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 51-100 of 301

SCEC ID	Category	Title and Authors	SCEC Award
Group C Poster 234	GM	Investigating the Basin Effect on Ground Motions Using Laboratory Seismic Data Based on 3D-Printed Los Angeles Basin Structure Sifang Chen, Jiong Wang, Sunyoung Park Earthquake ground motion is greatly affected by small-scale features such as surface topography and basins, and quantifying the influence of these structures is crucial in seismic hazard analysis. In particular, understanding the basin effect is of... more Themes: Community Models \| Ground Motion Simulation \| Velocity and Rheology of Basin Sediments	22033
Group B Poster 272	EEII	Shakebot: a low-cost, open-source shake table for structural seismology research Zhiang Chen, Devin Keating, Yash Shethwala, Aravind Adhith Pandian Saravanakumaran, Jnaneshwar Das, Ramon Arrowsmith, Christopher Madugo, Albert Kottke Our previous study built a virtual shake robot to simulate dynamics of precariously balanced rocks (PBR); however, simulation results need to be validated through physical experiments. We have developed a low-cost, open-source shake table, also... more Themes: Ground Motion Simulation \| Induced Seismicity \| Public Education and Preparedness
Group B Poster 256	SAFS	Fine-scale complex fault structure and slip along the San Andreas Fault: Contrasting seismic behaviors in localized and diffuse fault zones Yifang Cheng, Roland Bürgmann, Richard Allen The central San Andreas Fault exhibits diverse modes of seismic and aseismic deformation along a highly localized fault zone. Although the main fault trace appears as a simple planar fault structure, small earthquakes reveal a highly complex fault... more Themes: Stress and Deformation Over Time \| Community Models \| Beyond Elasticity
Group B Poster 120	CS	Numerical modeling of ground surface deformation related to thrust and reverse fault earthquakes: A discrete element approach Kristen Chiama, Andreas Plesch, Robb Moss, John Shaw Ground surface ruptures during large earthquakes pose significant hazards to urban environments, critical information and energy transmission infrastructure, transportation systems, as well as other sensitive facilities. We seek to improve our... more Themes: Risk to Distributed Infrastructure	22013
Group A Poster 037	Seismology	How is fault complexity linked to high-frequency radiation from Southern California earthquakes? Shanna Chu, Annemarie Baltay, Victor Tsai, Rachel Abercrombie, Greg Hirth, Daniel Trugman Fault complexity has been linked to enhanced high frequency radiation in earthquakes, but the specific relationships between earthquake source complexity, the radiated spectrum and what kind of physical mechanisms are involved are still not well... more Themes: Modeling Earthquake Source Processes \| Ground Motion Simulation
Group B Poster 030	Seismology	Relative Afterslip Moment Does Not Universally Control Aftershock Productivity, But Do Special Case-studies Reveal More Nuance? Robert Churchill Aseismic afterslip is postseismic fault sliding that may significantly redistribute crustal stresses and drive aftershock sequence. However, evidence for the link between afterslip and aftershocks is mostly case-study based, including observations... more Themes: Stress and Deformation Over Time \| Probabilistic Seismic Hazard Analysis \| Operational Earthquake Forecasting
Group A Poster 021	Seismology	Earthquake Early Warning with Graph Learning Tim Clements, Elizabeth Cochran, Sarah Minson, Annemarie Baltay, Clara Yoon We introduce a graph learning-based algorithm for earthquake early warning (EEW). The goal of EEW is to characterize when and where strong ground motion is expected as soon as possible after an earthquake starts. EEW systems currently in use across... more Themes: Data-Intensive Computing \| Earthquake Early Warning
Group B Poster 002	Seismology	Real-time performance and new developments of the Propagation of Local Undamped Motion (PLUM) earthquake early warning algorithm for the West Coast, U.S.A. Elizabeth Cochran, Jessie Saunders, Annemarie Baltay, Julian Bunn, Tim Clements, Debi Kilb, Sarah Minson, Colin O'Rourke, Clara Yoon We present real-time performance and new developments of the Propagation of Local Undamped Motion (PLUM) earthquake early warning algorithm that is being tested prior to inclusion in the ShakeAlert system. The ShakeAlert System operates in... more Themes: Earthquake Early Warning
