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 1-50 of 124

SCEC ID	Category	Title and Authors	SCEC Award
Poster	EFP	Enhanced Detection of P-wave onset: A Novel Algorithm for Accurate P-Wave Picking Sandeep . Globally, Earthquake Early Warning (EEW) system function as a national disaster mitigation technique for seismically active countries. Accuracy in P-wave picking being one of the major hurdles in EEW system for providing timely alerts in different... more Themes: Improving Predictive Analyses of Seismicity
Poster	GM	Assessing consistency of ground-motion models with recorded data – a case study from Puerto Rico and the U.S. Virgin Islands Brad Aagaard, Morgan Moschetti, Kyle Withers For the U.S. Geological Survey (USGS) National Seismic Hazard Model, we require a suite of ground-motion models that span the geographic extent of the National Seismic Hazard Model, which includes 50 states and five territories. In each region, we... more Themes: Improving Observations and Closing Data Gaps \| Applied Science Implementation
Poster	GM	Ground motion characteristics of idealized supershear ruptures: Do they matter for engineering applications? Mohamed Abdelmeguid, Grigorios Lavrentiadis, Ares Rosakis, Domniki Asimaki We study ground motion characteristics of supershear earthquake ruptures, where the rupture velocity exceeds the shear wave speed. Using dynamic rupture simulations, we compare supershear and subshear ruptures to identify similarities and... more Themes: Improving Observations and Closing Data Gaps \| Advanced Modeling Frameworks
Poster	Geodesy	The 2025 Mw7.7 Mandalay, Myanmar, earthquake: extremely long and uniform rupture part of a fault supercycle Solène Antoine, Rajani Shrestha, Chris Milliner, Kyungjae Im, Chris Rollins, Kang Wang, Kejie Chen, Jean-Philippe Avouac Large earthquakes often occur on faults that were known to have produced destructive events in the past. The 2025 Mw7.7 Mandalay earthquake is no exception as it ruptured a known seismicity gap along the Sagaing fault. Remote sensing observations of... more Themes: Improving Observations and Closing Data Gaps \| Advanced Modeling Frameworks \| Improving Predictive Analyses of Seismicity	25232
Poster	GM	Distance-dependent spatial correlation modeling of within-event ground-motion residuals using a graph-based generative approach Tariq Anwar Aquib, Paul Mai Accurate simulation of spatially distributed ground motions is essential for regional seismic risk assessment of spatially distributed infrastructure. While site specific ground-motion models predict shaking intensity at individual locations, they... more Themes: Advanced Modeling Frameworks \| Improving Predictive Analyses of Seismicity \| Research Computing & Cyberinfrastructure
Poster	FARM	The interplay between fault fabric and frictional healing in altered serpentinite-rich fault gouge Emma Armstrong, Monica Barbery, Alexis Ault, Greg Hirth, Srisharan Shreedharan, Ainsley MacDonald Creep or aseismic deformation influences earthquake behavior and modulates stress on faults. Fault creep may be controlled by frictional properties such as healing and/or fabric development. In the brittle portion of fault zones, fabric develops by... more Themes: Developing Rheologies and Bridging Multi-Scales	24119
Poster	GM	Modeling Nonergodic Ground Motions using a Graph Neural Network Eduardo Arzabala, Kyle Withers, Morgan Moschetti, Tim Clements, Ian McBrearty We use a deep learning approach, specifically Graph Neural Networks (GNNs), to develop a non-ergodic ground-motion model (GMM) from CyberShake. Unlike ergodic GMMs, non-ergodic GMMs require region-specific data or simulations for calibration. We use... more Themes: Advanced Modeling Frameworks
Talk	FARM	Do fault material properties and rheology govern shallow slip behavior in strike-slip fault systems? Alexis Ault What governs whether a fault creeps, produces slow slip events, or ruptures catastrophically? Modern geodetic and geophysical methods now capture on- and off-fault deformation throughout the earthquake cycle in unprecedented spatiotemporal detail.... more Themes: Improving Observations and Closing Data Gaps \| Developing Rheologies and Bridging Multi-Scales	24119, 23081, 22082
