Meeting Abstracts

The Statewide California Earthquake Center (SCEC) collaborates with academic, government, industry, and other organizations to advance earthquake science, community resilience, and education by: (1) Gathering and analyzing data from field observations and laboratory experiments. (2) Developing system-level models and simulations of earthquake processes to synthesize knowledge as a physics-based understanding of seismic hazard. (3) Communicating that understanding to expand knowledge and reduce earthquake risk.

Participants are invited to present recent work aligned with SCEC priorities during the poster sessions.

Results 201-237 of 237

SCEC ID	Category	Title and Authors	SCEC Award
Group A Poster 079	CEM	Expanding UCVM with New Models, Methodologies, and Data Formats Mei-Hui Su, Scott Callaghan, Te-Yang Yeh, Yehuda Ben-Zion, Andreas Plesch, John Shaw, Scott Marshall, Ahmed Elbanna The Statewide California Earthquake Center (SCEC) Unified Community Velocity Model (UCVM) framework provides a standardized platform for accessing, integrating, and querying seismic velocity models for use in ground motion modeling and high-... more Themes: Advancing Community Earth Models for Hazard Analyses
Group B Poster 038	FARM	Generalization of Satellite-Based Building Damage Mapping Across Earthquake Events Yifan Sun, Lingsen Meng Rapid and accurate post-earthquake damage assessment is critical for emergency response. This study evaluates the spatial and cross-event generalizability of two complementary satellite-based paradigms: a physics-based Synthetic Aperture Radar (SAR... more Themes: Rapid Post-Earthquake Investigations & Communications
Group B Poster 028	FARM	Earthquake Cycle Simulations on Complex Three-Dimensional Fault Geometries Using Curved Boundary Elements Yudong Sun, Andrew Bradley, Paul Segall Earthquake cycle simulations have traditionally represented complex three-dimensional faults using tessellations of planar boundary elements, which introduce inaccuracies in stress calculations. We present a curved boundary element framework for... more Themes: Earthquake Cycle Simulations & Forecasting
Group A Poster 147	Seismology	Updates and Evaluations of the Southern California Regional Earthquake Catalog and Related Products Gabrielle Tepp, Ellen Yu, Aparna Bhaskaran, Ryan Tam, Shang-Lin Chen, Erika Jaski, Yijian Zhou, Ettore Biondi Since 1932, the Southern California Seismic Network (SCSN) has been maintaining a manually-reviewed earthquake catalog for Southern California as the regional earthquake authority. The catalog now contains over 1,000,000 seismic events. Recorded... more
Group B Poster 186	CCB	California’s Post-Earthquake Clearinghouse: A Place for Collaboration Kate Thomas, Brian Olson Did you know California establishes a Clearinghouse where scientists, engineers, and emergency managers coordinate after a major natural hazard event, and that you can be part of it? The California Geological Survey is mandated to stand up a... more Themes: Rapid Post-Earthquake Investigations & Communications
Group A Poster 115	Geology	Multi-Trace Rupture Behaviour of Reverse Faults: New Paleoseismic Insights from the Dunstan Fault, Otago, New Zealand Alex Travers, Mark Stirling, Kathleen Rodrigues, Jonathan Griffin, Dan Clark The Dunstan Fault is a slow slip rate reverse fault within the Otago Range and Basin Province, South Island, New Zealand. It is expressed at the surface by multiple parallel to sub-parallel traces spanning a ≤2.5km fault zone width. On the... more Themes: Earthquake Scenarios for Hazard and Risk Assessment \| Earthquake Cycle Simulations & Forecasting
Group A Poster 011	FARM	Gas compressibility suppresses injection induced fault rupture Dimitri Trifunac, Taeho Kim, Hamdi Tchelepi Fluid injection can activate faults by reducing the effective normal stress acting on the fault. Occurrences of microseismicity at the Decatur and In Salah carbon capture and sequestration (CCS) sites, and two recent magnitude 4 earthquakes in... more Themes: Earthquake Cycle Simulations & Forecasting
