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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.


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A First Author can have a maximum of one poster and one oral presentation (if invited as a plenary speaker).

Abstracts should not exceed 2,500 characters in length.

Each "poster space" in the online gallery will include general poster information, author contact information, and a PDF of the poster, as well as optional short videos about the poster.

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Results 51-100 of 292
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SCEC ID Category Title and Authors SCEC Award
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

Themes: Stress and Deformation Over Time | Beyond Elasticity | Modeling Earthquake Source Processes

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

Themes: Operational Earthquake Forecasting

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

Themes: Data-Intensive Computing | Modeling Earthquake Source Processes

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

Themes: Data-Intensive Computing

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

Themes: Modeling Earthquake Source Processes

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

Themes: Stress and Deformation Over Time | Community Models

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

Themes: Stress and Deformation Over Time

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

Themes: Stress and Deformation Over Time | Community Models | Probabilistic Seismic Hazard Analysis

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

Themes: Community Models | Data-Intensive Computing

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

Themes: Modeling Earthquake Source Processes

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

Themes: Beyond Elasticity | Modeling Earthquake Source Processes

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

Themes: Ground Motion Simulation

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

Themes: Stress and Deformation Over Time | Induced Seismicity

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

Themes: Stress and Deformation Over Time | Beyond Elasticity | Modeling Earthquake Source Processes

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

Themes: Beyond Elasticity | Modeling Earthquake Source Processes

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

Themes: Stress and Deformation Over Time

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

Themes: Stress and Deformation Over Time | Community Models | Modeling Earthquake Source Processes

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

Themes: Stress and Deformation Over Time

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

Themes: Ground Motion Simulation

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

Themes: Ground Motion Simulation | Probabilistic Seismic Hazard Analysis

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

Themes: Stress and Deformation Over Time | Community Models

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

Themes: Special Fault Study Areas: Focus on Earthquake Gates | Velocity and Rheology of Basin Sediments

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

Themes: Data-Intensive Computing | Beyond Elasticity | Modeling Earthquake Source Processes

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

Themes: Data-Intensive Computing | Ground Motion Simulation

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

Themes: Modeling Earthquake Source Processes

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

Themes: Probabilistic Seismic Hazard Analysis

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

Themes: Velocity and Rheology of Basin Sediments

19033, 18029
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

Themes: Stress and Deformation Over Time | Post-Earthquake Rapid Response

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

Themes: Stress and Deformation Over Time

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

Themes: Community Models

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

Themes: Stress and Deformation Over Time | Induced Seismicity

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

Themes: Stress and Deformation Over Time | Post-Earthquake Rapid Response

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

Themes: Probabilistic Seismic Hazard Analysis | Post-Earthquake Rapid Response

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

Themes: Community Models | Post-Earthquake Rapid Response | Public Education and Preparedness

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

Themes: Risk to Distributed Infrastructure | Public Education and Preparedness | Experiential Learning and Career Advancement

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

Themes: Stress and Deformation Over Time | Community Models

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

Themes: Stress and Deformation Over Time | Probabilistic Seismic Hazard Analysis | Operational Earthquake Forecasting

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

Themes: Stress and Deformation Over Time | Community Models | Operational Earthquake Forecasting

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

Themes: Stress and Deformation Over Time | Community Models | Modeling Earthquake Source Processes

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

Themes: Modeling Earthquake Source Processes

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

Themes: Earthquake Early Warning

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

Themes: Stress and Deformation Over Time | Community Models | Beyond Elasticity

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

Themes: Community Models

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

Themes: Stress and Deformation Over Time

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

Themes: Operational Earthquake Forecasting

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

Themes: Ground Motion Simulation | Velocity and Rheology of Basin Sediments

The Southern California Earthquake Center is committed to providing a safe, productive, and welcoming environment for all participants. We take pride in fostering a diverse and inclusive SCEC community, and therefore expect all participants to abide by the SCEC Activities Code of Conduct.