Talk Tue 1400	Seismology	Recent progress in illuminating fault structure and behavior using seismology Elizabeth Cochran Seismology provides unique tools to probe the structure and behavior of fault slip zones across a range of depths and throughout the earthquake cycle. New fault observations have been enabled by improved use of existing data and recent growth of... more
Group A Poster 231	GM	Porting AWP-ODC to next generation architectures: the Characteristic Scientific Application project Yifeng Cui, Scott Callaghan, Yiming Ren, Lars Koesterke, Wenyang Zhang, Mattew Norman, Daniel Roten, Philip Maechling, Christine Goulet AWP-ODC is a SCEC community software program designed, and widely used, to perform large-scale, highly-parallel, physics-based earthquake rupture and wave propagation simulations. AWP-ODC currently achieves excellent speedup and efficiency on multi-... more Themes: Data-Intensive Computing \| Ground Motion Simulation \| Probabilistic Seismic Hazard Analysis
Talk Tue 0800	CEO	Towards Inclusive Teaching Through Online Learning: An Example from ROSES (Remote Online Sessions for Emerging Seismologists) Fransiska Dannemann Dugick TBD
Talk Wed 0800	EFP	Flexible and Scalable Earthquake Forecasting Kelian Dascher-Cousineau, Oleksandr Shchur, Emily Brodsky, Stephan Gunnemann Seismology is witnessing explosive growth in the diversity and scale of earthquake catalogs owing to improved seismic networks and increasingly automated data augmentation techniques. A key assumption in this community effort is that more detailed... more Themes: Data-Intensive Computing \| Probabilistic Seismic Hazard Analysis \| Operational Earthquake Forecasting	22114
Group C Poster 088	Geology	2022 updates regarding slip rates along Patagonia's fastest slipping strike strip faults: the Magallanes Fault (MF) and Liquiñe-Ofqui fault zone (LOFZ) Gregory De Pascale, Sebastian Perroud, Francisca Sandoval, Manuel Hernandez, Mario Persico Major plate boundary strike slip fault systems in Chilean and Argentine Patagonia provide important insight to crustal tectonics. Prior to 2020, slip rates along the Liquiñe-Ofqui fault zone (LOFZ) and the Magallanes Fault System (MFS) in Chile and... more Themes: Stress and Deformation Over Time \| Special Fault Study Areas: Focus on Earthquake Gates \| Probabilistic Seismic Hazard Analysis
Group B Poster 038	Seismology	Ubiquitous Earthquake Dynamic Triggering in Southern California Nicolas DeSalvio, Wenyuan Fan Earthquakes can be dynamically triggered by the passing waves of events from disconnected faults. The frequent occurrence of dynamic triggering offers tangible hope in revealing earthquake nucleation processes. However, the physical mechanisms... more
Group A Poster 281	CEO	Integration of the California faults into virtual reality: preliminary results using the gaming engine Unity Saul Diaz, Christodoulos Kyriakopoulos Today we are living in the new age of information, and countless tools are being developed that change the way humans consume information. These tools are currently being utilized mainly by the private sector to create new forms of entertainment,... more Themes: Public Education and Preparedness \| Experiential Learning and Career Advancement
Group B Poster 058	Seismology	Moment Tensor Catalog for California Using 3D Green's Functions Claire Doody, Arthur Rodgers, Andrea Chiang, Michael Afanasiev, Christian Boehm, Lion Krischer, Nathan Simmons Accurate moment tensors are vital for our understanding of earthquake processes and stress regimes in tectonically active regions. Most moment tensor computations are done using one-dimensional velocity models to compute Green’s Functions, as 1D... more Themes: Community Models \| Data-Intensive Computing	22130
Group A Poster 049	Seismology	Using seismic data to directly invert for the dynamic stress evolution during earthquake rupture Benchun Duan, Qingjun Meng, Dunyu Liu, Yongen Cai The static stress drop value and dynamic stress evolution process during earthquake rupture provide essential information of fault frictional behavior that governs earthquake rupture dynamics. At present, most of earthquake stress drop and evolution... more Themes: Stress and Deformation Over Time \| Modeling Earthquake Source Processes
