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 201-244 of 244

SCEC ID	Category	Title and Authors	SCEC Award
Group A Poster 209	EFP	Fault dynamics parameter identification using Physics-Informed Neural Networks Napat Tainpakdipat, Ahmed Elbanna Characterization of seismic events requires fusion of data and models related to the earthquake fault dynamics and seismic wave propagation. While this task is crucial for risk assessment and forecasting, it remains challenging due to the complex... more Themes: Improving Observations and Closing Data Gaps \| Advanced Modeling Frameworks \| Improving Predictive Analyses of Seismicity
Group A Poster 151	FARM	Comparing Quasi-Dynamic and Fully Dynamic Earthquake Cycle Simulations on Dip-Slip Faults Zizhuang Tang, Benchun Duan Quasi-dynamic (QD) earthquake cycle simulations typically use radiation damping (Rice, 1993) to approximate the coseismic rupture process and ignore seismic wave propagation. They are computationally efficient. However, previous studies on strike-... more Themes: Advanced Modeling Frameworks \| Research Computing
Group A Poster 019	Seismology	Assembling, integrating, and assessing 3D seismic velocity models for California Clifford Thurber With the geographic expansion of the Statewide California Earthquake Center (SCEC), there are several existing 3D statewide and northern California seismic velocity models that can be incorporated into the existing Unified Community Velocity Model (... more	24093
Group B Poster 096	Geology	Developing a machine learning dataset to facilitate fine-detail post-earthquake fault rupture mapping Leigh Tucker, Zhiang Chen, Devin McPhillips, Katherine Scharer, Mark Hu, Alba Rodriguez Padilla, Zachary Ross Many earthquake science goals, including understanding dynamic rupture processes and developing probabilistic fault displacement hazards, require data from earthquake fault rupture maps. These maps are typically generated by scientists mapping the... more Themes: Improving Observations and Closing Data Gaps \| Research Computing
Group A Poster 229	CEM	On-demand user-defined mesh builder, CFM Remesher for SCEC Community Fault Models Sui Tung, Kaitlyn Williams, Timothy Masterlark, Seok-Jun Kang A diversity of earthquake research relies on incorporating existing, but relatively sophisticated, renderings of 3D fault geometry into the corresponding analytical models and numerical simulations. For instance, geodetic creep rates of faults are... more Themes: Advanced Modeling Frameworks \| Research Computing	24192
Group B Poster 090	Geology	Active faulting at Lassen NP and surrounding areas Evelyn Usher, Michael Oskin Recent lidar surveys reveal numerous previously unrecognized active faults within Lassen Volcanic National Park and its surrounding area. The area connects predominantly strike-slip faulting in the northern Walker Lane with extension of the Hat... more Themes: Improving Observations and Closing Data Gaps
Group A Poster 211	EFP	Using ETAS+ to forecast aftershock sequences Nicholas van der Elst Earthquake catalogs provide the core data of statistical seismology but are typically incomplete records of the earthquakes that occur. Incomplete detection results from sparse network coverage and saturation of the network during periods of high... more Themes: Improving Predictive Analyses of Seismicity
Group A Poster 049	Seismology	Ridgecrest aftershock stress drops from P- and S-wave spectral decomposition Ian Vandevert, Peter Shearer, Wenyuan Fan Seismic moment and stress drop are crucial for understanding earthquake rupture processes, but their estimates often have large uncertainties for small earthquakes. Stress drop is typically inferred from an earthquake’s source spectrum based on... more Themes: Improving Observations and Closing Data Gaps
Group B Poster 078	Geodesy	Southern California 3-D Velocity and Strain Rate Field from Joint Inversion of GNSS and InSAR Data Mradula Vashishtha, Jeonghyeop Kim, William Holt Southern California exhibits complex deformation patterns and fault systems. We combine the strengths of GNSS and InSAR using the joint inversion to overcome their spatial and directional limitations respectively. We employ a physics-based... more Themes: Applied Science Implementation	24177
Group B Poster 062	SDOT	Characteristic Slow‐Slip Events on the Superstition Hills Fault Ellis Vavra, Yuri Fialko, Thomas Rockwell, Roger Bilham, Petra Stepancikova, Jakub Stemberk, Petr Taborik, Josef Stemberk Multiple decades of observations have documented a wide range of slip behavior along the Superstition Hills Fault (SHF) at the southern end of the San Jacinto Fault Zone in Southern California. The SHF experienced a notable M 6.6 earthquake in 1987... more Themes: Improving Observations and Closing Data Gaps
