Meeting Abstracts

SCEC Annual Meeting participants are invited to share recent results and activities relevant to SCEC priorities and initiatives during the poster sessions. The SCEC collaboration emphasizes the connections between information gathering by sensor networks, fieldwork, and laboratory experiments; knowledge formulation through physics-based, system-level modeling; improved understanding of seismic hazard; and actions to reduce earthquake risk and promote resilience.

Use the search form to view abstracts of presentations that have been accepted for this meeting.

Results 201-250 of 301

SCEC ID	Category	Title and Authors	SCEC Award
Group A Poster 263	CXM	Fault zone evolution along complex plate boundaries: A case study from the Eastern California shear zone George Pharris Spatiotemporal patterns of deformation within plate boundary systems reflect complex interactions across a wide range of processes and scales. For example, stress transfer during earthquakes, interseismic strain accumulation, large-scale variations... more Themes: Stress and Deformation Over Time \| Community Models
Group B Poster 090	Geology	Trenching the Greater Caucasus Frontal Thrusts Ian Pierce, Sabina Kazimova, Neill Marshall, Ben Johnson, Richard Walker Here we present the results of the first paleoseismic investigation of the Greater Caucasus Frontal Thrust in Azerbaijan. The Greater Caucasus Thrust is an imbricate fold and thrust belt extending nearly 900 km from the Caspian Sea to the Black Sea... more
Group A Poster 259	CXM	The SCEC Community Fault Model Version 6.0: additions and updates after community evaluation Andreas Plesch, Scott Marshall, Ana Luiza Nicolae, John Shaw, Mei-Hui Su, Philip Maechling, Tran Huynh, Edric Pauk We present a new, comprehensive update to the SCEC Community Fault Model (CFM 6.0) along with enhancements to the web-based model viewer and database. This model version is designated with a major release number due to significant revisions from the... more Themes: Community Models	22066
Group C Poster 076	Geodesy	Viscoelastic fault-based model of crustal deformation for the 2023 update to the US National Seismic Hazard Model Fred Pollitz The 2023 update to the National Seismic Hazard (NSHM) model is informed by several deformation models that furnish geodetically estimated fault slip rates. Here I describe a fault-based model that permits estimation of long-term slip rates on... more Themes: Stress and Deformation Over Time \| Beyond Elasticity \| Probabilistic Seismic Hazard Analysis
Group B Poster 258	SAFS	Fault Trace Mapping of the Central SAF from Lidar Topography Joseph Powell, Chelsea Scott, Ramon Arrowsmith We are generating a fault trace and surficial geologic map of the creeping section of the Central San Andreas Fault, from San Juan Bautista to Parkfield using relatively new lidar topography. The aim is to utilize high-resolution lidar-derived DEMs... more Themes: Stress and Deformation Over Time \| Special Fault Study Areas: Focus on Earthquake Gates
Group A Poster 185	SDOT	Regularized internal rate and state friction in the context of a damage-breakage rheology Casper Pranger, Dave A. May, Ludovic Raess, Yehuda Ben-Zion, Alice-Agnes Gabriel A recently developed formulation of rate and state friction (Pranger et al., 2022) treats friction as an internal process in a granular medium, instead of its conventional treatment as a process on a surface between juxtaposed rocks. The spurious... more Themes: Stress and Deformation Over Time \| Beyond Elasticity \| Modeling Earthquake Source Processes	21112
Group A Poster 103	Geology	Rigorous slip uncertainty estimates using principal components analysis (PCA): An example from the San Andreas fault, California Veronica Prush, Michael Oskin Quaternary fault slip rate calculations require a measurement of landform offset due to fault activity and an age for the offset feature. Though offset landforms along fault traces are readily identifiable in tectonically active landscapes,... more
