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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.


The person submitting the abstract is automatically the First Author, and will receive all communications regarding the abstract.

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

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. See the SCEC2020 Poster Session Guide for more detailed information.

Results 51-100 of 248
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SCEC ID Category Title and Authors SCEC Award
Poster 131
FARM Composition and structure in the upper 2-4 km of major strike-slip faults
James Evans, Kaitlyn Crouch, Caroline Studnicky
Inversions of coseismic slip on continental strike slip faults show that maximum slip occurs at depths of 3-5 km, and above these depths fault slip decreases to ~ 50% of their maxima. Hypotheses to explain this slip deficit, and its long-term... more
Poster 232
EEII Critical assessment of probabilistic seismic demand analysis of ordinary bridge structures using Cybershake simulations
Jawad Fayaz, Sanaz Rezaeian, Farzin Zareian
There is a need for benchmarking and validating simulated ground motions for utilization by the engineering community. The validation method presented herein focuses on bridge engineering applications in Southern California. Catalogs of simulated... more
CS Combining CNN and RNN in Seismic Phase Picking
Tian Feng, Lingsen Meng
The recent expansion of seismic data and computing resources enables flourishing applications of deep learning in seismology. Many studies aim at automatically picking P and S arrivals, especially interested in microseismicity buried under noises.... more

Poster 007
Geology Preliminary observations of Mw 5.1 Sparta (North Carolina) surface deformation – a first documented Mw 5 instrumental earthquake surface rupture in Eastern USA?
Paula Figueiredo, Mark Carter, Bart Cattanach, Thomas Douglas, Jesse Hill, Eric Kirby, David Korte, Ashley Lynn, Arthur Merschat, Lewis Owen, Corey Scheip, Kevin Stewart, Sarah Wells, R. Wooten
A Mw 5.1 earthquake near Sparta in North Carolina occurred on 08/09/2020. Preliminary estimates by the USGS have its focal depth at 7.6 km with a NW-SE reverse with oblique mechanism. The earthquake is the strongest recorded in North Carolina since... more

Poster 071
Seismology Ground Motion Response Study of Urban Los Angeles following the 2019 Ridgecrest Earthquake Sequence
Filippos Filippitzis, Monica Kohler, Thomas Heaton, Robert Graves, Robert Clayton, Richard Guy, Julian Bunn, Kanianthra Chandy
We study ground motion response in urban Los Angeles during the two largest events (M7.1 & M6.4) of the 2019 Ridgecrest earthquake sequence, using recordings from multiple regional seismic networks as well as a subset of stations from the much... more

GM Data-Driven Ground Motion Synthesis using Deep Generative Models
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

Poster 170
CXM Current status and future plans for the Community Geodetic Model (GNSS) products
Michael Floyd, Thomas Herring, Zheng-Kang Shen, Jessica Murray, William Hammond, Mark Murray
The Community Geodetic Model (CGM; https://www.scec.org/research/cgm) provides two sets of geodetic products, using GNSS and InSAR, and will ultimately provide a combined geodetic velocity field over southern California for use by the earthquake... more
20092, 20182
Geodesy Results from the geodetic response to the 2019 Ridgecrest earthquakes
Gareth Funning
The July 2019 Ridgecrest earthquakes set new standards for the amount and quality of geodetic observations of large continental earthquakes. A rapid field response by several groups led to a dense deployment of campaign GNSS instruments around the... more
Poster 158
FARM 3D dynamic rupture modeling with thermal pressurization
Alice-Agnes Gabriel, Jagdish Vyas, Thomas Ulrich, Jean-Paul Ampuero, Martin Mai
Thermal pressurization of pore fluids (TP, Sibson 1973) is expected to be a dominant dynamic weakening mechanism affecting earthquake rupture nucleation, propagation and arrest (e.g., Noda et al., 2009, Viesca and Garagash, 2015, Nir et al., 2020).... more

