Meeting Abstracts | Southern California Earthquake Center

SCEC2021 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 292

SCEC ID	Category	Title and Authors	SCEC Award
Poster 152	FARM	Modeling sequences of seismic and aseismic deformation in a nonlinear viscoelastic megathrust Luca Dal Zilio, Nadia Lapusta, Jean-Philippe Avouac, Taras Gerya A major goal in earthquake physics is to develop a constitutive framework for fault slip that captures the dependence of shear strength on sliding velocity, nonlinear rheology, and temperature. In this study, we present VELO2CYCLEs (Visco-ELastO 2-D... more
Poster 265	EFP	Towards Flexible and Scalable Earthquake Forecasting Kelian Dascher-Cousineau, Oleksandr Shchur, Emily Brodsky The growth in scale and diversity of earthquake catalogs currently outpaces the development of standard statistical models. Yet, the recognition of a full spectrum of slip calls for a model framework with the capacity to both incorporate or infer... more
Poster 124	FARM	Uncertainty Quantification of Dynamic Rupture Modeling Eric Daub, Hamid Arabnejad, Derek Groen We present a demonstration using a surrogate-model based Uncertainty Quantification (UQ) approach to study dynamic earthquake rupture on a rough fault surface. The UQ approach performs model calibration where we choose simulation points, fit and... more
Poster 239	Seismology	When Water, Temperature, and Earthquakes impact shallow seismic velocities: Decadal records in California and Mexico City Marine Denolle, Tim Clements, Laura Lermert The Earth’s near-surface is the buffer zone between the atmosphere and the solid Earth. It is greatly affected by atmospheric conditions (e.g., temperature, pressure, precipitation), shallow hydrology, and the transient effects of seismic activity.... more
Poster 198	Seismology	Stress Drop in Ridgecrest Sequence Events from the Generalized Inversion Technique Emma Devin, Grace Parker, Annemarie Baltay, Tara Nye, Valerie Sahakian We estimate stress drops for earthquakes in the 2019 Ridgecrest sequence using the generalized inversion technique of Andrews (1986). Stress drop is an earthquake parameter that characterizes high frequency seismic radiation and the amount of energy... more
Poster 107	Geodesy	Mechanical Modeling Faulting in the Transverse and Peninsular Ranges of Southern California Savannah Devine, Scott Marshall The greater Los Angeles, California region lies within the Transverse and Peninsular Ranges of southern California and hosts numerous seismically active faults. Here, we present results from three-dimensional Boundary Element Method (BEM) models... more
Poster 202	Seismology	Understanding the physical properties of the Kilauea volcano by analyzing Long-Period volcanic earthquakes Monica Diaz, Zachary Ross, John Wilding Long-period volcanic earthquakes are a vital resource in volcano seismology. These events are associated with deformational changes and the dynamics of volcanoes that lead to predictions of seismic hazard events. This project performs an analysis of... more
Poster 156	FARM	Characterizing shallow slow slip with natural and experimental hematite fault surfaces Alexandra DiMonte, Alexis Ault, Greg Hirth, Cameron Meyers Exhumed hematite fault surfaces record microstructural and chemical signatures, including (U-Th)/He dates and He loss patterns, associated with mineralization and prior slip at depth. Comparisons with experimental slip surfaces refine slip rates and... more	21068, 15111
Poster 076	Geology	Comprehensive 3D model of the Ventura-Pitas Point fault system and associated structures in the Santa Barbara Channel and Ventura basin for the CFM Jessica Don, John Shaw, Andreas Plesch The southern extent of the Western Transverse Ranges, in the Santa Barbara Channel and Ventura basin, is home to some of the fastest Holocene uplift and deformation rates in southern California. The faults that accommodate this deformation pose some... more	21009
Poster 008	CXM	CANVAS: An Adjoint Waveform Tomography Model of California and Nevada Claire Doody, Arthur Rodgers, Christian Boehm, Michael Afanasiev, Lion Krischer, Andrea Chiang, Nathan Simmons Full waveform inversion models are instrumental to elucidating earthquake processes in seismically active places like California. In an effort to better model waveforms in California, we present the California-Nevada Adjoint Simulations (CANVAS)... more
