Meeting Abstracts

The Statewide California Earthquake Center (SCEC) collaborates with academic, government, industry, and other organizations to advance earthquake science, community resilience, and education by: (1) Gathering and analyzing data from field observations and laboratory experiments. (2) Developing system-level models and simulations of earthquake processes to synthesize knowledge as a physics-based understanding of seismic hazard. (3) Communicating that understanding to expand knowledge and reduce earthquake risk.

SCEC Annual Meeting participants are invited to share recent results and activities relevant to SCEC priorities and initiatives during the poster sessions.

Results 101-150 of 244

SCEC ID	Category	Title and Authors	SCEC Award
Group A Poster 177	GM	Interpolation Methods for CyberShake Seismic Hazard Analysis Data Products Amelia Kratzer, Kevin Milner, Scott Callaghan CyberShake is an HPC platform that performs physics-based probabilistic seismic hazard analysis using wave propagation simulations. CyberShake results enable improved earthquake risk assessment and mitigation strategies, but they are very... more Themes: Advanced Modeling Frameworks \| Research Computing
Group B Poster 060	SDOT	What Does the Discrepancy Between Seismicity Rate and Strain Rate Tell Us About the Seismogenic Properties of the San Andreas Fault System? Corné Kreemer, Daniel Trugman, Yehuda Ben-Zion Spatial variations in the rate of background seismicity are assumed to be controlled primarily by stress concentrations produced by deformation rates, approximated by geodetic strain rates. However, we recently identified an important unexplained... more Themes: Improving Predictive Analyses of Seismicity	24169
Group A Poster 155	FARM	Frictional properties of locked and creeping strands in the northern transition region of the San Andreas Fault Julia Krogh, Heather Savage, Emily Brodsky, Craig Ulrich, Yves Guglielmi The San Andreas Fault is functionally divided into three regions: the northern and southern locked sections, which are capable of producing large earthquakes, and the middle creeping section. One possible mechanism for stable behavior in the central... more Themes: Improving Observations and Closing Data Gaps	24164
Group A Poster 097	Geology	Testing the potential for static triggering of Holocene earthquakes on faults in the Panamint and Searles Valleys, northern ECSZ Aubrey LaPlante, Christine Regalla The occurrence of several multifault or triggered earthquakes in the Eastern California Shear Zone (ECSZ) within the last ~30 years suggests that complex or triggered rupture may be common in this region. However, the fault geometries and background... more	23105
Talk Wed0800	SDOT	17 years of hydrology-driven geodetic deformation in California’s Sacramento Valley Stacy Larochelle Water mass transfers near the Earth’s surface, whether due to natural hydrologic processes or human activity, can deform the lithosphere and interact with fault systems. Characterizing how the solid Earth responds to these forcings provides crucial... more Themes: Improving Observations and Closing Data Gaps \| Developing Rheologies and Bridging Multi-Scales
Group B Poster 228	CEM	Multi-parameter thermal model of California and Nevada: Insights into crustal rheology and earthquake processes along the active transtensional plate boundary Terry Lee, Andrew Zuza, Daniel Trugman, Dominik Vlaha, Wenrong Cao The thermal state of the crust exerts a substantial control on its rheological and deformational properties. Elucidating the crustal thermal architecture can provide insights into the distribution and pattern of seismicity, seismic hazards, mid-... more Themes: Developing Rheologies and Bridging Multi-Scales \| Advanced Modeling Frameworks	24026
Group B Poster 028	Seismology	Deep learning-enhanced catalog of microseismicity in The Geysers geothermal field Lei Li, Ian McBrearty, Xing Tan, William Ellsworth, Gregory Beroza Induced seismicity monitoring with local and dense arrays has shown great potential for fine-scale fracture/fault characterization, constraining mechanisms of earthquake triggering, and for seismic risk management. The Geysers geothermal field in... more Themes: Improving Observations and Closing Data Gaps
