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 1-50 of 301

SCEC ID	Category	Title and Authors	SCEC Award
Group B Poster 160	FARM	Modeling Sequence of Earthquakes and Aseismic Slip on Fault Step-Overs with Off-Fault Plasticity Mohamed Abdelmeguid, Md Shumon Mia, Ahmed Elbanna Fault step-overs are ubiquitously observed in on long strike-slip fault systems and are very likely to produce slip complexities through the interaction between nearby faults. However, resolving stress interactions among different fault segments... more Themes: Stress and Deformation Over Time \| Beyond Elasticity \| Modeling Earthquake Source Processes
Talk Tue 1400	FARM	Modeling co-evolution of slip and fault zones in a Sequence of Earthquakes and Aseismic Slip (SEAS) model with off-fault plasticity Mohamed Abdelmeguid, Md Shumon Mia, Ahmed Elbanna Geological and seismological observations of fault zones suggest the existence of a damaged core that has different properties from those of the surrounding host rock. However, modeling long term damage evolution within fault zones remains... more Themes: Stress and Deformation Over Time \| Beyond Elasticity \| Modeling Earthquake Source Processes
Group B Poster 062	Seismology	Stress drop estimation of aftershocks of the 2019 Ridgecrest earthquake using an EGF approach Rachel Abercrombie, Christine Ruhl, Peter Shearer The large uncertainties and scatter in stress drop estimates affect strong ground motion prediction and limit our understanding of the physics of earthquake rupture. Reasons for this including the simplifying assumptions concerning the source, path... more Themes: Modeling Earthquake Source Processes
Group B Poster 188	SDOT	Spatiotemporal variations of stress and strain in the crust near 2019 Ridgecrest Earthquake Sequence Niloufar Abolfathian, Eric Fielding We analyze 2 years postseismic deformation of the 2019 Mw 7.1 Ridgecrest earthquake sequence employing both seismic and geodetic data including InSAR and GPS. We use geodetic data to measure the postseismic surface deformation, and infer the... more Themes: Stress and Deformation Over Time
Group B Poster 204	EFP	Earthquake nucleation constrained from induced seismicity at Groningen: evidence that seasonal stress variations determine seismicity at the annual to multiannual time scale. Mateo Acosta, Jonathan Smith, Jean-Philippe Avouac Earthquake nucleation models can in principle be tested by analyzing the seismicity response to stress variations. We use this approach focusing on the case example of seismicity induced by gas extraction from the Groningen gas field. Stress-based... more Themes: Induced Seismicity
Group A Poster 111	Geology	Development of the Geomorphic Indicator Ranking System for pre-rupture fault mapping Rachel Adam, Chelsea Scott, Ramon Arrowsmith, Malinda Zuckerman, Christopher Madugo, Rich Koehler, Darryl Reano, Ozgur Kozaci Pre-rupture fault mapping in advance of major earthquakes is a tool used to characterize potential fault rupture hazard. Fault trace mapping is usually guided by geomorphic features that indicate prior tectonic disruption of the landscape.Geologists... more Themes: Probabilistic Seismic Hazard Analysis
Group A Poster 157	FARM	Effect of heterogeneity on complexity of earthquake sequences Mary Agajanian, Kavya Sudhir, Nadia Lapusta Understanding the consequences of heterogeneity on frictional interfaces on the resulting slip patterns is a challenging, highly nonlinear, and dynamic problem. Natural fault surfaces are rarely homogeneous and host a spectrum of slip behaviors... more Themes: Modeling Earthquake Source Processes	21106, 20080
Group A Poster 239	GM	Assessment of Western U.S. Empirical Basin Response for the 2023 Update of the National Seismic Hazard Model Sean Ahdi, Morgan Moschetti, Brad Aagaard, Oliver Boyd, Grace Parker, William Stephenson The United States Geological Survey (USGS) is undertaking a 50-state update to the National Seismic Hazard Model (NSHM) for 2023. We assess amplification of ground motion for local site conditions (shallow sediments) and regional basins (deeper... more Themes: Community Models \| Probabilistic Seismic Hazard Analysis \| Velocity and Rheology of Basin Sediments