Group B Poster 060	Seismology	Monitoring seasonal shear wave velocity changes at Garner Valley in Southern California using earthquake data and a cross-hole experiment Lei Qin, Jamison Steidl, Hongrui Qiu, Nori Nakata, Yehuda Ben-Zion We monitor seasonal variations of near-surface shear-wave velocity (VS) using impulse response functions of earthquake (2005-2018) and cross-hole experiment (2015-2018) data from borehole instruments at Garner valley, CA. The shear-wave travel time... more
Group B Poster 028	Seismology	Internal structure of the Garlock fault zone from Ridgecrest aftershocks recorded by dense linear seismic arrays Hongrui Qiu, Benxin Chi, Yehuda Ben-Zion Along the northern edge of the Mojave Desert, the Garlock fault intersects the San Andreas fault and is the second largest (~300 km long) fault in Southern California. It can host M>7 earthquakes that pose significant seismic hazard to densely... more
Group A Poster 165	FARM	Semi-automated extraction of fault displacement profiles and displacement-length relationships from high-resolution lidar data and standard fault maps Mercedes Quintana, Alba Rodriguez Padilla, Duncan Chadly, Michael Oskin Faults grow over time through incremental slip events. The finite distribution of displacements on faults, and the ratio of the maximum displacement at the surface to the fault length are frequently sought after in fault mechanics, as these metrics... more Themes: Stress and Deformation Over Time \| Data-Intensive Computing
Group A Poster 071	Geodesy	A secondary zone of uplift measured after megathrust earthquakes: caused by early downdip afterslip? Théa Ragon, Mark Simons A secondary zone of surface uplift, located a few hundred kilometers from the trench, has been measured after several megathrust earthquakes. The secondary zone of uplift reaches a few centimeters in data acquired hours to days after the 2011 Mw 9.1... more Themes: Modeling Earthquake Source Processes
Group A Poster 011	Seismology	Machine-Learning catalog for the California-Baja California, Mexico, border region Erik Ramírez-Ramos, Joann Stock, Zachary Ross, Antonio Vidal-Villegas The region of the southernmost California-Northern Baja California, Mexico, presents significant seismicity, generated mainly by the San Andreas-Gulf of California fault system. This system has caused earthquakes of magnitudes Mw 6.5, 1979 Imperial... more Themes: Data-Intensive Computing
Group A Poster 249	SAFS	Predicting Off-fault Deformation Using Experiment-Trained Convolutional Neural Networks on Faults of Different Maturity in Southern California Christ Ramos Sanchez, Michele Cooke, Hanna Elston, Laainam Chaipornkaew, Sarah Visage, Pauline Souloumiac, Akshay Sharma Surface offsets might not represent slip at seismogenic depths because earthquakes produce shallow distributed off-fault deformation. Scaled physical experiments simulate off-fault deformation processes and provide direct observations of deformation... more Themes: Stress and Deformation Over Time
Group B Poster 082	Geology	Late Holocene rupture history of the Ash Hill Fault (ECSZ) and the potential for seismogenic strain transfer between adjacent fault systems Christine Regalla, Shannon Mahan, Eric Kirby, Eric McDonald, Aubrey LaPlante The eastern California Shear Zone (ECSZ) contains networks of crustal faults that accommodate strain transfer across geometrically complex fault systems. Large magnitude earthquakes appear able to rupture across adjacent fault systems, but... more Themes: Stress and Deformation Over Time \| Probabilistic Seismic Hazard Analysis
Group A Poster 089	Geology	Beyond COPD: Assumptions, applications, and new approaches for interpreting the geomorphic record of strike slip Nadine Reitman, Yann Klinger, Rich Briggs, Ryan Gold The cumulative offset probability density (COPD) method is the primary way that researchers interpret paleoslip distributions from offset geomorphic landforms along strike-slip faults. The COPD method assumes earthquakes have constant slip along a... more Themes: Data-Intensive Computing \| Probabilistic Seismic Hazard Analysis \| Post-Earthquake Rapid Response
Group B Poster 224	GM	Reduced-order modeling for physics-based ground motion simulation John Rekoske, Alice-Agnes Gabriel, Dave May With the increase of machine learning (ML) applications in seismology, new research is needed to develop hybrid frameworks that combine ML with physics-based modeling. While ML methods have shown promising results for extracting information from... more Themes: Data-Intensive Computing \| Ground Motion Simulation \| Post-Earthquake Rapid Response