Poster	FARM	Linking near-surface material behavior to strike-slip surface rupture patterns and shear zone width with discrete element modeling Curtis Baden, Josie Nevitt, Fernando Garcia Surface-rupturing strike-slip earthquakes often produce complex deformation zones that host through-going shear bands, echelon fractures, and extensional or contractional structures near the fault trace. These inelastic features influence the... more Themes: Developing Rheologies and Bridging Multi-Scales \| Advanced Modeling Frameworks
Poster	Seismology	Variability and reliability of stress drops from the SCEC/USGS Community Stress Drop Validation Project Annemarie Baltay, Rachel Abercrombie The international USGS/SCEC Community Stress Drop Validation Study provides insight on the variability and reliability of spectral stress drop estimates which should be considered in application and interpretation of earthquake stress drop estimates... more Themes: Improving Observations and Closing Data Gaps \| Education and Workforce Development	25134, 24067, 23108, 23107, 22101, 22042
Poster	FARM	Frictional behavior of partially water-saturated phyllosilicate-bearing gouge of mixed composition Sylvain Barbot Phyllosilicates form an important group of silicate minerals characterized by a polymeric layered structure that results in unique hydro-mechanical properties. These sheet silicates exhibit distinct frictional behaviors in dry versus water-saturated... more Themes: Developing Rheologies and Bridging Multi-Scales
Talk	RC	Toward Trustworthy AI for Earth Science: Lessons from Climate Modeling and a Vision for Earthquake Science Karianne Bergen Machine learning (ML) is reshaping Earth science, offering new ways to extract information from data and simulate complex physical systems. In earthquake science, ML has significantly enhanced our ability to build high-resolution seismic catalogs... more Themes: Research Computing & Cyberinfrastructure
Poster	RC	New Seismic Hazard Research Capabilities and Software Improvements in OpenSHA v25.4 Akash Bhatthal Over the past year, our research collaboration, including SCEC and USGS scientists and software developers, has made significant progress in enhancing SCEC’s computational tools and workflows to support the research community through the release of... more Themes: Research Computing & Cyberinfrastructure	25286
Poster	ASI	The NEHRP post-earthquake investigations program Michael Blanpied Post-earthquake scientific and engineering investigations are undertaken to capture critical information to understand the causes and impacts of the event, lessons from which can substantially improve resilience after future earthquakes. The four-... more Themes: Improving Observations and Closing Data Gaps \| Applied Science Implementation \| Outreach and Community Engagement
Poster	GM	Extending Kinematic Rupture Generators to Multisegment Geometries Brendon Bradley, Jake Faulkner Kinematic rupture generators are an essential component of simulation-based ground motion prediction used in probabilistic seismic hazard analysis, such as CyberShake. One important limitation of such simulation-based ground motion predictions to... more Themes: Advanced Modeling Frameworks \| Applied Science Implementation \| Research Computing & Cyberinfrastructure
Poster	GM	Update on the California Strong Motion Instrumentation Program’s Progress toward Real Time Data Acquisition and Development of Engineering Related Applications Dave Branum, Hamid Haddadi The California Strong Motion Instrumentation Program (CSMIP) network, comprising over 1350 seismic stations, has traditionally operated as a triggered system, where segments of strong motion data are sent into the CSMIP server only when shaking at a... more Themes: Improving Observations and Closing Data Gaps
Poster	FARM	The Effects of Bulk Friction and Cohesion in 2D Dynamic Models of the 1971 San Fernando Earthquake Guadalupe Bravo, David Oglesby, Elyse Gaudreau, Gareth Funning, Edwin Nissen, James Hollingsworth Deformation in an earthquake is often partitioned between slip on the fault and off-fault processes. Significant off-fault deformation was measured for the 1971 Mw 6.6 San Fernando Earthquake, where the steeply dipping Sylmar fault segment, which... more Themes: Developing Rheologies and Bridging Multi-Scales	23189, 22141
