources by actual faults. Fast deforming countries like California, New Zealand, Japan and Turkey that have led the development of this practice since the 90s, are now facing new lessons, whilst slowly deforming areas (i.e., Europe) are learning how to deal with their datasets. Latin America is a broad region of interest for earth scientists as it is characterized by both intense seismic activity along the subduction zones and distributed continental faulting. Assessment and mitigation of seismic hazards from the growing set of active faults identified and mapped in Latin America poses unique challenges due to the high variability of data types and qualities. This session aims to present new data sets and the latest integration of fault sources in SHA models. We invite contributions related to the description of earthquake sources, from the field to the modeling, as well as discussions about whether and how uncertainties in field data are transposed into the source models. In particular, we solicit studies that provide discussions about the comparison and analysis of fault parameters and fault models in South and Central America. We also solicit contributions on how 3D, geometrically complex fault segments are identified and defined, their impact on probabilistic seismic hazard results and studies that incorporate geodetical and geophysical observations. The session aims at linking the “New” and “Old” Worlds, i.e., the Americas and Europe, by strengthening common rules and procedures inside the international community that works on these subjects.”
- [Forecasting Aftershock Sequences in the Real World](https://www.seismosoc.org/sessions/forecasting-aftershock-sequences-in-the-real-world/) - “In the last few years, increasingly sophisticated earthquake forecast models have been applied in many regions around the globe in response to ongoing earthquake activity. Traditionally, aftershock models have been used to forecast short time-windows of days or weeks and this type of aftershock forecasting has remained the most common application. However, as demonstrated in recent New Zealand sequences (e.g., Canterbury in 2010-2011 and Kaikoura in 2016), when end-users become more familiar with forecast modelling, their need for other means of understanding the forecasting, such as through longer time frames, increases. Further, there is evidence that a variety of decisions were made by emergency managers, building engineers and key decision-makers based on these forecasts that had previously not been anticipated by the scientific community. Other complexities included forecasts and predictions made publicly by alternate theorists. Experience from New Zealand has highlighted some of the limitations in our current understanding and modeling approaches, such as: 1) understanding the forecast skill of aftershock models as they extend to longer time-periods; 2) forecast models that provide useful information for medium-term time-frames; 3) spatial distribution of earthquake sequences; 4) forecasts of ground motion and losses; and 5) communication methods and tools that allow for successful uptake of relevant information during heightened earthquake response times. In this session, we welcome presentations that cover these or any other operational earthquake forecast model development and communication topics.”
- [Ground Motion and Earthquake Engineering](https://www.seismosoc.org/sessions/ground-motion-and-earthquake-engineering/) - Modeling of ground motion and analysis of the response of structures to earthquakes are key to increasing earthquake resiliency in communities. This session solicits presentations on advances in ground motion modeling, case studies of regional ground motions, and especially the response of man-made structures to earthquakes.
- [Increasing Testability - Expanding Possibilities and Future Developments of the Collaboratory for the Study of Earthquake Predictability](https://www.seismosoc.org/sessions/increasing-testability-expanding-possibilities-and-future-developments-of-the-collaboratory-for-the-study-of-earthquake-predictability/) - “The Collaboratory for the Study of Earthquake Predictability (CSEP) has expanded over the years to many different testing areas hosted at multiple testing centers. Hundreds of earthquake forecast models have been submitted to CSEP and are being tested. New testing metrics were developed and implemented and a lot of progress was made to establish CSEP as an institution that cannot be ignored when issuing earthquake forecasts. Its rigor and independence became the standard in evaluating earthquake forecasts and in reporting on the results. Although the tests CSEP has conducted have been successful and well-received, they have also shown the limitations of the CSEP approach. What is a sufficient testing period for models? Are time-invarying models really describing the long-term seismic activity? Are long-term models testable at all? Do short-term models provide significant information for the forecasting problem or do they only model aftershock sequences? What other signals should be included in forecasting models to improve them? Do improvements in forecasting models translate into improvements of hazard models? How can the tests be improved? Many aspects of seismic hazard or earthquake forecasting remain inherently untestable if only the model forecasts are tested and not the model ingredients. We propose to create new areas of activity for CSEP, namely targeted experiments that cannot be conducted with the current CSEP software system. We solicit contributions addressing forecasting models, forecast testing problems, new ideas for CSEP experiments, possibilities of further CSEP developments, ways of expanding CSEP into the hazard and risk domain and more general views on the forecasting problem.”