Group A Poster 133	FARM	Effects of Bulk Poroelasticity on Repeating Earthquakes: Implications from Numerical Modeling Linxuan Li, Nadia Lapusta Most earthquake source studies ignore poroelastic effects activated by fault slip, in which bulk pore-fluid pressure (PFP) evolves due to shear-induced volumetric strain changes. We employ a spectral boundary integration method (Heimisson et al.,... more Themes: Advanced Modeling Frameworks
Group A Poster 039	Seismology	Numerical Investigations of Waveguide Effects for Multi-Layer Fault Damage Zones at Seismogenic Depths Yong-Gang Li Actual fault zones composed by damaged rocks with varying lithology at depths might form a multiple layered low-velocity waveguide (LVWG). 3-D finite-difference synthetic fault-zone trapped waves (FZTWs) in terms of a multi-layer LVWG show multiple... more Themes: Improving Observations and Closing Data Gaps
Group B Poster 072	SDOT	Earthquake pump as an elevator for microbiomes in the accretionary prisms of subduction zones Zhengze Li, Sylvain Barbot, Karen Lloyd The change in atmospheric composition during the Great Oxidation Event paved the way for the most dramatic episodes of climate change in Earth’s history. Extreme glaciation periods, known as "Snowball Earth" events, challenged Proterozoic... more Themes: Developing Rheologies and Bridging Multi-Scales \| Advanced Modeling Frameworks \| Research Computing
Group A Poster 045	Seismology	Seismic Imaging of the Salt Lake Basin through Joint Inversion of Receiver Functions and Rayleigh wave Ellipticity Fan-Chi Lin, HyeJeong Kim, James Pechmann, Adam McKean, Christian Hardwick The Wasatch Front has the potential to generate large-magnitude, damaging earthquakes. Salt Lake City, the capital and most populous city of Utah, and its surrounding area are particularly prone to earthquake hazards due to the slow-velocity... more Themes: Improving Observations and Closing Data Gaps
Group B Poster 086	Geodesy	Estimating the surface creep rate of the central San Andreas fault from a 3D surface velocity field derived from UAVSAR and Sentinel-1 data Li-Chieh Lin, Gareth Funning Fault creep, as opposed to fault locking, refers to the stable movement across the fault interface without storing elastic strain energy. Fault patches which exhibit such creeping behaviors are considered to have lower seismic potential due to their... more Themes: Improving Observations and Closing Data Gaps
Group A Poster 079	Geodesy	On decadal changes in fault behavior in Northern California Danielle Lindsay, Taka'aki Taira, Roland Bürgmann Understanding where creep occurs and how creep rates change through time is integral to determining seismic potential and constraining future earthquake scenarios. We utilize a repeating micro-earthquake catalog and surface creep rates from recent... more Themes: Improving Observations and Closing Data Gaps
Group B Poster 122	FARM	Mechanics of large earthquakes and seismic swarms at oceanic transforms controlled by hydrothermal alteration Mingqi Liu, Sylvain Barbot The generation of earthquakes is influenced by the thermo-mechanical and structural properties of fault zones. However, the lithological and hydrothermal controls on the style and size of ruptures and their recurrence patterns are still poorly... more Themes: Advanced Modeling Frameworks \| Improving Predictive Analyses of Seismicity
Group A Poster 201	EFP	Progress in long-term earthquake prediction in China Qi Liu, Zhigang Shao, Wuxing Wang, Lingyun Ji, Fuqiang Shi, Feng Long, Hui Zhang, Peng Wang Earthquake disasters are one of the most severe natural disasters. The basic national conditions of earthquake disasters in China are characterized by a high frequency, high intensity, wide distribution, and severe damage. Therefore, the research on... more Themes: Improving Predictive Analyses of Seismicity \| Applied Science Implementation \| Research Computing
Group A Poster 099	Geology	Application of photogrammetry to produce pre-urbanized DEMs of metropolitan areas: Uncovering a major new dextral fault system in San Diego, CA Wolfgang Lopez, Karl Mueller Seismic hazard assessment in densely urbanized regions is inherently more challenging and often more costly than in similar, undisturbed landscapes. This is particularly true for strike-slip faults with little surface expression due to low vertical... more Themes: Improving Observations and Closing Data Gaps \| Advanced Modeling Frameworks \| Applied Science Implementation
