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 101-150 of 301

SCEC ID	Category	Title and Authors	SCEC Award
Talk Tue 0800	CS	Hackweeks: Promoting open science through participant-driven workshops Scott Henderson TBD
Group B Poster 174	FARM	The mechanics of rupture propagation through fault bends during strike-slip earthquakes Vanessa Herrera, Alba Rodriguez Padilla, Sophia White, Michael Oskin Fault bends, or changes in fault strike, can inhibit rupture propagation and thus exert a primary control on rupture length, and, consequently, the final size of the earthquake. Therefore, investigating the mechanics of rupture propagation through... more Themes: Special Fault Study Areas: Focus on Earthquake Gates \| Probabilistic Seismic Hazard Analysis \| Experiential Learning and Career Advancement
Group A Poster 255	SAFS	Large Events on the Southern San Andreas Fault Modulated by Lake Filling Events Ryley Hill, Matthew Weingarten, Thomas Rockwell, Yuri Fialko New geologic and paleoseismic data demonstrate that the past 6 major earthquakes on the Southern San Andreas Fault (SSAF) correlate with high-stands of the ancient Lake Cahuilla, a ~236 km3 body of water adjacent to the SSAF. To investigate the... more Themes: Stress and Deformation Over Time \| Data-Intensive Computing \| Induced Seismicity	21091
Talk Wed 1100	CS	Advances in Computational Seismology for California Earthquakes Evan Hirakawa In practice, seismic hazard analysis and structural engineering draw heavily on empirical relations derived from recorded shaking (i.e., ground motion prediction equations). However, these ground motion models are limited in that they usually only... more Themes: Community Models \| Data-Intensive Computing \| Ground Motion Simulation
Group B Poster 032	Seismology	FaultScan - Monitoring Body Wave Velocity Changes Across the San Jacinto Fault (2022-2025) Daniel Hollis, Frank Vernon, Florent Brenguier, Yehuda Ben-Zion, Quentin Higueret, Aurelien Mordret, Coralie Aubert, Yixiao Sheng University of Grenoble-Alpes, UC San Diego/IGPP and University of Southern California are collaborating on a three-year project to measure body wave velocity changes across the San Jacinto Fault. This project, named FaultScan, uses seismic noise... more Themes: Stress and Deformation Over Time \| Special Fault Study Areas: Focus on Earthquake Gates \| Modeling Earthquake Source Processes
Group B Poster 080	Geodesy	Joint Inversion of GNSS and InSAR Data for Continuous 3-D Velocity and Strain Rate Fields in Southern California William Holt, Jeonghyeop Kim, Mradula Vashishtha We develop a joint inversion algorithm for continuous surface 3-D velocities and associated horizontal strain rate fields. Using a thin-elastic-sheet model, we construct basis functions that represent a response to body-force equivalents embedded... more Themes: Stress and Deformation Over Time \| Community Models	22134
Group C Poster 007	Seismology	Earthquake Ruptures on Complex Fault Systems: Insights from Haiti Susan Hough, Stacey Martin, Steeve Symithe, Rich Briggs We review historically observed earthquakes in Haiti, which has experienced two M 7+ earthquakes in the 21st century and a series of large earthquakes in the 18th century. Detailed rupture processes can rarely be established for historic earthquakes... more Themes: Special Fault Study Areas: Focus on Earthquake Gates \| Modeling Earthquake Source Processes
Group B Poster 016	Seismology	Informative modes in the nearest-neighbor earthquake diagram Yu-Fang Hsu, Ilya Zaliapin, Yehuda Ben-Zion The nearest-neighbor analysis of seismicity (e.g., Zaliapin and Ben-Zion, J. Geophys. Res., 2013) has multiple applications including earthquake cluster detection and classification, catalog declustering, and induced seismicity characterization. It... more Themes: Induced Seismicity
Group A Poster 155	FARM	Seismicity Migration and a Surface Creep Event in 2021 on the Calaveras Fault Litong Huang, Susan Schwartz, Emily Brodsky Most surface creep events are thought to extend no deeper than 1-5km, but what possible relationship exists between surface creep and deeper geological processes remains unclear. Bilham et al. (SCEC poster 2021) reported a creep event on the... more Themes: Special Fault Study Areas: Focus on Earthquake Gates