Group A Poster 087	CEM	Integrating Community Research into a Consensus Geodetic Model: A Community Velocity Field Exercise for the SCEC Community Geodetic Model (CGM) Ekaterina Tymofyeyeva, Michael Floyd, Kathryn Materna, Zhen Liu, Zheng-Kang Shen, Gareth Funning, Molly Zebker, Eric Fielding, Mradula Vashishtha, William Holt The SCEC Community Geodetic Model (CGM) is a unified representation of crustal deformation across California, integrating GNSS and InSAR observations to constrain interseismic strain accumulation, fault slip rates, and other deformation processes.... more Themes: Advancing Community Earth Models for Hazard Analyses
Group B Poster 078	CEM	Newly recognized active blind thrust faults in the northwest Los Angeles basin Gabrielle Ursin, John Shaw, Andreas Plesch Our research characterizes previously undocumented blind thrust faults in the northwestern Los Angeles basin that deform Pleistocene sediments and represent a potential unaddressed seismic hazard. Imbricate thrust faults pose some of the most... more Themes: Advancing Community Earth Models for Hazard Analyses \| Earthquake Scenarios for Hazard and Risk Assessment
Group A Poster 209	EFP	Modeling swarms as a random walk within a branching process Nicholas van der Elst Assessing the earthquake hazard during seismic swarms presents a unique challenge in operational forecasting. Whereas aftershock sequences follow a typical temporal decay pattern (Omori’s law) that allows for an estimate of the duration of the... more
Group A Poster 065	Geodesy	Depth-Dependent Crustal Deformation from a Physics-Based Joint Inversion of GNSS and InSAR in Southern California Mradula Vashishtha, William Holt, Jeonghyeop Kim Crustal strain transitions vertically from locked faulting in the brittle upper crust to distributed shear in the lower crust. Standard geodetic inversions simplify this 3D deformation field by assuming a uniform elastic thickness (H) to convert... more Themes: Advancing Community Earth Models for Hazard Analyses	25322, 24177
Group A Poster 139	Seismology	Probing nearby small earthquakes with the very dense FaultScan array John Vidale, Mingze Du, Quentin Higueret The Faultscan array [Higueret et al., SRL, 2026] consists of 300 stations in a 2 km square grid. Such dense recordings are increasingly feasible with nodal and DAS developments. Seismograms recorded on the surface are dominated by scattering in... more Themes: Earthquake Cycle Simulations & Forecasting	25253
Group B Poster 144	Seismology	Source Localization of the 1991–1992 Southern California "Mystery Booms" from the SCSN Triggered Archive, Tested Against Space Shuttle and SR-71 Overflights Robert Walker The pre-1999 SCSN triggered waveform archive contains an unexploited record of atmospheric acoustic sources. We revisit the 1991–1992 "mystery boom" series — recurring Thursday-morning sonic booms analyzed by Cates and Sturtevant (JASA 111... more Themes: Utilization of Ground Motion Simulations & Records
Group B Poster 022	FARM	Evolving seismic asperities by velocity- and temperature-dependent friction Binhao Wang, Sylvain Barbot Seismic asperities are widely treated as fault patches with fixed velocity-weakening friction, a material property frozen in time, implying a static separation between coseismic and aseismic slip. However, in nature the same fault regions can host... more Themes: Earthquake Cycle Simulations & Forecasting
Group A Poster 159	Seismology	Potential earthquake-triggered landslides near Palos Verdes and implications for near-field tsunami early warning Jingchuan Wang, Shane Zhang, Allen Husker Steep coastal topography and seafloor relief, inherently weak bedrock units, and seismic activity in the Southern California Borderland create favorable conditions for major landslides capable of generating local tsunamis. Active landslides along... more Themes: Earthquake Scenarios for Hazard and Risk Assessment \| Utilization of Ground Motion Simulations & Records \| Rapid Post-Earthquake Investigations & Communications