Talk	FARM	Heterogeneous high frequency seismic radiation from dynamic rupture interactions with a normal stress bump Sara Beth Cebry Fault geometric heterogeneities of varying scale, such as roughness, stepovers, or other irregularities influence dynamic rupture and the spectra of radiated seismic waves. To investigate the effect of normal stress heterogeneity on dynamic rupture... more Themes: Developing Rheologies and Bridging Multi-Scales
Poster	EFP	Improving Real-Time Forecasts of Induced Seismicity Through Machine Learning-Based Event Classification with an Attention-Enhanced U-Net Architecture Avigyan Chatterjee, Qingkai Kong, Kayla Kroll, Chengping Chai , Paul Friberg, Alex Dzubay, Jeffrey Liefer, Scott Fertig, Josh Stachnik Accurate and rapid classification of seismic events is essential for real-time monitoring and informed decision-making in subsurface industrial operations. In this project, we advance seismic event classification by developing a robust machine... more Themes: Improving Observations and Closing Data Gaps \| Improving Predictive Analyses of Seismicity \| Research Computing & Cyberinfrastructure
Poster	FARM	Modeling slip on rate-and-state faults induced by off-fault fluid injection William Chen, Nadia Lapusta, Xiaojing (Ruby) Fu Elevated pore fluid pressures due to fluid injection in the subsurface can induce both seismic and aseismic slip on faults. The spatial and temporal variations in pore fluid pressures experienced by the fault are in turn determined by the nature of... more Themes: Advanced Modeling Frameworks
Poster	Geology	3D modeling of ground rupture in thrust and reverse fault earthquakes: a distinct element approach Kristen Chiama, Andreas Plesch, John Shaw Thrust and reverse fault scarps that form during large earthquakes often feature complex patterns of distributed folding, fracturing, and uplift in surface fault ruptures that can vary significantly along-strike. We aim to evaluate the influence of... more Themes: Improving Observations and Closing Data Gaps \| Advanced Modeling Frameworks	22013
Poster	ASI	Making CyberShake Friendly to General Users: CyberShake Data Access GUI Mario Chong Loo, Natasha Tiwari, Yongfei Wang, Scott Callaghan CyberShake is physics-based seismic hazard analysis software developed by the SCEC (Statewide California Earthquake Center). The CyberShake Data Access Tool provides data products including site info, seismograms, intensity measures, and event info... more Themes: Applied Science Implementation \| Research Computing & Cyberinfrastructure
Poster	EFP	Mechanics and statistics of aftershaking during the 2019 Ridgecrest, CA sequence Tim Clements, Elizabeth Cochran, Sarah Minson, Nicholas van der Elst, Clara Yoon, Annemarie Baltay, Morgan Page Large earthquakes usually generate afterslip and a measurable increase in the rate of aftershocks in the seconds to days following rupture. However, catalog-based aftershock rates are difficult to measure in this interval because body, surface, and... more Themes: Improving Observations and Closing Data Gaps \| Improving Predictive Analyses of Seismicity
Poster	Seismology	Ground motion variability observed in the 2019 Ridgecrest, California earthquake sequence Elizabeth Cochran, Grace Parker, Sarah Minson, Annemarie Baltay We estimate ground motion variability and spatial correlations in the region near the 2019 Ridgecrest, California earthquake sequence. Ground motions are known to be highly variable about their median expected values, yet to accurately estimate... more Themes: Improving Observations and Closing Data Gaps \| Improving Predictive Analyses of Seismicity
Poster	Geodesy	An Ensemble of Block Models Applied to Southern California Monica Diaz, Eileen Evans Pacific-North American plate boundary deformation in Southern California is distributed across a geometrically complex fault system. Understanding the strain distribution across faults in such a complex network requires robust estimates of fault... more Themes: Improving Observations and Closing Data Gaps