Group B Poster 170	FARM	Multiscale Modeling of Damage Mechanics in Fault Zones Ahmed Elbanna, Alice-Agnes Gabriel, Yehuda Ben-Zion Natural faults are surrounded by regions of damaged rocks. Damaged fault zones evolve both co-seismically and inter-seismically. It is thus important to include inelastic strain processes on- and off-fault in modeling of individual rupture dynamics... more Themes: Stress and Deformation Over Time \| Beyond Elasticity \| Beyond Far-Field Approximations	21112
Group A Poster 187	SDOT	Inverting for interseismic deep slip on closely spaced faults using surface velocities and stressing rate tensors Hanna Elston, Michele Cooke, Jack Loveless, Scott Marshall Debate persists about the partitioning of active strike-slip between the southern and northern pathways of the southern San Andreas fault (SSAF) through the San Gorgonio Pass. Inversions of interseismic surface velocities that are often used to... more Themes: Stress and Deformation Over Time	21020, 20055
Group A Poster 077	Geodesy	A dense block model of western continental United States deformation for the 2023 update to the National Seismic Hazard Model Eileen Evans Seismic hazard assessment, such as the United States Geological Survey (USGS) National Seismic Hazard Model (NSHM), relies on estimates of long-term fault slip rate based on geology and/or geodetic observations such as the Global Navigation... more Themes: Community Models \| Probabilistic Seismic Hazard Analysis
Group B Poster 132	FARM	Inner California Borderland High-Resolution Fault Mapping: Rose Canyon Fault Releasing Stepover in San Diego Bay Pull-apart Basin Andrea Fabbrizzi, Eui-jo Marquez, Drake Singleton, Jillian Maloney, Thomas Rockwell, Neal Driscoll, Scott Rugg The releasing stepover in San Diego Bay is characterized by a pull-apart basin geometry between the southern termination of the Rose Canyon fault around downtown San Diego and the Descanso fault offshore along the USA-Mexico coastline. Although the... more Themes: Stress and Deformation Over Time \| Special Fault Study Areas: Focus on Earthquake Gates \| Probabilistic Seismic Hazard Analysis
Group A Poster 045	Seismology	Finite-source attributes of M 4 to 5.5 Ridgecrest, California earthquakes Wenyuan Fan, Haoran Meng, Daniel Trugman, Jeff McGuire, Elizabeth Cochran Resolving earthquake rupture processes is essential for understanding earthquake physics and determining seismic hazards. However, it remains challenging to solve the finite-source attributes of moderate and small earthquakes directly; rupture... more Themes: Modeling Earthquake Source Processes	20115, 21055
Group A Poster 277	CEO	Expanding SCEC Engagement: New Social Media Approaches with the Public and New Connections with Member Institutions Cameron Fetter, Bryan Castillo, Mark Benthien Ensuring that the general public and our schools are informed of earthquake hazards is one of the utmost priorities of the Southern California Earthquake Center (SCEC) Communication Education, and Outreach program. The main goal of this project was... more Themes: Public Education and Preparedness
Group A Poster 095	Geology	Surface deformation associated with the Mw 5.1 Sparta, North Carolina earthquake and evidence of recurrent Quaternary surface ruptures in an intraplate setting Paula Figueiredo, DelWayne Bohnenstiehl, Arthur Merschat, Mark Carter, Karl Wegmann, Matthew Ricker, Lewis Owen The shallow Mw 5.1 Sparta, North Carolina 2020 earthquake was triggered on an unknown fault in an intraplate setting with low tectonic stress. Surprisingly, initial field surveys identified a surface rupture, expressed by reverse scarps and/or... more Themes: Stress and Deformation Over Time \| Probabilistic Seismic Hazard Analysis \| Post-Earthquake Rapid Response
Group A Poster 265	CXM	A summary of the Community Geodetic Model products, availability and future Michael Floyd On behalf of the Community Geodetic Model Working Group, we present a summary of the Community Geodetic Model achievements, products and availability during the SCEC 5 project. We show how the GNSS and InSAR products are generated and how they... more Themes: Community Models	21026, 21035, 21019, 21060, 21151
Talk	CEO	SCEC Sponsor Remarks: Federal Emergency Management Agency (FEMA) Jon Foster Agency representatives provide their perspectives on future directions relevant to the SCEC community.
