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 231

SCEC ID	Category	Title and Authors	SCEC Award
Group A Poster 145	SDOT	Ongoing development of PyLith version 3: New features, additional examples, and current priorities Brad Aagaard, Matthew Knepley, Charles Williams, Robert Walker We give an overview of recently added features and examples along with future development priorities of the open-source crustal deformation modeling code PyLith. PyLith focuses on solving earthquake faulting-related partial differential equations,... more Themes: Stress and Deformation Over Time
Group B Poster 034	Seismology	Revealing the Dynamics and Episodic Supershear in the Feb 6th 2023 M7.8 Kahramanmaraş/Pazarcik Earthquake: near-field records and dynamic rupture modeling Mohamed Abdelmeguid, Chunhui Zhao, Esref Yalcinkaya, George Gazetas, Ahmed Elbanna, Ares Rosakis The 2023 M7.8 Kahramanmaraş/Pazarcik earthquake was unfortunately larger and more destructive than what had been expected. Thanks to a dense array of instrumentation from AFAD, we have a unique dataset for that earthquake that is available for... more Themes: Modeling Earthquake Source Processes \| Ground Motion Simulation
Group A Poster 029	Seismology	Update on the International SCEC/USGS Community Stress Drop Validation Study Rachel Abercrombie, Annemarie Baltay, Shanna Chu, Taka'aki Taira In 2021 we launched the Community Stress Drop Validation Study, focused on the 2019 Ridgecrest earthquake, California, sequence, using a common dataset. The broad aim of the collaboration is to improve the quality of estimates of stress drop and... more Themes: Modeling Earthquake Source Processes	22101, 22042, 23108, 23107
Group B Poster 156	EFP	Earthquake nucleation characteristics revealed by the effect of short-and-long-term stress variations on induced seismicity. Mateo Acosta, Jean-Philippe Avouac, Jonathan Smith, Krittanon Sirorattanakul, Hojjat Kaveh, Stephen Bourne Deterministic earthquake prediction remains elusive, but time-dependent probabilistic seismicity forecasting seems within reach thanks to the development of physics-based models relating seismicity to stress changes. Challenges include constraining... more Themes: Modeling Earthquake Source Processes \| Induced Seismicity \| Operational Earthquake Forecasting
Group B Poster 076	Geology	Assessing a systematic geomorphic mapping approach to improve confidence in fault mapping and rupture prediction Rachel Adam, Chelsea Scott, Ramon Arrowsmith, Darryl Reano, Christopher Madugo, Rich Koehler, Malinda Zuckerman, Brian Gray, Ozgur Kozaci, Tania Gonzalez, Hans AbramsonWard, Thomas Rockwell, Eldon Gath, Albert Kottke, Ethan Luechter Accurate fault maps are an important component in the assessment of fault displacement hazard. Different mapping techniques, biases, and ambiguous geomorphic evidence for faulting can drive even expert mappers to produce different fault maps. There... more Themes: Special Fault Study Areas: Focus on Earthquake Gates \| Risk to Distributed Infrastructure
Group B Poster 110	FARM	Supershear transition of earthquake rupture on 3D faults with compact heterogeneity Mary Agajanian, Nadia Lapusta Ruptures with intersonic speeds (“supershear”) have been observed both experimentally and in the field. Supershear ruptures have characteristic Mach fronts that may carry large shaking velocities far from the fault. Thus, such ruptures can have more... more Themes: Modeling Earthquake Source Processes	22067, 23130
Group B Poster 012	Seismology	Seismic Phase Picking at Regional Distances Albert Aguilar, Gregory Beroza We present SKYNET, a set of deep learning models, combining convolutional and recurrent neural networks for picking seismic phase arrivals for earthquakes at distances up to 20 degrees of source-receiver separation. Our models were trained on the... more Themes: Data-Intensive Computing
Group B Poster 190	GM	Empirical Assessment of Site and Basin Response in the Pacific Northwest via Testing Site-Response Models for Different Tectonic Regimes Sean Ahdi, Brad Aagaard, Morgan Moschetti, Oliver Boyd, Grace Parker, William Stephenson We test the hypothesis that site-response models are independent of earthquake source parameters by analyzing ground-motion records in the Portland, Oregon, region. We assess whether empirical site-response models developed for subduction-zone... more Themes: Probabilistic Seismic Hazard Analysis \| Velocity and Rheology of Basin Sediments