Group B Poster 154	FARM	When and where does aseismic creep stop rupture propagation? Julian Lozos Aseismic creep on faults is characterized by rate-strengthening friction, which means that the fault actively resists movement as slip rates increase. This resistance to coseismic rupture velocities approaching from adjacent locked fault sections... more Themes: Advanced Modeling Frameworks \| Improving Predictive Analyses of Seismicity	24201
Group A Poster 225	CEM	Toward a Statewide Community Model for Stress Orientation and Stressing Rate Karen Luttrell, Jeanne Hardebeck, Elizabeth Hearn One of the key priorities for the Statewide California Earthquake Center is improving observations and closing critical data gaps for the suite of Community Earth Models (CEM). The Community Stress Model (CSM) was developed throughout SCEC4 and... more Themes: Improving Observations and Closing Data Gaps	24100
Group A Poster 187	GM	Further Validation of a Dynamic Heterogeneous Stress Drop Model to Predict Near-Field Ground Motion for Strike-Slip Earthquakes Shuo Ma The heterogeneous stress drop model that is self-similar, with short-wavelength components tied with rupture length, provides a remarkable fit to the near-field ground motion from Mw 7 earthquakes (Andrews and Ma, 2016). However, for events smaller... more Themes: Advanced Modeling Frameworks \| Research Computing	23121
Group A Poster 087	Geodesy	Heat flow controls on the Mw7.1 July 6, 2019 Ridgecrest Earthquake postseismic deformation from Sentinel-1 Burst Overlap Interferometry Yohai Magen, Gidon Baer, Alon Ziv, Asaf Inbal, Ran Nof The July 2019 Ridgecrest earthquake sequence struck the Eastern California Shear Zone, consisting of an Mw6.4 foreshock and an Mw7.1 mainshock, and ruptured a complex network of orthogonal faults. In this study, we measure the co- and post-seismic... more Themes: Improving Observations and Closing Data Gaps
Group B Poster 068	SDOT	How Fast, How Deep, and How Much? - Seismic Sensing of Groundwater Recharge from the Atmospheric-River Storms of 2023 Shujuan Mao, William Ellsworth, Yujie Zheng, Gregory Beroza In early 2023, a series of intense atmospheric river storms eased California’s historic drought, yet the extent of groundwater replenishment remains poorly understood. We track groundwater in Greater Los Angeles from 2003 through the 2023 Storms... more Themes: Improving Observations and Closing Data Gaps \| Improving Predictive Analyses of Seismicity \| Applied Science Implementation
Group A Poster 129	FARM	Investigating the effects of velocity contrasts on rupture propagation along branching faults: Implications for the junction between the Mission Creek, Banning and the Southern San Andreas fault Evan Marschall, Nobuki Kame, Roby Douilly Complex crustal faults can sometimes separate material with different elastic properties. Dissimilar media around faults, also referred to as bimaterial interface, has been shown to cause effects on the rupture process along vertical strike-slip... more	24125
Talk Mon0800	FARM	The Mendocino Triple Junction: Faulting Complexity Onshore and Offshore Kathryn Materna The Mendocino Triple Junction (MTJ), at the intersection of the San Andreas Fault, the Mendocino Fault, and the Cascadia Subduction Zone, is a complex three-dimensional zone of faulting that represents California’s most seismically active region. I... more Themes: Improving Observations and Closing Data Gaps
Group B Poster 010	Seismology	Aftershock interferometry illuminates the fault zone beneath the Noto peninsula Eric Matzel Using interferometry, aftershocks of large earthquakes can be treated as a network of virtual seismometers to allow detailed imagery along the fault trace. The Virtual Seismometer Method (VSM) is a technique that provides precise estimates of the... more Themes: Improving Observations and Closing Data Gaps \| Advanced Modeling Frameworks \| Research Computing