Group A Poster 251	SAFS	Channel incision ages to the rescue: An improved age for the penultimate earthquake that ruptured the Carrizo Plain section of the southern San Andreas Fault Sinan Akciz, Lisa Grant Ludwig, Ramon Arrowsmith, Ed Rhodes A primary step toward assessing the time and size of future earthquakes is identifying earthquake recurrence patterns in the seismic record. Hazard analyses rely on geologic and geomorphic data when sufficiently long historical or instrumental... more	14198
Group A Poster 133	FARM	The effect of fluid pressurization on energy partitioning during the earthquake cycle maryam alghannam, hector gomez, ruben juanes During an earthquake, the potential energy stored in the Earth is released as frictional energy, fracture energy, and radiated energy in the form of seismic waves. The potential energy released is mainly comprised of elastic strain energy and... more Themes: Induced Seismicity
Group B Poster 176	FARM	The Effect of flash heating on earthquake sequences and ductile shear zone structure Kali Allison, Laurent Montesi High-velocity rock friction experiments demonstrate that at high slip velocities dynamic weakening processes are activated, causing the frictional resistance of faults to drop to very low values. This reduction in frictional resistance in turn... more Themes: Stress and Deformation Over Time \| Beyond Elasticity \| Modeling Earthquake Source Processes	21166
Group A Poster 141	FARM	Using Active Source Seismology to Image the Palos Verdes Fault Damage Zone as a Function of Distance, Depth, and Geology Travis Alongi, Emily Brodsky, Jared Kluesner, Daniel Brothers Fault damage zones provide a window into the non-elastic processes of an earthquake. Geological and seismic tomography methods have been unable to measure damage zones at depth with sufficient spatial sampling to evaluate the relative influence of... more Themes: Stress and Deformation Over Time \| Beyond Elasticity	22111
Group B Poster 252	SAFS	Estimating evolving tractions and uncertainties on the San Andreas and San Jacinto fault systems over the last ~1000 years Emery Anderson-Merritt, Michele Cooke Estimating the evolving state of stress in a fault system can help us constrain the conditions that may have generated previous ground-rupturing earthquakes, assess present-day fault tractions and their uncertainties, and constrain initial... more Themes: Stress and Deformation Over Time	22030
Group A Poster 107	Geology	Complex patterns of lateral strain transfer between the Ventura-Pitas Point and blind Southern San Cayetano faults, Ventura, Southern California Chris Anthonissen, Lee McAuliffe, Jessica Grenader, James Dolan, John Shaw, Judith Hubbard, Ed Rhodes, Thomas Pratt Continuously cored borehole data, cone-penetrometer tests (CPT) and seismic reflection data from several sites along the Ventura-Southern San Cayetano fault system allow us to document lateral changes in slip rate and strain transfer between these... more Themes: Stress and Deformation Over Time \| Probabilistic Seismic Hazard Analysis
Group A Poster 247	SAFS	Constraining the long-term sedimentation history at ancient Lake Cahuilla, Coachella, CA from Holocene sediment cores Marina Argueta, Sourav Saha, Seulgi Moon, Nathan Brown, Thomas Rockwell, Katherine Scharer, Zoe Morgan, Jenifer Leidelmeijer The southernmost ~100 km of the southern San Andreas fault (SSAF) has an average ground-rupturing earthquake recurrence interval of ~200 years over the last 1000 years based on published paleoseismic studies. However, the most recent ground-... more Themes: Stress and Deformation Over Time \| Beyond Elasticity	21100, 20144, 22065
Group B Poster 148	FARM	Evaluating high spatial resolution zircon (U-Th)/He thermochronometry as a fault slip paleothermometer Emma Armstrong, Alexis Ault Zircon (U-Th)/He (ZHe) thermochronometry has the potential to detect and quantify temperature rise during earthquake slip. Theoretically, He diffusion is sensitive to short-duration, high temperatures. Recently published, SCEC-supported work... more Themes: Stress and Deformation Over Time	20153