- [Interaction Between Observations and Models in Seismo-volcanic Studies](https://www.seismosoc.org/sessions/interaction-between-observations-and-models-in-seismo-volcanic-studies/) - Seismo-volcanic studies demand a deep understanding of volcanic systems. Such a study requires one to determine the internal structure of volcanic edifices to illuminate the configuration of the plumbing-feeding system, the nature and role of the fluids that fill internal cracks and cavities of complex geometries, the properties of seismic waves that cross the volcanic edifice, the role of tectonic stresses and faults and many other intriguing aspects of these complex systems. Numerous seismic instruments have been deployed on active volcanoes in recent decades either in a permanent role for volcano surveillance or for temporary campaigns. We extend this invitation to discuss recent contributions in the fields of modelling, based on a foundation of observations of volcanic activity ranging from simple seismic networks to high resolution multi-parametric approaches. We expect to have an exciting interactive session between seismologists and the personnel of volcanic observatories from Latin America, USA and elsewhere.
- [Megathrust Earthquakes: Recurrence, Rupture Modes and Tsunamis](https://www.seismosoc.org/sessions/megathrust-earthquakes-recurrence-rupture-modes-and-tsunamis/) - This session will address megathrust faulting at subduction zones. Topics include: 1) patterns of earthquake recurrence; 2) differences among fault ruptures that overlap; 3) interseismic, coseismic and postseismic deformation; 4) splay faults as clues to megathrust rupture mechanics and tsunami hazards; and 5) subduction zones, as in the Caribbean, where the very occurrence of great tsunamigenic earthquakes has yet to be demonstrated.
- [Microzonation Studies - Site Effects](https://www.seismosoc.org/sessions/microzonation-studies-site-effects/) - “As the world population increasingly moves to big metropolitan urban areas, the risk associated with earthquakes increases in these areas. This is particularly evident in developing countries. Local soil conditions are a first order parameter that controls seismic response and therefore building damage due to earthquake shaking. Careful planning of urban development with respect to soil conditions must be exercised to prevent loss of structures and fatalities. Due to restricted space and city regulations, microzonation studies have gained popularity over traditional geophysical methods over the past decades as rapid, cost-effective and environmentally friendly. Damage that occurred in Mexico City due to the September 19, 2017 Puebla-Morelos earthquake, compared to damage from September 19, 1985 Michoacán earthquake, demonstrates the importance of understanding soil response and interaction with buildings for different source characteristics and soil conditions. Other recent earthquakes, such as the 2016 Pedernales earthquake in Ecuador, the 2010 Maule earthquake in Chile, and the 2010 earthquake in Haiti demonstrate the importance of site effects for damage distribution. Knowledge gained from these earthquakes can help mitigate damage from future earthquakes. This special session is about case studies of seismic microzonation around the World, what we have learned about seismic response in urban areas, and how we can help planners to develop earthquake resilient cities.”
- [New Frontiers in Seismic and Acoustic Data Analysis](https://www.seismosoc.org/sessions/new-frontiers-in-seismic-and-acoustic-data-analysis/) - Advances in computing power, novel sensing systems and analytical techniques have revealed valuable new perspectives on seismic and acoustic wave fields. For example, computationally intensive methods like the Empirical Wavelet Transform can give much sharper time/frequency representations than Fourier-based methods. Large N seismic arrays, free-flying infrasound stations and distributed fiber optic sensor cables acquire nontraditional data sets that then require new signal detection, association and location methods. This session will focus on innovative ways of presenting and analyzing seismic data, with an emphasis on new developments. We invite contributors who have developed or are exploring new techniques and/or who wish to offer relevant evaluations of widely used methodologies.
- [Numerical Modeling of Earthquake Ground Motion, Rupture Dynamics and Seismic Wave Propagation](https://www.seismosoc.org/sessions/numerical-modeling-of-earthquake-ground-motion-rupture-dynamics-and-seismic-wave-propagation/) - “Continuous development of numerical modeling methods in seismology is driven by emerging requirements in observational seismology, advances in the mathematical sciences, evolution of computer architectures and programming models, adaptation of methods originating in other scientific fields, as well as by practical applications including site-specific seismic hazard assessment. This session is a forum for presenting advances in numerical methodology, whether the principal context is observational, mathematical/numerical, computational or application-based. We invite contributions focused on development, verification and validation of numerical-modeling methods and methodologically important applications especially to earthquake ground motion, seismic noise and rupture dynamics, including applications from the field of induced seismicity with particular focus on multi-physics aspects, for example, combining fluid migration and stress transfer in porous media with rupture dynamics and wave propagation in poro-elastic media and integration of dynamic event modeling with simulation of the full seismic cycle. We encourage contributions on the analysis of methods, fast algorithms, high-performance implementations, large-scale simulations, non-linear behavior, multi-scale problems and confrontation of methods with data.”