Group A Poster 069	Seismology	Deep Learning Enhanced Earthquake Catalog for Northern California Ian McBrearty, Weiqiang Zhu, Bo Rong, Gregory Beroza Developing enhanced earthquake catalogs is essential for nearly all aspects of seismology, including understanding foreshock and aftershock behavior, imaging the Earth structure, and identifying active faults. Here we present progress on a deep... more Themes: Improving Observations and Closing Data Gaps \| Research Computing	24133
Group A Poster 101	Geology	Confirmation of a rapid Late Holocene slip rate for the central Garlock fault, southern California Sally McGill, James Burns, Kyle Peña, Ed Rhodes, James Dolan Prior work at the Christmas Canyon West (CCW) site on the central Garlock fault, in Searles Valley, measured a ~26 m left-lateral offset of ~1.9 ka alluvial deposits to establish a Late Holocene, left-lateral slip rate of ~14 mm/yr that is almost... more Themes: Improving Observations and Closing Data Gaps	16260
Group A Poster 093	Geology	Implications for fault segmentation and rupture connectivity from high spatial-resolution geomorphic data, rupture forecasting, and Boundary Element Method modeling Devin McPhillips, Andre Mere, Scott Marshall Paleoseismologists aspire to reconstruct prehistoric earthquake ruptures with length and displacement resolved at the sub-kilometer scale, approaching the resolution of modern rupture data, but the geologic record rarely supports such detail. Here,... more Themes: Improving Observations and Closing Data Gaps
Group A Poster 127	FARM	Investigating potential earthquake triggering and delay effects along the southern San Andreas fault by Lake Cahuilla level change Qingjun Meng, Zhen Liu, Yingdi Luo A series of large quasi-periodic earthquakes (five to seven) occurred along Southern San Andreas Fault (SSAF) during the last millennium, at an interval between ~116 and ~221 years (Philibosian et al., 2011). However, the cause for a much longer... more Themes: Advanced Modeling Frameworks \| Improving Predictive Analyses of Seismicity	24079
Group A Poster 179	GM	Developing a Near-fault Non-ergodic Ground Motion Model for the Ridgecrest, CA, Area Xiaofeng Meng, Camilo Ignacio Pinilla Ramos, Albert Kottke, Yehuda Ben-Zion One major obstacle in earthquake research is the lack of near-fault recordings (<10 km). Abundant near-fault recordings could transform our understanding of the physics of earthquakes and generation of ground motion at very short distances. In... more Themes: Improving Observations and Closing Data Gaps \| Advanced Modeling Frameworks \| Applied Science Implementation
Group B Poster 204	EFP	OpenSHA fault system tools for building, reproducing, and computing and disaggregating hazard from fault-system-solution earthquake rupture forecasts Kevin Milner OpenSHA Fault System Tools (FST; https://github.com/opensha/opensha-fault-sys-tools) is a suite of command line utilities related to fault-system-solution earthquake rupture forecasts, such as those developed for the western United States as part of... more Themes: Advanced Modeling Frameworks \| Applied Science Implementation \| Research Computing
Group B Poster 008	Seismology	An analysis of the pre-, co-, and post-seismic effects of the 2024 Noto Earthquake and Tsunami Saeed Mohanna, Lingsen Meng, Alessandro Vuan, Tung-Cheng Ho, Chao An, Liuwei Xu With 299 fatalities, the 2024 New Year’s Day earthquake and subsequent tsunami that struck the Noto Peninsula was the deadliest since the 2011 Tohoku earthquake and tsunami. To understand the physical driver of this earthquake, we analyzed the... more Themes: Advanced Modeling Frameworks \| Research Computing
Group A Poster 163	FARM	Determinism and stochasticity in laboratory earthquakes final size driven by interface heterogeneity Doron Morad, Shahar Gvirtzman, Jay Fineberg, Emily Brodsky The study of seismic waves is the most commonly used tool to determine the rupture dynamics of an earthquake. Earthquake source parameter estimates use difficult-to-assess assumptions about the source time function and path which are necessary in... more Themes: Improving Predictive Analyses of Seismicity	24172
Group A Poster 027	Seismology	Probing Seismicity Secrets with Five Nodal Arrays around the San Jacinto Fault Taiga Morioka, Florent Brenguier, Elizabeth Cochran, Wenyuan Fan, Quentin Higueret, Daniel Hollis, Peter Shearer, Frank Vernon, John Vidale, Ruoyan Wang, Hao Zhang The spatiotemporal relationship between the frequent small earthquakes and the much rarer occurrence of large earthquakes is not yet clear; clarifying that connection is fundamental to better understanding fault mechanics and earthquake nucleation.... more Themes: Improving Observations and Closing Data Gaps