Group A Poster 271	EEII	Findings from a Decade of Ground Motion Simulation Validation Research and a Path Forward Sanaz Rezaeian, Jonathan Stewart, Nicolas Luco, Christine Goulet Simulated ground motions can advance seismic hazard and risk assessments and structural response analyses, particularly for conditions with limited recorded ground motions such as large magnitude earthquakes at short source-to-site distances.... more Themes: Ground Motion Simulation \| Probabilistic Seismic Hazard Analysis \| Risk to Distributed Infrastructure	21144
Group A Poster 081	Geodesy	Source Parameters of Recent Earthquakes from Sentinel-1 InSAR Data Karlee Rivera, Gareth Funning This study presents results of routine modeling of recent, moderate-sized earthquakes (5.6 ≤ M ≤ 6.6) with Sentinel-1 InSAR data. We process interferograms using the ISCE software, and downsample them using a quadtree decomposition. We model the... more Themes: Modeling Earthquake Source Processes
Group A Poster 179	FARM	Mesozoic fabric influence on the formation and geometry of the Quaternary Cucamonga Fault Francine Robles, Joshua Schwartz, Elena Miranda, Keith Klepeis, Gabriela Mora-Klepeis Ancient basement rocks in Southern California contain mechanical anisotropies that may influence the architecture of Quaternary faulting. We study exposed basement rocks found within the southeastern San Gabriel lithotectonic block with the... more	21140
Group B Poster 150	FARM	A probabilistic displacement hazard assessment framework for coseismic distributed fracturing from strike-slip earthquakes Alba Rodriguez Padilla, Michael Oskin Widespread distributed fracturing during earthquakes threatens infrastructure and lifelines. We combine high-resolution rupture maps from the four major surface-rupturing strike-slip earthquakes in southern California and northern Mexico since 1992... more Themes: Beyond Elasticity \| Probabilistic Seismic Hazard Analysis \| Risk to Distributed Infrastructure
Group A Poster 009	Seismology	Geometrical Properties of Seismicity in California Zachary Ross, Yehuda Ben-Zion, Ilya Zaliapin The spatial geometry of seismicity encodes information about loading and failure processes, as well as properties of the underlying fault structure. Traditional approaches to characterizing geometrical attributes of seismicity rely on assumed... more Themes: Community Models \| Data-Intensive Computing \| Beyond Far-Field Approximations
Talk Tue 0800	CEO	Open Access and Earthquake Science Christie Rowe In this talk I introduce the status of Open Access in our field as I understand it at present, relying on many recently published studies (reference list on last slide). I briefly introduce a new community- run Diamond Open Access Journal (seismica... more
Group B Poster 020	Seismology	Induced Seismicity in the Delaware Basin Justin Rubinstein Since 2015, the Permian Basin in southeastern New Mexico and western Texas has experienced a surge in seismicity that is continuing to rise. This seismicity is primarily caused by wastewater disposal, although earthquakes in some areas are being... more Themes: Induced Seismicity
Group B Poster 084	Geology	Impact of Rock Material on Precarious Rock Fragilities M. Khalid Saifullah, Christine Wittich Precariously Balanced Rocks (PBRs) are a type of naturally occurring freestanding structures that are important to test and constrain seismic hazard at longer return periods. The exposure ages of these rocks have been established to be between 10,... more Themes: Probabilistic Seismic Hazard Analysis	22152
Group A Poster 079	Geodesy	Maintaining and analyzing California-wide InSAR time-series, derived from the growing archive of ARIA standard products Simran Sangha, Gareth Funning, David Bekaert Interferometric Synthetic Aperture Radar (InSAR) is an established technique for mapping displacements of the Earth's surface. The Advanced Rapid Imaging and Analysis (ARIA) Center for Natural Hazards project provides open and free access to an... more Themes: Community Models \| Data-Intensive Computing \| Risk to Distributed Infrastructure	21035