Group A Poster 227	GM	Ground Motion Synthesis via Generative Adversarial Network Operators: A Paradigm Shift from Simulated Broadband Ground Motions? Domniki Asimaki, Yaozhong Shi, Grigorios Lavrentiadis, Zachary Ross We present a novel approach for developing on-demand synthetic ground motions for engineering applications. Leveraging the increase of ground-motion data from seismic networks, the availability of physics-based ground motion simulations, and recent... more Themes: Ground Motion Simulation \| Probabilistic Seismic Hazard Analysis \| Risk to Distributed Infrastructure	21074
Talk Sun 1600	GM	Past and future directions in ground motion modeling and seismic hazard analysis: Themes from the Hotel California Gail Atkinson From a dark desert highway, towards a shimmering light, we journey through past and future directions in ground motion modeling and seismic hazard analysis. Ground motion models (GMMs) prescribe the distribution of ground motions that is associated... more Themes: Ground Motion Simulation \| Probabilistic Seismic Hazard Analysis
Group B Poster 050	Seismology	Imaging the Garlock Fault Zone using distributed acoustic sensing James Atterholt, Zhongwen Zhan, Yan Yang Multi-scale fault zone structure largely controls the behavior of earthquake ruptures and encodes the long-term displacement history of the fault. Detailed images of subsurface fault zone structure fill an observational gap between surface mapping... more Themes: Stress and Deformation Over Time \| Risk to Distributed Infrastructure
Group B Poster 146	FARM	Shallow, transient slow slip in the southern San Andreas fault system: insights from natural and experimental hematite and hematite-clay slip surfaces Alexis Ault, Alexandra DiMonte, Jordan Jensen, Greg Hirth, Cameron Meyers, Kelly Bradbury Documenting modes of past deformation in exhumed fault rocks and comparison of natural and experimental faults are required to constrain the rheology and distribution of slip that occurs in the shallow crust during the modern earthquake cycle. Our... more Themes: Stress and Deformation Over Time \| Beyond Elasticity	21068, 22082
Group B Poster 206	EFP	Stress-Based and Convolutional Forecasting of Injection-Induced Seismicity: Application to the Helsinki Geothermal Reservoir Stimulation Jean-Philippe Avouac, Taeho Kim Induced seismicity observed during Enhanced Geothermal Stimulation (EGS) near Helsinki, Finland is modelled. A physical model is built upon stress evolution due to pore pressure diffusion and earthquake nucleation assumed either instantaneous or... more Themes: Induced Seismicity \| Operational Earthquake Forecasting
Group A Poster 269	CXM	Constraining the SCEC community rheology model with seasonal hydrologic loading and surface deformation phase shifts Curtis Baden, Baptiste Rousset, Kristel Chanard, Luce Fleitout, Roland Bürgmann The rheology of Earth’s crust and upper mantle influences the distribution and magnitude of deformation at Earth’s surface in response to both tectonic and non-tectonic processes. Existing constraints on Earth’s lithospheric rheology largely arise... more Themes: Community Models \| Beyond Elasticity	21053
Talk Mon 1400	SAFS	A Few Good Bends: Bridging earthquakes and mountain building along the Santa Cruz Mountains Restraining Bend in northern California Curtis Baden, David Shuster, Felipe Aron, Julie Fosdick, Roland Bürgmann, George Hilley Relative crustal motions along active faults generate earthquakes, and repeated earthquake cycles build mountain ranges over millions of years. However, the long-term summation of elastic, earthquake-related deformation cannot produce the... more Themes: Stress and Deformation Over Time \| Beyond Elasticity	17241