Group A Poster 199	CXM	3D full waveform inversion of the Salton Seismic Imaging Project active source dataset Rasheed Ajala, Patricia Persaud, Folarin Kolawole High-frequency (>1 Hz) structural imaging is a long-term challenge the community must address to advance earthquake science and better understand crustal deformation processes. Developing automated tomography tools and deploying dense seismic... more Themes: Community Models \| Ground Motion Simulation \| Velocity and Rheology of Basin Sediments	23178, 21059
Talk Mon0800	Geology	Looking beyond the Great Southern California Shakeout: The February 06, 2023 Kahramanmaraş earthquake sequence reminds us to expect the unexpected Sinan Akciz, Cengiz Zabcı The 6 February 2023 Kahramanmaraş earthquake sequence generated significant shaking and damage throughout southeastern Turkey and Syria, a region known for its historical large earthquakes. The sequence started with an Mw7.0 on a 20-km long... more Themes: Post-Earthquake Rapid Response \| Public Education and Preparedness
Group B Poster 088	SAFS	Seismic reflection profiles and gravity observations on the southern segment of the Imperial fault Young Ho Aladro Chio, Mario González Escobar, Carlos Reyes Martínez Mapping faults is a vital part of seismic risk assessment. In northern Baja California, the Mexicali Valley is a seismically active region in which the Cerro Prieto and Imperial transform faults draw the main tectonic boundary at this latitude. Here... more Themes: Community Models
Group A Poster 211	CS	Dependence of rupture nucleation and propagation on fluid injection rate: effective stress vs. variations in friction properties maryam alghannam, Stacy Larochelle, Nadia Lapusta, Vito Rubino, Krittanon Sirorattanakul, Attilio Lattanzi, Ares Rosakis 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: Induced Seismicity	22067, 23130
Group A Poster 131	FARM	What Controls the Shallow Fault Damage Zone and Fluid Flow? Insights from New High-Resolution Seismic Imaging Travis Alongi, Emily Brodsky, Jared Kluesner, Daniel Brothers The distribution and intensity of fault damage zones provide insight into the inelastic response of Earth to strain. Presently, measures of the in-situ distribution of fault damage remain limited and, in particular, connecting surficial features to... more Themes: Stress and Deformation Over Time \| Beyond Elasticity \| Beyond Far-Field Approximations	22111
Group A Poster 093	SAFS	Estimating stress state along the San Jacinto and southern San Andreas faults on the eve of past ground-rupturing earthquakes Emery Anderson-Merritt, Michele Cooke, Katherine Scharer Estimating the evolving state of stress in a fault system can help us constrain the conditions that may have generated previous ground-rupturing earthquakes and provide initial conditions for dynamic rupture models of large earthquakes. We use... more Themes: Stress and Deformation Over Time	22030, 23104
Group A Poster 107	FARM	A systematic method to develop dynamic earthquake rupture scenarios: A case study on the Wenchuan–Maoxian Fault in the Longmen Shan, China, thrust belt Ryosuke Ando, Rongjiang Tang The 2008 Wenchuan Mw 7.9 mainshock caused catastrophic destruction to cities along the northwestern margin of the Sichuan Basin. This earthquake did not activate the Wenchuan–Maoxian Fault (WMF) on the hinterland side and the conjugate buried Lixian... more Themes: Modeling Earthquake Source Processes
Group A Poster 085	Geology	Dating of alluvial fans by surface reflectance imaged with AVIRIS and EMIT spectroscopy Chris Anthonissen, Robert Zinke, James Dolan Alluvial fans are sediment deposits found throughout arid regions, and are commonly used to measure and date past movements of earthquake faults. Offsets of these fan surfaces are readily measured, while the dating of these fans, using methods like... more
Group A Poster 051	Seismology	The top-to-bottom structure of the Garlock Fault Zone uncovered with fiber sensing James Atterholt, Zhongwen Zhan, Yan Yang, Weiqiang Zhu The structure of fault zones and the ruptures they host are inextricably linked. Fault zones are narrow, which has made imaging their structure at seismogenic depths a persistent problem. Fiber-optic seismology allows for low-maintenance, long-term... more
