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.

SCEC Annual Meeting participants are invited to share recent results and activities relevant to SCEC priorities and initiatives during the poster sessions.

Results 1-50 of 244

SCEC ID	Category	Title and Authors	SCEC Award
Group B Poster 070	SDOT	Effect of spatial discretization order in fault slip inversions Brad Aagaard, Matthew Knepley, Charles Williams We illustrate the effects of different spatial discretization orders (uniform slip over a fault patch, linear variation in slip over a fault patch, and quadratic variation in slip over a fault patch) in static fault slip inversions. We show that... more Themes: Advanced Modeling Frameworks
Group A Poster 149	FARM	Ground Motion Characteristics of Subshear and Supershear Ruptures in the Presence of Sediment Layers Mohamed Abdelmeguid, Ahmed Elbanna, Ares Rosakis Our study examines how sediment layers affect ground motion during subshear and supershear earthquake ruptures. We find that sediments can potentially cause localized supershear propagation, particularly influencing ground motion in the direction... more Themes: Improving Observations and Closing Data Gaps \| Improving Predictive Analyses of Seismicity \| Applied Science Implementation	24014
Group A Poster 061	Seismology	Preliminary comparative analysis of results submitted to the International SCEC/USGS Community Stress Drop Validation Study and future plans Rachel Abercrombie, Annemarie Baltay We present a comparative analysis of the 56 sets of results submitted to the first stage of the SCEC/USGS Community Stress Drop Validation study. The Community study has engaged a wide, international group focused on a common dataset of the 2019... more Themes: Improving Observations and Closing Data Gaps	22042, 23107, 24067
Group A Poster 135	FARM	Supershear transition on 3D faults with favorable heterogeneity Mary Agajanian, Nadia Lapusta Supershear ruptures are characterized by propagation speeds which exceed the shear wave speed of the surrounding bulk. These ruptures have a characteristic Mach front which carries large shaking velocities far from the fault. The traditional... more Themes: Advanced Modeling Frameworks	23130
Group B Poster 226	CEM	Salton Trough crustal model optimization: Wasserstein kernel Rasheed Ajala, Folarin Kolawole Earth models in high seismic risk areas must be optimized using high-frequency data to become relevant for deterministic earthquake hazard assessment and detailed subsurface geologic studies. The computational cost of such pursuit is high but has... more Themes: Improving Observations and Closing Data Gaps \| Advanced Modeling Frameworks \| Applied Science Implementation	23178, 24043
Group B Poster 058	Seismology	Specialized Scientific Language Models for Research and Education: A Pilot Study Majd Alahmed, Ahmed Elbanna, Napat Tainpakdipat, Harsh PV AI chatbots and language models (LMs) like ChatGPT have rapidly advanced, becoming increasingly prevalent. However, these models still struggle with reliability, particularly in higher education, where accuracy in science-related topics is crucial.... more Themes: Education and Workforce Development	24188
Group B Poster 160	FARM	Rate-and-state simulations of fluid-injection laboratory experiments Maryam Alghannam, Nadia Lapusta, Ares Rosakis, Stacy Larochelle, Vito Rubino, Krittanon Sirorattanakul, Attilio lattanzi Understanding the influence of fluid pressure on friction and fault stability is essential in efforts to mitigate the seismic risk associated with subsurface operations. Recent frictional sliding experiments on PMMA surfaces by Gori et al. (2021)... more Themes: Advanced Modeling Frameworks \| Improving Predictive Analyses of Seismicity \| Applied Science Implementation
Group B Poster 120	FARM	From Hypocentral Seismicity Patterns to 3D Fault Models Travis Alongi, Austin Elliott, Rob Skoumal, Alex Hatem, David Shelly Three-dimensional (3D) fault geometry plays a crucial role for understanding earthquake behavior and refining seismic hazard models. However, detailed subsurface fault structures are often poorly constrained due to low resolution imaging methods or... more Themes: Improving Observations and Closing Data Gaps \| Advanced Modeling Frameworks \| Applied Science Implementation
