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 201-231 of 231

SCEC ID	Category	Title and Authors	SCEC Award
Group A Poster 121	FARM	Rupture segmentation on the East Anatolian Fault controlled by slip partitioning in a structurally complex fault system Binhao Wang, Sylvain Barbot The East Anatolian Fault, known for its historical large earthquakes, exhibits distinctive segmentation along its strike, typically resulting in moment magnitude (Mw) up to 7.5. However, on February 6, 2023, a catastrophic Mw 7.8 earthquake struck... more Themes: Special Fault Study Areas: Focus on Earthquake Gates \| Modeling Earthquake Source Processes \| Probabilistic Seismic Hazard Analysis
Group A Poster 099	FARM	Dynamic rupture simulation of caldera collapse earthquakes: evidence of temporally variable earthquake nucleation sites through the Kīlauea 2018 collapse sequence Taiyi Wang, Eric Dunham, Lukas Krenz, Lauren Abrahams, Paul Segall All instrumented caldera collapses at basaltic shield volcanoes generate Mw > 5 very long period (VLP) earthquakes. Due to the presence of magma chamber(s) beneath the caldera ring fault, the scaling of co-seismic slip for these earthquakes is... more Themes: Beyond Elasticity \| Modeling Earthquake Source Processes \| Beyond Far-Field Approximations
Talk Tue1500	CEO	Co-production of earthquake risk mitigation knowledge and practice Anne Wein The U.S. Geological Survey’s Science Application for Risk Reduction (SAFRR) project (formerly the Multi-Hazard Demonstration Project) developed scenarios for earthquakes (ShakeOut, HayWired), winter storm (ARkStorm) and tsunami (SAFRR Tsunami) with... more Themes: Risk to Distributed Infrastructure \| Public Education and Preparedness
Talk Sun1600	SAFS	How expanding SCEC and starting CRESCENT will accelerate our understanding of faulting and related hazards Ray Weldon Our knowledge of fault behavior and particularly its application to seismic hazards has been driven by the study of active faults in Southern California and the Basin and Range. While these regions provide tremendous insight they don’t capture the... more Themes: Probabilistic Seismic Hazard Analysis
Group B Poster 090	SAFS	Exploring the transition between the Parkfield and Cholame sections of the San Andreas Fault Alana Williams, Ramon Arrowsmith, Shreya Arora, Drew Cochran, Erik Jansen, Garrett Pontin, Caroline Friedman The southern San Andreas fault (SAF) has one of the most well developed paleoseismic records in the world, which provides key data for evaluating spatiotemporal models of earthquake rupture. The Cholame section of the SAF located in south-central... more Themes: Probabilistic Seismic Hazard Analysis	21136
Group A Poster 105	FARM	Near Source High-Frequency Ground Motions from Physics-based Dynamic Rupture Simulations Kyle Withers, Shuo Ma, Thomas Ulrich, Alice-Agnes Gabriel, Jean-Paul Ampuero, Elif Oral, Luis Dalguer, Yongfei Wang, Christine Goulet, Benchun Duan, Dunyu Liu, Domniki Asimaki In this project, we form a modeling group targeting improving methods of simulating earthquake ground motions for seismic hazard applications using dynamic rupture simulations. We aim to determine conditions that make broadband synthetic ground... more Themes: Ground Motion Simulation	23121
Group A Poster 027	Seismology	2022 MW5.0 Range Hill earthquake, Midland Bain; reactivation of Precambrian fault within Midland Basin Jeongung Woo, William Ellsworth Fluid injection and the resulting pore pressure changes during unconventional hydrocarbon development and production have caused an increased level of seismicity in many oil plays, including in the Midland Basin in west Texas. Precise determination... more Themes: Induced Seismicity
Group A Poster 113	FARM	Real area of contact as the state variable in rate-and-state friction Baoning Wu, Sylvain Barbot Rate- and state-dependent friction laws are commonly used to explain seismic observations in both laboratory and natural settings. However, the underlying physics of state dependence remains an active area of debate. We present a physical model that... more Themes: Modeling Earthquake Source Processes	22105