Group B Poster 130	FARM	The 2023 Kahramanmaraş, Turkey, earthquake sequence surface ruptures modified multi-earthquake cycle fault damage and spring hydrology Alexis Ault, Sinan Akciz, Dennis Newell, Musa Balkaya, Alexandra DiMonte, Greg Hirth, Cengiz Zabcı How do the mechanical, thermochemical, and hydrologic properties of near-surface fault rocks sustain or arrest earthquake ruptures? Addressing this question informs insitu earthquake rupture processes and controls on strong ground motions. New... more Themes: Stress and Deformation Over Time \| Beyond Elasticity	23081
Group A Poster 155	EFP	Factors Controlling the Rate and Magnitudes of Injection-Induced Earthquakes Jean-Philippe Avouac, Taeho Kim Advancements in operations central to the world’s transition to a greener economy such as geothermal energy are hampered by a lack of understanding and control of the maximum magnitude event that orders immediate suspension of all operations.... more Themes: Induced Seismicity \| Probabilistic Seismic Hazard Analysis \| Operational Earthquake Forecasting
Group A Poster 147	SDOT	Mountain ranges surrounding bends in strike-slip faults reveal fault strength Curtis Baden, Johanna Nevitt, George Hilley Frictional fault strength limits the accumulation of stress in the surrounding crust, but this strength is difficult to measure along natural fault systems. Around contractional bends in strike-slip faults, or restraining bends, the concentration of... more Themes: Stress and Deformation Over Time \| Beyond Elasticity
Group B Poster 082	Geology	What can clay minerals tell us about fault mechanics and deformation during the earthquake cycle? Insights from the Hidden Spring fault Lydia Bailey, Alexis Ault, Sidney Hemming, Alexandra DiMonte, Greg Hirth Clay minerals are common constituents of fault damage and govern the frictional strength, slip stability, permeability network of fault zones, and commonly exhibit velocity strengthening behavior. K-Ar geochronology of illite from fault gouge is... more Themes: Stress and Deformation Over Time \| Probabilistic Seismic Hazard Analysis
Group A Poster 129	FARM	Constitutive behavior of rocks during the seismic cycle Sylvain Barbot Establishing a constitutive law for fault friction is a crucial objective of earthquake science. However, the complex frictional behavior of natural and synthetic gouges in laboratory experiments eludes explanations. Here, we present a constitutive... more Themes: Stress and Deformation Over Time \| Beyond Elasticity
Group A Poster 177	GM	Informing Rupture Directivity Modeling with CyberShake Simulations Jeff Bayless, Norman Abrahamson In this study, a database of near-fault CyberShake simulations, consisting of many earthquake sources with multiple hypocenters and rupture realizations, is used to evaluate rupture directivity effects in the simulated ground motions. CyberShake... more Themes: Ground Motion Simulation \| Probabilistic Seismic Hazard Analysis	21143
Group B Poster 152	EFP	A Decade of Prospective Evaluations of One-Day Seismicity Forecasts for California: First Results José Bayona, Marcus Herrmann, William Savran, Fabio Silva, Philip Maechling, Warner Marzocchi, Maximilian Werner Since 2007, the Collaboratory for the Study of Earthquake Predictability (CSEP) has been prospectively evaluating 24-hour seismicity forecasting models for California to address seismological questions with important implications for time-dependent... more Themes: Community Models \| Data-Intensive Computing \| Operational Earthquake Forecasting
Group B Poster 108	FARM	Normal Fault Displacement History Provides Clues on Ruptures Along the Southern San Andreas Fault 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) is of major interest for the scientific community. Of particular interest is the initiation phase and the triggering of the SSAF by adjacent smaller faults that might... 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 Mon1300	Seismology	Coupled Evolution of Earthquakes, Faults, and Seismic Motion Yehuda Ben-Zion Natural faults have ubiquitous geometrical irregularities that produce high off-fault stresses, which generate rock damage (reduced elastic moduli) that modify properties of earthquake ruptures and seismic radiation, which modify in a feedback loop... more Themes: Beyond Elasticity \| Modeling Earthquake Source Processes \| Beyond Far-Field Approximations
Talk Sun1400	CEO	Community, Education, and Outreach (CEO) Highlights Mark Benthien, Gabriela Noriega Highlights of the work of the Community, Education, and Outreach (CEO) team.