Group A Poster 053	Seismology	Imaging the subsurface structures of the southern San Andreas fault using ambient noise and anthropogenic sources Shuye Huang, Haoran Meng, Yehuda Ben-Zion We present seismic imaging results for the subsurface structure (top ~100m) of the southern San Andreas Fault (SSAF) in the Coachella Valley. The results are based on ambient noise and signals generated by rail and road traffic, recorded by a 4-km... more
Group B Poster 022	Seismology	Dynamic stresses induced groundwater reductions observed within a fractured aquifer near Ash Meadows, Nevada associated with the 2019 Ridgecrest earthquake Ruei-Jiun Hung, Matthew Weingarten Groundwater observations in Ash Meadows, Nevada are dedicated to protect its unique ecosystem and to manage groundwater resources. The groundwater levels are sensitive to earth tides and earthquakes, allowing us to study dynamic hydrologic... more
Group B Poster 280	CEO	SEISMICA: a new diamond open-access journal built for—and by—the community to explore seismology, earthquakes, and related disciplines Tran Huynh, Matthew Agius, Quentin Brissaud, Jaime Convers, Ezgi Karasozen, Shiba Subedi The journal Seismica launched in July 2022 with a call for scientists to submit their research in seismology, earthquake science, and related disciplines. Seismica began in 2020 when a group of seismologists wanted to change scientific publishing in... more
Group B Poster 218	GM	Why (on Earth) should we measure 6 ground motion components … ? Heiner Igel, Felix Bernauer, Andreas Brotzer, Jean-Paul Montagner, Eleonore Stutzmann, Joachim Wassermann, Sabrina Keil, Le Tang, Shihao Yuan, Chun-Man Liao, Ernst Niederleithinger, Ulrich Schreiber … because a 6C point measurement (i.e., three components of translations, three components of rotations) acts like a classic seismic array with 3C sensors (thus interesting particularly in situations in which multiple sensors are difficult to... more Themes: Risk to Distributed Infrastructure \| Velocity and Rheology of Basin Sediments
Group B Poster 254	SAFS	Updated frictional behavior of San Andreas Fault gouges from plate-rate friction experiments Matt Ikari The San Andreas Fault is known for its large central creeping section separating locked, large earthquake-producing segments at its northern and southern ends. The San Andreas Fault Observatory at Depth (SAFOD) project has produced samples from two... more Themes: Stress and Deformation Over Time
Group B Poster 134	FARM	Cascading Foreshocks and Aftershocks in a Discrete Fault Network Kyungjae Im, Jean-Philippe Avouac Earthquakes come in clusters formed mostly of mainshock-aftershock sequences, including occasional foreshocks. This clustering is thought to result primarily from stress transfer among faults. Here, we analyze how the characteristics of foreshock... more Themes: Community Models \| Modeling Earthquake Source Processes \| Probabilistic Seismic Hazard Analysis
Group A Poster 031	Seismology	Invastigation of Parkfield tremor source properties using an array of tripartite seismic arrays Asaf Inbal Obtaining precise tremor locations and constraining tremor source properties is essential for understanding deep crustal faulting. Yet, the poor SNR and emergent nature of tremor puts this class of signals well beyond the reach of traditional... more Themes: Stress and Deformation Over Time \| Special Fault Study Areas: Focus on Earthquake Gates \| Modeling Earthquake Source Processes
Group B Poster 210	EFP	Accounting for earthquake rates’ variability through Uniform Rate Zone forecasts. Applications to the New Zealand Seismic Hazard Model update. Pablo Iturrieta, Matthew Gerstenberger, Chris Rollins, Russ Van Dissen, Ting Wang, Danijel Schorlemmer The distribution of earthquakes in time and space is seldom stationary. In low-seismicity regions, non-stationarity and data scarcity may preclude a significant statistical analysis. We investigate the performance of stationary Poisson forecasts (... more Themes: Probabilistic Seismic Hazard Analysis