Seismology Basin Structure Revealed in Teleseismic Receiver Functions from a Dense Nodal Seismic Array in the Northern Los Angeles Basins
Ritu Ghose, Patricia Persaud, Robert Clayton
As part of the BASIN (Basin Amplification Seismic Investigation) project, we are mapping the structure of the San Gabriel (SG) and San Bernardino (SB) basins. We are analyzing results from 232 nodal seismic stations installed along 5 profiles in the... more
19033, 18029
Poster 025
SAFS Detecting creep event propagation along the San Andreas Fault
Dan Gittins, Jessica Hawthorne
The San Andreas Fault creeps at the surface along a 150 km-long section between San Juan Bautista and Parkfield. This creep occurs in bursts known as creep events. The creep events are well-recorded using decades-long USGS creepmeter records, but... more

Seismology Injection-induced seismicity in the Raton Basin from 2016-2020
Margaret Glasgow, Ruijia Wang, Brandon Schmandt, Eric Kiser
Wastewater injection-induced seismicity has been active in the Raton Basin for the past two decades, including several M>4.0 normal-faulting earthquakes. To characterize regional fault structures, we systematically analyzed two datasets: 1) an 8-... more

Geodesy Distinguishing the Coseismic Phase of the Earthquake Cycle 
with Seismogeodesy
Dorian Golriz, Yehuda Bock, Xiaohua Xu
Inversions for earthquake source and fault slip distribution models rely on reliable static surface displacements from GNSS stations. Recent studies have also demonstrated the utility of peak-ground-displacement in rapid magnitude estimation.... more

FARM Investigating the Role of Seismic Waves on Multi-fault Rupturing
Hector Gonzalez-Huizar, Roby Douilly
This project seeks to assess the effect of dynamic triggering of multi-fault rupture with application to the Cajon Pass area. Dynamic triggering on a fault occurs when the passing of seismic waves alters the mechanical state or properties of the... more
Poster 112
Geodesy Expanding the GeoGateway Science User Community
Lisa Grant Ludwig, Megan Mirkhanian, Andrea Donnellan, Jay Parker
Science gateways allow research communities to access shared data, software and services. GeoGateway (http://geo-gateway.org) is a science gateway that provides online tools for analysis, and modeling of crustal deformation using geodetic imaging... more

Poster 206
GM 3D Simulation of Near Fault Ground Motions for the 2019 M7.1 Ridgecrest, CA Earthquake
Robert Graves, Arben Pitarka
We perform a suite of 3D ground motion simulations of the 2019 M7.1 Ridgecrest, CA earthquake to test the ability of the Graves and Pitarka (2016) kinematic rupture generator to model the main features of the near-fault recordings. In this work, we... more

EFP A Stress-Similarity Triggering Model for Aftershocks of the Mw 6.4 and 7.1 Ridgecrest Earthquakes
Jeanne Hardebeck
The July 2019 Mw 6.4 and 7.1 Ridgecrest earthquakes triggered numerous aftershocks, including clusters of off-fault aftershocks in an extensional stepover of the Garlock fault, near the town of Olancha, and near Panamint Valley. The locations of the... more

FARM Dynamic Rupture Scenarios of Large Earthquakes on the Rodgers Creek-Hayward-Calaveras-Northern Calaveras Fault System, California
Ruth Harris, Michael Barall, David Ponce, Diane Moore, Russell Graymer, David Lockner, Carolyn Morrow, Gareth Funning, Donna Eberhart-Phillips
The Rodgers Creek-Hayward-Calaveras-Northern Calaveras fault system in California dominates the hazard posed by active faults in the San Francisco Bay Area. Given that this fault system runs through a densely populated area, a large earthquake in... more

Poster 179
CXM The SCEC Community Rheology Model (CRM)
Elizabeth Hearn, Michael Oskin, Greg Hirth, Laurent Montesi, Wayne Thatcher, Whitney Behr, Edric Pauk
The first version of the SCEC Community Rheology Model (CRM) is now complete. The CRM comprises a three-dimensional geologic framework model (GFM) of southern California’s lithosphere, and ductile flow laws for each GFM rock type. Together with... more
Poster 087
EFP Inconsistencies and lurking pitfalls in the magnitude-frequency distribution of high-resolution earthquake catalogs
Marcus Herrmann, Warner Marzocchi
Earthquake catalogs describe the distribution of earthquakes in space, time, and magnitude, which is essential information for statistical analysis, earthquake forecasting, and seismic hazard/risk assessment. With the availability of high-resolution... more