Group B Poster 004	FARM	Effect of Coseismic Stress Changes from the 1999 Chi-Chi and 2024 Hualien Earthquakes on the Ambient Stress Field Ruoyan Wang, Heidi Houston Large earthquakes can reorganize crustal stress fields, producing detectable changes in both stress orientation and, in some cases, absolute stress state. Here we extend analyses of coseismic stress rotations in Taiwan by combining stress tensor... more Themes: Earthquake Cycle Simulations & Forecasting
Group B Poster 036	FARM	Thermoelastic unclamping and pressure-driven fluid loss during multiyear circulation in enhanced geothermal systems Matthew Weingarten, David Dempsey Large-scale enhanced geothermal system (EGS) energy production is rapidly advancing through the use of multi-stage stimulation of horizontal wells. We analyze the first two years of continuous circulation at EGS Project Red, Nevada, drawing on... more Themes: Advancing Community Earth Models for Hazard Analyses \| Earthquake Cycle Simulations & Forecasting
Group B Poster 240	GM	Evaluating Variation in Rupture Directivity from Hypocenter Distributions in PSHA Kyle Withers, Morgan Moschetti, Jeff Bayless Rupture directivity models modify the median and variability of ground-motion models (GMMs) but alternatives remain for how to properly incorporate them into probabilistic seismic hazard analyses (PSHAs). Directivity model modifications depend on... more Themes: Earthquake Scenarios for Hazard and Risk Assessment
Group B Poster 140	Seismology	Feature Extraction from Seismic Waveforms for Earthquake-Explosion Discrimination Jeongung Woo, Alamgir Hosain, Nathan Maier, Ting Chen Accurate classification of seismic source types is an important task for seismic monitoring. While classical methods such as the P-to-S ratio provide a simple and general standard for discrimination, recent deep-learning methods can improve... more
Group B Poster 220	GM	Strong Ground Motions near La Guaira during the 2026 Venezuela Earthquake: Effects of Rupture Dynamics and Slip Heterogeneity Baoning Wu, David Sandwell, Rubi Garcia-Gonzalez, Jeremy Wing Ching Wong, Molly Zebker, Alice-Agnes Gabriel On June 24, 2026, an Mw7.5 earthquake occurred in northern Venezuela and caused catastrophic damage, with La Guaira among the most severely affected regions. We use 3D dynamic rupture simulations with linear slip-weakening friction to quantify how... more Themes: Earthquake Scenarios for Hazard and Risk Assessment \| Physics-Based Ground Motion Simulations & Validation \| Rapid Post-Earthquake Investigations & Communications
Group A Poster 025	FARM	A Simple Discrete Elastic Model Exhibits Both the Statistical Properties and Migration Patterns of Slow Slip Ling Xia, Allan Rubin 25 years after their discovery, the physical mechanisms of slow earthquakes remain enigmatic. Here we develop a simple quasi-static elastic model that reproduces both the migration patterns of elastic/frictional models, and the statistical... more
Group A Poster 229	GM	Earthquake Scenarios for California Via 3D Physics-based Ground Motion Simulations Ke Xu, Kim Olsen Earthquake scenarios can be useful for estimating the extent of damage and economic losses from future earthquakes and to prepare emergency response plans. Here, we have calculated physics-based simulations with ensembles of 10 source realizations... more Themes: Earthquake Scenarios for Hazard and Risk Assessment \| Physics-Based Ground Motion Simulations & Validation	24156
Group A Poster 157	Seismology	Multi-Data Rupture Imaging of the 2026 Northern Venezuela Mw 7.5 Earthquake: Strong Unilateral Propagation Along a Segmented Fault System Liuwei Xu, Yunjun Zhang, Hongrui Wang, Chen Ji, Cunren Liang, Zhongwen Zhan, Yuankun Xu The Boconó and San Sebastián faults are the major onshore and offshore components of the Caribbean–South America plate boundary, but their connectivity and roles in hosting large earthquakes remain poorly constrained due to the region’s complex... more Themes: Rapid Post-Earthquake Investigations & Communications