Group A Poster 145	FARM	Nucleation and arrest of fluid-induced aseismic fault slip Antoine Jacquey, Robert Viesca Microseismicity associated with fluid pressurization in the subsurface occurs during fluid injection but can also trigger after injection shut-in. Understanding the extent and duration of the post-injection microseismicity is critical to limit the... more Themes: Stress and Deformation Over Time \| Beyond Elasticity \| Induced Seismicity	22142
Group A Poster 237	GM	Prediction of ground motion in South Korea based on physics-based broadband ground motion simulation Seokho Jeong, Sung Bae, Jae Hwi Kim, Kwangyoung Kim Korean peninsula is placed in a stable continental region (SCR). In an SCR, moderate to large earthquakes do not occur frequently. However, like many other places in SCRs, Korea has suffered from infrequent yet damaging earthquakes in the past.... more Themes: Ground Motion Simulation \| Probabilistic Seismic Hazard Analysis
Group A Poster 063	Seismology	Duration and dynamic stress drop during the initial rupture “breakaway” stage of Ridgecrest earthquakes Chen Ji It was well known that the initial rise of P wave velocity seismograms generated by earthquakes often starts with a relatively low rate for a short time before growing quickly in an approximately ramp-like shape (Iio, 1992; Ellsworth and Beroza,... more Themes: Stress and Deformation Over Time \| Modeling Earthquake Source Processes
Group A Poster 171	FARM	Community Code Veriﬁcation Exercises for Simulations of Sequences of Earthquakes and Aseismic Slip (SEAS): From 3D, Full Elastodynamics and Dipping Faults to Fluids and Fault Friction Evolution Junle Jiang, Valere Lambert, Brittany Erickson, Mohamed Abdelmeguid, Martin Almquist, Jean-Paul Ampuero, Ryosuke Ando, Sylvain Barbot, Camilla Cattania, Alexandre Chen, Luca Dal Zilio, Benchun Duan, Eric Dunham, Ahmed Elbanna, Alice-Agnes Gabriel, Tobias Harvey, Yihe Huang, Yoshihiro Kaneko, Jeremy Kozdon, Nadia Lapusta, Duo Li, Meng Li, Chao Liang, Dunyu Liu, Yajing Liu, So Ozawa, Casper Pranger, Paul Segall, Yudong Sun, Prithvi Thakur, Carsten Uphoff, Ylona van Dinther, Yuyun Yang Numerical simulations of sequences of earthquakes and aseismic slip (SEAS) have rapidly progressed over recent decades to address fundamental problems in earthquake physics and fault mechanics. Challenges in SEAS modeling remain in resolving the... more Themes: Stress and Deformation Over Time \| Community Models \| Modeling Earthquake Source Processes	19109, 20113, 21065, 22079
Group A Poster 105	Geology	Fault mapping in Trona, West Searles Valley, San Bernardino County, California as a result of the 2019 Trona-Ridgecrest Earthquake Sequence, Part 2 Frank Jordan, Jr., Miles Wagner The 2019 Trona-Ridgecrest Earthquake Sequence occurred primarily as a result of shallow fault rupture initially along the northeast-striking Salt Wells Valley Faults and subsequently along the northwest-striking Paxton Ranch Faults. However,... more Themes: Post-Earthquake Rapid Response
Group B Poster 096	Geology	Preliminary luminescence ages of offset and unfaulted alluvium along the Mission Creek strand Ayush Joshi, Nathan Brown, Seulgi Moon, Marina Argueta Whether or not the Mission Creek strand of the San Andreas fault was active in the late Pleistocene and Holocene is currently debated (Blisniuk et al., 2021; Yule et al., 2021). To investigate this issue, we estimate the depositional ages of... more Themes: Stress and Deformation Over Time \| Special Fault Study Areas: Focus on Earthquake Gates	22097
Group C Poster 029	Seismology	A semi-automated process to identify turbidity currents within the Cascadia Subduction Zone in Barkley Canyon Debi Kilb, Valerie Sahakian, Marcus Chaknova, Faabio De Leo, Maureen Walczak, Jenna Hill Seismic hazard estimates for the Cascadia Subduction Zone (CSZ) rely on moment rates estimated from geologic observations, including source characteristics derived from offshore turbidites. This assumes that shaking from CSZ earthquakes remobilizes... more
Group B Poster 182	FARM	Effect of Fluids on Friction Properties and Stability of Rock Gouge Taeho Kim, Nadia Lapusta, Daniel Faulkner, John Bedford Earthquake ruptures on pre-existing natural faults occur as shear deformation – or slip - in layers of fault gouge. The shear resistance of fault gouge to slip is a key ingredient in how the earthquake ruptures nucleate, propagate, and arrest. We... more Themes: Modeling Earthquake Source Processes