Group B Poster 168	GM	3D nonlinear multi-surface simulations of the 2020 Magna, UT, earthquake sequence Ke Xu, Kim Olsen The primary seismic hazard in the Salt Lake Valley, home to more than a million residents, is a large earthquake on the Wasatch fault. McCalpin and Nelson (2000) estimated the probability of an M7 earthquake occurring on the Salt Lake City Segment... more Themes: Community Models \| Ground Motion Simulation
Group B Poster 030	Seismology	The 2023 Mw7.8 Kahramanmaraş, Turkey Earthquake: A Multi-segment Rupture in Millennia Supercycle Liuwei Xu, Saeed Mohanna, Lingsen Meng, Chen Ji, Jean-Paul Ampuero, Zhang Yunjun, Masooma Hasnain, Risheng Chu, Cunren Liang An Mw 7.8 earthquake occurred on the East Anatolian Fault (EAF) and the secondary Narlı Fault (NF) on Feb 6, 2023, closely followed by an Mw 7.5 event on the Sürgü Fault 9 hours later. We analyze the distant and local seismic data, high-rate GNSS... more Themes: Modeling Earthquake Source Processes
Group B Poster 202	CXM	Mapping Los Angeles basin depth with converted seismic phases recorded by dense arrays Yan Yang, Robert Clayton The depth of the Los Angeles Basin, one of its least accurately determined attributes, holds significance for both tectonic studies and for defining the resonant period of the basin for site amplification – a key factor for the structural safety of... more Themes: Community Models \| Velocity and Rheology of Basin Sediments	22019, 23129
Group B Poster 078	Geology	Recent Creep and Structural Evolution of the San Gregorio Fault at Pillar Point, California Simone Yeager, Clarissa Smith, Patrick OConnor, Hudson Washburn, Tyler Ladinsky, Christie Rowe, Kimberly Blisniuk Here we summarize and characterize newly identiﬁed fault splay exposures of the San Gregorio Fault, collectively referred to as the Middle Strand. This inferred Middle Strand is exposed along a landslide headscarp more than 100 m in length and up to... more Themes: Stress and Deformation Over Time	22113
Group A Poster 167	GM	Calibration of near-surface velocities in the greater Los Angeles area Te-Yang Yeh, Kim Olsen The near-surface seismic structure (surface to about 1000 m depth), in particular the shear-wave speeds (Vs), has important implications for prediction of strong ground motions. In the SCEC CVM version CVM-S4.26.M01 (CVM-S hereafter), the shallow Vs... more Themes: Community Models \| Ground Motion Simulation
Group B Poster 126	FARM	Stress Transfer and Seismic Clustering in Complex Fault Systems: Insights from 3-D Earthquake Simulations Yi-Fan Yin Many recent earthquake sequences show how complex fault systems host clustered quakes of similar magnitudes. Clustered quakes can exacerbate the damaged buildings and add difficulty to hazard assessment based on isolated mainshocks. We know how... more Themes: Stress and Deformation Over Time
Group A Poster 011	Seismology	Distinct Aftershock Sequences of Moderate Magnitude Earthquakes Near the Mendocino Triple Junction in Northern California: 2021-12-20 Mw 6.1 and 6.0 Petrolia Sequence, and 2022-12-20 Mw 6.4 Ferndale Earthquake Clara Yoon, David Shelly The Mendocino Triple Junction (MTJ) in northern California, where subduction of the Gorda Plate beneath the North American Plate transitions into strike-slip motion along the San Andreas Fault, recently experienced three moderate magnitude strike-... more Themes: Data-Intensive Computing
Group B Poster 096	SAFS	High pore fluid pressure due to rapid sedimentation in the Salton Trough informed by the Fish Creek Vallecito Basin, California Elaine Young, Michael Oskin The Salton Trough is a seismically active region of southern California and northern Baja California characterized by several creeping strike-slip faults. High heat flow and overpressure conditions (pore fluid pressure in excess of hydrostatic or... more Themes: Stress and Deformation Over Time \| Modeling Earthquake Source Processes	23203