Group B Poster 026	Seismology	Impact of Empirical Green’s Functions on Estimating Rupture Velocity with Back-Projection Across Various Rupture Scenarios Miguel Álvarez-Martinez, Liuwei Xu, Lingsen Meng Understanding rupture propagation on faults and accurately measuring source parameters are crucial for enhancing earthquake response times, potentially saving lives, and minimizing damage. We developed a method to utilize waveform data from... more Themes: Improving Observations and Closing Data Gaps
Group B Poster 104	Geology	Constraining the aleatoric variability in rupture location over the ~100 m-scale based on a formalized analysis of past paleoseismic trenching studies Ramon Arrowsmith, Chelsea Scott, Christopher Madugo, Albert Kottke Paleoseismic trench investigations provide a direct indication of fault location and the distribution of faulting across the fault zone. This analysis addresses aleatoric variability in rupture characteristics (of relevance to fault displacement... more Themes: Improving Observations and Closing Data Gaps \| Improving Predictive Analyses of Seismicity \| Applied Science Implementation
Group B Poster 220	RC	Evaluation of Distributed Acoustic Sensing Phase Pick Quality and Performance for Operational Earthquake Monitoring Nytica Artiaga, Ettore Biondi, Gabrielle Tepp, Allen Husker Distributed Acoustic Sensing (DAS) is an emerging technology for earthquake monitoring and subsurface imaging given its ability to convert existing telecommunication fiber cables into dense seismic arrays. However, its distinct characteristics, such... more Themes: Improving Observations and Closing Data Gaps \| Applied Science Implementation \| Research Computing
Group B Poster 194	EFP	A prototype of an interactive viewer for aftershock forecast maps based on user needs Bianca Artigas, Max Schneider, Anne Wein Aftershocks following large earthquakes can be forecasted using statistical models. Forecasts of aftershock rates and ground shaking are released by organizations such as the U.S. Geological Survey (USGS) to communicate the hazards. Currently,... more Themes: Improving Predictive Analyses of Seismicity \| Applied Science Implementation \| Research Computing
Group B Poster 182	GM	Development and Verification of a Neural Operator Based Nonlinear Site Response Module for the San Francisco Bay Area Domniki Asimaki, Flora Xia, Grigorios Lavrentiadis The proliferation of seismic record repositories through the expansion of seismic networks and high-performance computer simulations of earthquake scenarios, have produced ground-motion databases rich enough to enable data-driven models of ground-... more Themes: Applied Science Implementation \| Research Computing
Group A Poster 137	FARM	Healing and frictional behavior of the shallow southern San Andreas fault gouge reveals ability to host geodetically observed creep events Alexis Ault, Alexandra DiMonte, Srisharan Shreedharan, Greg Hirth The southern San Andreas fault (SSAF) may be at the end of its earthquake cycle, but it releases some shallow strain as spontaneous and triggered creep events with cumulative slip of ~10 mm/event. The SSAF in Coachella Valley and associated... more Themes: Improving Observations and Closing Data Gaps \| Developing Rheologies and Bridging Multi-Scales	23081, 22082
Group B Poster 108	Geology	Paleoseismic history of the Needles Fault, AZ: preliminary results from tectonogeomorphic analyses Anneke Avery, Christine Regalla The Needles fault on the Arizona-California border is a distributed active fault network in the Colorado River Extensional Corridor of the Basin and Range. It is one of few known active faults in the corridor and may pose seismic hazards to nearby... more Themes: Improving Observations and Closing Data Gaps
Group A Poster 159	FARM	Modeling the effect of local fault kinematics on shallow fault deformation along the M7.1 2019 Ridgecrest earthquake surface rupture with discrete element analysis Curtis Baden, Josie Nevitt, Fernando Garcia, Benjamin Brooks, Todd Ericksen, Simone Yeager Surface deformation associated with shallow strike-slip faulting produces complex fracture networks and shear zones whose geometries can significantly vary along-strike despite having formed along the same fault during the same earthquake and even... more Themes: Developing Rheologies and Bridging Multi-Scales \| Advanced Modeling Frameworks