- [Observations and the Physics Behind Complex Earthquakes](https://www.seismosoc.org/sessions/observations-and-the-physics-behind-complex-earthquakes/) - New observations of large earthquakes are challenging the simple model of a smoothly expanding rupture on a planar fault. Some recent events have involved multiple faults (e.g., 2012 M 8.6 Sumatra, 2016 M 7.8 Kaikoura, New Zealand), re-rupturing of a single fault patch (e.g., 2015 M 7.5 Hindu Kush), dynamic triggering of later sub-events (e.g., 1997 M 7.1 Harnai, Pakistan) and the interaction between intraplate and interplate faults (e.g., 2009 M 8.1 Samoa-Tonga, 2016 M 7.9 Papua New Guinea). Are these earthquakes outliers? Or does our increased ability to resolve a detailed picture capture a new norm? How can we define a new common behavior? What are the physical mechanisms that control the signatures of complex earthquakes? We welcome contributions on geodetic, seismic and field observations of complex earthquakes, new source inversion/imaging techniques, as well as physical analysis and simulation of complex earthquakes.
- [Observed Characteristics of Induced Seismicity: From Laboratory to Field Scale](https://www.seismosoc.org/sessions/observed-characteristics-of-induced-seismicity-from-laboratory-to-field-scale/) - A wide variety of methods have been employed to examine the physical mechanisms and site-specific conditions that control anthropogenically induced seismicity. Laboratory experiments and mesoscale experiments of fluid injection into active faults investigate the role of fluids and friction on fault stability and the contribution of aseismic slip to the nucleation process. Seismic array installations including large-N array deployments characterize the seismic wave-field, microseismicity and fault structure. Advanced earthquake detection and location techniques are being used to identify complex spatial and temporal migration patterns and statistical methods are used to differentiate between tectonic and induced events. Deployment of pressure monitoring networks explore the migration of fluids in the subsurface and illuminate how earthquakes modify the poroelastic environment. Geomechanical reservoir simulations relate fluid injection volumes/rates to subsurface fluid-pressure changes and numerical methods couple reservoir models to earthquake simulators to understand how induced seismicity sequences evolve due to changes in injection operations. These methods reveal that the character and evolution of induced seismicity are more complex than previously thought. We solicit contributions from laboratory/field experiments and observational, geomechanical and numerical modeling studies that explore the wide variety of characteristics, as well as the physical conditions and mechanisms, that control behavior of induced seismic sequences. In addition, we encourage contributions that discuss datasets and techniques needed to further understand and mitigate the risk associated with fluid injection.
- [Ocean Bottom Seismology - Hurdles, Strategies and Outcomes](https://www.seismosoc.org/sessions/ocean-bottom-seismology-hurdles-strategies-and-outcomes/) - The field of Ocean Bottom Seismology has been rapidly expanding, with many types of deployments for a wide variety of targets. Ocean floor sensors have been used for structural and geodynamic studies, enhanced seismic monitoring and improved source location. Different marine environments and tectonic settings require innovative solutions to deployment logistics, sensor emplacement and data recovery. Following the extraction of data, special problems relating to a sometimes very noisy environment pose new challenges to maximize data utility. We welcome contributions addressing all aspects of active and passive ocean-bottom seismology, technical innovations, data analysis and the scientific results obtained from OBS or amphibious projects.
- [Onshore Quaternary and Contemporary Tectonics: Implications for Seismic Hazards](https://www.seismosoc.org/sessions/onshore-quaternary-and-contemporary-tectonics-implications-for-seismic-hazards/) - We solicit abstracts that focus on work related to earthquake history of onshore faults, regional or site-specific tectonic deformation (e.g., changes in marine terrace elevations or in stream gradients), current crustal stress orientations and/or seismicity, that contribute to the understanding of the hazards posed by onshore faults in the Caribbean region. Papers could also include the use of the information available about the activity of onshore faults in the assessment of seismic hazards for structures of various types or information from offshore studies that implicate onshore faults.
- [Plate Boundary Segmentation and Coupled-to-Creeping Plate and Block Boundary Faults](https://www.seismosoc.org/sessions/plate-boundary-segmentation-and-coupled-to-creeping-plate-and-block-boundary-faults/) - This session aims to begin characterizing the range of fault behaviors on plate and block-boundary faults in the Caribbean and Latin American regions. Presentation of case studies that use seismological, geodetic, geological, geomorphic and other approaches to study individual locked, creeping and intermediate faults and segments are invited. We also seek out the presentation of work that uses both empirical evidence and modeling to understand the physical causes for these differing fault behaviors. A major goal of the session is to begin understanding how and why individual plate and block boundaries are segmented and how locked and creeping segments link in space and time.
- [Present-day Plate Boundary Deformation and Seismic Hazard in the Caribbean](https://www.seismosoc.org/sessions/present-day-plate-boundary-deformation-and-seismic-hazard-in-the-caribbean/) - Seismic hazard is an integral part of the Caribbean. Earthquakes can be particularly devastating to countries of the region that have seen a significant rise in population density — often with a concentration in coastal areas and substandard building practices. A number of research and observation programs are however underway with the goal of better understanding seismic hazard and the physical processes that control the occurrence of earthquakes in the Caribbean, with the potential to inform decisions and contribute to capacity building. This session aims at bringing together geoscientists with an interest in seismic hazard characterization and active plate-boundary deformation in the Caribbean through seismology, paleoseismology, geodesy, tectonics, geodynamics or any other relevant discipline.