Group A Poster 099	Geology	Role of Confinement in Coseismic Pulverization: Testing the Rock Record of Rupture Directivity on the San Jacinto Fault Caje Kindred Weigandt, William Griffith, Thomas Rockwell Recent observations within Anza Borrego State Park, where the San Jacinto Fault juxtaposes Pleistocene Bautista Formation sediments against Cretaceous tonalite, display a stark contrast across the fault and at varying depths. In particular, while... more Themes: Beyond Elasticity	20027
Group B Poster 246	SAFS	Sedimentological evidence for a possible channel incision event in the Carrizo Plain, California: The 1861-1862 ARkStorm event? Matthew Kirby, Sinan Akciz, Joseph Carlin, Dahlia Serrato, Samuel Hippard Offset channels are routinely used to determine slip rates and slip-per-earthquake measurements. Plots showing the distribution of slip along the strike of a fault are used to infer the slip distribution during previous earthquakes and even... more	19170
Group A Poster 093	Geology	The Bonham Ranch fault, Nevada: paleoseismic observations along the eastern margin of the northern Walker Lane Rich Koehler The Bonham Ranch fault splays off the northwest trending Pyramid Lake fault (a major strike-slip fault of the northern Walker Lane) and extends north for >50 km along the western margin of Smoke Creek Desert, Nevada. In this area, approximately... more Themes: Community Models \| Probabilistic Seismic Hazard Analysis
Group B Poster 220	GM	The Community Seismic Network: Applications and Expansion to 1200 Stations Monica Kohler, Robert Clayton, Yousef Bozorgnia, Ertugrul Taciroglu, Richard Guy The Community Seismic Network (CSN) is a permanent, strong-motion sensor network that records and archives continuous waveform data. Earthquake, wind, and ambient vibration data are used in studies of basin velocity structure, geotechnical layer... more Themes: Post-Earthquake Rapid Response \| Risk to Distributed Infrastructure \| Velocity and Rheology of Basin Sediments
Group B Poster 228	GM	Broadband waveform simulations of earthquake scenarios in the Swiss Molasse basin using the BBP tool from SCEC Maria Koroni, Miroslav Hallo, Afifa Imtiaz, Donat Fäh Numerical modelling of strong ground motion is an essential part of understanding earthquake recordings and explaining processes that affect seismic wave propagation. Moreover, the prediction and modelling of strong ground motions is an important... more Themes: Ground Motion Simulation
Group A Poster 113	Geology	Clay mineral reactions at earthquake timescales Julia Krogh, Heather Savage, Randolph Williams, Christie Rowe Both long-term and transient fault strength are affected by the production and localization of frictionally weak phases, such as clays. Clay mineral alteration occurs in faults from fluid-rock interactions at geothermal temperatures over time.... more	21149
Talk Wed 0800	EFP	Simulating seismic activity at the Coso geothermal field Kayla Kroll It is understood that manipulation of the subsurface stress state by fluid injection or extraction can induce or possibly inhibit earthquake activity. In fact, it has been suggested that actively managing reservoir pressures via co-extraction of... more Themes: Induced Seismicity \| Operational Earthquake Forecasting
Group B Poster 276	CEO	From Bombay Beach to Carrizo Plain: Highlights from the first CERI San Andreas Field Trip, July 25-29, 2022 Christodoulos Kyriakopoulos, Thomas Goebel, Roshan Bhattarai, Kiran Pandey, Roshan Koirala, Luis Bazán Flores Here we are presenting a photographic diary of a five-day long (July 25-29, 2022) field trip along the Southern San Andreas Fault (SSAF) organized by the Center for Earthquake Research and Information (CERI) at the University of Memphis. We started... more Themes: Public Education and Preparedness \| Experiential Learning and Career Advancement