Group A Poster 065	Seismology	Using SCEC/USGS Community Stress Drop Validation Study seismic moments to examine Southern California Moment and Magnitude Scales and implications for b-value modeling Annemarie Baltay, Rachel Abercrombie, Justin Rubinstein, Nicholas van der Elst We illustrate the systematic difference between moment magnitude (M or Mw) and local magnitude (ML) caused by underlying earthquake source physics, using seismic moment (M0) measurements submitted to the Statewide California Earthquake Center/United... more Themes: Improving Observations and Closing Data Gaps \| Improving Predictive Analyses of Seismicity	24067, 23107, 23108, 22042, 22101, 21083, 21114
Group A Poster 195	CCB	An Immersive Experience of the Brawley Seismic Zone Using Virtual Reality Katie Baraggiotta, Katina Carranza, Christodoulos Kyriakopoulos In this work, we focused on developing a Virtual Reality (VR) experience to visualize seismic activity in California, with emphasis on the Brawley Seismic Zone (BSZ). Our VR experience vividly illustrates seismicity in the BSZ and surrounding faults... more Themes: Education and Workforce Development \| Outreach and Community Engagement
Group B Poster 140	FARM	Experimental Constraints on Fault Healing and Shallow Earthquake Rupture Propagation in Altered, Clay-rich Serpentinite Gouge, Bartlett Springs Fault, CA Monica Barbery, Emma Armstrong, Ainsley MacDonald, Srisharan Shreedharan, Alexis Ault, Greg Hirth Creep influences the earthquake cycle and modulates stress on faults. The northern San Andreas fault system comprises creeping faults with altered serpentinite. An outstanding question is the extent to which instabilities can nucleate in and/or... more Themes: Improving Observations and Closing Data Gaps \| Developing Rheologies and Bridging Multi-Scales	24119
Group B Poster 114	FARM	Does the direct effect of friction increase continuously with absolute temperature? Sylvain Barbot Constitutive models of fault friction form the basis of physics-based simulations of seismic activity. A generally accepted framework for the slip-rate and state dependence of friction involves a thermally activated process, whereby the probability... more Themes: Developing Rheologies and Bridging Multi-Scales	24057
Group B Poster 048	Seismology	Comparing the efficacy of deep learning phase pickers and associations for developing earthquake catalogs Alexa Baxter, Julian Bunn, Elizabeth Cochran, Clara Yoon Earthquake catalogs – lists of the time, location, and magnitude of earthquakes – are an essential tool in the field of seismology for documenting the occurrence and probing the cause and evolution of earthquake sequences. In recent years, deep... more Themes: Improving Observations and Closing Data Gaps
Group B Poster 004	Seismology	Isotropic high-frequency radiation in near-fault seismic data Yehuda Ben-Zion, Siyuan Zhang, Xiaofeng Meng We compare Fourier Amplitude Spectra of Fault Normal (FN) and Fault Parallel (FP) seismograms at near-fault sites for 7 strike-slip earthquakes with moment magnitudes Mw≥6. For all events we find large FN/FP ratios at low frequencies consistent with... more Themes: Improving Observations and Closing Data Gaps
Group B Poster 124	FARM	Models of fluid-driven seismic swarms with permeability enhancement and rate-and-state friction Natalia Berrios-Rivera, So Ozawa, Eric Dunham Anthropogenic fluid injections and natural fluid flow in Earth’s crust lead to an increase in pore pressure, which can trigger earthquake swarms characterized by a migrating seismicity front. Observations of seismicity expanding with the same... more Themes: Advanced Modeling Frameworks	24187
Group B Poster 138	FARM	The gradual evolution of friction following a normal stress step reflects changes in contact strength, not contact area Pathikrit Bhattacharya, Terry Tullis, Allan Rubin, N. Beeler, Nir Badt Rate and state friction refers to the dependence of friction on the velocity of sliding, and on the ‘state’ of the frictional interface that has been poorly understood for fifty years. Empirically, the state of a frictional interface has been found... more Themes: Developing Rheologies and Bridging Multi-Scales