Group A Poster 005	Seismology	Accelerating Full-Waveform Inversion with Fourier Neural Operators Luis Vazquez, Qingkai Kong, Eric Matzel, Caifeng Zou, Youngsoo Choi, Zachary Ross, Kamyar Azizzadenesheli, Robert Clayton Full-Waveform Inversion (FWI) is a powerful tool to determine earth structure models, but it is a computationally expensive approach. To alleviate this, numerous techniques have been proposed to perform FWI more rapidly by leveraging different... more Themes: Advanced Modeling Frameworks \| Applied Science Implementation \| Research Computing
Group A Poster 157	FARM	Modeling rupture propagation into creeping faults by thermal pressurisation Victor Vescu, Oliver Stephenson, Nadia Lapusta Different sections of faults, like the San Andreas (SAF), accommodate stress via stick-slip under velocity-weakening friction or through gradual creep in a velocity-strengthening regime. When a rupture reaches a region of slow slip, thermal... more Themes: Advanced Modeling Frameworks	24204
Group A Poster 029	Seismology	The Los Angeles Basin Shape and its Underlying Shallow Moho Valeria Villa, Robert Clayton, Fan-Chi Lin, Heather Ford The sedimentary basin underneath the megalopolis of Los Angeles intensifies seismic motions and prolongs the shaking duration. Characterizing the basin’s shape, which in this case, is quite distorted due to its complicated formation, is necessary to... more Themes: Improving Observations and Closing Data Gaps
Group A Poster 103	Geology	Trona – Ridgecrest Earthquake Sequence - Definitive Mapping and Investigation Through the Use of InSAR Miles Wagner The Wagner Index (WI) is a method for locating and mapping potential faults using InSAR data. It was determined that a method to indicate the quality of an InSAR-located fault, fault direction, and any associated main earthquake event is needed for... more Themes: Improving Observations and Closing Data Gaps
Group B Poster 116	FARM	Simulating earthquake cycles using lab-derived, physics-based friction with multiple deformation and healing mechanisms Binhao Wang, Mingqi Liu, Sylvain Barbot Earthquake cycles are governed by the dynamic evolution of friction on geological faults. Laboratory experiments have revealed a three-regime frictional behavior across a variety of rock types, including granite, basalt, and natural fault gouges.... more Themes: Developing Rheologies and Bridging Multi-Scales \| Advanced Modeling Frameworks
Group B Poster 018	Seismology	Non-symmetric seismic moment tensors and seismic torques: Theory and application to caldera collapse earthquakes at Kīlauea Volcano in 2018 Taiyi Wang, Eric Dunham Unsteady subsurface magma movement radiates seismic waves that encode source dynamics. Kinematic source inversions are widely used to determine equivalent seismic force and moment tensors that represent source dynamics, but the relationship between... more Themes: Advanced Modeling Frameworks \| Research Computing
Group A Poster 109	Geology	Evidence for Active Faults as Hydraulic Barriers to Cross-Fault Flow: A case study of the Earthquake Valley Fault in Warner Basin, southern California Matthew Weingarten, Jennasea Fisher Fluid flow along active faults can play a crucial role in fault behavior as fault permeability exhibits a strong control on stress accommodation at depth. Broadly speaking, the spatial distribution of fault hydraulic properties within the southern... more Themes: Improving Observations and Closing Data Gaps \| Advanced Modeling Frameworks
Group B Poster 092	Geology	A New 3D Fault Model of the Southern San Joaquin Fold and Thrust Belt, California, and its implications for Regional Earthquake Hazards Robert Welch, John Shaw, Chris Anthonissen, James Dolan, Benjamin Kargère The 1982 (M 5.5) New Idria, 1983 (M 6.5) Coalinga, and 1985 (M 6.1) Kettleman Hills earthquakes demonstrated the activity of blind fault thrust ramps in the San Joaquin Fold and Thrust Belt. Yet, the activity and seismogenic potential of other... more
Talk Mon0800	Geology	The Walker Lane and Eastern California Shear Zones Steven Wesnousky Studies outside the most populated regions of California may aid in development of seismic hazard assessments across the State. The Walker Lane (WL) that extends northward from Eastern California Shear Zone (ECSZ) in the Mojave and northward along... more Themes: Improving Observations and Closing Data Gaps