- [Real-time GNSS Network Operations and Advances towards Early Warning Systems](https://www.seismosoc.org/sessions/real-time-gnss-network-operations-and-advances-towards-early-warning-systems/) - A fundamental aspect of Real-Time GNSS operations is the capability to obtain physical charactersitics of the rupture process after the onset of an earthquake. Of particular interest is the ability to use rupture parameters to assess the effects of strong ground motions and a potentially ensuing tsunami. This session seeks contributions of the latest approaches in using Real-Time GNSS data to be applied in source inversion algorithms and to produce seismic parameters in seconds to minutes after the occurrence of an earthquake. Contributions describing how such results are applied for shaking and tsunami intensity forecasts (i.e. for early warning systems) are highly welcome and desirable. The use of casters or other protocols to collect and distribute the data, the computer infrastructure required to manage data operations, correction schemes employed for precise point positioning, data manipulation, visualization of data and other steps carried out in the estimation of source parameters are likely contributions expected for this session. We also welcome contributions that discuss operational issues such as: what is required in the field to ensure highly reliable data flow, what can be done to maintain low-latency, high-rate data steams without overburdening communications, how can redundancy be built into data paths and how to leverage existing infrastructure in seismic networks to enable GNSS data flow and vice versa?
- [Recent Advances in Dense Array Seismology](https://www.seismosoc.org/sessions/recent-advances-in-dense-array-seismology/) - The availability of dense seismic arrays is desired to record well-sampled and unaliased wavefields. The recording of full wavefields combined with advanced data analysis techniques has the potential to image the subsurface and to study source characteristics with unprecedented resolution. The recent availability of low-cost and easy-to-deploy seismic sensors and emerging technologies such as Distributed Acoustic Sensors (DAS) have made it possible to deploy large and dense arrays in a reasonable time frame. Data acquired by such dense systems promote the development of many new data analysis methods that study seismic signals in a more comprehensive fashion. This session aims to compile innovative efforts that engage in recent advances in dense array seismology. We invite contributions from all research focus areas that are broadly related to dense arrays. Example topics include, but are not limited to, instrument development, field experiment with Large-N or DAS array, high-resolution imaging of subsurface structure, full wavefield reconstruction, environmental seismology and seismic source characterization.
- [Regional Seismic Network Approaches and Stakeholder Collaborations](https://www.seismosoc.org/sessions/regional-seismic-network-approaches-and-stakeholder-collaborations/) - “Seismic monitoring is a collaborative effort typically carried out by a broad array of state, university and federal partners. This distributed approach provides standardized earthquake analysis while adapting to the needs of specific regions and stakeholders. Many seismic networks in the U.S. coordinate through the Advanced National Seismic System. There are numerous organizations, both long-established and new, that operate independently. This is the case for most national networks within the Americas and other regions of the world. This session highlights the unique observations, opportunities and adaptations of so-called regional seismic networks. The purpose of the session is to foster collaboration and showcase specific regional success stories. We welcome a wide range of contributions spanning science, operations and/or stakeholder engagement and particularly encourage submissions based on lesser-known organizations. Examples include but are in no way limited to: response to major earthquakes, unique tectonic considerations, non-earthquake sources, industry applications, forensic seismology, detection and processing workflows, facilities monitoring, custom products and services and support for local stakeholders. The only prerequisites are (i) real-time data and (ii) adaptation to a regional need or phenomenon. If your hometown network does something you are proud of, this session is the place to show it off.”
- [Retrieval of Fine Scale Information Using Seismic Noise](https://www.seismosoc.org/sessions/retrieval-of-fine-scale-information-using-seismic-noise/) - The use of ambient noise and other passive sources, coupled with the advent of large-N deployments, has been applied to an exponentially increasing number experiments in the last decade. Parallel advances in numerical methods and a deeper understanding of the physics and statistics of these passive wavefields has led to a number of highly inventive methodological advances affecting both the spatial and temporal resolution of recovered structures. Namely, ambient noise body wave tomography, passive temporal monitoring of dynamically varying structure through dt/t measurements or other approaches, full waveform modeling of the ambient field and improved statistical models for diffusely scattered coda, have made substantial impacts in the way researchers now approach classically intractable problems. In this session, we seek to display such advances in the use of passive sources, either through seismic interferometry or other novel approaches, that result in the retrieval of fine scale information in new settings or the improvement of algorithms allowing for retrieval of more accurate physical parameters from previously tested datasets and media. Submissions are encouraged for research tackling current difficulties in resolution and physical parameter retrieval, as well as computational limitations and solutions to such problems.