Group B Poster 130	FARM	Most continental transform ruptures start on a minor branch fault, then propagate unilaterally: Implications for the physics of slip Peter Bird, Ross Stein We propose a new model for typical large-earthquake ruptures on continental transforms, based on two recent discoveries: (1) A review of the seismological literature [Stein & Bird, 2024, SRL] shows that the 5 Mw≥7.8 continental transform... more Themes: Developing Rheologies and Bridging Multi-Scales \| Improving Predictive Analyses of Seismicity
Group B Poster 118	FARM	Model for permeability enhancement from yielding in fault damage zones during the passage of a rupture Laura Blackstone, Eric Dunham When faults rupture, a region of off-fault yielding or plastic deformation, referred to as the damage zone, occurs around the fault surface as secondary fractures form and/or slip. This increases the permeability of the damage zone. The increased... more Themes: Developing Rheologies and Bridging Multi-Scales \| Advanced Modeling Frameworks	24187
Talk Mon1400	CCB	Communicating about earthquakes in crisis and calm Wendy Bohon Our communication has an impact. When we are communicating about earthquakes--which can affect people’s lives, livelihoods, and mental health—what we say and how we say it is central to building trust, understanding, and resilience. In this talk we... more Themes: Outreach and Community Engagement
Group B Poster 156	FARM	The Influence of Fault-Dip Variations on Multicycle Earthquake Rupture Dynamics of the San Andreas Fault Hasti Bordbar, Benchun Duan, Qingjun Meng, Zhi Shang, Zizhuang Tang The Mojave section of the San Andreas Fault (SAF) offers a unique study area due to its relatively straight surface trace, which is bounded by the Big Bend to the north and the San Jacinto Fault (SJF) to the south, encompassing a southwest-dipping... more Themes: Advanced Modeling Frameworks \| Improving Predictive Analyses of Seismicity \| Research Computing
Group A Poster 085	Geodesy	Estimating Earthquake Ground Acceleration using InSAR Coherence and Topographic Gradient Matthew Brandin, David Sandwell We explore the potential for using InSAR coherence to estimate earthquake ground acceleration in hilly and sloped terrain. We use simple Newmark sliding models, along with a Digital Elevation Model (DEM) of local topography, and InSAR coherence data... more Themes: Improving Observations and Closing Data Gaps
Group A Poster 125	FARM	Plasticity and Off-Fault Deformation in the 1971 San Fernando Earthquake Guadalupe Bravo, David Oglesby, Elyse Gaudreau, Gareth Funning, Edwin Nissen, James Hollingsworth Slip and off-fault deformation both occur during an earthquake, with the former measured on the fault and the latter away from it. Significant off-fault deformation was measured for the 1971 San Fernando Earthquake, in which the steeply-dipping... more Themes: Advanced Modeling Frameworks	23189, 22141
Group B Poster 218	RC	Using the Segment Anything Model to expedite surficial geologic mapping Cassandra Brigham, Chelsea Scott, Samuel Johnstone, Zhiang Chen, Christopher Crosby, Ramon Arrowsmith Mapping Quaternary geologic units is an essential component of fault zone mapping. However, detailed manual mapping is time consuming. We propose a workflow that harnesses the expertise of a geologic mapper with the speed and repeatability of a deep... more Themes: Improving Observations and Closing Data Gaps \| Applied Science Implementation \| Research Computing
Group A Poster 047	Seismology	Coseismic reorientation of the crustal stress field at the base of the 2019 Ridgecrest earthquake fault zone Jared Bryan, William Frank, Pascal Audet The 2019 Ridgecrest earthquake sequence marks the largest seismic event in Southern California in over 20 years. Information on stress and damage evolution throughout the fault zone is necessary for understanding the dynamics of the event. Noise-... more Themes: Improving Observations and Closing Data Gaps \| Developing Rheologies and Bridging Multi-Scales	24190
Group A Poster 169	GM	Earthquake-source parameters: Are they what you think they are? Tristan Buckreis, Brian Chiou, Robert Darragh, Robert Graves, Jonathan Stewart From depths to rupture representations, earthquake-source parameters listed in ground motion databases are often compiled from a variety of references that may not be compatible with each other. In the process of assembling the Next Generation... more Themes: Improving Observations and Closing Data Gaps