Group A Poster 147	FARM	Friction is independent of time and contact area in quartz Nir Badt, David Goldsby, Christopher Walker, George Pharr Friction between two rock surfaces in slide-hold-slide (SHS) experiments has been shown to increase with the duration of hold time, where the surfaces are held in stationary or quasi-stationary contact prior to re-sliding. Rock analogues demonstrate... more Themes: Stress and Deformation Over Time \| Modeling Earthquake Source Processes
Group B Poster 012	Seismology	The SCEC/USGS Community Stress Drop Validation TAG using the 2019 Ridgecrest Earthquake Sequence Data Annemarie Baltay, Shanna Chu, Rachel Abercrombie, Taka'aki Taira We present earthquake stress drop comparisons from the SCEC/USGS community stress drop validation study using the 2019 Ridgecrest earthquake sequence, in which researchers are invited to use a common dataset to estimate earthquake stress drop. We... more Themes: Stress and Deformation Over Time \| Modeling Earthquake Source Processes \| Ground Motion Simulation	21083, 21114, 22101, 22042
Group A Poster 159	FARM	Multi-scale flash-weakening incorporating inhomogeneous normal stress in high-velocity friction experiments on granite Monica Barbery, Frederick Chester, Judith Chester Models for flash heating and weakening show good overall agreement with results from high-velocity friction experiments, however transient and hysteretic friction exists. We previously documented inhomogeneous surface temperature (T) on sliding... more Themes: Stress and Deformation Over Time \| Beyond Elasticity \| Modeling Earthquake Source Processes	21095
Group A Poster 127	FARM	A rate-, state-, and temperature-dependent friction law with competing healing mechanisms Sylvain Barbot The constitutive behavior of faults is central to many interconnected aspects of earthquake science, from fault dynamics to induced seismicity, to seismic hazards characterization. Yet, a friction law applicable to the range of temperatures found in... more Themes: Stress and Deformation Over Time \| Modeling Earthquake Source Processes
Group B Poster 106	Geology	On the interaction of active faults and bedrock landslides Nicolas Barth Active faults often create topography, reduce rock strength, and generate ground shaking that contribute to an abundance of co-located bedrock landslides. Landslides, particularly bedrock slumps and rock avalanches, can bury the surface expression... more Themes: Stress and Deformation Over Time \| Community Models \| Probabilistic Seismic Hazard Analysis
Group A Poster 241	GM	Fourier-Based Site Response of Southern California Sedimentary Basins Jeff Bayless, Jonathan Stewart, Chukwuebuka Nweke, Scott Condon This ongoing study updates the Bayless and Abrahamson (2019; BA19) ground motion model for Fourier Amplitude Spectra (FAS) by incorporating two frequency-dependent site amplification model components, both regionalized for southern California. The... more Themes: Probabilistic Seismic Hazard Analysis	21143
Group A Poster 205	EFP	Are Regionally Calibrated Seismicity Models more Informative than Global Models? Insights from California, New Zealand, and Italy José Bayona, William Savran, Pablo Iturrieta, Matthew Gerstenberger, Warner Marzocchi, Danijel Schorlemmer, Maximilian Werner Earthquake forecasting models express a wide range of hypotheses about seismogenesis that underpin regional and global seismic hazard assessments. Until recently, comparisons between global and regional models remained largely qualitative and... more Themes: Community Models \| Probabilistic Seismic Hazard Analysis \| Operational Earthquake Forecasting
Group B Poster 178	FARM	Exploring the Dynamic Interactions Between the Southern San Andreas Fault and Normal Faults under the Salton Sea Luis Bazán Flores, Christodoulos Kyriakopoulos, David Oglesby, Aron Meltzner, Thomas Rockwell, John Fletcher, Daniel Brothers The generation of large earthquakes along the Southern San Andreas Fault (SSAF) depends on different fault-rupture parameters. Of particular importance is the initiation phase and the triggering of the SSAF by adjacent smaller faults that in some... more Themes: Modeling Earthquake Source Processes	22153
Talk	CEO	State of SCEC from the Director Yehuda Ben-Zion SCEC Director's yearly State of SCEC address.