Group A Poster 075	CEM	Multi-scale Statewide California Seismic Velocity Models: Version 1 Te-Yang Yeh, Yehuda Ben-Zion, Kim Olsen A high-quality multi-scale description of subsurface seismic velocities is foundational for a range of topics including advancing simulations of ground motion and consistent derivation of earthquake source parameters. In this study, we construct... more Themes: Advancing Community Earth Models for Hazard Analyses \| Physics-Based Ground Motion Simulations & Validation
Group A Poster 163	Seismology	12 years (2013-2025) of relocated earthquakes and focal mechanisms at Lake Almanor, Northern California, reveals a connection at depth between larger mapped surface faults Clara Yoon, Robert Skoumal, Jeanne Hardebeck, Katherine Guns, Rufus Catchings, Mark Goldman, Joanne Chan, Robert Sickler Lake Almanor, located in a region of transtensional deformation in northeastern California, experienced two moderate-magnitude earthquake sequences a decade apart. The 11 May 2023 Mw 5.5 Lake Almanor earthquake was followed ~11 hours later by an Mw... more Themes: Earthquake Scenarios for Hazard and Risk Assessment \| Rapid Post-Earthquake Investigations & Communications
Group B Poster 230	GM	Seismic Site Response of Lunar Regolith: One-Dimensional Equivalent Linear Analysis of Apollo Landing Sites Elizabeth Yoseph, Rashid Shams, Chukwuebuka Nweke Understanding how near-surface lunar regolith modifies seismic ground motion is critical for the structural design of long-duration habitats, precision instrument deployment, and landing-site selection under Artemis and future lunar surface missions... more Themes: Physics-Based Ground Motion Simulations & Validation \| Utilization of Ground Motion Simulations & Records
Talk	Geodesy	Better Earthquake Imaging Through NISAR Molly Zebker The NASA-ISRO Synthetic Aperture Radar (NISAR) mission launched in July 2025 and is now distributing high resolution InSAR data globally. NISAR collects new acquisitions over all land and ice-covered surfaces every 12 days. NISAR’s L-band radar... more Themes: Advancing Community Earth Models for Hazard Analyses \| Rapid Post-Earthquake Investigations & Communications
Group A Poster 061	Geodesy	A GNSS-Derived Strain Rate Map of North America and Implications for Continental Yuehua Zeng This study presents a geodetic strain-rate model for the North American Continent derived from Global Navigation Satellite System (GNSS) velocity measurements. The model incorporates horizontal GNSS velocities compiled by Zeng (2022) for the western... more Themes: Advancing Community Earth Models for Hazard Analyses \| Earthquake Cycle Simulations & Forecasting
Group A Poster 161	Seismology	Hidden structural linkages redefine the seismic hazard of the Garlock fault Hao Zhang, Huiyun Guo, Matthew Salinas, James Dolan, Zhongwen Zhan The extent to which dynamic earthquake ruptures propagate through structural discontinuities on faults is a fundamental determinant of earthquake magnitude and the related seismic hazard. While empirical criteria often rely on fault surface geometry... more Themes: Advancing Community Earth Models for Hazard Analyses \| Earthquake Scenarios for Hazard and Risk Assessment
Group A Poster 201	EFP	The Collaboratory for the Study of Earthquake Predictability in China: Experiment Design and Preliminary Results of CSEP2.0 Shengfeng Zhang In earlier CSEP1.0 experiments in China, the PI model was used for alarm-based, intermediate-to-long-term forecasts of earthquakes with magnitude MS ≥ 6.0 in the Yunnan–Sichuan region (Zhang et al., 2016). That study adopted a magnitude cutoff of 3.... more Themes: Advancing Community Earth Models for Hazard Analyses \| Earthquake Scenarios for Hazard and Risk Assessment