Talk Sun1400	CEO	SCEC Sponsor Remarks Michael Blanpied, Albert Kottke, Kevin Reath, Jose Lara Agency representatives provide their perspectives on future directions relevant to the SCEC community.
Talk Tue1500	SAFS	New fault strands and slip rates on faults of the northern San Andreas Fault System: implications on kinematic and earthquake probability models for California Kimberly Blisniuk The location and geometry of faults (fault models) and the rate of which a fault slips (deformation models) are first order inputs for earthquake probability models. However, these data can be challenging to obtain in northern California because... more
Group A Poster 143	FARM	Variation of Fault Creep Along the Overdue Istanbul-Marmara Seismic Gap in NW Türkiye Marco Bohnhoff, Dirk Becker, Patricia Martínez-Garzón, Christopher Wollin, Tugbay Kilic Strain energy from tectonic loading can be partly released through aseismic creep. Earthquake repeaters, repeatedly activated brittle fault patches surrounded by creep, indicate steady-state creep that affects the amount of seismic energy available... more Themes: Stress and Deformation Over Time \| Special Fault Study Areas: Focus on Earthquake Gates \| Probabilistic Seismic Hazard Analysis
Group B Poster 148	SDOT	Correlation between creep and acoustic emission during earthquake preparation Nikita Bondarenko, Roman Makhnenko, Yury Podladchikov The processes occurring during the earthquake preparation and nucleation cannot be captured by elastic- perfectly plastic constitutive models that neglect features of material behavior at subcritical stress. Additional work is required to take into... more Themes: Stress and Deformation Over Time \| Beyond Elasticity \| Velocity and Rheology of Basin Sediments	22151
Group A Poster 181	GM	A California state-wide seismic velocity model extracted from the USGS National Crustal Model Oliver Boyd, Robert Graves, Evan Hirakawa The U.S. Geological Survey National Crustal Model (NCM) is being developed to improve estimates of site effects in seismic hazard assessments. Primary outputs of the NCM are continuous velocity and density profiles from the Earth’s surface to the... more Themes: Ground Motion Simulation \| Velocity and Rheology of Basin Sediments
Group A Poster 043	Seismology	Deep seismic velocity changes following the 2019 Ridgecrest earthquake 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: Stress and Deformation Over Time \| Beyond Elasticity \| Velocity and Rheology of Basin Sediments
Group B Poster 212	CS	Recent Enhancements to the CyberShake PSHA Platform Scott Callaghan, Philip Maechling, Fabio Silva, Kevin Milner, Kim Olsen, Robert Graves, Christine Goulet, Karan Vahi, Ewa Deelman, Albert Kottke, Yifeng Cui, Thomas Jordan, Yehuda Ben-Zion The SCEC CyberShake platform performs physics-based probabilistic seismic hazard analysis using 3D wave propagation simulations with reciprocity to produce a rich suite of site-specific and regional hazard data products. We highlight two recent... more Themes: Probabilistic Seismic Hazard Analysis	22102
Group B Poster 040	Seismology	Temporal Variation of S-Wave Attenuation During the 2009 L’Aquila, Central Italy, Seismic Sequence Raul Castro, Leonardo Colavitti, Francesca Pacor, Giovanni Lanzano, Sara Sgobba, Daniele Spallarossa We investigate possible variations of the spectral decay parameter kappa before and after the April 6, 2009, L’Aquila earthquake (Mw 6.1), central Italy. For this purpose, we analyze foreshocks that occurred 10 days before and groups of aftershocks... more Themes: Special Fault Study Areas: Focus on Earthquake Gates \| Modeling Earthquake Source Processes