Poster	Geology	Provenance and deformation of southern San Andreas fault gouge: insights from illite K-Ar thermochronometry and stable isotope (δ2H) geochemistry Alexandra DiMonte, Lydia Bailey, Alexis Ault, Dennis Newell, Audrey Warren, Stephen Cox, Sidney Hemming, Greg Hirth The southern San Andreas fault (SSAF) system exposed in Mecca Hills, CA, is a natural laboratory to investigate the development of shallow on- and off-fault deformation at depth in space and time. Rocks actively deforming in the fault in the past... more Themes: Developing Rheologies and Bridging Multi-Scales	23081, 22082
Poster	Geology	A Record of Earthquakes along the Northern San Andreas Fault from Subsidence Events within Tomales Bay, California Claire Divola, Alexander Simms, Ed Garrett During the 1906 San Francisco earthquake, portions of the marshes in upper Tomales Bay, which floods part of the San Andreas Fault valley, experienced coseismic subsidence. Thus, the deposits of these marshes may hold a record of past earthquakes... more Themes: Improving Observations and Closing Data Gaps	25329
Poster	Geology	Paleoseismic Insights from Submarine Mass Transport Deposits in the San Nicolas Basin Andrea Fabbrizzi, Jillian Maloney, Sigworth Alicia The San Nicolas Basin, extending ~80×60 km and oriented N46°W, is aligned sub-parallel to the regional tectonic fabric of the Outer California Borderland. The northern margin displays an arcuate geometry, indicative of potential structural control... more Themes: Improving Observations and Closing Data Gaps
Poster	Seismology	Lessons learned in the field: Collecting seismic data in Walker Lane Heather Ford, Roby Douilly, Ashley Stroup, Joseph Byrnes, Delton Samuel The collection of geophysical data requires significant planning and thoughtful execution. Logistical challenges can make even theoretically simple deployments difficult to complete and often require years of preparation. Despite this, the... more Themes: Improving Observations and Closing Data Gaps	24118
Poster	FARM	Rupture sensitivity to dynamic source parameters revealed by variational fracture mechanics and adjoint rupture dynamics Rikuto Fukushima, Eric Dunham Dynamic source inversion with fault mechanics advances our fundamental understanding of the earthquake source process and helps overcome the difficulties of non-uniqueness or regularization in kinematic inversion. Stiernström et al. (2024) have... more Themes: Advanced Modeling Frameworks
Poster	FARM	Links between fault mineralogy, fabric, friction, and rupture behavior of the Mw 7.6 Elbistan earthquake, Türkiye Leslie Garcia, Alexis Ault, Alba Rodriguez Padilla, Musa Balkaya, Caden Howlett, Srisharan Shreedharan, Dennis Newell, Sinan Akciz, Cengiz Zabcı, Greg Hirth Shallow (<1 km) fault material properties impact earthquake rupture propagation, seismic wave radiation, and near-field ground shaking. Yet, the relationships among fault zone composition, fabric development, and frictional behavior, and how they... more Themes: Improving Observations and Closing Data Gaps \| Developing Rheologies and Bridging Multi-Scales \| Advanced Modeling Frameworks
Poster	Seismology	Seismogeodetic early warning system: A step forward in tsunami and earthquake warning and mitigation Jonatan Glehman Rapid and accurate estimation of earthquake magnitude is crucial for early warning systems, particularly for coastal populations vulnerable to tsunami and seismic hazards. Traditional approaches relying on regional or teleseismic data introduce... more Themes: Applied Science Implementation
Poster	Geology	Strategies for measuring geologic slip rates Ryan Gold Geologic slip rates are a primary input for probabilistic seismic hazard analyses, which forecast ground shaking in future earthquakes. In the presentation, I examine sources of uncertainty in measuring geologic slip rates along strike-slip faults.... more Themes: Improving Observations and Closing Data Gaps