Talk 14-Sep (15:00)	FARM	Investigating the Influence of Topography on Rupture Propagation along Fault Stepovers Roby Douilly Complex fault systems are often located in regions with asymmetric topography, and these systems are very common in Southern California. As an example, the eastern portion of the left-lateral Garlock fault system, which is composed of two segments... more
Poster 132	FARM	Impulsive Tsunami and Large Runup Along the Sanriku Coast of Japan Produced by an Inelastic Wedge Deformation Model Yue Du, Shuo Ma, Tatsuya Kubota, Tatsuhiko Saito Dynamic wedge failure produces short-wavelength seafloor uplift efficiently with diminishing shallow slip on the plate interface, generating impulsive tsunami. For ria coasts with prevalent small-wavelength bathymetric and geomorphologic features,... more
Poster 046	GM	Topographic control of ground motions and landslides from the 2015 Gorkha earthquake Audrey Dunham, Eric Kiser, Jeffrey Kargel, Umesh Haritashya, Scott Watson, Dan Shugar, Amanda Hughes, Peter DeCelles Landslides caused by seismic shaking are a common secondary hazard of earthquakes, particularly in high mountainous regions where rugged topography predisposes the landscape to failure. Topography can also amplify the wavefield by focusing seismic... more
Poster 175	FARM	Rate-and-state modeling of injection-induced aseismic slip in the Delaware Basin No'am Dvory, Yuyun Yang, Eric Dunham Fluids injection into the subsurface raises the pore pressure and may induce seismicity. However, in numerous sites, injection is not accompanied by earthquakes. Moreover, in some areas of active injection and seismicity, seismic slip alone can not... more
Talk 15-Sep (11:00)	FARM	Towards modeling sequence of earthquakes and aseismic slip (SEAS) with high resolution fault zone physics Ahmed Elbanna, Mohamed Abdelmeguid, Md Shumon Mia, Xiao Ma An active fault zone is home to a plethora of complex structural and geometric features that are expected to affect earthquake rupture nucleation, propagation, and arrest, as well as interseismic deformation, energy partitioning, radiation patterns... more
Poster 154	FARM	Modeling Inelastic deformations in fault zones: From discrete to distributed damage Ahmed Elbanna, Alice-Agnes Gabriel, Yehuda Ben-Zion The internal structure of fault zones in the upper crust exhibits considerable complexity. There are variations along strike in the form of bends and segmentation, and with depth due to changes in deformation mechanisms. Large faults have several... more	21112
Poster 121	SDOT	Combining forward and inverse approaches to resolve interseismic deep slip and locking depths on closely spaced faults Hanna Elston, Michele Cooke, Jack Loveless, Scott Marshall Inversions of interseismic surface velocities alone often struggle to uniquely resolve the fault slip rate distribution in systems with branching or closely spaced faults, such as the southern San Andreas fault (SAf). Local stress states inferred... more	21020
Poster 145	FARM	Community Code Verification Exercises for Simulations of Earthquake Sequences and Aseismic Slip (SEAS): Dynamic Effects and Dipping Fault Geometries Brittany Erickson, Junle Jiang, Mohamed Abdelmeguid, Martin Almquist, Jean-Paul Ampuero, Ryosuke Ando, Sylvain Barbot, Camilla Cattania, Alexandre Chen, Luca Dal Zilio, Eric Dunham, Ahmed Elbanna, Alice-Agnes Gabriel, Tobias Harvey, Yihe Huang, Yoshihiro Kaneko, Jeremy Kozdon, Valere Lambert, Nadia Lapusta, Duo Li, Meng Li, Chao Liang, Yajing Liu, So Ozawa, Casper Pranger, Paul Segall, Yudong Sun, Prithvi Thakur, Carsten Uphoff, Ylona van Dinther, Yuyun Yang The use of numerical modeling to advance our understanding of earthquake dynamics and inform seismic hazard assessment relies fundamentally on credible, reproducible model results. Single-event dynamic rupture simulations have been extensively used... more	18099, 19109, 20113, 21065
Poster 176	FARM	Phase-field modeling of rate- and state-dependent frictional faults Fan Fei, Md Shumon Mia, Ahmed Elbanna, Jinhyun Choo Handling the complex geometry of discontinuous surfaces is often a formidable challenge in computational simulation of fault rupture. To address this challenge, here we introduce a phase-field approach to the simulation of fault rupture dynamics,... more
Poster 031	GM	Spectral Scaling Transfer Function Method for Scenario Ground Motion Simulation with Application to the 2019 Ridgecrest Earthquake Sequence Filippos Filippitzis, Monica Kohler, Anthony Massari, Becky Roh, Thomas Heaton A new spectral scaling transfer function-based approach is presented for simulating ground motions for scenario large-magnitude earthquakes when a smaller-magnitude earthquake from the same source region has been recorded. This method is based on... more