- [Science Gateways and Computational Tools for Improving Earthquake Research](https://www.seismosoc.org/sessions/science-gateways-and-computational-tools-for-improving-earthquake-research/) - Science gateways allow research communities to access shared data, software, computing services, instruments, educational materials and other resources. Advances in earthquake science are becoming increasingly tied to the ability to fuse and model multiple data types, requiring advances in computational infrastructure. Earthquake scientists must rely on computational laboratories to integrate disparate data sets and perform simulation experiments, particularly because earthquake processes span multiple spatial and temporal scales, ranging from microscopic, millisecond source physics to long-term, global tectonic scales. This session focuses on advances in computational infrastructure and data synthesis for enhancing earthquake science, including software, supercomputing, simulation models, sensor technology, heterogeneous data sets, cloud computing, management of huge data volumes and development of community standards.
- [Seismic Event Screening](https://www.seismosoc.org/sessions/seismic-event-screening/) - One of the products from global seismic monitoring provisional to entry-into-force of the Comprehensive Nuclear-Test-Ban Treaty (CTBT) is a Standard Event Bulletin (SEB). The SEB contains event characterization parameters that can be used to screen-out seismic sources that are almost certainly not nuclear test explosions. During the two decades since the CTBT was opened for signature, research has resulted in a wide range of new source characterization methods. Based partly on results from this research, many seismic sources currently included in the SEB could be confidently identified as naturally occurring earthquakes. The new developments include, but are not limited to, comparison with empirical templates based on well calibrated past events, more precise depth constraint through simultaneous location of multiple events, ratios of spectral amplitudes of local and regional phases, ratios of different magnitudes computed from local, regional and teleseismic data, determination of moment tensor solutions from regional and teleseismic data and joint use of seismic and infrasonic data. This session comprises contributions related to evaluating which methods have advanced sufficiently to be ready for operational use in CTBT monitoring and what further research would be required to implement other methods in operations.
- [Seismic Hazards and Historic Earthquakes in Puerto Rico and the Northern Caribbean Region](https://www.seismosoc.org/sessions/seismic-hazards-and-historic-earthquakes-in-puerto-rico-and-the-northern-caribbean-region/) - The USGS seismic hazard assessment for Puerto Rico and the U.S. Virgin Islands was last updated in 2003. For this session, we solicit papers that discuss new developments in probabilistic seismic hazard analysis in PRVI and the broader Caribbean region, as well as studies of historical earthquakes that inform the modern hazard models. We invite researchers to present new results that are critical to seismic hazard modeling and evaluation, including ongoing efforts by GEM and the USGS. Seismic hazard evaluation requires: 1) high-quality earthquake catalogs; 2) fault slip rates; 3) earthquake recurrence models; 4) region-specific ground motion models; and 5) local site amplification models. We encourage presentations on novel and creative concepts that will contribute to advancing seismic hazard models in the region.
- [Seismic Structure of Convergent Plate Margins](https://www.seismosoc.org/sessions/seismic-structure-of-convergent-plate-margins/) - “Convergence between tectonic plates is accomodated in multiple ways, including subduction, large-scale transform motion and continent-continent collision. This convergence is manifested through the creation of volcanic arcs, orogenic plateau formation and high seismicity rates. As a result, lithospheric-scale reworking of the converging plates is common in these systems. The tectonics of convergent plate margins have been well studied. However, how convergence is manifested in the seismic structure of these regions is still debated due to the complexity of the regions and differences in datasets and methodology. This session aims to shed light on how the processes that accompany convergence are expressed in the lithospheric structure of the crust and upper mantle of these margins, in the context of the increased availability and coverage of seismic data and recent advances in seismic tomography and imaging techniques. Examples of convergent plate boundary systems include but are not limited to: the Mediterranean, Alpine-Himalayan, American Cordillera, Caribbean and western Pacific systems.”
- [Seismic Studies of Earth's Crust and Lithosphere](https://www.seismosoc.org/sessions/seismic-studies-of-earths-crust-and-lithosphere/) - Seismicity, seismic catalogs, and structure of earth’s crust and lithosphere are key components to understanding regional seismic risk and tectonics. The session includes studies of seismicity and imaging of Earth’s crust and lithosphere as well as advances in seismic catalogs recording local seismicity.
- [ShakeMap-Related Research, Development, Operations and Applications](https://www.seismosoc.org/sessions/shakemap-related-research-development-operations-and-applications/) - “ShakeMap Version 4 represents a major re-engineering of the entire ShakeMap software package, including the way ground-motion parameters are interpolated, both geospatially and as a function of frequency. The new multivariate-normal interpolation strategy naturally accommodates uncertain intensity as well as ground-motion parameters, along with the correlations between the different parameters. While this new software and capabilities add important new functionality, they require (among other gaps) additional R&D on ground motion and intensity models, duration/intensity models, model selection and spatial cross correlations. Thus, this session explores current research in the modeling and validation of ground motion and intensity relations as well as new or emerging efforts to improve ground motion prediction, site amplification and geospatial analyses (along with uncertainties) pertinent to ShakeMap. Presentations on new ShakeMap products, formats and web-rendering are also encouraged. A ShakeMap Workshop will be held on the Friday (May 18th) following the SSA meeting at the meeting venue. Workshop attendees are particularly encouraged to share their ShakeMap-related examples, research, operations and needs. We also encourage presentations on more general research, operations, or applications related to ShakeMap. Such applications include, but are not limited to: earthquake scenarios, risk assessment, loss estimation, earthquake response tools and engineering and other analyses that utilize ShakeMap ground motion estimates and associated uncertainty information.”