Group A Poster 161	FARM	Absolute stress levels in models of low-heat faults: Links to seismological observables and differences for crack-like ruptures and self-healing pulses Valere Lambert, Nadia Lapusta Determining absolute stress levels on faults has profound implications for fault mechanics and earthquake physics. Recent studies have shown that fault shear stress can depend on the style of fault motion and spatial scale at which the stress is... more Themes: Stress and Deformation Over Time \| Modeling Earthquake Source Processes	21106, 20080
Talk Wed 0800	FARM	Advancing models of earthquake source processes towards physics-informed seismic hazard assessment Valere Lambert Numerical models of earthquake source processes are continuously advancing to incorporate new physical factors - including fault geometry and roughness, shear heating and fluid effects, visco-plastic deformation, and off-fault damage/healing - in... more Themes: Community Models \| Modeling Earthquake Source Processes \| Probabilistic Seismic Hazard Analysis
Group B Poster 108	Geology	Evidence for late Holocene multi-fault rupture in the Panamint Valley transtensional relay, Eastern California Shear Zone (ECSZ) Aubrey LaPlante, Christine Regalla, Israporn Sethanant Several historic earthquakes in the Eastern California Shear Zone (ECSZ) have involved complex and multi-fault ruptures, but the fault geometries and background stress conditions that allow for strain transfer across multi-fault systems are still... more
Group B Poster 198	EFP	Testing earthquake recurrence models with paleoseismic time series Wing Yee Winnie Lau, Michael Oskin, Bruce Shaw We directly test earthquake recurrence models using long paleoseismic time series from California, augmented by long time series available from other areas of continental strike-slip faulting (e.g. China, Israel, and New Zealand). Testing how... more Themes: Probabilistic Seismic Hazard Analysis	22092
Group A Poster 229	GM	Development and Verification of Regression and Application Software Tools for Non-ergodic Ground-Motion Models Grigorios Lavrentiadis, Elnaz Seylabi, Nicolas Kuehn, Xiaofeng Meng, Albert Kottke, Yousef Bozorgnia, Christine Goulet Non-ergodic ground-motion models (NGMMs) are a promising development in probabilistic seismic hazard analysis (PSHA) as they have the potential of reducing the ground-motion aleatory variability. This reduction in aleatory variability is accompanied... more Themes: Probabilistic Seismic Hazard Analysis \| Risk to Distributed Infrastructure
Group A Poster 233	GM	Site Characterization Using Seismic Velocity Testing and its Incorporation into a Relational Database Jessica Ledesma, Tristan Buckreis, Jonathan Stewart Velocity data for any given site is a critical component for the prediction of earthquake ground motions used in design and construction of buildings and other structures. However, measurements of velocity data are not widely available or easily... more Themes: Community Models \| Data-Intensive Computing \| Risk to Distributed Infrastructure
Group B Poster 274	EEII	Impact of CyberShake on Risk Assessments for Distributed Infrastructure Systems Yajie Lee, Christine Goulet, ZhengHui Hu, Kevin Milner, Scott Callaghan Empirical ground motion models (GMMs) are typically used to quantify spatially correlated ground motion hazard in probabilistic seismic risk analysis (PSRA) for spatially distributed systems. They represent “average” source, path attenuation, and... more Themes: Ground Motion Simulation \| Probabilistic Seismic Hazard Analysis \| Risk to Distributed Infrastructure	20093, 22093
Group B Poster 006	Seismology	Daily and seasonal variations of shallow seismic velocities in southern California from analysis of H/V ratios and autocorrelations of seismic waveforms Guoliang Li, Yehuda Ben-Zion Various studies observed changes of seismic velocities related to earthquakes, volcanic processes and other loadings, focusing primarily on short term changes. Establishing a baseline of ongoing secular velocity changes from atmospheric temperature... more Themes: Stress and Deformation Over Time
Group A Poster 033	Seismology	The break of rupture asperities as resolved by distributed acoustic sensing Jiaxuan Li, Taeho Kim, Nadia Lapusta, Zhongwen Zhan, Ettore Biondi Back-projection of high-frequency teleseismic P waves improves our understanding of the temporal and spatial rupture evolution of large earthquakes. Yet, its application to moderate-sized earthquakes is rare since ultra-dense seismic arrays near... more Themes: Modeling Earthquake Source Processes