Group B Poster 098	Geology	A Newly Recognized Dextral Fault System in Metropolitan San Diego Karl Mueller, Wolfgang Lopez We have identified an active, 140 km long, right lateral fault system that extends through Metropolitan San Diego, from North County to Ensenada. Identification and mapping of fault scarps with a suite of DEM’s and historical maps and 3D mapping of... more Themes: Improving Observations and Closing Data Gaps
Group A Poster 067	Seismology	Seismicity and monitoring of Canada's volcanic zones Taimi Mulder, John Cassidy Canada’s volcanic zones are located along the tectonic plate boundary region of western Canada, extending for more than 2000 km from southern British Columbia to the Yukon/Alaska border. Within these zones the two most recently active volcanoes are... more
Group B Poster 056	Seismology	WaveCastNet: An AI-enabled Wavefield Forecasting Framework for Earthquake Early Warning Rie Nakata Large earthquakes can be destructive and quickly wreak havoc on a landscape. To mitigate immediate threats, early warning systems have been developed to alert residents, emergency responders, and critical infrastructure operators seconds to a minute... more Themes: Advanced Modeling Frameworks \| Research Computing	24105
Talk Mon0800	FARM	Unsolved Mysteries of California’s Creeping Faults Johanna Nevitt SCEC’s expansion to the full transform plate boundary brings into its purview many additional faults that slip aseismically (“creep”) during the interseismic period. In most cases, we understand these faults to be partially creeping and partially... more Themes: Improving Observations and Closing Data Gaps \| Developing Rheologies and Bridging Multi-Scales
Group A Poster 231	CEM	Problems and Inconsistencies with Major Preferred Faults in the Community Fault Model (CFM6.1) Craig Nicholson From 2009-2021, the CFM strived to produce a comprehensive 3D fault set that is internally consistent and kinematically compatible, as well as predictive and well validated against data and observations [Nicholson et al., 2009-2021]. Such efforts to... more Themes: Improving Observations and Closing Data Gaps \| Improving Predictive Analyses of Seismicity	21023
Group B Poster 170	GM	Path Effects and Crustal Properties in the San Francisco Bay Area Tara Nye, Grace Parker, Annemarie Baltay, Evan Hirakawa, Kyle Withers, Morgan Moschetti We investigate relationships between earthquake ground motion path effects and crustal properties for the San Francisco Bay Area (SFBA) using residual analysis of ground-motion models (GMMs). GMMs are a key component in probabilistic seismic hazard... more Themes: Advanced Modeling Frameworks \| Improving Predictive Analyses of Seismicity \| Applied Science Implementation
Group B Poster 162	FARM	Dislocation density as a control on the frictional strength of fault gouge Kristina Okamoto, Amy Ryan, Heather Savage, Lars Hansen, Amanda Dillman The frictional behavior of fault gouge is frequently modeled with the empirical rate-state frictional law. However, the frictional parameters that are determined by this method are only valid at the exact conditions at which experiments were... more Themes: Developing Rheologies and Bridging Multi-Scales
Group B Poster 172	GM	Topography and Low-velocity Taper Improve Accuracy of 0-1 Hz Wave Propagation Simulations in the San Francisco Community Velocity Model (SFCVM) Kim Olsen, Te-Yang Yeh We have simulated 0-1 Hz wave propagation for 3 M4 events in a 40 km by 40 km section of the northern Bay Area Community Velocity model (SFCVM, Hirakawa and Aagaard, 2022), just east of San Francisco, to quantify the effects of topography, a low-... more Themes: Developing Rheologies and Bridging Multi-Scales \| Advanced Modeling Frameworks \| Research Computing
Group B Poster 022	Seismology	Expanding the Seismicity Catalog in San Fernando Valley with Dense Array Recordings of Micro-Earthquakes Joses Omojola, Patricia Persaud The San Fernando Valley (SFV) is a major population center close to downtown Los Angeles. Following the 1971 (Mw 6.7) San Fernando event, significant changes in construction practices and regulations were implemented to make the SFV area more... more Themes: Improving Observations and Closing Data Gaps \| Applied Science Implementation	24148