- [Structure and Dynamics of Earth’s Mantle](https://www.seismosoc.org/sessions/structure-and-dynamics-of-earths-mantle/) - Understanding the structure and dynamics of Earth’s mantle provides key insights into the fate of subducted slabs, the evolution of Earth, the dynamic forces that help drive large scale surface tectonics and core-mantle interactions amongst other topics of interest. Recent advancements in global seismic station coverage as well as advances in computational techniques have led to a current renaissance in studies of Earth’s interior. For example, recent P-coda scattering studies and waveform tomography have provided new insight into the distribution of mantle heterogeneity and axisymmetric 2.5D theoretical waveform modeling has provided insight into the influence of topography on waveforms on major boundaries including the transition zone and core-mantle boundary. This broad session invites submissions from observational or theoretical studies in seismology, geophysics and geodynamics exploring Earth’s mantle.
- [Structure and Geodynamics of the Caribbean Plate Boundaries](https://www.seismosoc.org/sessions/structure-and-geodynamics-of-the-caribbean-plate-boundaries/) - “The Caribbean plate (CAR) is unusual for a number of reasons. The region’s history includes numerous destructive large magnitude earthquakes and tsunamis. An intermediate sized plate (3.3×106 km2), CAR is surrounded on its north, east and south by the much larger American plates, but since much of CAR is an large igneous province (LIP), its buoyancy makes it difficult to subduct. As a consequence, it is girdled by inward directed subduction zones; the Antilles on the east, the Puerto Rico Trench in the northeast and the Central American Trench on the west. Further, the large El Pilar-San Sebastian strike-slip system along northeastern South America (SA) connects the southern Antilles trench to the Southern Caribbean Deformed Belt and a poorly defined subduction zone in northwestern SA, at which CAR subducts beneath northern Colombia and western Venezuela. The flat CAR subduction has created the Merida Andes, Perija and Santa Marta uplifts. Since the SA plate is subducting beneath CAR at the southern Antilles subduction zone and CAR is subducting southeastward beneath western SA, the two plates are subducting beneath one another. The number and volume of plates descending beneath CAR as imaged in different tomography studies (e.g., Bezada et al, JGR, 2010 and Van Benthem et al, JGR, 2013) create interesting space problems in the upper mantle beneath CAR and its neighbors, influencing upper mantle flow. In north and northwestern CAR a complex series of strike slip and oblique slip faults extend from Puerto Rico across and around Hispaniola to join with the strike slip faults of the Cayman trough. These include what may be incipient northward subduction of CAR along the Muertos trough south of Hispaniola and Puerto Rico. The plate boundaries around Panama are complicated and include what appears to be incipient CAR subduction just east of the Panama arc and the northeastern boundary of the recently identified Coiba and Malpelo plates (Zhang et al., GRL, 2017), bounded by the Panama arc, Cocos, Nazca and SA. This diversity of tectonic boundaries provides an unusually rich source for seismicity and tsunamigenic earthquakes. Regional seismicity and GPS velocities suggest that a number of small tectonic blocks, moving quasi-independently and deforming internally, are caught in the boundary zones between CAR and the surrounding plates. We invite contributions on any aspect of seismic structure, plate structure, deformation, seismicity and geodynamics in and around the Caribbean.”
- [Testing PSHA Input Data, Source Models and Hazard Estimates](https://www.seismosoc.org/sessions/testing-psha-input-data-source-models-and-hazard-estimates/) - “Many open, transparent probabilistic seismic hazard assessment (PSHA) models have become available, each involving many types of input data and assumptions. To inspire confidence, their input data, source models (i.e., earthquake forecasts) and hazard estimates require rigorous testing and validation. UCERF3, the most advanced and comprehensive earthquake forecast ever, serves as an important example of a PSHA source model. It uses earthquake history, geologic fault data, geodetic and geologic strain rates and many assumptions. It is used in the US National Seismic Hazard Maps and the Uniform Building Code. With 1440 logic tree branches in just the time-independent models, it calculates off-fault epicenter rate density and rates of about 250,000 fault rupture scenarios, offering targets to evaluate the internal consistency and influence of model parameters and data values. We welcome contributions to testing PSHA input data, including earthquake history, paleo-seismic event rates, geological and geodetic fault slip rates; strategies for integrating those data into source models; ground motion prediction equations; and resulting hazard estimates.”