Group B Poster 052	Seismology	Study of Fault-Zone Damage and Heal: 30-Years Retrospective of the 1992 M7.4 Landers Earthquake and Numerical Tests of FZTWs from a Layered Fault Zone Yong-Gang Li We review our previous study of fault zone co-seismic damage and post-mainshock healing progressions on the 1992 M7.4 Landers rupture zone in California via observations and 3-D finite-difference modeling of fault-zone trapped waves (FZTWs)... more Themes: Stress and Deformation Over Time \| Beyond Elasticity \| Post-Earthquake Rapid Response
Group B Poster 190	SDOT	Detecting creep transients in InSAR timeseries using deep neural networks Yuexin Li, Roland Bürgmann, Gareth Funning Creeping faults in California exhibit both steady and episodic slow slip behaviors. Growing evidence indicates that shallow fault creep can be triggered by nearby or remote earthquakes, modulated by elevated pore pressure in the fault, and composed... more Themes: Stress and Deformation Over Time	22077
Group B Poster 264	CXM	Basic Data Properties and Preliminary Results from a Dense 3C Temporary Seismic Array across the Los Angeles Basin Fan-Chi Lin, Amir Allam, Heather Ford, Robert Clayton Targeting basin and blind fault structure, we conducted a month-long temporary seismic experiment across the Los Angeles basin in June 2022. The experiment includes a 200-station shotgun array covering the entire basin with ~4 km spacing, and two... more Themes: Community Models \| Velocity and Rheology of Basin Sediments	22128
Group B Poster 024	Seismology	High-Frequency Seismic Attenuation in Southern California: Does Elastic Scattering Dominate? Yu-Pin Lin, Thomas Jordan We measured high-frequency (1-10 Hz) spectral amplitudes of 29,023 P and 22,812 S crustal phases from Southern California earthquakes and separately inverted the two datasets for three-dimensional, frequency-dependent models of total attenuation.... more
Group B Poster 242	GM	Evolution of ground motion characteristics over earthquake cycle timescales Dunyu Liu, Yongfei Wang, Christine Goulet Dynamic rupture models provide a critical link between earthquake physics, velocity structures, and ground motion. This physics-based simulation approach is particularly valuable to assess potential near-fault broadband ground motions affected by a... more Themes: Stress and Deformation Over Time \| Modeling Earthquake Source Processes \| Ground Motion Simulation	22035
Group B Poster 140	FARM	Modeling intermittent laboratory earthquakes in fault gouge using rate-and-state friction with flash heating Shengduo Liu, Nadia Lapusta, Vito Rubino, Ares Rosakis Destructive earthquake ruptures on natural faults occur as dynamic slip in layers of a fine granular material known as the fault gouge. An experimental study of earthquake ruptures within a Homalite-100 interface with fault gouge material has... more Themes: Stress and Deformation Over Time \| Induced Seismicity	22067
Talk Tue 1400	FARM	Coupling between fault slip and fluids: the effect of poroelasticity and inelastic dilatancy Shengduo Liu, Elias Heimisson, Nadia Lapusta, John Rudnicki Slip on faults induces compression and dilation in the surrounding rock, which can interact with pore fluids, modify their pressure, and induce fluid flow; those fluid effects, in turn, modify fault shear resistance and affect the slip evolution.... more Themes: Stress and Deformation Over Time \| Induced Seismicity
Group A Poster 005	Seismology	In-situ Vp/Vs ratio reveals fault-zone material variation at the westernmost Gofar transform fault, East Pacific Rise Tianze Liu, Jianhua Gong, Wenyuan Fan, Guoqing Lin Ocean transform faults often generate characteristic earthquakes that repeatedly rupture the same fault patches. The westernmost Gofar transform fault quasi-periodically hosts ~M6 earthquakes every ~5 years, and microseismicity suggests that the... more Themes: Stress and Deformation Over Time

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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