Poster 038	GM	Data-driven synthesis of broadband earthquake ground motions using artificial intelligence Manuel Florez, Michaelangelo Caporale, Buabthong Pakpoom, Zachary Ross, Domniki Asimaki, Men-Andrin Meier Robust estimation of ground motions generated by scenario earthquakes is critical for many engineering applications. We leverage recent advances in Generative Adversarial Networks (GANs) to develop a new framework for synthesizing earthquake... more
Talk 17-Sep (08:00)	CXM	Current status and future of the Community Geodetic Model Michael Floyd On behalf of the Community Geodetic Model (CGM) Working Group, I present the current status of the CGM and future plans and challenges. The CGM provides the SCEC community, and beyond, with Earth surface displacements and velocities from two... more	21026, 20182, 20074, 20177, 20198, 20016, 19234
Poster 062	Geology	At least twelve event Holocene to late Pleistocene paleo-earthquake record on the central Garlock fault at Koehn Lake, southern California Dannielle Fougere, James Dolan, Chris Anthonissen, Judith Gauriau, Andrew Ivester, Sally McGill, Ed Rhodes To improve the paleo-earthquake record of the Garlock fault, a major sinistral strike-slip fault that extends approximately E-W across the Mojave Desert in southeastern California, we revisited a paleo-seismic site at Koehn Lake on the west-central... more
Poster 084	SAFS	New insights on subsurface fault and geologic structure at Loma Prieta, central California Gary Fuis, Rufus Catchings, Mark Goldman, Daniel Scheirer, Tait Earney, Klaus Bauer, Edward Zhang In light of recent interpretations of a two-part dip for the San Andreas fault (SAF) in the Coachella Valley, of southern California, we have compiled data sets and analyses in the vicinity of the 1989 Mw 6.9 Loma Prieta earthquake, in central... more
Poster 001	CEO	Seismica: a community-led Diamond Open-Access journal for seismology and earthquake science Gareth Funning, Lucile Bruhat, Martijn van den Ende, Alice-Agnes Gabriel, Stephen Hicks, Romain Jolivet, Thomas Lecocq, Christie Rowe Seismica is an effort to establish a Diamond Open-Access (OA) journal for the community of researchers working in the (broadly defined) fields of seismology and earthquake science. Diamond OA journals are free to read, do not charge authors to... more
Poster 028	CS	High-performance computing and multi-physics earthquake modeling towards next generation earthquake simulations Alice-Agnes Gabriel, Ahmed Elbanna, Yehuda Ben-Zion Earth modeling is highly complex – and when the earth quakes, there are additional dynamic complexities. While computational seismology has been a pioneering field for high-performance computing, earthquake source processes are very ill-constrained... more	21112
Poster 196	Seismology	Seismic Wave Propagation and Inversion with Neural Operators Angela Gao, Yan Yang, Jorge Castellanos, Zachary Ross, Kamyar Azizzadenesheli, Robert Clayton Seismic wave propagation forms the basis for most aspects of seismological research, yet solving the wave equation is a major computational burden that inhibits the progress of research. This is exaspirated by the fact that new simulations must be... more
Poster 104	Geodesy	Three-dimensional off-fault deformation patterns of the Mw 6.6 1971 San Fernando, California earthquake Elyse Gaudreau, James Hollingsworth, Edwin Nissen, Gareth Funning The distribution of on- and off-fault coseismic surface deformation along a fault zone provides information on earthquake behavior and fault zone evolution. However, few off-fault deformation studies have focused on thrust faults, in part because of... more	21128
Poster 249	EFP	Relative structural complexity of plate boundary fault systems controls incremental slip-rate behavior of major strike-slip faults Judith Gauriau, James Dolan A comparison of published incremental fault slip rates from four major plate-boundary strike-slip faults with the proximity and number of other neighboring active faults shows that the behavior of the master fault is strongly correlated with the... more
