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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.
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| SCEC ID | Category | Title and Authors | SCEC Award |
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Group A Poster 127 |
FARM |
A rock-centric framework for rupture dynamics and its applications in Southern California
Binhao Wang, Mingqi Liu, Baoning Wu, Sezim Guvercin, Lei Zhang, Zekang Yang, Caroline Seyler, John Platt, Sylvain Barbot The frictional properties of rocks embedded in fault zones critically influence earthquake nucleation and rupture propagation. Despite detailed knowledge of regional geology and accumulating laboratory constraints on rock friction, we still lack a... more Themes: Developing Rheologies and Bridging Multi-Scales | Advanced Modeling Frameworks |
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Group B |
FARM |
Poroelastic Control of Shear Localization in Fluid-Saturated Fault Zones
Yuhan Wang, Elias Heimisson Shear localization in fault zones, where deformation is confined to millimeter-scale shear zones, exerts a key influence on earthquake nucleation and rupture processes. We develop a hybrid computational framework that couples the spectral boundary... more Themes: Developing Rheologies and Bridging Multi-Scales | Advanced Modeling Frameworks |
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Group B |
Geology |
From Coalinga to the Tehachapi Mountains: Recent activity and earthquake potential of blind fault systems in the Southern San Joaquin Valley
Robert Welch, Chris Anthonissen, Andreas Plesch, Lluis Salo-Salgado, James Dolan, John Shaw Since August 2024, the Southern San Joaquin Valley has experienced a series of small to moderate magnitude earthquakes on faults within the CFM, as well as systems that are not yet represented in the model. In particular, blind faults in two regions... more Themes: Improving Observations and Closing Data Gaps | Advanced Modeling Frameworks |
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Group B Poster 208 |
EFP |
Benchmarking and Adapting Neural Point Processes for Operational Earthquake Forecasting in California and China
Maximilian Werner, Sam Stockman, Weixi Tian, Yongxian Zhang Recent advances in machine learning have produced Neural Point Processes (NPPs) with the potential to improve earthquake forecasting over classical statistical models such as the Epidemic-Type Aftershock Sequence (ETAS) model. EarthquakeNPP is a... more Themes: Improving Predictive Analyses of Seismicity | Research Computing & Cyberinfrastructure |
24199
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Group A Poster 301 |
CCB |
Center for Land-Surface Hazards (CLaSH): What it is, what we’ve been doing, and opportunities for engagement with the SCEC community
Josh West, Marin Clark, Dimitrios Zekkos, Josh Roering, Brian Yanites Hazard cascades involve sequences of events in which one geohazard — like an earthquake — triggers others, like landslides, and those in turn can propagate to further hazards, such as fluvial aggradation and flooding. With cumulative impacts that... more Themes: Applied Science Implementation | Outreach and Community Engagement |
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Group B Poster 232 |
GM |
Spatial Variability of Ground Motions due to Rupture Directivity in Seismic Hazard Assessments
Kyle Withers, Morgan Moschetti, Jeff Bayless Rupture directivity produces systematic variations in ground motions from the interaction between rupture propagation and the seismic radiation pattern. It can cause significant azimuthal variation in near-fault ground motions at a given source-to-... more Themes: Advanced Modeling Frameworks |
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Group B Poster 154 |
FARM |
Reconciling Variability in Finite-Fault Models through Ensemble Dynamic Rupture Simulations: the Role of Stress Heterogeneity in the Tohoku-Oki Earthquake
Jeremy Wing Ching Wong, Alice-Agnes Gabriel, Wenyuan Fan Finite-fault models provide detailed imaging of the spatio-temporal evolution of earthquakes, however, large variability among these slip models limits understanding of underlying dynamic rupture processes. The 2011 Mw 9.0 Tohoku-Oki earthquake, one... more Themes: Improving Observations and Closing Data Gaps | Advanced Modeling Frameworks | Research Computing & Cyberinfrastructure |
25259, 25341
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Group B |
SDOT |
Testing the Role of Plasticity on the Frictional Strength of Calcite Gouge with Increasing Normal Stress