Group B Poster 086	Geology	Refining the record of incremental slip rate and paleo-earthquake ages for the western and central segments of the Garlock fault Dannielle Fougere, James Dolan, Sally McGill, Andrew Ivester, Ed Rhodes An increasing inventory of paleoseismic data indicate that whereas some faults experience relatively regular earthquake recurrence, many other faults exhibit earthquake recurrence that is highly irregular in both time and space. Moreover,... more Themes: Stress and Deformation Over Time
Group B Poster 278	CEO	Re-enfranchising communities in the wake of COVID-19: Lessons learned during the pandemic for reaching underserved schools with earthquake science Armando Franco, Austin Elliott, Susan Garcia, Katherine Scharer, Jessica Murray, Adria McClain, Andrew Michael In “Impact of COVID-19 on Science Education” the Public Policy Institute of California reports 62% of school districts deprioritized science education during academic year 2021-2022 due to limited support and resources. Only 40% of school districts... more Themes: Public Education and Preparedness
Group B Poster 250	SAFS	Loma Prieta Again: Subsurface Geology and the San Andreas Fault, Santa Cruz Mountains, Central California Gary Fuis, Rufus Catchings, Daniel Scheirer, Klaus Bauer, Mark Goldman, Tait Earney, Guoqing Lin, Edward Zhang The 1989 Mw 6.9 Loma Prieta earthquake is the first major event to occur along the San Andreas fault (SAF) zone in central California since the 1906 M 7.9 San Francisco earthquake. Given the complexity of this event, uncertainty has persisted as to... more Themes: Modeling Earthquake Source Processes \| Velocity and Rheology of Basin Sediments
Talk Mon 1400	Geodesy	Northern Exposure: Why you should consider studying the faults of northern California Gareth Funning In its next incarnation, SCEC plans to expand its region of interest in all directions, to become a truly statewide earthquake center. Given SCEC’s past priorities and future goals, I believe the faults of the northern San Andreas system provide... more Themes: Stress and Deformation Over Time \| Community Models \| Data-Intensive Computing	21035, 20177
Group A Poster 169	FARM	Fault-size dependent fracture energy and multi-scale earthquake rupture cascades Alice-Agnes Gabriel, Dmitry Garagash, Kadek Palgunadi, Paul Martin Mai Faults and fractures that host dynamic slip are known to vary over more than six orders of magnitude in source dimensions. Connected multi-fault systems on large (e.g., the Ridgecrest fault system) and small (e.g., fracture networks and damage zones... more Themes: Modeling Earthquake Source Processes
Group A Poster 177	FARM	Off-Fault deformation along the Superstition Hills and Elsinore Faults: Is there a fingerprint of Mmax preserved in fault damage zones? Hannah Gaston, William Griffith, Thomas Rockwell This study is driven by previous research that compares the fracture energy (G) for both laboratory and natural earthquakes, where energy for earthquakes smaller than Mw6.6 is dissipated primarily by frictional heating. Earthquakes larger than Mw6.8... more Themes: Probabilistic Seismic Hazard Analysis	21043
Group A Poster 131	FARM	Islands of chaos in a sea of periodic earthquakes: Constraining the allowable friction parameter space for large-magnitude earthquakes using recurrence patterns from the Alpine fault Hokuri Creek paleoseismic record, New Zealand Judith Gauriau, Sylvain Barbot, James Dolan Earthquake recurrence patterns on some faults derive from paleoseismic records that challenge time- and slip-predictable models. Such records are often categorized as clustered, random, or quasi-periodic according to the coefficient of variation (... more Themes: Stress and Deformation Over Time \| Modeling Earthquake Source Processes
Group A Poster 047	Seismology	Very low frequency earthquakes (VLFEs) offshore Cascadia – a new window to megathrust slip and frictional behavior Abhijit Ghosh, Kuntal Chaudhuri Cascadia megathrust produces M9 earthquakes, the last one being more than 300 years ago. Little is known about the slip behavior of the megathrust and its variability as the seismogenic zone of the fault lies offshore with minimal recorded seismic... more