Group A Poster 181	GM	Apparent geometric decay in near field for a 1D layered earth Jakub Bystricky, Chen Ji Most earthquake damage resulting from high frequency strong ground motion occurs within a close proximity to the fault, for example the distance to source R <50 km. Recent studies have revealed that the high frequency ground motion decay much... more Themes: Research Computing
Group A Poster 175	GM	Updates to CyberShake Physics-Based PSHA for Northern California Scott Callaghan, Philip Maechling, Fabio Silva, Christine Goulet, Kevin Milner, Mei-Hui Su, Xiaofeng Meng, Camilo Ignacio Pinilla Ramos, Kim Olsen, Robert Graves, Norman Abrahamson, Albert Kottke, Karan Vahi, Ewa Deelman, Thomas Jordan, Yehuda Ben-Zion The SCEC-developed CyberShake platform performs physics-based probabilistic seismic hazard analysis. CyberShake uses 3D wave propagation simulations with a reciprocal approach to synthesize seismograms, intensity measures, site-specific hazard... more Themes: Advanced Modeling Frameworks \| Research Computing
Group A Poster 193	CCB	A Virtual Reality Experience Combining the California Fault System with Elements of Urban Environment Katina Carranza, Katie Baraggiotta, Christodoulos Kyriakopoulos The general public's understanding of the spatial extent of active earthquake faults can be inaccurate and misunderstood. Of particular interest is how earthquake faults intersect with urban environments and how citizens perceive (or ignore)... more Themes: Education and Workforce Development \| Outreach and Community Engagement
Group B Poster 066	SDOT	A Comprehensive Earthquake Focal Mechanism Catalog for Nevada Obtained Through Deep Learning Algorithms Avigyan Chatterjee, Gaurav Srikar, Colin Pennington, Daniel Trugman, William Walter The state of Nevada ranks among the most seismically active regions in the United States, characterized by numerous active fault systems throughout the Walker Lane and Basin and Range tectonic areas. Despite the high seismic activity rates, Nevada... more Themes: Improving Observations and Closing Data Gaps \| Advanced Modeling Frameworks
Group B Poster 158	FARM	Velocity dependence of dynamic rock friction in high-speed friction and stick-slip tests Xiaofeng Chen, Frederick Chester The evolution of rock friction during earthquakes is a fundamental question in earthquake science, and the dependence of rock friction on fault slip rate plays a crucial role. Experimental studies on the velocity dependence of rock friction... more Themes: Developing Rheologies and Bridging Multi-Scales	24113
Group B Poster 164	FARM	Swarms and Foreshocks in the SAF system Xiaowei Chen Earthquakes strongly cluster in space and time. There are three basic types of clusters: mainshock-aftershocks, foreshock-mainshock-aftershocks, and earthquake swarms. While aftershocks are commonly understood as triggering due to stress transfer... more Themes: Improving Observations and Closing Data Gaps \| Improving Predictive Analyses of Seismicity	24157, 21032, 22042
Talk Tue0800	RC	Robotics for earthquake science: more data, new analyses Zhiang Chen Machine learning has revolutionized data processing, yet collecting large datasets for its application in earthquake science remains a challenge. This talk introduces the use of robotics to automate data collection, a crucial step toward automating... more Themes: Improving Observations and Closing Data Gaps \| Research Computing
Group A Poster 089	Geology	Quantifying relationships between fault parameters and surface deformation associated with thrust and reverse fault earthquakes: A distinct element approach Kristen Chiama, William Bednarz, Robb Moss, Andreas Plesch, John Shaw We evaluate the influence of geological site characteristics and earthquake source parameters on fault scarp morphologies for thrust and reverse fault earthquakes using geomechanical models. Based on the distinct element method (DEM), we performed 3... more Themes: Improving Observations and Closing Data Gaps \| Research Computing	22013
Group B Poster 214	RC	Quakeworx: A New Science Gateway for Earthquake Simulation and Data Analysis Amit Chourasia, Youn Choonhan, Fabio Silva, Bar Oryan, Chunhui Zhao, Jeena Yun, Napat Tainpakdipat, Philip Maechling, David May, Ahmed Elbanna, Alice-Agnes Gabriel, Yehuda Ben-Zion The Quakeworx science gateway provides a cyberinfrastructure platform for the broad community to easily use and reuse computational tools on earthquake simulations and data analysis, significantly reduce barriers to users, and facilitate rapid... more Themes: Advanced Modeling Frameworks \| Research Computing \| Education and Workforce Development