Group B Poster 010	Seismology	Using the Southern California Earthquake Data Center (SCEDC) and the Southern California Seismic Network (SCSN) Products and Services for Earthquake Research Ellen Yu, Prabha Acharya, Aparna Bhaskaran, Shang-Lin Chen, Gabrielle Tepp, Ettore Biondi, Marcos Alvarez, Zachary Ross, Allen Husker, Robert Clayton The Southern California Earthquake Data Center (SCEDC) is the primary archive for the Southern California Seismic Network, hosting its earthquake catalog (1932-present), and waveform archive. A copy of these assets is also available in the AWS cloud... more Themes: Data-Intensive Computing	23123
Group B Poster 036	Seismology	Evaluating Relative Relocation Methods in a Synthetic Setting: The Case of the 2019 Ridgecrest Earthquake Sequence Yifan Yu, William Ellsworth, Gregory Beroza Relative earthquake relocation algorithms, such as HypoDD (Waldhauser & Ellsworth, 2000) and GrowClust (Trugman & Shearer, 2017), have emerged as crucial tools for enhancing the accuracy and resolution of earthquake catalogs by reducing... more Themes: Modeling Earthquake Source Processes \| Post-Earthquake Rapid Response
Group B Poster 046	Seismology	The Effect of Stress and Friction Heterogeneity on Complexity of Seismic and Aseismic Slip on Strike-Slip Faults Jeena Yun, Yuri Fialko, Alice-Agnes Gabriel Numerical and laboratory models of earthquake cycles on faults governed by rate and state friction typically show a cycle-invariant behavior, while natural fault slip exhibits considerable variability. Possible explanations include heterogeneities... more Themes: Stress and Deformation Over Time \| Data-Intensive Computing \| Modeling Earthquake Source Processes	22135, 22162, 23121
Group B Poster 114	FARM	The effect of contact area distribution on the frictional properties of a modeled fault Jaiden Zak, Will Steinhardt, Emily Brodsky Frictional strength is controlled by the total real area of contact between surfaces. This fundamental tenet has been in place since the work of Bowden and Tabor and has motivated significant work measuring the topography of fault surfaces with an... more Themes: Modeling Earthquake Source Processes
Group A Poster 201	CXM	Lower Seismogenic Depth Model for Western U.S. Earthquakes Yuehua Zeng, Mark Petersen, Oliver Boyd We present a model of the lower seismogenic depth of earthquakes in the western United States (WUS) estimated using the hypocentral depths of events M>1, a crustal temperature model, and historical earthquake rupture depth models. Locations of... more Themes: Community Models \| Modeling Earthquake Source Processes \| Probabilistic Seismic Hazard Analysis
Group B Poster 180	GM	Investigation of Damage Potential of Ground Motions of the 6 February 2023 Pazarcik Turkey Earthquake by Developing Spatial Distribution of Inelastic Spectra Esra Zengin, Yousef Bozorgnia, Aidin Tamhidi, Silvia Mazzoni A devastating earthquake of magnitude 7.8 struck the southeastern part of Turkey on February 6, 2023 followed by a powerful aftershock magnitude 7.7. These earthquakes resulted in extensive damage across southern Turkey and northern Syria,... more Themes: Ground Motion Simulation \| Risk to Distributed Infrastructure
Group B Poster 052	Seismology	Comprehensive Evaluation of DAS Arrays in California: Instrument Response, Noise Level, and Amplitude Clipping Qiushi Zhai, Jiuxun Yin, Yan Yang, James Atterholt, Zhongwen Zhan Distributed acoustic sensing (DAS) is an emerging technology that converts optical fibers into dense arrays of strainmeters. However, the amplitudes in DAS recordings haven't been fully quantified, especially for pre-existing telecommunication... more