Group B Poster 188	GM	Studying overturning and large displacement processes of precariously balanced rocks for ground motion estimation Zhiang Chen, Ramon Arrowsmith, Jnaneshwar Das, Christine Wittich, Christopher Madugo, Albert Kottke Studying the overturning and large-displacement processes of precariously balanced rocks (PBRs) facilitates ground motion estimation. Using a physics engine and robotic tools, we developed a virtual shake robot (VSR) to simulate the dynamics of PBRs... more Themes: Probabilistic Seismic Hazard Analysis
Group A Poster 213	CS	Numerical modeling of ground surface rupture in large thrust and reverse fault earthquakes: An example from the Cucamonga fault, southern California Kristen Chiama, Robb Moss, James Dolan, John Shaw We aim to develop a mechanical basis for understanding ground surface deformation that occurs during large thrust and reverse fault earthquakes, with a particular emphasis on past and future events in southern California. Active thrust faults pose... more Themes: Risk to Distributed Infrastructure	22013
Group A Poster 209	CS	Quakeworx – A New Science Gateway Framework For Earthquake Simulations Amit Chourasia, Philip Maechling, Subhash Ramesh, David May, Ahmed Elbanna, Alice-Agnes Gabriel, Yehuda Ben-Zion We are building a new science gateway framework for the earthquake science and related communities, with anticipated funding from the NSF-CSSI program, that will unify computational, data-driven and observational approaches, provide access to... more Themes: Community Models \| Data-Intensive Computing \| Operational Earthquake Forecasting
Group A Poster 035	Seismology	The effect of azimuthal variation on measured stress drop: a case study of the 2019 Ridgecrest sequence Shanna Chu, Annemarie Baltay, Rachel Abercrombie A longstanding issue in source seismology is whether or not the variation in measured “stress drop” is due to methodological differences or physical assumptions, which leads to confounding results about predicted ground motion in regional... more Themes: Modeling Earthquake Source Processes \| Ground Motion Simulation
Group B Poster 136	FARM	Non-linear stability analysis of slip in a single-degree-of-freedom elastic system with different frictional evolution laws Federico Ciardo, Robert Viesca Pioneer work on stability of steady sliding to infinitesimal perturbations in a spring-block model with rate- and state-dependent friction showed there exists a critical stiffness below which the block would be unstable to perturbations [Rice and... more Themes: Stress and Deformation Over Time \| Community Models \| Modeling Earthquake Source Processes
Group A Poster 007	Seismology	Community Seismic Network (CSN): A 1200-station permanent array in Los Angeles Robert Clayton, Monica Kohler, Yousef Bozorgnia, Ertugrul Taciroglu, Richard Guy The Community Seismic Network (CSN) has completed it expansion to cover all the schools in the Los Angeles Unified School District (LAUSD). This brings the network to over 1200 permanent 3-component accelerometers that report in near-real-time to... more Themes: Community Models \| Ground Motion Simulation \| Post-Earthquake Rapid Response
Group B Poster 170	GM	Performance of the GRAPES EEW Algorithm on the 2019 M7.1 Ridgecrest Earthquake Tim Clements, Elizabeth Cochran, Annemarie Baltay, Sarah Minson, Clara Yoon The goal of Earthquake Early Warning (EEW) is to characterize when and where strong ground motion is expected as soon as possible after an earthquake starts. The EEW systems currently in use across the world, such as ShakeAlert or the Japan... more Themes: Data-Intensive Computing \| Earthquake Early Warning
Group B Poster 018	Seismology	Densifying station coverage in remote locations with low-cost sensors Elizabeth Cochran, Benjamin Brooks, Julian Bunn, Tim Clements, Chris Duncan, Todd Ericksen, Graham Kent, Adam Ringler, Seth Saltiel Sparse station coverage dramatically reduces the ability of earthquake early warning systems, such as the ShakeAlert system in the United States, to rapidly detect and accurately characterize earthquakes to issue alerts to regional populations.... more Themes: Earthquake Early Warning