Group A Poster 145	FARM	Breaking down Byerlee: The effect of normal stress on the frictional strength of monomineralic fault gouge Otis Wickenhaeuser, Kristina Okamoto, Heather Savage, Annia Fayon Deformation in fault gouges can occur by several processes - including gouge layer dilation, grain crushing, and plastic deformation at asperity contacts - that ultimately give rise to the shear strength (coefficient of friction) and the frictional... more Themes: Developing Rheologies and Bridging Multi-Scales
Group B Poster 030	Seismology	The evolution of fault orientation in the 2019 Ridgecrest earthquake sequence with a new long-term catalog of seismicity and moment tensors John Wilding, James Atterholt, Zachary Ross Throughout an earthquake sequence, perturbations to the stress field may lead to changes in the distribution of active fault orientations. Resolving such changes for narrow spatiotemporal windows requires high-quality seismicity catalogs and... more Themes: Improving Observations and Closing Data Gaps
Group A Poster 185	GM	Generation of Broadband Ground Motion from Dynamic Rupture Simulations: A Group Modeling Approach towards better Characterizing Seismic Hazard for Engineering Applications Kyle Withers, Yongfei Wang, Thomas Ulrich, Alice-Agnes Gabriel, Benchun Duan, Dunyu Liu, Jean-Paul Ampuero, Elif Oral, Luis Dalguer, Frantisek Gallovic, Lubica Valentova, Domniki Asimaki We employ three-dimensional dynamic rupture simulations to generate a database of synthetic, broadband ground motions over a range of earthquake magnitudes, involving a large group of modelers using different numerical approaches and computational... more Themes: Advanced Modeling Frameworks \| Research Computing	23121
Group A Poster 015	Seismology	Nearfield Strong-motion of the 2023 M7.8 Kahramanmaraş Earthquake and Implications for High-frequency Radiation Mechanisms Baoning Wu, Bo Li, Hao Zhang, Shuye Huang, Guoliang Li Classic earthquake models adequately explain the seismic wavefield below the earthquake corner frequency. However, at higher frequencies, seismic radiation becomes markedly more complex and stochastic, losing phase coherence across stations and... more Themes: Advanced Modeling Frameworks
Group B Poster 186	GM	Development of a Nonlinear Soil Model in SW4 (Seismic Waves, 4th Order) Flora Xia, Arben Pitarka High performance computing is advancing seismic risk mitigation by enabling simulations of seismic wave propagation to be run on a regional scale. SW4 (Seismic Waves, 4th Order) is one such seismic wave propagation code, which has demonstrated the... more Themes: Advanced Modeling Frameworks \| Applied Science Implementation \| Research Computing
Group A Poster 191	GM	3D Broadband (0-25 Hz) Ground Motion Simulations for Statewide California Ke Xu, Kim Olsen The SCEC Broadband Platform (BBP) is an essential tool for structural and geotechnical earthquake engineering applications, as well as for probabilistic seismic hazard analysis, with the capability to simulate ground motions up to 25 Hz. The BBP... more Themes: Advanced Modeling Frameworks \| Improving Predictive Analyses of Seismicity	24156
Group A Poster 009	Seismology	Dual-Initiation Ruptures in the 2024 Noto Earthquake Encircling a Fault Asperity at a Swarm Edge Liuwei Xu, Chen Ji, Lingsen Meng, Jean-Paul Ampuero, Zhang Yunjun, Saeed Mohanna, Yosuke Aoki To reveal the connections between the 2024 Mw7.5 Noto earthquake and the seismicity swarms that preceded it, we investigate its rupture process through near-source waveform analysis and source imaging techniques, combining seismic and geodetic... more Themes: Improving Observations and Closing Data Gaps
Group A Poster 203	EFP	Preliminary research on a probability-based medium term earthquake prediction in the Chinese mainland Rui Yan, huaizhong Yu, Shiguang Deng, Jie Liu, Mengyu Xie, Yawei Ma, Zhengyi Yuan Earthquake prediction is a controversial topic and is also one of the most challenging problems in the world. As a specialized organization that aimed for earthquake prediction, China Earthquake Administration (CEA) has been founded for a half... more Themes: Improving Observations and Closing Data Gaps \| Developing Rheologies and Bridging Multi-Scales \| Advanced Modeling Frameworks