Group A Poster 005	Seismology	Enhancing regional seismic velocity model with higher-resolution local results using sparse dictionary learning Hao Zhang, Yehuda Ben-Zion We use sparse dictionary learning to develop transformations between seismic velocity models of different resolution and spatial extent. Starting with data in the common region of both models, the method can enhance a regional lower-resolution model... more Themes: Community Models \| Data-Intensive Computing \| Ground Motion Simulation
Group B Poster 044	Seismology	Tracking spatial and temporal variations of terrestrial water storage in central Oklahoma using ambient seismic noise Shuo Zhang, Bingxu Luo, Yehuda Ben-Zion, Yujie Zheng, David Lumley, Hejun Zhu Significant imbalances in terrestrial water storage (TWS) and severe drought have been observed around the world as a consequence of climate change. Improving our ability to monitor TWS and drought is critical for water-resource management and water... more Themes: Stress and Deformation Over Time \| Data-Intensive Computing \| Beyond Elasticity
Group A Poster 101	FARM	Dynamic Rupture Modeling in a Complex Fault Zone with Discrete and Distributed Damage Chunhui Zhao, Ahmed Elbanna, Yehuda Ben-Zion Active fault zones have complex structural and geometric features that are expected to affect earthquake nucleation, rupture propagation with shear and volumetric deformation, and arrest. Earthquakes, in turn, dynamically activate co-seismic off-... more Themes: Beyond Elasticity \| Modeling Earthquake Source Processes \| Ground Motion Simulation
Group A Poster 047	Seismology	A simulator of earthquakes and aseismic slip on a large heterogeneous strike-slip fault Xiaoyu Zhou, Yehuda Ben-Zion We develop an earthquake simulator for studying the dynamics of seismicity and seismic/aseismic slip partitioning on a heterogeneous strike-slip fault using a generalized version of a discrete fault governed by static/dynamic friction and creep in... more Themes: Stress and Deformation Over Time \| Modeling Earthquake Source Processes
Group A Poster 003	Seismology	High-Resolution Seismicity Imaging and Early Aftershock Migration of the 2023 Kahramanmaraş (SE Türkiye) Mw 7.9 & 7.8 Earthquake Doublet Yijian Zhou, Hongyang Ding, Abhijit Ghosh, Zengxi Ge, Xiaodong Song We build a high-resolution early aftershock catalog for the 2023 SE Türkiye seismic sequence with PALM, a seamless workflow that sequentially performs phase Picking, Association, Location, and Matched filter for continuous data. The catalog contains... more Themes: Beyond Far-Field Approximations \| Post-Earthquake Rapid Response
Group B Poster 004	Seismology	Fusion of Multiresolution Seismic Tomography Maps Using Physics-informed Probability Graphical Models Zheng Zhou, Kim Olsen, Peter Gerstoft The resolution of velocity models obtained by tomography varies due to multiple factors and variables, such as the inversion approach, ray coverage, data quality, etc. Fusing such tomography models with different resolutions is desired when updating... more Themes: Community Models	21133
Group A Poster 049	Seismology	Imaging the Northern Los Angeles Basins with Autocorrelations Caifeng Zou, Robert Clayton We use autocorrelations created from teleseismic waves and ambient noise to map the internal structure in the San Gabriel and San Bernardino, CA Basins. The causal side of the autocorrelation function of the transmission seismogram at a surface... more Themes: Velocity and Rheology of Basin Sediments
Group A Poster 071	Geology	Comparison of mapped fault locations based on geomorphic mapping from remote-sensing datasets Malinda Zuckerman, Chelsea Scott, Ramon Arrowsmith, Rachel Adam, Christopher Madugo, Rich Koehler, Albert Kottke Active fault mapping is critical to surface rupture hazard analysis and scientific study. Geologists commonly map active faults from remote sensing datasets by interpreting tectonic landforms formed from past earthquakes. However, evidence is not... more Themes: Risk to Distributed Infrastructure

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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