- [The Future of Telemetered Seismic Arrays - Where the Operation of the Network Ends and the Science Begins](https://www.seismosoc.org/sessions/the-future-of-telemetered-seismic-arrays-where-the-operation-of-the-network-ends-and-the-science-begins/) - Seismic science generally starts with a quality waveform archive and a rich catalog of well located events with accurate magnitudes. This session will explore new and innovative ways of field operations and discuss input on more efficient approaches to delivering this scientific starting point. This could include cloud and network services, engineering services, improved instrumentation, co-located complimentary instruments and less expensive installations. An integrative approach to station building and management using many geophysical observations should become standard in most supported telemetered networks. Arrays of seismometer and geophysical instruments that address more use cases for less investment are the key going forward. We invite abstracts on a wide range of topics that affect the creation, management and type of geophysical stations built: early earthquake warning, public hazard reporting, environmental monitoring, science observatories, cost, performance, data use case, data latency, noise characteristics, regional concerns and the cost of data per gigabyte.
- [The Next Big Earthquake: The Usual and the Unusual Suspects](https://www.seismosoc.org/sessions/the-next-big-earthquake-the-usual-and-the-unusual-suspects/) - Recent large and great earthquakes have altered the terrain, economies and lives of people in Haiti, Chile, New Zealand, Nepal and Japan. The potential for future damaging earthquakes in these and other populated regions near tectonically active plate boundaries are well known and pose increasingly significant risk to societies there. But what observational evidence do we have to understand where next big earthquake will be? This session seeks paleoseismic and historical earthquake studies that examine large and great earthquakes around the world that pose such hazards. Analyses that include the number of people impacted, past and future effects on urban infrastructures or cultural systems and the size or level of ground deformation are of particular interest. Additionally, field investigation and analysis of recent surface-rupturing earthquakes and studies that examine the variability of past ruptures in size and time with a special emphasis on how such paleoseismic data can be used for seismic risk mitigation are welcome. Submissions from studies in Central and Latin America are particularly encouraged, as are studies of global fault networks.
- [The Recent Earthquakes that Shocked Mexico in September 2017](https://www.seismosoc.org/sessions/the-recent-earthquakes-that-shocked-mexico-in-september-2017/) - Last September, Mexico experienced two large earthquakes that seriously affected the south and central parts of the country. Both earthquakes were intraslab normal-faulting ruptures within the oceanic Cocos plate. The first one (Mw=8.1) occurred on September 8 in the Tehuantepec Gulf, collapsing thousands of small to medium size buildings in several provinces around the epicentral area. Numerous aftershock sequences (or triggered seismicity) followed the main earthquake increasing the damage to the Tehuantepec Isthmus. The second event (Mw=7.1) occurred eleven days later, on September 19, south of the border between the Morelos and Puebla States and close to important cities such as Cuernavaca and Mexico City (~100 km to the north of the epicenter), where hundreds of buildings collapsed or were seriously damaged. In total, the authorities estimate that about 400 people died nationwide as a consequence of both events. This session welcomes papers addressing various seismological aspects of both earthquakes, such as source modelling, aftershocks sequences, ground motion and tsunami modeling, strong motions, triggered seismicity and tectonic implications among others.
- [Tsunami Modeling and Hazard Assessment](https://www.seismosoc.org/sessions/tsunami-modeling-and-hazard-assessment/) - Many recent advances have been made in the fields of tsunami modeling and hazard assessment. For example, the U.S. National Tsunami Hazard Mitigation Program has sponsored benchmarking workshops on the numerical modeling of tsunami propagation and inundation, tsunami currents and tsunamigenic landslides. In addition, the study of tsunami hazard has evolved to include loss estimates and mitigation measures, and tsunami hazard analysis is scheduled to become part of the building codes in several states in the next few years. There has been an increase of capabilities for tsunami risk reduction for the Pacific, Caribbean and adjacent regions. We also seek contributions on how to address, in a consistent fashion, seismic source definition for seismic and tsunami hazard assessments. This session will provide a forum for all aspects of tsunami modeling and hazard assessment and also for studies of tsunamis with a non-megathrust source.
- [Tsunami Outreach, Education and Warning Dissemination: Cross-disciplinary Opportunities for Increasing Tsunami Resiliency](https://www.seismosoc.org/sessions/tsunami-outreach-education-and-warning-dissemination-cross-disciplinary-opportunities-for-increasing-tsunami-resiliency/) - Tsunami-vulnerable areas continue to grow as coastal development expands and more people reside in tsunami-at-risk areas. However, as time passes from the last major ocean-wide tsunami in 2011, the urgency for and attention on tsunami risk reduction has taken a back seat to more recent events such as hurricanes, wildland fires and earthquakes. This session provides a broad forum for tsunami outreach, education and warning studies and related mitigation efforts. We particularly invite contributions from researchers working across disciplines, including multi hazard frameworks, that involve solutions to evacuation and warning issues and have addressed how other more recent events such as hurricanes can be used to promote tsunami resilience and risk reduction.