Group A Poster 139	FARM	Testing rheological models for creep events using their temporal evolution Daniel Gittins, Jessica Hawthorne Along the central creeping section of the San Andreas Fault, aseismic slip does not occur at a steady rate. Instead, bursts of slip known as creep events regularly punctuate a steady background slip rate and can accommodate upwards of 50% of the... more Themes: Stress and Deformation Over Time
Group A Poster 061	Seismology	Real-Time Seismogeodetic Earthquake Magnitude Estimates for Local Tsunami Warnings Dorian Golriz, Barry Hirshorn, Yehuda Bock, Stuart Weinstein, Jonathan Weiss Tsunami Warning Centers (TWCs) use a variety of tools to issue a tsunami warning based on the size and location of the earthquake. However, current methods that rely on seismic data alone suffer from magnitude saturation or not timely enough for... more Themes: Modeling Earthquake Source Processes \| Earthquake Early Warning \| Post-Earthquake Rapid Response
Group A Poster 041	Seismology	A Minimized Site Characterization Method to Estimate VS30 using VR40 Jose Gomez, Alan Yong, Koichi Hayashi, Antony Martin, Andrea Di Martino, Tara Nye, Lilah Guerra, Jamison Steidl We estimate VS30, the time-averaged shear wave velocity of the upper 30 m from the ground surface, using a novel minimal site characterization method (MSCM) based on correlations with VR40, the Rayleigh-wave phase velocity at the 40 m wavelength... more
Group A Poster 015	Seismology	Seismicity, fault architecture, and slip mode of the westernmost Gofar transform fault Jianhua Gong, Wenyuan Fan Oceanic transform faults accommodate plate motions through both seismic and aseismic slips. However, deformation partition and slip mode interaction at these faults remain elusive mainly limited by rare observations. We use one-year ocean bottom... more
Group C Poster 075	Geodesy	Plate tectonics in the Gulf of California: back to the beginning. Jose Javier Gonzalez-Garcia From the beginning of the geometric formulation of the theory of Plate Tectonics the Gulf of California was considered as a substantive source of data. Going back, I use the model Geodvel (Argus et.al, 2010) for the boundary between the North... more Themes: Stress and Deformation Over Time
Group A Poster 035	Seismology	New observations of earthquakes and tremor dynamically triggered in Mexico Hector Gonzalez-Huizar In this study, the results of an intense search for tremor and earthquakes triggered in Mexico by the seismic waves from distant earthquakes is presented. The search for triggered events focuses along the Middle American Trench, one of the most... more Themes: Stress and Deformation Over Time
Group A Poster 275	EEII	A Seismologically Consistent Model for Surface Rupture Length Capturing Unbounded and Width-Limited Events Christine Goulet, Grigorios Lavrentiadis, Yongfei Wang, Norman Abrahamson, Yousef Bozorgnia A surface-rupture-length (SRL) relationship as a function of magnitude (M), fault thickness, and fault dip angle is presented. The objective of this study is to model the change in scaling between unbounded and width-limited ruptures. This is... more Themes: Ground Motion Simulation \| Probabilistic Seismic Hazard Analysis \| Risk to Distributed Infrastructure
Group A Poster 109	Geology	Possible recent fault scarp near Montréal - candidate fault for the 1732 M5.8 Earthquake Aube Gourdeau, Veronica Prush, Christie Rowe Montréal falls within the Western Quebec Seismic Zone (WQSZ). The WQSZ is a region of elevated but poorly defined earthquake risk with several historic, damaging earthquakes. In 1732, a M5.8 earthquake caused significant damage in the Montréal area... more