Talk	CEO	Community, Education, and Outreach (CEO) Highlights Mark Benthien Highlights of the work of the Community, Education, and Outreach (CEO) team. Themes: Public Education and Preparedness \| Experiential Learning and Career Advancement
Group B Poster 158	FARM	Experimentally Observed Strength Evolution in Rate and State Friction is Much Better Fit With a Slip Formulation Than an Aging Formulation Pathikrit Bhattacharya, Allan Rubin, Terry Tullis, N. Beeler, Keishi Okazaki Nearly all frictional interfaces strengthen as the logarithm of time when sliding at ultralow speeds. Observations of also logarithmic-in-time growth of interfacial contact area under such conditions have led to constitutive models that assume that... more
Group A Poster 199	EFP	Physical models for the California transform fault system rupture hiatus and their conditional probability consequences Glenn Biasi, Katherine Scharer The paleoseismic records included in UCERF3 on main transform faults of California have an unusual quality of lacking paleoseismic surface rupturing events in over 100 years. The “transform fault system” (TFS) includes most of the highest slip... more Themes: Stress and Deformation Over Time \| Probabilistic Seismic Hazard Analysis
Group A Poster 175	FARM	How off-fault damage and splay faulting modulate shallow deformation in extensional detachment systems: new insights from 3D dynamic rupture simulations James Biemiller, Alice-Agnes Gabriel, Thomas Ulrich Despite their apparent misorientation to regional tectonic stresses, normal-sense detachment faults dipping < 30° are globally common structures that can help accommodate kilometers of crustal extension. Recent paleoseismic, geodetic,... more Themes: Stress and Deformation Over Time \| Beyond Elasticity \| Modeling Earthquake Source Processes
Group B Poster 040	Seismology	Preliminary study of precursor and scattered waves imaging of ambient noise cross-correlations from the Seal Beach dense array Ettore Biondi, Robert Clayton Seismic noise cross-correlations (CCs) can provide important information about the subsurface; especially, when constructed using dense station arrays. In these virtual Green’s functions, multiple arrivals, such as direct arrivals, body waves,... more Themes: Velocity and Rheology of Basin Sediments
Talk Wed 1100	Seismology	Challenges, opportunities, and discoveries using large-scale distributed acoustic sensing arrays Ettore Biondi, Yan Yang, Jiaqi Fang, Jiuxun Yin, Weiqiang Zhu, Jiaxuan Li, Ethan Williams, Zhongwen Zhan In recent years, distributed acoustic sensing (DAS) is demonstrating to be an effective tool when applied for seismological purposes and the number of its applications is rapidly growing. DAS can turn ordinary telecommunication fibers into large-... more Themes: Data-Intensive Computing
Group B Poster 212	EFP	Spatio-temporal clustering of earthquakes: Comparative analysis of marginal vs. coupled components in different regions Natalie Bladis, Ilya Zaliapin Earthquake clustering is a fundamental component of seismicity that reflects various forms of earthquake triggering mechanisms. Zaliapin and Ben-Zion (SRL, 2021) introduced a simple and robust measure of space-time clustering, using the receiver... more Themes: Probabilistic Seismic Hazard Analysis	22090
Group B Poster 128	FARM	Effect of off-fault plasticity on the dynamics of elongated earthquake ruptures Ekaterina Bolotskaya, Jean-Paul Ampuero Large earthquakes saturate the seismogenic width of the fault zone and propagate laterally, developing elongated pulse-like ruptures with large length‐to‐width ratios. Smaller earthquakes can also propagate in a width-bound regime due to... more Themes: Beyond Elasticity \| Modeling Earthquake Source Processes
Group A Poster 039	Seismology	Update on the California Strong Motion Instrumentation Program’s Progress toward Real Time Data Acquisition Dave Branum, Hamid HADDADI The California Strong Motion Instrumentation Program (CSMIP) network of over 1350 seismic stations has been a predominately triggered system where segments of strong motion data are only sent into the CSMIP server after shaking at a station exceeds... more Themes: Earthquake Early Warning
Group A Poster 153	FARM	Measuring vertical displacements from the 2019 Ridgecrest Earthquakes using the post-event lidar point cloud Guadalupe Bravo, Alba Rodriguez Padilla, Michael Oskin Measuring vertical displacements from strike-slip earthquakes remains challenging as the vertical motion is small and most geodetic methods are not well suited to measure displacement in the vertical direction in the near field. Here we measure the... more Themes: Post-Earthquake Rapid Response