Poster 221	Seismology	High-Frequency Receiver Function Profiles Reveal Sedimentary Basin Structure Beneath the Northern Los Angeles Area Ritu Ghose, Patricia Persaud, Yida Li, Valeria Villa, Robert Clayton We determine the structure of the San Gabriel, Chino and San Bernardino basins using receiver functions computed along 10 seismic lines of the BASIN (Basin Amplification Seismic Investigation) project. The dataset is comprised of ~790 densely-spaced... more	19033, 18029
Poster 236	Seismology	2019 Ridgecrest earthquake sequence: RAPID seismic deployment and a new aftershock catalog based on machine learning Abhijit Ghosh, Yijian Zhou, Shankho Niyogi, Manuel Mendoza, Kuntal Chaudhuri, Baoning Wu, Han Yue, Lihua Fang, Shiyong Zhou, Andrew Birkey We installed a temporary seismic network immediately after the Mw 7.1 Ridgecrest earthquake in 2019. The first station went in within a day of the mainshock. There are 20 seismic stations that were operated in continuous mode for up to 1 year. They... more
Poster 134	FARM	Are creep events big? Estimating their rupture extents. Dan Gittins, Jessica Hawthorne Fault creep is observed along many faults worldwide (Titus et al., 2011). Aseismic slip does not always accumulate at a steady background rate; instead, it accumulates in bursts known as creep events (Gladwin et al., 1994). Despite observations of... more
Poster 013	CXM	Shallow crustal structure of Southern California by jointly inverting surface wave phase velocity, Rayleigh wave ellipticity, and Receiver Functions Konstantinos Gkogkas, Elizabeth Berg, Fan-Chi Lin, Vera Schulte-Pelkum, Amir Allam, Hongrui Qiu An accurate and high-resolution shallow crustal model is important for understanding ground motion amplification and hence regional seismic hazard. In this study we present a new shear velocity (Vs) crustal model of the Southern California region by... more	21116, 20058, 17097
Poster 123	FARM	More than 40 years of potentially induced seismicity close to the San Andreas fault in San Ardo, central California Thomas Goebel, Manoochehr Shirzaei Evidence for fluid injection-induced seismicity is rare in California hydrocarbon basins, despite wide-spread injection close to seismically active faults. We investigate a potential case of injection-induced earthquakes associated with San Ardo... more	21008
Talk 14-Sep (08:00)	Geology	Coseismic surface rupture: insights from field and satellite observations Ryan Gold High-resolution satellite observations provide unprecedented constraints on surface-rupturing earthquakes, yielding detailed insight into the patterns of localized and distributed faulting extending multiple kilometers across the rupture zone. Field... more
Poster 203	Seismology	Minimizing Geophysical Site Characterization Procedures to Estimate VS30 through the Use of VR40 Jose Gomez, Alan Yong VS30, the time-averaged shear wave velocity of the upper 30 m from the ground surface, is typically calculated from shear-wave velocity (VS) profiles. VS profiles are often determined by expensive and invasive borehole-based methods; or most... more
Poster 044	GM	Database of Fragile Geologic Features from the Trona Pinnacles National Monument Christine Goulet, Xiaofeng Meng, Savannah Devine The definition of ground motion upper limits is a key knowledge gap for the design of critical infrastructure such as power plants or dams. Fragile geologic features (FGFs) that are damaged or toppled by strong earthquake shaking can provide insight... more	20119
Poster 002	CEO	Using GeoGateway to access NASA Earth Science data for teaching Lisa Grant Ludwig, Megan Mirkhanian, Andrea Donnellan, Jay Parker, Jun Wang, Marlon Pierce NASA’s airborne- and satellite-based instruments provide Earth science data for understanding natural disasters, tectonic processes and environmental change. NASA data are free and openly accessible for students and instructors but can be... more
Talk 15-Sep (15:00)	CEO	Pandemic lessons for earthquake resilience Lisa Grant Ludwig Since March 2020 we have all been enrolled in a crash course on pandemic infectious disease. This experiential learning course has been costly, paid with lives, livelihoods, and our collective sense of wellbeing. With such a steep price, it is... more
Poster 099	Geodesy	Pre-, Co- and Postseismic GNSS-Corrected Sentinel-1 InSAR Time Series: Moving Beyond the 2019 Ridgecrest, CA Earthquake Sequence Katherine Guns, Xiaohua Xu, David Sandwell, Yehuda Bock Interferometric Synthetic Aperture Radar (InSAR) time series methods have become a powerful resource for studying deformation processes occurring on Earth’s surface, particularly in arid environments like those in southern California. One existing... more	20074