Group A Poster 209	EFP	Current State of New Zealand’s Operational Earthquake Forecasting (OEF) Kenny Graham, Annemarie Christophersen, Matthew Gerstenberger, David Rhoades In New Zealand, GNS Science through the GeoNet programme is the official provider of earthquake forecast information to help communities understand how earthquake sequences might evolve and aid recovery and future resilience planning. Such... more Themes: Community Models \| Probabilistic Seismic Hazard Analysis \| Operational Earthquake Forecasting
Talk Tue 1400	Geology	Can we identify fingerprints of seismic rupture in fault damage zones? William Griffith, Caje Kindred Weigandt, Hannah Gaston, Thomas Rockwell Inelastic yielding in fault damage zones during rupture propagation has important implications for the earthquake energy budget, static and dynamic triggering, seismic radiation, and fault zone permeability. Fault damage zones develop through a... more Themes: Stress and Deformation Over Time \| Beyond Elasticity \| Velocity and Rheology of Basin Sediments	20027, 21043, 22116
Group A Poster 043	Seismology	A Case Study Exploring Azimuthal Dependence of Peak Ground Acceleration: Motivated by Observations from the 29 May 2013 Isla Vista M4.8 Earthquake Lilah Guerra, Alan Yong, Tara Nye, Andrea Di Martino, Jose Gomez, Jamison Steidl, Antony Martin, Koichi Hayashi, Alessandro Amorosi, Ali Shafiee During the M4.8 2013 Isla Vista Event, seismic stations CE.25932 and CI.USB recorded anomalous peak ground acceleration (PGA) values. We consider the role of path effects; specifically, the azimuthal dependence of PGA for this region to see if this... more Themes: Velocity and Rheology of Basin Sediments
Group B Poster 070	Geodesy	Investigating Active Crustal Deformation along the San Andreas Plate Boundary from 7+ Years of Combined Sentinel-1 InSAR + GNSS Time Series Katherine Guns, Xiaohua Xu, David Sandwell, Yehuda Bock Interferometric Synthetic Aperture Radar (InSAR) datasets have come to revolutionize how we monitor, explore, and characterize crustal processes through surface observations. With the recent rise of increased temporal and spatial resolution... more Themes: Stress and Deformation Over Time \| Community Models	20074
Group A Poster 101	Geology	Seismic Indicators of Fault Maturity Huiyun Guo, Thorne Lay, Emily Brodsky Earthquake generating fault systems span a wide range of fault maturity, from evolving segmented fracture systems with minor offsets to strongly localized primary faults with large cumulative offsets. Many large continental strike-slip earthquakes... more Themes: Special Fault Study Areas: Focus on Earthquake Gates	21175
Group B Poster 124	FARM	The Ingredients Needed for Realistic Dynamic Earthquake Rupture Simulations Ruth Harris Many mysteries about earthquake mechanics remain unsolved, including significant questions about what causes large earthquakes to stop after they have started propagating and which physical processes of the earthquake source are most likely to... more Themes: Modeling Earthquake Source Processes	21127, 20188, 19121, 18217
Group A Poster 261	CXM	Testing Community Velocity Models of Southern California using Gravity Modeling Masooma Hasnain, Simon Klemperer Southern California Earthquake Center (SCEC) has developed two distinct community models, CVM-H and CVM-S, that span Southern California. Many other models have been produced for the same region, e.g. Barak et al. (2015, G-cubed, hereafter BKL-15).... more Themes: Community Models
Group A Poster 057	Seismology	The 1981 – 2022 Southern California Seismic Network Waveform Relocated and Focal Mechanisms Catalogs: New Seismological and Tectonic Insights Egill Hauksson, Peter Shearer We have refined and updated the catalogs of earthquake hypocenters (Hauksson et al., 2012) and focal mechanisms (Yang et al., 2012) for southern California. The SCSN waveform relocated catalog that consists of 40 years of ~800,000 relocated... more Themes: Stress and Deformation Over Time \| Community Models \| Modeling Earthquake Source Processes	22044

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