Group B Poster 098	Geology	Luminescence thermochronology reveals Late Pleistocene exhumation history near the Mill Creek strand of the San Andreas fault Nathan Brown, Marina Argueta, Seulgi Moon, Ed Rhodes, Michael Oskin, Alex Morelan Recent work suggests that the Mill Creek, Galena Peak, and Mission Creek strands of the southern San Andreas fault system near the southern San Bernardino Mountains may have been active in the late Pleistocene and Holocene with implication for... more Themes: Stress and Deformation Over Time \| Special Fault Study Areas: Focus on Earthquake Gates
Group B Poster 112	Geology	Slip-History for the past 3-4 earthquakes on the central Garlock Fault, Mojave Desert, California James Burns, Sally McGill, Kerry Cato, James Dolan, Ed Rhodes, Sourav Saha, Seth Saludez, Andrew Suarez As part of a larger project, we are contributing to the construction of a detailed slip history of the Garlock fault, by dating geomorphic features that have been offset ~3 to ~24 meters, to estimate the amount of slip in the past 1-4 earthquakes on... more Themes: Stress and Deformation Over Time
Group B Poster 240	GM	Updates to the CyberShake PSHA Platform Scott Callaghan, Philip Maechling, Fabio Silva, Christine Goulet, Kevin Milner, Bruce Shaw, Kim Olsen, Te-Yang Yeh, Robert Graves, Karan Vahi, Ewa Deelman, Albert Kottke, Thomas Jordan, Yehuda Ben-Zion The CyberShake platform performs physics-based probabilistic seismic hazard analysis (PSHA) using 3D wave propagation simulations with reciprocity. We describe here our recent CyberShake work to calculate the first fully-deterministic CyberShake... more Themes: Ground Motion Simulation \| Probabilistic Seismic Hazard Analysis
Group A Poster 191	SDOT	Instantaneous stress state of the lithosphere of Southern California: A synthesis of geophysical and compositional products of SCEC Lajhon Campbell, Siyuan Sui, Alireza Bahadori, Weisen Shen, William Holt The southern California region is defined by complex seismotectonics in which there is an equally complex stress state that is yet to be fully understood. Our goal is to build a geodynamic framework that quantifies the instantaneous stress state of... more Themes: Stress and Deformation Over Time \| Data-Intensive Computing	20171, 21177
Group A Poster 245	SAFS	Prehistoric earthquakes on the Banning strand of the San Andreas fault, North Palm Springs, California Bryan Castillo, Sally McGill, Katherine Scharer, Doug Yule, Devin McPhillips, James McNeil, Sourav Saha, Nathan Brown, Seulgi Moon We studied a paleoseismic trench excavated in 2017 across the Banning strand of the San Andreas fault and herein provide the first detailed record of ground-breaking earthquakes on this important fault in Southern California. The trench exposed an ~... more Themes: Special Fault Study Areas: Focus on Earthquake Gates
Group A Poster 003	Seismology	Seismicity in the Gulf of California, México, Before and After the El Mayor-Cucapah (Mw7.2) Earthquake of April 2010 Raul Castro, Dana Carciumaru, Hector Gonzalez-Huizar, William Vetel, Antonio Mendoza, Arturo Pérez-Vertti We analyze the seismicity that occurred in the Gulf of California, México previous and after the occurrence of the 2010 El Mayor-Cucapah (Mw7.2) earthquake. For that purpose, we compile a catalog of earthquakes located in the region of the Gulf of... more Themes: Stress and Deformation Over Time \| Special Fault Study Areas: Focus on Earthquake Gates \| Induced Seismicity
Group B Poster 270	EEII	Recorded Earthquake Response of the new Self Anchored Suspension (SAS) Bridge of the San Francisco Bay Bridge System Mehmet Celebi I analyze the seismic performance of the Self Anchored Suspension (SAS) Bridge of the San Francisco Bay Bridge System by evaluating response data recording during the October 14, 2019 Mw4.6 Pleasant Hill earthquake (www.stronmotioncenter.org) and by... more
Group A Poster 219	GM	Which earthquakes are the most damaging? An examination of community-collected ‘Did You Feel It’ data in California, USA Jenna Chaffeur, Sarah Minson, Jessie Saunders, Annemarie Baltay, Susan Hough, Elizabeth Cochran, Sara McBride, Vince Quitoriano, Luke Blair ‘When will I feel the big one?’ is a question that earthquake scientists are all too familiar with. But while waiting for the big one to occur, people will experience several smaller magnitude earthquakes. The combination of ground motion... more Themes: Ground Motion Simulation \| Risk to Distributed Infrastructure \| Public Education and Preparedness

The Southern 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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