- [U.S. National Seismic Hazard Model Updates: 2018, 2020 and Beyond](https://www.seismosoc.org/sessions/u-s-national-seismic-hazard-model-updates-2018-2020-and-beyond/) - The US Geological Survey (USGS) National Seismic Hazard Models (NSHMs) are a bridge for translating “best-available” earthquake science into public policy. Historically, the NSHM for the conterminous U.S. has been updated every six years. The 2018 update will be a four-year update. Compared to the six-year cycle, the 2018 update will have fewer changes, thereby distributing sensitivity testing that becomes difficult when numerous changes are considered at once. This session focuses on the 2018, 2020 and future updates to the conterminous U.S. model. The deadline for any suggested modifications or additions to be considered to the 2018 model has passed; during this session we will summarize the scientific improvements in the 2018 model and discuss the outcome of the USGS 2018 NSHM update workshop (March 2018) in California. Looking forward, the deadline for published research to be included into the 2020 model is quickly approaching (June 2018). For this session, we invite contributions in all topics and areas that will influence future hazard models, for example: NGA-East, NGA-Subduction, physics-based ground motion models (3D simulations) and source models (UCERF4), source model implementations, directivity methods, fault characterizations, scaling equations, site amplifications and catalogs, among others.
- [Uncertainty in Ground Motion Estimation; Seismological and Engineering Perspectives](https://www.seismosoc.org/sessions/uncertainty-in-ground-motion-estimation-seismological-and-engineering-perspectives/) - “Quantifying, understanding sources of, and reducing uncertainty in, methods of ground motion estimation are critical for improving seismic hazard assessment, as well as for working towards an understanding of the underlying seismological processes behind ground motion. Large uncertainty has often plagued estimates of physical parameters; it is important to reduce this uncertainty to discern the underlying seismological trends. Collaboration between the engineering and seismological communities is mutually beneficial. This session aims to bring together these communities to increase communication of new developments in targeting and understanding sources of uncertainty or variability in ground motion estimation, as well as working towards quantifying and reducing uncertainty for appications of seismic hazard assessment. We welcome studies focused on understanding the foundations of variability in the seismological processes or parameters affecting ground motion estimation (earthquake source parameters, source characterization, etc.), on improving crustal models and techniques for ground motion simulations, on methods of quantifying uncertainty in seismological processes, as well as on strategies for reducing aleatory uncertainty as represented in ground motion prediction equations and probabillistic seismic hazard analysis.”
- [Urban Liquefaction and Lateral Spread Investigations and Mapping](https://www.seismosoc.org/sessions/urban-liquefaction-and-lateral-spread-investigations-and-mapping/) - “Liquefaction and lateral spreading are major coseismic geohazards that have an especially large impact on lifelines, in particular when they occur in urban areas. A number of recent events (e.g. Christchurch, New Zealand and the recent 2017 Mexico City event) demonstrate that further geological and geotechnical investigations and models are required to better understand where liquefaction and lateral spreading will take place in order to avoid or design to mitigate these coseismic hazards. This session focuses on urban liquefaction and lateral spread investigations and mapping efforts to better understand occurrence and recurrence of this strong-ground motion derived geohazard. The field of liquefaction hazard mapping has advanced substantially since initial projects in the 1980s through 1990s established the practice. This session is focused on reviewing advances brought about by documentation of effects from earthquakes over the past few decades and ongoing advances and application of new technologies and analytical understanding. Specific topics of interest include integration of remote sensing exploration (lidar, satellite observations, etc) of recent liquefaction and laterals spreading, in addition to geological (trenching), geotechnical (CPT and drilling) and geophysical (e.g. shear wave, seismic reflection or refraction mapping, resistivity or radar) investigations to advance the predictive capabilities of hazard mapping. Also of interest are comparative studies between predictive hazard maps and actual occurrence of damaging liquefaction to assess the effectiveness of current mapping techniques.”
- [USGS Seismic Hazard User-Needs](https://www.seismosoc.org/sessions/usgs-seismic-hazard-user-needs/) - The US Geological Survey (USGS) National Seismic Hazard Modeling Project (NSHMP) invites our user community to present how they use the National Seismic Hazard Models and resulting products, such as hazard curves, ground motion maps, deaggregations, web services, computer codes, catalogs and source parameter data. Considering future updates in 2020 and beyond, and possibly including one-year forecasts for induced seismicity, the NSHMP would like to know more about how the user community uses its products and thereby how the models might need to be improved. In addition to changes to current products, we would also like to know what additional products would be helpful. Although the structural engineering community is the primary user of the National Seismic Hazard Models, many members of the SSA community consider the models and their components, in a broad array of research and industry applications, such as liquefaction and landslide stability studies and insurance risk assessments.
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