Group B Poster 176	GM	Waveguide or not? Revised ground motion simulations for greater Los Angeles from the M7.8 ShakeOut earthquake scenario Te-Yang Yeh, Kim Olsen The ShakeOut scenario of a M7.8 northwestward rupture on the southern San Andreas fault (SSAF) (Jones et al., 2008) predicted significant long-period ground motion amplification in the greater Los Angeles, CA, area, caused by a waveguide from... more	24155
Group B Poster 178	GM	Comparisons of VS30 values from single station earthquake-based horizontal-to-vertical-spectral-ratios against non-invasive surface array-based site characterization methods Alan Yong, Tara Nye, Fumiaki Nagashima, Hiroshi Kawase, Koichi Hayashi, Kenneth Hudson, Antony Martin We explore the feasibility of using data directly recorded by earthquake network monitoring stations and the inversion technique of Nagashima et al. (2014) on earthquake-based horizontal-to-vertical spectral ratios (eHVSR) to model the shear wave... more Themes: Improving Observations and Closing Data Gaps \| Advanced Modeling Frameworks \| Applied Science Implementation
Group A Poster 053	Seismology	Precise aftershock locations and focal mechanisms for the 2023-05-11 Mw 5.5 Lake Almanor, Northern California, earthquake from a two-month nodal seismometer deployment Clara Yoon, Robert Skoumal, Jeanne Hardebeck, Rufus Catchings, Mark Goldman, Joanne Chan, Robert Sickler The 2023-05-11 Mw 5.5 Lake Almanor earthquake, and a Mw 5.2 aftershock ~11 hours later, ruptured normal faults in a sparsely instrumented region in Northern California, with only one strong-motion seismic station within 10 km and two broadband... more Themes: Improving Observations and Closing Data Gaps
Group A Poster 021	Seismology	Accuracy and Precision of Earthquake Location Programs: Insights from a Synthetic Controlled Experiment based on 2019 Ridgecrest Earthquake Sequence Yifan Yu, William Ellsworth, Gregory Beroza Earthquake location programs use a variety of algorithms to overcome the challenges posed by incomplete knowledge of complex Earth structures, making them essential for accurate hypocenter determination. However, evaluating their reliability in... more Themes: Improving Observations and Closing Data Gaps	24200
Group B Poster 148	FARM	Controls of Dynamic and Static Stress Changes and Aseismic Slip on Delayed Earthquake Triggering in Rate-and-State Simulations of the 2019 Ridgecrest Earthquake Sequence Jeena Yun, Alice-Agnes Gabriel, Dave May, Yuri Fialko Earthquake dynamic triggering frequently exhibits a time delay relative to the peak stress perturbation. For example, the 2019 Mw 7.1 Ridgecrest, CA, mainshock occurred 16.2 hours after a nearby Mw 5.4 foreshock, which induced dynamic stress changes... more Themes: Advanced Modeling Frameworks \| Improving Predictive Analyses of Seismicity \| Research Computing	24103, 24127
Group B Poster 044	Seismology	Determination of shallow crustal structure in Northern California and community model validation using ambient-noise-derived Rayleigh wave ellipticity and receiver functions: Preliminary results Gabriela Zaldivar Andrade, HyeJeong Kim, Fan-Chi Lin, Taka'aki Taira Northern California has several active faults prone to large-magnitude earthquakes, such as the Hayward Fault in the San Francisco Bay Area. A three-dimensional (3D) seismic velocity model is a key component in evaluating ground motion predictions... more Themes: Improving Observations and Closing Data Gaps \| Research Computing	24098
Group B Poster 230	CEM	Update of the Lower Seismogenic Depth Model for Western U.S. Earthquakes Yuehua Zeng, Mark Petersen, Oliver Boyd We present an updated model of the lower seismogenic depth of earthquakes in the western United States (WUS), estimated using the hypocentral depths of events with magnitudes greater than 1, a crustal temperature model, and historical earthquake... more Themes: Developing Rheologies and Bridging Multi-Scales \| Advanced Modeling Frameworks
Group B Poster 002	Seismology	High-frequency energy radiation controlled by the rupture complexity Hao Zhang, John Vidale Since its introduction to seismology in the 1960s, the seismic moment (M_0) has become the most crucial and reliable earthquake source parameter. While the seismic moment determined using long-period waves is less affected by a source’s structural... more Themes: Developing Rheologies and Bridging Multi-Scales \| Advanced Modeling Frameworks
Group B Poster 012	Seismology	Mapping of absolute deviatoric stresses around two California earthquakes reveals a very weak crust Siyuan Zhang, Heidi Houston, Binhao Wang, Hao Zhang Absolute amplitudes of shear stresses that drive crustal earthquakes are not well known. There is a long-standing divergence between the values inferred from lab experiments and stress changes during faulting. Two large earthquakes near Ridgecrest,... more Themes: Improving Observations and Closing Data Gaps \| Developing Rheologies and Bridging Multi-Scales