Group A Poster 221	GM	Uncertainty in Ground-Motion-to-Intensity Conversions Significantly Affects Earthquake Early Warning Alert Regions Jessie Saunders, Annemarie Baltay, Maren Böse, Sarah Minson We examine how the choice of ground-motion-to-intensity conversion equations (GMICEs) in earthquake early warning (EEW) systems affects resulting alert regions. We find existing GMICEs developed for the United States can underestimate observed... more Themes: Earthquake Early Warning
Group B Poster 214	EFP	Modernizing CSEP experiments: The Floating Testing Center William Savran, José Bayona, Pablo Iturrieta, Khawaja Asim, Han Bao, Kirsty Bayliss, Marcus Herrmann, Danijel Schorlemmer, Philip Maechling, Maximilian Werner The Collaboratory for the Study of Earthquake Predictability (CSEP) is an open and international community whose mission is to accelerate earthquake predictability research through rigorous testing of probabilistic earthquake forecast models and... more Themes: Probabilistic Seismic Hazard Analysis \| Operational Earthquake Forecasting
Group B Poster 238	GM	Fault damage zone effects on near-field ground motion parameters and plastic strain in a multi-scale dynamic rupture model of the 2019 Ridgecrest sequence Nico Schliwa, Alice-Agnes Gabriel We analyze near-field ground motion parameters and plastic deformation of two multi-scale dynamic rupture models of the 2019 Ridgecrest sequence, including the Mw 6.4 Searles Valley foreshock, followed by the Mw 7.1 Ridgecrest mainshock 34 hours... more Themes: Beyond Elasticity \| Modeling Earthquake Source Processes \| Ground Motion Simulation
Group A Poster 201	EFP	Bayesian ETAS for Improved Earthquake Rate Models for the Pacific Northwest Max Schneider, Peter Guttorp, Nicholas van der Elst, Michael Barall, Andrew Michael, Jeanne Hardebeck, Morgan Page The Pacific Northwest (PNW) has substantial earthquake risk, both due to the Cascadia megathrust fault and other fault systems under the region’s population centers. Forecasts of aftershocks following future large earthquakes will thus be desirable... more Themes: Operational Earthquake Forecasting
Group C Poster 055	Seismology	Deep lower crustal seismicity and fabric in the Sierra Nevada: Implications for the fossil slab versus delamination debate Vera Schulte-Pelkum, Debi Kilb The Sierra Nevada and Great Valley are a non-deforming block within the transform plate boundary, but a debate remains about the relationship between uplift of the Sierra and deep structure including the high-velocity Isabella mantle anomaly. Here,... more Themes: Stress and Deformation Over Time \| Community Models \| Beyond Elasticity	21098, 22073
Group B Poster 104	Geology	Automating measurement of extensional fault/fold scarp geometry and resurfacing in Reykjanes, Iceland: Implications for fault scaling and growth Madeline Schwarz, Karl Mueller, Stephen Sheehan Evaluating the slip distribution along individual faults informs fault displacement hazard analyses by constraining the propagation history of active extensional fault systems. The abundance of high-resolution topographic data enables widespread... more Themes: Stress and Deformation Over Time \| Data-Intensive Computing \| Probabilistic Seismic Hazard Analysis
Group B Poster 074	Geodesy	Automated block closure and resolution tests in dense block models: preliminary results Jayson Sellars, Eileen Evans Block models, in which the seismogenic crust is divided into microplates bounded by faults, are a powerful tool for estimating fault slip rates from geodetic observations such as from the Global Navigation Satellite System (GNSS) and/or geologic... more Themes: Community Models
Group B Poster 262	CXM	Characterizing the lithosphere-asthenosphere boundary in southern and eastern California Beth Shallon, Heather Ford The thickness of the lithosphere in the western United States has been found to be thinner than that of the stable continental interior of North America. Explanations for this thin lithosphere range from active tectonics to the presence of partial... more Themes: Community Models