Group B Poster 006	Seismology	Spatial Probabilistic Quantification of Enhanced Earthquake Detection Using a Machine Learning Picker Jaehong Chung, Ian McBrearty, Yongsoo Park, Gregory Beroza Recently, machine learning pickers have surpassed traditional pickers in terms of both accuracy and the quantity of earthquake detections; however the spatial detection variability of machine learning pickers has not yet been fully explored. This... more Themes: Improving Observations and Closing Data Gaps
Group B Poster 184	GM	Time-step and Duration of Waveforms Influence on Ground Motion Simulation Validation Karen Clark, Sajan K C, Chukwuebuka Nweke When validating earthquake simulations, it is necessary to ensure that the frequency content of the simulation matches historical recordings. Fourier Amplitude Spectra (FAS) is commonly used for this comparison. FAS is a visualization of the... more Themes: Advanced Modeling Frameworks \| Improving Predictive Analyses of Seismicity \| Applied Science Implementation
Group B Poster 206	EFP	Beyond Magnitudes and Catalogs: Application of Gutenberg-Richter and Omori Laws to Continuous Seismograms Tim Clements, Elizabeth Cochran, Sarah Minson, Nicholas van der Elst, Clara Yoon, Annemarie Baltay, Morgan Page Real-time earthquake forecasting methods have focused on forecasting the future rate of earthquakes from recent earthquake rates, while thinking of earthquakes as discrete events. In most cases, end users rely on earthquake forecasts to inform... more Themes: Improving Observations and Closing Data Gaps \| Improving Predictive Analyses of Seismicity
Group A Poster 055	Seismology	Testing the repetitiveness of repeating earthquakes: Analyzing spatiotemporal changes of repeating earthquake characteristics in response to seismicity Norma Contreras, Gareth Funning, Rachel Abercrombie Understanding the factors that influence earthquake recurrence is important for hazard and risk assessment, but the long recurrence times for larger events make it difficult to analyze the factors affecting their recurrence. We use repeating... more Themes: Improving Predictive Analyses of Seismicity	24176
Group B Poster 216	RC	Porting topography version of AWP-ODC to OLCF Frontier, with ROCm-Aware support to improve the performance of collective communication Yifeng Cui, Akash Palla, Arnav Talreja, Lars Koesterke, Wenyang Zhang, Te-Yang Yeh, Philip Maechling We have ported and verified the topography version of AWP-ODC, with discontinuous mesh feature enabled, to HIP so that it runs on AMD MI250X GPUs. 103.3% parallel efficiency was benchmarked on Frontier between 8 and 4,096 nodes or up to 32,768 GCDs... more Themes: Advanced Modeling Frameworks \| Research Computing
Group B Poster 210	EFP	Synchronization among characteristic earthquakes Kelian Dascher-Cousineau, Roland Bürgmann We note that characteristic earthquake repeaters, oceanic transform faults, sub-parallel strike slip faults, and subduction zones can all exhibit synchronization. Nearby faults repeatedly fail characteristically and close in time. Synchronization in... more Themes: Improving Predictive Analyses of Seismicity
Talk Wed0800	Seismology	Tracking Temporal Changes in the Subsurface Structure Near Faults and Populated Areas Marine Denolle The Earth's materials deform intensely at plate boundaries and are constantly worked at the surface by urbanization, changing shallow hydrology, and dynamic landscapes. This talk will review the evidence from long-term observations that... more Themes: Improving Observations and Closing Data Gaps \| Research Computing
Group A Poster 091	Geology	A record of past earthquakes along the Northern San Andreas Fault from subsidence events within Tomales Bay 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, underwent co-seismic subsidence. Thus, the deposits of these marshes may hold a record of past earthquakes... more Themes: Improving Observations and Closing Data Gaps	24112

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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