Group B Poster 032	Seismology	A Preliminary Framework for Evaluating the Effectiveness of 1D Ground Response Analysis at Vertical Array Sites Utilizing the Spatial Variability of mHVSR Francisco Javier Ornelas, Christopher de la Torre, Jonathan Stewart One-dimensional (1D) ground response analysis (GRA) is commonly used to evaluate site response but has limitations for situations in which the wave propagation phenomena at the site are not dominated by vertically propagating waves through nearly... more Themes: Improving Observations and Closing Data Gaps \| Advanced Modeling Frameworks \| Improving Predictive Analyses of Seismicity
Group B Poster 132	FARM	Breaking the elastic mold: The effect of upper plate permanent deformation on earthquake cycles Bar Oryan, Alice-Agnes Gabriel, Dave A. May One of the most commonly held assumptions in earthquake hazard assessment is that the off-fault deformation associated with the earthquake cycle is purely elastic. In subduction settings, this suggests that all off-fault strain associated with the... more Themes: Developing Rheologies and Bridging Multi-Scales \| Advanced Modeling Frameworks \| Applied Science Implementation	24127, 24103
Group B Poster 208	EFP	Earthquake-Cycle Modality Revealed by Paleoseismic Inter-Event Time Distributions Michael Oskin, Wing Yee Winnie Lau, Katherine Scharer, Evelyn Usher Seismic source hazard-models endeavor to predict earthquake likelihood from elapsed time since a prior event. Here we show that recurrence intervals from long paleoseismic records (n>10 events) from plate-boundary strike-slip faults in California... more Themes: Improving Predictive Analyses of Seismicity	24120, 22092
Group A Poster 143	FARM	Fault-valve instability: a mechanism for slow slip events So Ozawa, Yuyun Yang, Eric Dunham Geophysical and geological studies provide evidence for cyclic changes in fault-zone pore fluid pressure that synchronize with or at least modulate slip events. A hypothesized explanation is fault valving arising from temporal changes in fault zone... more Themes: Advanced Modeling Frameworks
Group B Poster 198	EFP	Testing Rate-and-State Predictions of Aftershock Decay with Distance Morgan Page, Nicholas van der Elst, Sebastian Hainzl We analyze aftershocks of the 2019 M7.1 Ridgecrest mainshock and isolated M5-6 mainshocks in Southern California to test predictions made by the rate-and-state friction model of Dieterich (1994). Rate-and-state friction predicts that the seismicity... more Themes: Improving Predictive Analyses of Seismicity
Group A Poster 013	Seismology	Understanding the uncertainties in phase pick labels using neural networks as analyst analogs Yongsoo Park, Ting Chen, Brent Delbridge Human labeled seismic phase arrival times have been directly used for training phase-picking neural networks. However, human errors and biases are naturally baked into these labels due to the subjectivity of the labeling task, and neural networks... more Themes: Improving Observations and Closing Data Gaps
Group A Poster 173	GM	A New Near-Source Saturation Model for EAS based on the NGA-West3 Database Grace Parker, Annemarie Baltay, Gail Atkinson, David Boore, Tristan Buckreis, Jonathan Stewart We develop a model for the near-source saturation of ground motions for shallow crustal earthquakes using the NGA-West3 database of effective amplitude spectra (EAS, the smoothed quadratic mean of two horizontal-component Fourier amplitude spectra... more
Group B Poster 188	GM	The Organizational Process of the Database of Fragile Geologic Features in S.California and Nevada Destini Paton, Xiaofeng Meng This study focuses on Fragile Geologic Features (FGFs), specifically Precariously Balanced Rocks (PBRs), which serve as natural indicators of the maximum ground motions experienced at a given location. It helps determine what areas would be best to... more Themes: Improving Observations and Closing Data Gaps \| Advanced Modeling Frameworks \| Improving Predictive Analyses of Seismicity	24091

The Statewide 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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