Poster 252	EFP	Re-evaluation of the role of static stress triggering for aftershocks following the Ridgecrest, California earthquake sequence considering receiver plane uncertainty Catherine Hanagan, Richard Bennett, Amanda Hughes Static stress transfer from preceding earthquakes is commonly invoked as the primary mechanism for triggering aftershocks, but evaluation of this mechanism depends on aftershock rupture plane orientations and hypocenter locations, which are often... more
Poster 255	EFP	What Physical Properties Control Aftershock Locations? Jeanne Hardebeck Aftershocks do not uniformly surround a mainshock, and instead occur in spatial clusters. Some of this spatial clustering may be due to secondary aftershock triggering, although only about half of aftershock are secondary, so this can’t be the only... more
Poster 167	FARM	Exploring the effects of a sedimentary basin on the earthquake cycle using a non-stiff finite difference method for elastodynamics Tobias Harvey, Brittany Erickson, Jeremy Kozdon Geodetic observations of long term slip on faults cutting through sedimentary basins often do not match geologic estimates. These discrepancies might be partially resolved by the heterogeneous structure of sedimentary basins, which, in addition to... more
Poster 186	Seismology	Brawley Seismic Zone, Dextral Transcurrent and Rift Tectonics Connecting the San Andreas and Imperial Faults Across the Salton Trough, Southern California, USA Egill Hauksson, Joann Stock, Allen Husker We analyze 40 years of seismicity in the (BSZ) Brawley Seismic Zone to elucidate its current mode of crustal deformation. The 30 km long BSZ extends south-southeast across the Salton Trough, from the southernmost tip of the San Andreas fault (SAF)... more
Poster 245	Seismology	A Low-Cost Internet-of-Things Device for Earthquake Early Warning Vivien He, Robert Clayton A low-cost Internet-of-Things (IoT) device for earthquake early warning (EEW) was presented at the Seismological Society of America (SSA) Annual Meeting in April 2021. The IoT device is integrated with a geophone, alarm, wifi, and customized... more
Poster 112	SDOT	San Andreas Fault seismic-cycle models incorporating viscous shear zones and the SCEC Community Rheology Model (CRM) Elizabeth Hearn I have developed models of northern and southern San Andreas Fault (SAF) seismic cycles to estimate how much viscoelastic effects perturb present-day surface velocities relative their mean interseismic values. These perturbations (or "ghost... more	20190
Talk 17-Sep (08:00)	CXM	The SCEC Community Rheology Model: A modular resource for investigating the effective viscosity structure of southern California Elizabeth Hearn, Laurent Montesi, Greg Hirth, Michael Oskin, Whitney Behr, Wayne Thatcher The SCEC Community Rheology Model (CRM) comprises a 3D geologic framework model (GFM) of southern California’s lithosphere, and ductile flow laws for each GFM rock type. The GFM is shared as coordinates for 23 lithotectonic province boundaries,... more	20190
Poster 126	FARM	Damage Zone Patterns Along Creeping Faults in the Navajo Sandstone, Utah Michael Hernandez, Alba Rodriguez Padilla, Michael Oskin Faults that creep at a constant rate impose a steady influx of stress to their tips. The Needles Fault District and the Moab Fault Zone form arrays of normal faults cutting the Navajo Sandstone (Utah) that experience steady-state creep related to... more
Poster 266	EFP	b-value of what? Complex behavior of the magnitude distribution during and within the 2016/17 Central Italy sequence Marcus Herrmann, Ester Piegari, Warner Marzocchi The Magnitude–Frequency-Distribution (MFD) of earthquakes is a major ingredient for earthquake forecasting and seismic hazard models. It is typically modeled with the Gutenberg–Richter (GR) relation and its b-value (slope of the GR relation) to... more
Poster 011	CXM	Updates for San Francisco Bay Sediments in the USGS SF-CVM and Simulation of Long-Duration Shaking in the East Bay Plain Evan Hirakawa, Brad Aagaard We update seismic velocities for Quaternary sediments in the Central Bay Block of the USGS San Francisco Bay Region 3D Seismic Velocity Model (SF-CVM), with the goal of more accurately simulating long-duration reverberations in the East Bay Plain as... more

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SCEC2021 Meeting Abstracts

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