Poster	Geology	Geological and Frictional Characterization of Damage Zone Structure of the Southern San Andreas Fault at Ferrum and Implications for Coseismic Off-Fault Deformation William Griffith, Aidan Fullriede, Thomas Rockwell, Anthony Torma A spectrum of slip behaviors occurs in active faultzones, ranging between localized slip on centimeters-thick fault principal slip zone to delocalized shear and dilatational deformation across the fault damage zones. Different styles of off-fault... more Themes: Improving Observations and Closing Data Gaps \| Developing Rheologies and Bridging Multi-Scales	23170
Poster	Geodesy	Using Sentinel-1 InSAR time series to characterize postseismic motions around the 2021 Mw 5.3 Calipatria earthquake, Imperial Valley, CA Katherine Guns, Kathryn Materna, Andrew Barbour The Imperial Valley in southernmost California is home to a network of primary and secondary faults, all of which can be impacted by the high heat flow, shallow crust, and volcanic and hydrothermal activity that characterizes the region. Previous... more Themes: Improving Observations and Closing Data Gaps
Poster	Geodesy	Updating the central San Andreas fault creep record with alignment array and differential lidar measurements at high spatial resolution Catherine Hanagan, Stephen DeLong, Jessie Vermeer, Travis Alongi The central San Andreas fault has an exceptional geodetic record, with high precision measurements of surface fault creep dating to the late 1960s from sparsely distributed (multi-km) alignment arrays (AAs) and creepmeters. Subsequent studies extend... more Themes: Improving Observations and Closing Data Gaps
Poster	Seismology	False Positives in the Identification of Dynamic Earthquake Triggering Jeanne Hardebeck, Nicolas DeSalvio, Wenyuan Fan, Andrew Barbour Dynamic earthquake triggering is commonly identified through the temporal correlation between increased seismicity rates and global earthquakes that are possible triggering events. However, correlation does not imply causation. False positives may... more Themes: Improving Predictive Analyses of Seismicity
Poster	ASI	Slip Pulses and PSHA Thomas Heaton 21st Century multistory US buildings are typically designed using Performance Based Earthquake Engineering (PBEE). The goal is to design such that building collapse is very improbable; typically, buildings are designed to survive the largest... more Themes: Applied Science Implementation
Poster	GM	Did They Feel It? Improving our Understanding of Earthquakes and Earthquake Effects using Legacy Macroseismic Data Susan Hough, Aarnav Agrawal, Lori Dengler, William Ellsworth, Lijam Hajos, Margaret Hellweg, Khant Nyi Hlaing, S. Mostafa Mousavi, Robert McPherson, Clara Yoon Even in a big-data era, we have limited instrumental seismic data for large earthquakes at close distances, which are critical for improving resilience of the built environment. Instrumental data can be augmented with empirical ground motion... more Themes: Improving Observations and Closing Data Gaps
Poster	Seismology	Dynamic triggering of earthquakes at Coso and Ridgecrest, California Yu-Fang Hsu, Xiaofeng Meng, Yehuda Ben-Zion Dynamic triggering of earthquakes by transient seismic waves from teleseismic and regional events can be used to explore evolving variations in stresses required for fault failure. Systematically investigating stress state variations along faults by... more Themes: Improving Observations and Closing Data Gaps
Poster	Seismology	Learning Complex Fault Structures from Hypocenter Distributions via Point Cloud Segmentation Yanlan Hu, Gregory Beroza Accurately characterizing fault geometry is an essential task in seismology, underpinning a wide range of analyses from earthquake hazard assessment and stress triggering to dynamic rupture modeling. High-resolution earthquake catalogs – enabled by... more Themes: Improving Observations and Closing Data Gaps \| Advanced Modeling Frameworks \| Improving Predictive Analyses of Seismicity
Poster	GM	Vertical continuation of seismic waveforms through the shallow structure with neural operators Shuye Huang, Yehuda Ben-Zion, Jamison Steidl Seismic waveforms at the surface are strongly affected by linear and nonlinear wave propagation in the geotechnical top layer, topography, various site effects, and local noise sources, which limit the ability to both simulate ground motion and... more Themes: Improving Observations and Closing Data Gaps