Sophia Wright Understanding the microphysics of fault friction has implications for scaling laboratory measurements of frictional strength and stability to spatial and temporal scales relevant to tectonic movement. Fault gouge can deform by fracturing, granular... more Themes: Improving Observations and Closing Data Gaps | Developing Rheologies and Bridging Multi-Scales |
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Group B |
GM |
An equivalent linear approach to material nonlinearity in regional simulations on a reduced domain
Feiruo Xia, David McCallen, Arben Pitarka EQSIM is a multidisciplinary framework for fault-to-structure earthquake simulations that was developed
as part of the DOE’s Exascale Computing Project (ECP). At the heart of EQSIM is the fourth order accurate finite difference code SW4 (Seismic... more Themes: Advanced Modeling Frameworks | Research Computing & Cyberinfrastructure |
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Group A |
GM |
Improved Scenario ShakeMaps Using 3D Physics-based Ground Motion Simulations
Ke Xu, Kim Olsen The US Geological Survey ShakeMap tool for rapid characterization of the extent and distribution of strong ground shaking following significant earthquakes worldwide has the option to generate maps for scenario earthquakes to anticipate seismic... more Themes: Advanced Modeling Frameworks | Improving Predictive Analyses of Seismicity |
24156
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Group A Poster 001 |
Seismology |
Bimaterial Effect and Favorable Energy Ratio Enable Supershear Rupture in the 2025 Myanmar Quake
Liuwei Xu, Lingsen Meng, Zhang Yunjun, Yidi Wang, Yanchen Yang, Changyang Hu, Huihui Weng, Wenbin Xu, Elizabeth Su, Chen Ji At 12:51 p.m. local time on March 28, 2025, a magnitude 7.7 earthquake struck near Mandalay, Myanmar. To resolve the rupture process of this major strike-slip event, we applied finite fault inversion and Back-Projection to seismic and geodetic... more Themes: Improving Observations and Closing Data Gaps |
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Group B |
FARM |
The Role of Normal Stress and Shear Stress Heterogeneity in the Inferred Depth-Independence of Stress Drop
Minghan Yang, Valere Lambert, Emily Brodsky Earthquake stress drops are inferred to be independent of their source depth, contradicting standard linear scaling predictions for frictional stick-slip models of earthquakes, assuming increasing fault normal stress due to rock overburden. Here, we... more Themes: Improving Observations and Closing Data Gaps | Developing Rheologies and Bridging Multi-Scales |
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Group B |
CEM |
Toward a validated multi-scale seismic velocity model for the San Andreas fault system in the Western US
Te-Yang Yeh, Yehuda Ben-Zion We present a workflow for developing and validating a multi-scale seismic velocity model for the San Andreas fault system in the Western US and initial results with multi-scale models for central and southern California. The research aims to... more Themes: Applied Science Implementation | Research Computing & Cyberinfrastructure |
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Group B Poster 246 |
GM |
State of knowledge and practice on single-station microtremor horizontal-to-vertical spectral ratio (mHVSR) analysis for seismic site response
Alan Yong The resonant frequencies (fp) produced by unconsolidated sediments overlying high velocity bedrock are often used as the basis for estimating the seismic site response function. The lowest fp in the spectrum is distinguished as the site resonance (... more Themes: Improving Observations and Closing Data Gaps | Applied Science Implementation |
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Group A Poster 025 |
Seismology |
Fault geometry from 12 years of relocated earthquakes (2013-2025) near Lake Almanor, Northern California, aided by a nodal deployment
Clara Yoon, Robert Skoumal, Jeanne Hardebeck, Rufus Catchings, Mark Goldman, Joanne Chan, Robert Sickler The 2023-05-11 Mw 5.5 Lake Almanor earthquake, and a Mw 5.2 aftershock ~11 hours later, ruptured normal faults in a sparsely instrumented region in Northern California, with only one strong-motion seismic station within 10 km and two broadband... more Themes: Improving Observations and Closing Data Gaps |
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Group B Poster 152 |
FARM |
The 2016 Mw 7.8 Kaikōura, New Zealand, Earthquake Triggers Slow Slip Events and Delays Megathrust Earthquakes in Rate-and-State Friction Simulations of the Hikurangi Subduction Zone