Group A Poster 167	Seismology	Symmetric Nearest-Neighbor Analysis for Improved Earthquake Sequence Identification Siyuan Zhang, Heidi Houston Spatiotemporal earthquake interaction is one of the most widely studied characteristics of seismicity, reflecting fundamental aspects of earthquake physics, such as nucleation mechanisms, stress transfer, and deformation modes. These interactions... more Themes: Advancing Community Earth Models for Hazard Analyses
Group A Poster 019	FARM	Adjoint-based inversion for stress and frictional parameters in 3D dynamic earthquake rupture models Wenqiang Zhang, Eric Dunham Earthquake rupture processes (nucleation, propagation, and arrest) and the stress and frictional conditions that control them are fundamental to seismic and tsunami hazard assessment. Kinematic source inversions recover the space-time evolution of... more Themes: Earthquake Scenarios for Hazard and Risk Assessment \| Physics-Based Ground Motion Simulations & Validation \| Utilization of Ground Motion Simulations & Records	25156
Group B Poster 210	RC	Advancing Physics-Based Ground-Motion Simulations with GPU-Accelerated Hercules Wenyang Zhang Physics-based ground-motion simulations at frequencies relevant to engineering applications require very large meshes and many thousands of timesteps, making computational cost a major barrier to regional simulation ensembles and model validation.... more Themes: Physics-Based Ground Motion Simulations & Validation
Group A Poster 203	EFP	Operation and Prospect of China CSEP Test Center Yongxian Zhang, Shengfeng Zhang, Huaizhong Yu, Yue Liu, Weixi Tian, Xiaotao Zhang, Zhengyi Yuan, Guiping Liu In the end of 2019, a China-US cooperation project named “CSEP China in the Context of China Seismic Experimental Site (CSEP-CSES)” was approved which is led by Prof. Yongxian Zhang at the Institute of Earthquake Forecasting (IEF), China Earthquake... more Themes: Earthquake Cycle Simulations & Forecasting \| Rapid Post-Earthquake Investigations & Communications \| Engaging Communities in Earthquake Preparedness
Group A Poster 225	GM	Dynamic Rupture Simulations and 0-1 Hz Ground Motions of Two Leading Candidate Models for ShakeOut Scenario 2.0 Chunhui Zhao, Ahmed Elbanna, Kristen Chiama The southern San Andreas Fault has not hosted a major rupture in over 300 years and is widely regarded as capable of a magnitude ~7.8 earthquake. Anticipating how such an event would nucleate, propagate, and shake the Los Angeles region is central... more Themes: Earthquake Scenarios for Hazard and Risk Assessment \| Physics-Based Ground Motion Simulations & Validation \| Engaging Communities in Earthquake Preparedness	26067
Group A Poster 149	Seismology	Toward an AI-Enhanced Near-Real-Time Earthquake Cataloging System for the Southern California Seismic Network Yijian Zhou, Ryan Tam, Gabrielle Tepp, Rayomand Bhadha, Ellen Yu, Zachary Ross, Zhongwen Zhan, Allen Husker Rapid and complete microseismicity monitoring is increasingly important as modern seismic networks evolve, supporting scientific investigations, hazard assessment, and timely situational awareness following significant earthquakes. Although recent... more Themes: Advancing Community Earth Models for Hazard Analyses
Group A Poster 119	Geology	Preservation and interpretation of the geomorphic record of earthquakes Malinda Zuckerman, Alba Rodriguez Padilla, Chelsea Scott, Ramon Arrowsmith Surface-rupturing earthquakes leave a geomorphic record that serves as the foundation for fault mapping and probabilistic fault displacement hazard analyses. Over time, the record degrades as surface processes modify fault-related landforms. Both... more

The Statewide California Earthquake Center is committed to providing a safe, productive, and welcoming environment for all participants. We take pride in fostering a diverse and inclusive SCEC community, and therefore expect all participants to abide by the SCEC Activities Code of Conduct.

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