Poster	GM	Regional Adjustments to Ground Motion Models for the Santa Barbara Region, California Kenneth Hudson This study develops region specific adjustments to ground motion model source, path, and site terms for the Santa Barbara region of California, a tectonically active area characterized by unique geological features within the broader context of... more Themes: Applied Science Implementation
Poster	Seismology	From fire to fault: Public reactions to the 2025 Los Angeles wildfire alerting as a model for aftershock earthquake early warning response Allen Husker, Sandra Vaiciulyte, Jessie Saunders, Lynn Hulse Timely and trusted warning systems are critical for protecting people from hazards during fast-moving events. Understanding how people perceive and respond to early warning alerts is therefore of urgent importance. In the USA, systems like the... more Themes: Improving Observations and Closing Data Gaps \| Applied Science Implementation \| Outreach and Community Engagement
Poster	FARM	On the use of Discrete Fault Network simulations for time-dependent seismic hazard assessment, application to the Sagaing fault Kyungjae Im, Jean-Philippe Avouac Despite considerable advancements in our understanding of earthquake dynamics, earthquake forecasting remains a daunting challenge. The 2025 Myanmar Mandalay earthquake is a notable case, as it ruptured a ‘seismic gap’ on the Sagaing Fault, where a... more Themes: Advanced Modeling Frameworks \| Improving Predictive Analyses of Seismicity \| Research Computing & Cyberinfrastructure
Poster	Geology	Can Short Earthquakes Imitate the long Ones? Seismic Analysis of a Fault-Crossing Tunnel via ABAQUS Explicit with Focus on Displacements at Critical Points Ahmad Iqbal, Yu Zhang This study examines how fault-crossing tunnels respond to earthquakes of varying durations, focusing on whether short duration seismic windows can effectively simulate the effects of longer duration earthquakes. Specifically, this study compares the... more Themes: Improving Observations and Closing Data Gaps \| Advanced Modeling Frameworks \| Improving Predictive Analyses of Seismicity
Poster	EFP	Earthquake Forecasting Using Single-Station Waveform Detection Without Reliance on Event Catalogs Yuriko Iwasaki, Emily Brodsky, Kelian Dascher-Cousineau Earthquake forecasting directly from waveforms, bypassing traditional catalogs, promises enhanced efficiency since catalogs are derived from waveforms and the raw data inherently encapsulates a broader spectrum of information. For instance,... more Themes: Improving Predictive Analyses of Seismicity
Poster	Geology	Learning from complexity: Paired U-series and (U-Th)/He analyses of hematite fault damage from the southern San Andreas fault Jordan Jensen, Noah McLean, Alexis Ault Hematite-coated slip surfaces in basement-hosted off-fault damage zones in Mecca Hills, CA, formed and deformed by slow slip in the southern San Andreas fault system (SSAF). Prior hematite (U-Th)/He geochronology revealed these slip episodes... more Themes: Improving Observations and Closing Data Gaps	21068, 22082
Poster	FARM	Simulating Swarm-to-Mainshock Evolution at the St. Gallen Geothermal Project SeongJu Jeong, Junle Jiang Induced seismicity can evolve from earthquake swarms to damaging mainshock sequences, but the physics of this transition remains poorly understood. We analyze the 2013 earthquake sequences at the St. Gallen geothermal site in Switzerland, where... more Themes: Advanced Modeling Frameworks \| Improving Predictive Analyses of Seismicity \| Applied Science Implementation
Poster	FARM	Evolution of frictional strength and fluid flow in shear fractures in granitic rock under hydrothermal conditions Tamara Jeppson, David Lockner, Josh Taron, N. Beeler, Stephen Hickman, Diane Moore The failure of faults in the brittle crust is dependent on frictional strength and in situ effective stress. Both are influenced by fluid transport properties of the fault zone, yet relatively few studies have examined the evolution of both... more Themes: Improving Observations and Closing Data Gaps \| Developing Rheologies and Bridging Multi-Scales \| Advanced Modeling Frameworks

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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