Jeena Yun, Jeremy Wing Ching Wong, Yuri Fialko, Alice-Agnes Gabriel, Dave May, Laura Wallace, Charles Williams The 2016 Mw 7.8 Kaikōura earthquake triggered slow slip events (SSEs) along the nearby Hikurangi subduction zone (HSZ), which is characterized by quasi-periodic SSEs spanning the entire margin. While large earthquakes have been observed to... more Themes: Advanced Modeling Frameworks | Improving Predictive Analyses of Seismicity |
25259, 25313
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Group A |
Geology |
California Quaternary Fault Database Update
Judith Zachariasen, Rob Wurgler, Meerea Kang The California Geological Survey (CGS) is updating the California Quaternary Fault Database (CQFD), revising it from the most current 2017 version. A broad range of end users in the academic, government, and consulting sectors use this database for... more Themes: Applied Science Implementation | Outreach and Community Engagement |
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Group B Poster 100 |
SDOT |
Stress Changes on the San Andreas Fault due to Groundwater Fluctuations in the Central Valley
Molly Zebker, David Sandwell, Adrian Borsa, Yehuda Bock Several studies have proposed that lithospheric unloading of the Central Valley due to extensive groundwater withdrawal over the past 150 years causes a rebound of the lithosphere that can be observed in GNSS and InSAR data [Amos et al., 2014;... more Themes: Improving Observations and Closing Data Gaps |
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Group B Poster 228 |
GM |
Reducing Apparent Variability and Uncertainty and Improving Ergodic and Non-ergodic Ground Motion Forecasts Using Physics-based Data
Yuehua Zeng, Mark Petersen, Norman Abrahamson, Chih-Hsuan Sung, Oliver Boyd, Arthur Rodgers We present a study to reduce large variability and uncertainty in the U.S. National Seismic Hazard Model (NSHM) by integrating physics-based data into the characterization of ground-motion models (GMMs). The approach involves: (1) partitioning the... more Themes: Advanced Modeling Frameworks |
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Group B Poster 218 |
GM |
Site-Specific Ground Motion Simulations via Spectral-Scaling Transfer Function Method
Esra Zengin, Monica Kohler, Thomas Heaton, Becky Roh This study presents a spectral scaling method for simulating site-specific ground motions for larger-magnitude earthquakes by transforming the Fourier amplitude spectra (FAS) of smaller events within the same source region. The method builds on Aki’... more Themes: Improving Observations and Closing Data Gaps | Applied Science Implementation |
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Group B Poster 142 |
FARM |
The generation of large and small earthquakes due to weak fault zone deformation
Peng Zhai, Yihe Huang, Jean-Paul Ampuero Major faults can produce both large and small earthquakes. The variation in earthquake sizes is commonly linked to heterogeneities on the fault itself such as seismogenic asperities and rupture barriers that influence the ultimate size of an... more Themes: Developing Rheologies and Bridging Multi-Scales | Advanced Modeling Frameworks | Improving Predictive Analyses of Seismicity |
25274
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Group B Poster 032 |
Seismology |
Deployment of a nodal array to capture two earthquake clusters near Malibu, California
Hao Zhang, Elizabeth Cochran, Xiaozhuo Wei, Zhongwen Zhan From 2024 to 2025, two active earthquake clusters separated by less than 10 km occurred near Malibu, California. The western earthquake cluster started on February 9th, 2024, with a M4.6 earthquake. The event’s moment tensor indicted an East-West... more Themes: Improving Observations and Closing Data Gaps | Improving Predictive Analyses of Seismicity |
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Group B |
Seismology |
An Enhanced Earthquake Catalog for the 2020 Monte Cristo Range Sequence Derived from Machine Learning Processing of a Dense Aftershock Deployment
Maia Zhang, Daniel Trugman, Michelle Scalise, Eric Eckert, Cleat Zeiler High resolution, near-source data can provide crucial information about earthquake processes, including enhanced detection of small earthquakes and improved source characterization due to minimal path attenuation. The Nevada National Security Site (... more Themes: Improving Observations and Closing Data Gaps |
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Group A Poster 007 |
Seismology |
On the origin of seismic signals from concerts and its potential use to monitor stadium health