Group B Poster 146	FARM	Effects of fault geometry and pore fluid on the dynamic rupture process of the 2008 Mw 7.9 Wenchuan earthquake, China, on a multi-fault system Wenqiang Zhang, Yajing Liu The 2008 Wenchuan Mw7.9 earthquake, China, occurred in the Longmenshan thrust belt on the eastern margin of the Tibetan Plateau. Coseismic surface rupture extended ~ 240 km along the Beichuan-Yingxiu fault (BYF) and ~ 70 km along the Pengguan fault... more Themes: Advanced Modeling Frameworks \| Research Computing
Group A Poster 207	EFP	Spatio-Temporal Earthquake Forecasting with Informed Point-process Optimization (STEF-IPO) Yizhou Zhang, Zijun Cui, Leila Mizrahi, Yan Liu, Yehuda Ben-Zion Earthquake prediction is a fundamental unsolved problem with significant societal relevance. In recent years, promising research has been conducted on earthquake forecasting, particularly with the development of deep learning models based on... more Themes: Advanced Modeling Frameworks \| Improving Predictive Analyses of Seismicity \| Research Computing	24186
Group B Poster 134	FARM	Multiscale Dynamics of 3D Rupture Zones using a Continuum Damage Breakage Rheology Chunhui Zhao, Ahmed Elbanna, Yehuda Ben-Zion The interplay of earthquakes and off-fault damage is crucial for understanding seismic hazards and risks. A three-dimensional setup offers a framework for studying fundamental topics in the mechanics of earthquakes and faults, including the... more Themes: Developing Rheologies and Bridging Multi-Scales \| Advanced Modeling Frameworks
Group A Poster 007	Seismology	A Simulator of Earthquakes and aseismic slip on a Heterogeneous strike-slip Fault (HFQsim) with static/kinetic friction and temperature-dependent creep Xiaoyu Zhou, Yehuda Ben-Zion We develop an earthquake simulator to study the partitioning of seismic/aseismic slip and dynamics of Earthquakes on a Heterogeneous strike-slip Fault (HFQsim) using a generalized model of a discrete fault governed by static/dynamic friction and... more Themes: Advanced Modeling Frameworks \| Research Computing
Group B Poster 016	Seismology	Abundant Repeating Earthquakes with Non-repeatable Ruptures on the Erkenek-Pütürge Fault (SE Turkey) Yijian Zhou, Abhijit Ghosh Repeaters are known as earthquakes that rupture the same asperity repeatedly, generating highly-similar waveforms. However, repeaters can also experience various rupture processes, especially following large earthquakes, as evidenced by the temporal... more Themes: Improving Observations and Closing Data Gaps \| Improving Predictive Analyses of Seismicity
Group A Poster 217	EFP	Quantification of earthquake Predictability and detailing of entropy-based scores for evaluating earthquake forecast Jiancang Zhuang In earthquake forecasting, there is a significant gap between complete randomness and complete deterministicity. This presentation begins by discussing how to quantify predictability and outlining the current state of earthquake predictability from... more Themes: Improving Predictive Analyses of Seismicity
Group A Poster 051	Seismology	Deep Neural Helmholtz Operators for 3D Elastic Wave Propagation and Inversion Caifeng Zou, Kamyar Azizzadenesheli, Zachary Ross, Robert Clayton Numerical simulations of seismic wave propagation in heterogeneous 3D media are central to investigating subsurface structures and understanding earthquake processes, yet are computationally expensive for large problems. This is particularly... more Themes: Advanced Modeling Frameworks
Group B Poster 112	Geology	Quantifying the erasure of earthquake surface ruptures from desert landscapes: Implications for rupture hazard assessment Malinda Zuckerman, Alba Rodriguez Padilla, Ramon Arrowsmith, Madeline Schwarz, Zhiang Chen Seismic hazard analysis relies on knowledge of the segmentation of faults and the distribution of slip in past earthquakes. This information is recorded in the landscape coseismically as recognizable landforms. These landforms are erased over time... more Themes: Improving Observations and Closing Data Gaps \| Applied Science Implementation

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.

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

Meeting Abstracts

IMPORTANT DATES

ABOUT SCEC

QUICK LINKS

HEADQUARTERS AT