Poster 006
Geology Surface rupture of the Little River fault in response to the August 9, 2020 Mw 5.1 earthquake near Sparta, North Carolina
Jesse Hill, Bart Cattanach, Thomas Douglas, Paula Figueiredo, Eric Kirby, David Korte, Ashley Lynn, Arthur Merschat, Lewis Owen, Corey Scheip, Kevin Stewart, Sarah Wells, Richard Wooten
On August 9, 2020, a Mw 5.1 earthquake shook the Blue Ridge Mountains south of Sparta, North Carolina, causing damage to buildings and pavement. It formed surface ruptures attributed to slide-related failures in anthropogenic fill and to a SSW-... more

CXM Updating the USGS San Francisco Bay Area 3D Seismic Velocity Model: Special Focus on the North Bay
Evan Hirakawa, Brad Aagaard
We present the latest developments on our evaluation and adjustments to the USGS San Francisco Bay Area 3D Velocity Model, with the goal of more closely replicating observed seismic records with 3D ground-motion simulations. In previous work, we... more

Poster 136
FARM Regional earthquakes that trigger creep on the northern central San Andreas fault
Brenton Hirao, Heather Savage, Emily Brodsky
The central San Andreas fault (cSAF) between San Juan Bautista and Parkfield fails in episodic, aseismic creep events. Episodic creep is still one of the most poorly understood aspects of fault motion. In particular, the interaction between creep... more

Poster 011
Geology Geologic Effects of the March 2020 M 5.7 Magna, Utah, Earthquake
Adam Hiscock, Emily Kleber, Greg McDonald, Rich Giraud, Ben Erickson, Jessica Castleton, Steve Bowman, Gordan Douglass, Adam McKean
The March 18, 2020 M 5.7 Magna, Utah, earthquake was the most widely felt earthquake in an Intermountain West urban area in recent history. This normal-faulting earthquake occurred in the northwest part of Salt Lake Valley, home to over 1.2 million... more

Seismology Revisiting California’s Past Great Earthquakes and Long-Term Earthquake Rate
Susan Hough
We revisit the three largest historical earthquakes in California – the 1857 Fort Tejon, 1872 Owens Valley, and 1906 San Francisco earthquakes -- to review their published moment magnitudes, and compare their estimated shaking distributions with... more

Poster 124
SDOT Interplay between seismicity and hydrological and industrial processes in Salt Lake Valley, Utah
Xie Hu, Roland Bürgmann, Liang Xue, Yuning Fu, Teng Wang
A M5.7 earthquake hit the metropolitan Salt Lake Valley (SLV) on March 18th, 2020 during the COVID-19 pandemic. The shaking certainly added more worries to ~3 million people within a 160-km radius of the capital Salt Lake City. The M5.7 earthquake... more

GM 3D 0-5 Hz Wave Propagation Simulations of the 2014 Mw5.1 La Habra Earthquake with Small-scale Heterogeneities, Q(f) and topography
Zhifeng Hu, Kim Olsen
We perform a suite of 0-5 Hz deterministic simulations of the 2014 Mw 5.1 La Habra, CA, earthquake, with the parallel AWP-ODC-GPU code in a mesh from the Southern California Earthquake Center (SCEC) Community Velocity Model CVM-S4.26-M01. The finite... more

Poster 076
Seismology Coseismic hydrogeologic response to the 2019 Ridgecrest Earthquake in the fault system at Devils Hole, Nevada
Ruei-Jiun Hung, Matthew Weingarten
Hydrogeologic responses to earthquakes, either statically or dynamically, are well-documented. Such responses provide information about physical properties of subsurface material and structure. Devils Hole, a fluid-filled fault cavern located in... more