Shane Zhang, Huiyun Guo, Abellaine Murti, Parisa Vazira, Flora Lo, Jacob Chow, Ariel Raymond, Qiushi Zhai, Igor Stubailo, Gabrielle Tepp, Monica Kohler, Zhongwen Zhan Fans’ movement and music from concerts can generate seismic waves, but the exact mechanism and the role of the stadium remain unclear. The Weeknd concert series at SoFi stadium in June 2025 set the record of most sold-out shows and thus provides a... more Themes: Improving Observations and Closing Data Gaps | Education and Workforce Development | Outreach and Community Engagement |
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Group A Poster 009 |
Seismology |
Favorable tidal stress triggers more tremors with higher energies
Siyuan Zhang, Heidi Houston, Shuye Huang, Binhao Wang Tidal stress has been proposed to modulate the occurrence of tremors, low-frequency earthquakes, and even regular earthquakes in certain tectonic settings. Precisely computed tidal loading offers a unique window into earthquake physics. Variations... more Themes: Improving Observations and Closing Data Gaps | Improving Predictive Analyses of Seismicity |
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Group B |
FARM |
3D dynamic rupture modeling with depth-dependent stress using nonlocal continuum damage breakage rheology
Chunhui Zhao, Ahmed Elbanna, Yehuda Ben-Zion Understanding the interplay of earthquakes and off-fault damage is crucial for understanding earthquake processes and linking surface observations to deformations at depth addressing. While numerical earthquake models are indispensable for bridging... more Themes: Developing Rheologies and Bridging Multi-Scales | Advanced Modeling Frameworks | Applied Science Implementation |
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Group A Poster 063 |
Geodesy |
How Can Fault Slip Inversions Be Reliable? Insights from Bayesian Analysis of the 2019 Ridgecrest Earthquakes and Afterslip
Xiong Zhao, Junle Jiang Regularization of model parameters is frequently employed to mitigate the ill-posedness of optimization-based fault slip inversion. The Bayesian approach can reveal the full posterior model space without ad hoc regularization, albeit at a higher... more Themes: Advanced Modeling Frameworks | Improving Predictive Analyses of Seismicity | Research Computing & Cyberinfrastructure |
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Group B Poster 038 |
Seismology |
Spatiotemporal Clustering and Migration of Seismicity in the Delaware Basin: Insights into the Causal Mechanisms of Induced Basement Earthquakes
Yijian Zhou, Krittanon Sirorattanakul, Zijun Fang, Jaewoo An, Jeff Nunn, Jean-Philippe Avouac The Delaware basin, located in west Texas and southwest New Mexico, is one of the most productive shale basins in the U.S. since 2010. Induced seismicity surged after 2014, including 6 M > 5 since 2010, with the most recent one occurring in 2025/... more Themes: Improving Observations and Closing Data Gaps | Improving Predictive Analyses of Seismicity |
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Group B Poster 054 |
Seismology |
Ambient Noise Full Waveform Inversion with Neural Operators
Caifeng Zou, Zachary Ross, Robert Clayton, Fan-Chi Lin, Kamyar Azizzadenesheli Numerical simulations of seismic wave propagation are crucial for investigating velocity structures and improving seismic hazard assessment. However, standard methods such as finite difference or finite element are computationally expensive. Recent... more Themes: Improving Observations and Closing Data Gaps | Advanced Modeling Frameworks | Applied Science Implementation |
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Group A |
Geology |
Geomorphic evidence of earthquakes: linking mapper accuracy, landform degradation, and fragile geologic features
Malinda Zuckerman, Ramon Arrowsmith, Chelsea Scott, Alba Rodriguez Padilla, Christopher Madugo, Albert Kottke Accurate assessment of earthquake ground motion and fault displacement hazard requires recognizing and interpreting geomorphic evidence of past earthquakes. We examine three factors that can affect the reliability and utility of tectonic landforms... more Themes: Improving Observations and Closing Data Gaps |
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Group B Poster 056 |
Seismology |
3D Least-Squares Migration of Teleseismic Receiver Functions and Its Application
Pengfei Zuo, Yunfeng Chen The development of dense seismic arrays offers new opportunities to develop advanced array imaging techniques for improving subsurface characterization. We present a high-resolution receiver function imaging method implemented through a three-... more Themes: Improving Observations and Closing Data Gaps |
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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.