Group B Poster 046	Seismology	The variable continuous bimaterial interface in the San Jacinto fault zone revealed by dense seismic array analysis of fault zone head waves Pieter-Ewald Share, Frank Vernon, Yehuda Ben-Zion Key factors controlling earthquake ruptures include fault geometry, continuity and seismic velocity structure around the fault. We present a novel tool that better informs deep bimaterial fault geometry embedded in distributed damage and seismicity... more Themes: Community Models \| Modeling Earthquake Source Processes \| Ground Motion Simulation
Group B Poster 196	EFP	Magnitude and Slip Scaling Relations for Fault-Based Seismic Hazard Bruce Shaw Scaling relations play an important role in fault-based seismic haard, where slip rates on faults are balanced by cumulative slip in an earthquake rupture forecast. Here we discuss a series of issues which arise in constructing sets of logic tree... more Themes: Modeling Earthquake Source Processes \| Probabilistic Seismic Hazard Analysis	21086
Group A Poster 181	FARM	Displacement-Length Scaling of Resurfaced Normal Faults in Iceland and Implications for Fault Growth in Large Igneous Provinces Stephen Sheehan, Karl Mueller, Madeline Schwarz Faults are often conceptualized as elliptical planes propagating from a central nucleation point of rock shear failure. Maximum displacement velocity occurs at the nucleation point and gradually reduces to zero at the fault tips. A common method of... more Themes: Stress and Deformation Over Time \| Special Fault Study Areas: Focus on Earthquake Gates \| Community Models
Group B Poster 078	Geodesy	GNSS and InSAR Integration for 3-D Deformation Field in Southwestern US Zheng-Kang Shen, Zhen Liu We have developed a 3-dimensional (3-D) GNSS and InSAR integration algorithm, in which discrete GNSS data points are first interpolated to obtain a 3-D continuous velocity field and then combined with the InSAR line-of-sight (LOS) velocity data... more Themes: Community Models	22083, 22020
Group A Poster 001	Seismology	Revisiting the Ridgecrest aftershock catalog using a modified source-scanning algorithm applied to multiple dense local arrays Eyal Shimony, Asaf Inbal, Ariel Lellouch The two major Ridgecrest earthquakes of July 2019 were followed by numerous aftershocks. A temporary, spatially dense array was deployed over the summer of 2019 in order to monitor the aftershock activity. The array’s density and scale offer a... more Themes: Community Models \| Modeling Earthquake Source Processes
Group A Poster 243	GM	The SCEC Broadband Platform: Open-Source Software for Strong Ground Motion Simulation and Validation Fabio Silva, Philip Maechling, Christine Goulet The Southern California Earthquake Center (SCEC) Broadband Platform (BBP) is a collection of open-source scientific software modules that can simulate broadband (0-20+ Hz) ground motions for earthquakes at regional scales, compare simulation results... more Themes: Data-Intensive Computing \| Ground Motion Simulation \| Probabilistic Seismic Hazard Analysis	21110, 20163, 19130, 18146, 19079, 20114, 21115, 17149, 22118, 21080, 20205
Group A Poster 279	CEO	Utilizing A Geovisualization Platform By Way Of WebGIS As An Earthquake Hazard Educational Medium Sebastian Silva Communicating and educating the public on the urgency of earthquake preparedness is central to the promotion of best practices in the face of this ever present threat. This includes filling in the gap between a lack of educational materials and what... more Themes: Public Education and Preparedness \| Experiential Learning and Career Advancement
Group A Poster 069	Geodesy	The 2020 Westmorland, California earthquake swarm as aftershocks of a slow slip event sustained by fluid flow Krittanon Sirorattanakul, Zachary Ross, Mostafa Khoshmanesh, Elizabeth Cochran, Mateo Acosta, Jean-Philippe Avouac Swarms are bursts of earthquakes without an obvious mainshock. Some have been observed to be associated with aseismic transients, while others are thought to be related to fluids. However, the association is rarely quantitative due to insufficient... more Themes: Modeling Earthquake Source Processes