Seismology Investigating the role of thermo-poro-elastic stresses and deformation on induced seismicity
Kyungjae Im, Jean-Philippe Avouac, Elias Heimisson, Derek Elsworth
We investigate the influence of thermo- and poro-elastic stresses on induced seismicity in the context of geothermal energy production at Coso and Brawley in California. Coso geothermal field is one of the largest geothermal fields operated for ~30... more
EFP The Effect of Catalog Lead Time on Earthquake Forecasting Using the EEPAS Model
Sepideh J Rastin, David Rhoades, Annemarie Christophersen
‘Every Earthquake a Precursor According to Scale’ (EEPAS) is a catalog-based model to forecast earthquakes within the coming months, years and decades, depending on magnitude. EEPAS performs well for seismically active regions including California... more

EFP Grand challenges in earthquake science
David Jackson
After two decades of productive SCEC research, important basic questions remain. After another two decades, they may yet remain. Or, some outstanding earthquake research center might plan long-term experiments to address the questions head-on.... more
Poster 218
GM Refinements of UCSB Method Using a Double-Corner Frequency Source Spectrum
Chen Ji, Ralph Archuleta
A realistic spectral model of the general f^(-2) high-frequency and M_0 low-frequency asymptotes needs an intermediate f^(-1) branch (Brune, 1970). We introduced two such double-corner source spectral models JA19 and JA19_2S for 3.3≤ M ≤7.3,... more
Seismology Determination of Near Surface Shear-Wave Velocities in the Central Los Angeles Basin with Dense Arrays
Zhe Jia, Robert Clayton
The shallow velocity structure of the Los Angeles (LA) Basin plays an important role in the seismic hazard of this populated area. Most existing velocity models of the LA Basin are derived from sonic logging, industry reflection profiles or sparse... more

SDOT Using Postseismic Relaxation Test Southern California Viscosity Models
Kaj Johnson, Jacob Dorsett, Simone Puel, Thorsten Becker
We continue to develop 3-D heterogeneous viscoelastic static Green's functions (GFs) for deformation in southern California for the SCEC Community Rheology Model. We are testing viscoelastic mantle models using GPS-derived postseismic... more
20149, 19212
Poster 021
SAFS Trona-Ridgecrest Earthquake Sequence and Fault Complex, San Bernardino County
Frank Jordan, Jr., Miles Wagner, Kerry Cato
On July 4th and 5th 2019, two large earthquakes struck the extreme northwest corner of San Bernardino County. The MW6.4 foreshock occurred along branches of a poorly mapped, northeast-striking fault in on the Naval Air Weapons Station (NAWS) China... more

Poster 227
GM Effects of Shallow-Velocity Reductions on 3D Propagation of Seismic Waves
Alan Juarez, Yehuda Ben-Zion
We perform 3D simulations of seismic wavefields to clarify the effects of strong reductions of shallow velocities on long-period seismic waves. The simulations use a reference Community Velocity Model of southern California and a modified version... more

SDOT Detailed study of stress-related borehole features and the stress regime near the Wilmington Blind-Thrust Fault in the Los Angeles area
Justin Kain, Patricia Persaud
To obtain stress constraints near the inferred ~20-km-long Wilmington blind-thrust fault in the southwestern Los Angeles basin, we analyze digital 4- and 6-arm caliper data and resistivity image logs from 36 wells (16 with image logs). The wells are... more
Poster 144
FARM Two timescales of fault stabilization by dilatant hardening: slow slip events followed by prolonged dynamic rupture
Taka Kanaya, Wen-lu Zhu
Triaxial compression experiments were conducted on Fontainebleau sandstone with initial porosities of 4, 6, and 14% at a constant effective pressure of 70 MPa (produced by various combinations of confining and pore pressures) and strain rates... more
Geology Episodic Deformation Along a Blind Thrust in the Past 125 Kyr: The Santa Ynez River fault in the western Transverse Ranges of California
Clay Kelty, Nate Onderdonk
The Santa Ynez River fault is a major regional structure along the central California coast that separates the western Transverse Ranges and the Santa Maria Basin. Because the fault is not exposed at the surface, little is known about its kinematics... more

Seismology The Plum Earthquake Early Warning Algorithm: A Case Study of Two West Coast, USA, Datasets
Debi Kilb, Julian Bunn, Jessie Saunders, Elizabeth Cochran, Sarah Minson, Annemarie Baltay, Colin O'Rourke
The PLUM (Propagation of Local Undamped Motion) earthquake early warning (EEW) algorithm differs from typical source-based EEW algorithms in that it forward-predicts shaking directly from observations. We apply PLUM to two retrospective datasets:... more