Group B Poster 048	Seismology	How robust are repeating earthquake detections? A comparison of different detection strategies Norma Contreras, Gareth Funning, Taka'aki Taira, Nader Shakibay Senobari Repeating earthquakes (‘repeaters’) are sequences of periodic or near-periodic collocated earthquakes that produce nearly identical waveforms. Repeaters are commonly found on, and associated with, regions of creep (aseismic slip) on a fault, and can... more Themes: Stress and Deformation Over Time \| Special Fault Study Areas: Focus on Earthquake Gates
Group A Poster 159	EFP	Aftershock forecasting in Hawai`i: accounting for a complex mix of tectonic and magmatic processes. Olana Costa, Andrew Michael Earthquake aftershock forecasts serve to relay situational awareness of the probability of experiencing aftershocks to the public, emergency managers, and other people who make decisions about response and recovery activities. Currently, the U.S.... more Themes: Operational Earthquake Forecasting \| Post-Earthquake Rapid Response
Group A Poster 127	FARM	Decoding 3D Geometry's Role in Earthquake Cycles: Application to the Central Chile subduction zone Jorge Crempien, Marco Herrera, Marcos Moreno, José Cembrano Earthquakes exhibit complex rupture patterns and variable sizes along fault segments. Understanding rupture segmentation and predicting large quake frequencies is vital for hazard assessment. This study focuses on the impact of plate interface... more Themes: Stress and Deformation Over Time
Group B Poster 208	CS	Progress of porting AWP-ODC to next generation HPC architectures and a 4-Hz Iwan-type nonlinear dynamic simulation of the ShakeOut scenario on TACC Frontera Yifeng Cui, Daniel Roten, Akash Palla, Anish Govind, Scott Callaghan, Mattew Norman, Lars Koesterke, Wenyang Zhang, Philip Maechling AWP-ODC is a 4th-order finite difference code used by the SCEC community for linear wave propagation, Iwan-type nonlinear dynamic rupture and wave propagation, and Strain Green Tensor simulation. We have ported and verified the CUDA-version of AWP-... more Themes: Beyond Elasticity \| Ground Motion Simulation \| Probabilistic Seismic Hazard Analysis
Group B Poster 166	EFP	A global survey of short term slow slip events and its influence on crustal earthquakes Kelian Dascher-Cousineau, Roland Bürgmann Slow slip events, unfolding over days to years, have been proposed to mediate stress transfer and earthquake nucleation. This study systematically analyzes the relationship between slow slip events and seismicity. We aggregate a comprehensive global... more Themes: Stress and Deformation Over Time \| Modeling Earthquake Source Processes \| Operational Earthquake Forecasting
Group B Poster 216	CEO	High-Performance Seismology CyberTraining (HPS) 2023: Data Science and HPC Marine Denolle, Alice-Agnes Gabriel, Yinzhi Wang, Yiyu Ni, Congcong Yuan, Pablo Iturrieta, José Bayona, Fabio Silva, Mei-Hui Su, Philip Maechling, Scott Callaghan, Rob Fatland, Naomi Alterman, Sebastian Wolf, Nico Schliwa, Dave May, Chenxiao Wang, Carl Tape, Bryant Chow We present the development of an advanced-seismology training curriculum (https://seisscoped.org/HPS/) to train researchers in advanced skills in data processing, numerical methods, and parallel computing. We developed teaching materials and... more Themes: Data-Intensive Computing \| Experiential Learning and Career Advancement	22162

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.

Category:
Theme:
Author:
Title:
Abstract:
Format:
Poster Group

Meeting Abstracts

IMPORTANT DATES

For Researchers

For The Media