Group B Poster 066	Seismology	Testing Two New Features in ShakeAlert: Magnitude Weighting with Data Duration: 100km/5s Pause Radius for Ground Motions Deborah Smith, Jeff McGuire, Angie Lux In the ShakeAlert earthquake early warning system, our goal is to provide estimates of earthquake source parameters and resultant ground motions that are both as timely and accurate as possible. The overarching objective is to provide information... more Themes: Earthquake Early Warning
Group B Poster 144	FARM	Failure of sandstone with preexisting damage under dynamic tensile loading Zachary Smith, William Grifith Loading by earthquakes and alteration through heating and chemical processes can alter the physical properties of rocks and reduce their strength. During subsequent earthquakes altered rock may influence earthquake rupture processes. Heat treatments... more Themes: Stress and Deformation Over Time \| Beyond Elasticity \| Velocity and Rheology of Basin Sediments
Group B Poster 044	Seismology	Causes for continental lower-crustal and upper-mantle earthquakes inferred from Tibet Sn/Lg analysis Xiaohan Song, Simon Klemperer Almost all continental earthquakes nucleate in the crust. Claims of sub-Moho earthquakes in southern California (Inbal et al., Science, 2016) have recently been challenged with questions raised about depth uncertainties (Yang et al., Sci.Adv., 2021... more
Group A Poster 137	FARM	Invariance of Stress Drop Scaling for Slow Slip Events on Novel Laboratory Fault Will Steinhardt, Emily Brodsky, Sam Dillavou, Shmuel Rubinstein, Mary Agajanian Stress drop is a key seismological parameter for evaluating earthquakes, quantifying the change in stress on a fault due to a slip event. However, there is a fundamental discrepancy between the observed stress drop behavior of crustal earthquakes,... more Themes: Stress and Deformation Over Time \| Modeling Earthquake Source Processes
Group A Poster 195	EFP	Forecasting the 2016-2017 Central Apennines Earthquake Sequence with a Neural Marked Point Process Sam Stockman, Dan Lawson, Maximilian Werner Point processes have been the dominant way of modeling the evolution of seismicity for decades, with the Epidemic Type Aftershock Sequence (ETAS) model being the most popular. Recent advances in the field of machine learning have constructed highly... more Themes: Operational Earthquake Forecasting
Group B Poster 244	GM	San Diego Supercomputer Center: Translating Innovation into Practice Shawn Strande, Frank Wuerthewein, Ilkay Altintas, Amitava Majumdar, Yifeng Cui For more than 20 years, the San Diego Supercomputer Center (SDSC) has been a SCEC partner in supporting the earthquake simulations with high-performance computing (HPC) resources and computational expertise. The SCEC Board of Directors recently... more Themes: Ground Motion Simulation
Group B Poster 200	EFP	Hamlet: An Application for Seismic Hazard Model Evaluation and Testing Richard Styron, Yufang Rong, Kendra Johnson, Marco Pagani Although the desirability of evaluating the statistical performance of seismic hazard models is widely felt, the practice of such evaluations has remained limited. This is due to a variety of factors, including the limited data suitable for testing... more Themes: Probabilistic Seismic Hazard Analysis
Group A Poster 121	CS	Integration of Standalone CVM-H Basin Models into the Unified Community Velocity model(UCVM) Software Mei-Hui Su, Philip Maechling, Scott Callaghan, Andreas Plesch, John Shaw Several different seismic velocity models have been developed for California and the western United States and new models are under active development. While the geographic regions for these models may overlap, they are often defined for different... more Themes: Community Models
Group A Poster 257	SAFS	A correlation between the crystalline crust Vp/Vs and strain rates in Southern California and its implication on the fault system formation Siyuan Sui, Weisen Shen, William Holt, Jeonghyeop Kim The crustal deformation and its associated seismic hazards of Southern California have been under intense investigations. Among the investigations, seismic models that contain the elastic properties (e.g. compressional Vp and shear Vs seismic... more Themes: Stress and Deformation Over Time \| Community Models	20171, 21177

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