Poster 116
SDOT Preseismic and Post-seismic Transient Strain Anomaly Patterns Before and After the 2019 Ridgecrest Earthquake Sequence
Jeonghyeop Kim, Alireza Bahadori, William Holt
Using cGPS displacements of Network of the Americas (NOTA), we quantify horizontal transient strain anomalies in regions near the epicenters of the 2019 Ridgecrest Earthquake Sequences. The preseismic seasonal strain changes in the regions repeat... more
16291, 18228
Poster 013
Geology Role of confinement in coseismic pulverization of sediments: testing the rock record of rupture directivity on the San Jacinto fault
Caje Kindred, William Griffith, Thomas Rockwell
Pulverized fault zone rocks (PFZR) found in damage zones of large strike slip faults have been linked to dynamic earthquake rupture through experimental, numerical, and field based research. Recent observations of damage zone microfractures within... more
Poster 234
EEII Performance Quantification of Tall Steel Braced Frame Buildings Using Rupture-To-Rafters Simulations
Swaminathan Krishnan, Ramses Mourhatch
What is the probability of collapse of tall steel braced frame buildings under San Andreas earthquakes in the next 30 years? Using more than 38000 ground motion histories from simulations of 60 scenario earthquakes on the San Andreas fault with... more

FARM The Cajon pass earthquake gate: clues from synthetic and realistic topography dynamic rupture models
Christodoulos Kyriakopoulos, Baoning Wu, David Oglesby
The Cajon Pass (CP) is a key area for the generation of large earthquakes in southern California and is thought to be an “Earthquake Gate” (EG). EG’s are locations of structural complexity along major faults that, depending on a series of mechanical... more
19223, 20151
Poster 156
FARM Modeling the Rupture Dynamics of Strong Ground Acceleration (>1g) in Fault Stepovers
Holland Ladage, Julian Lozos, Sinan Akciz
Following the July 2019 Ridgecrest earthquakes, multiple field investigators noted that pebble- to boulder-sized rocks had been displaced from their place in the desert pavement along the right-lateral strike-slip M7.1 rupture trace. This implies... more
FARM Resolving simulated sequences of earthquakes and fault interactions
Valere Lambert, Nadia Lapusta
Physics-based numerical modeling of earthquake source processes aims to combine available real-world data and physical principles to improve our understanding of fault behavior. The ultimate aspiration is to develop models that have predictive... more
SDOT Impact of 3D Elastic Structure on Coseismic Green’s Functions for Static Slip Inversion
Leah Langer, Stephen Beller, Jeroen Tromp
Earthquakes often occur in regions with complex elastic structure, such as sedimentary basins and mantle wedges. However, the majority of coseismic modeling studies assume a simplified, often homogeneous elastic structure in order to expedite the... more

FARM Relation between absolute stress levels, rupture style, and seismic radiation on mature faults
Nadia Lapusta, Valere Lambert
Accumulating geophysical evidence, including observations of heat flow, steep angles between inferred principal stress directions and fault traces, and the geometry of thrust-belt wedges, suggests that the shear resistance acting on mature faults... more
Poster 140
FARM Slip response to fluid depressurization constrains fault friction
Stacy Larochelle, Nadia Lapusta, Jean-Paul Ampuero, Frederic Cappa
Fluid injections are ubiquitous in the exploitation of geoenergy resources but can reactivate nearby faults. Whether the ensuing slip is seismic or aseismic and restrained to the fluid-pressurized zone or not is thought to be controlled by the level... more

Poster 090
EFP Statistical Analysis of Paleoseismically Determined Earthquake Recurrence
Winnie Lau, Michael Oskin
We present a statistical analysis of 11 paleoseismic data sets from continental strike-slip faults in California (San Andreas [5], San Jacinto [2], Garlock [2]) and China (Altyn Tagh [1], Haiyuan [1]) to reveal general characteristics of earthquake... more

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.