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PROGRAM TRAVEL REGISTRATION ABSTRACTS PARTICIPANTS

Meeting Abstracts

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 form below to search and view all poster and invited talk abstracts submitted to this meeting.


  
  

A SCEC username is required to submit an abstract.

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

First Authors can submit a maximum of one poster presentation abstract and one oral presentation abstract (if invited as a plenary speaker).

Abstracts should not exceed 2,500 characters in length.

Every poster will be on display from Sunday evening through Tuesday evening.

Poster dimensions cannot exceed 45 inches high x 45 inches wide.

You may upload a PDF of your poster at any time, even after the submission deadline.

Results 51-100 of 336
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SCEC ID Category Title and Authors SCEC Award
Poster
084
Seismology A focal mechanism catalog for Southern California derived with deep learning algorithms
Yifang Cheng, Zachary Ross, Egill Hauksson, Yehuda Ben-Zion
We present an updated focal mechanism catalog for 16,341 events that occurred in southern California during 2017. The approach uses S/P amplitude ratios and first-motion P wave polarities to determine focal mechanisms with the HASH method of... more
19136
Poster
073
Seismology Tremor or train? An attempt to discern tremor and noise using a deep convolutional neural network
Lindsay Chuang, Zhigang Peng, Lijun Zhu, James McClellan
Deep tectonic tremors are often characterized as non-impulsive, low signal-to-noise ratio, long-duration, and lacking in high frequency energy, which can be confused with background or anthropogenic noise. A standard technique to avoid... more
19177
Poster
274
Ridgecrest Performance of the ShakeAlert Earthquake Early Warning System During the Ridgecrest Sequence
Angela Chung, Deborah Smith, Jennifer Andrews, Maren Böse, Jeff McGuire, Men-Andrin Meier, Igor Stubailo, Richard Allen
On July 4, 2019 an earthquake sequence began near Ridgecrest, CA. The sequence began with a M4.0 earthquake followed 30 minutes later by a M6.4 earthquake. Less than 36 hours later, a M7.1 earthquake shook the Los Angeles region. This mainshock was... more

Poster
058
Seismology Ambient noise tomography of the Saudi Arabian Shield
Francesco Civilini, Walter Mooney, Hani Zahran
Saudi Arabia is located in a tectonically active region: spreading occurs to the west and south in the Red Sea rift and the Gulf of Aden and is accommodated by a fold and thrust belt in the Zagros mountains to the north-east. The geology in western... more

Poster
251
Ridgecrest CSN/LAUSD Network: A Dense Accelerometer Network in Los Angeles Schools
Robert Clayton, Monica Kohler, Richard Guy, Julian Bunn, Thomas Heaton, Kanianthra Chandy
The CSN/LAUSD is a network of 300 low-cost MEMS accelerometers located in schools in the Los Angeles, CA region. They are capable of accurately recording strong motion up to ±2g and are sufficiently spatially dense that they provide unaliased... more

Poster
302
CS Cactus to Clouds: Processing the SCEDC Open Data Set on AWS
Tim Clements, Marine Denolle
Data from the Southern California Earthquake Data Center (SCEDC) are now in the cloud! Amazon Web Services (AWS) is currently hosting one year of data (July 2016- July 2017, 552 stations, ~8 TB) from the Southern California Seismic Network as an... more

Poster
093
Seismology Retrospective and real-time event-based performance of the PLUM earthquake early warning algorithm for the West Coast, USA
Elizabeth Cochran, Debi Kilb, Julian Bunn, Sarah Minson, Annemarie Baltay, Mitsuyuki Hoshiba, Yuki Kodera
Using both retrospective and real-time event-based performance assessments, we explore the effectiveness of the Propagation of Local Undamped Motion (PLUM) earthquake early warning (EEW) algorithm, which we previously optimized for southern... more

Poster
281
Ridgecrest Modeling the 2019 Ridgecrest Earthquake Sequence
Jordan Cortez, Christodoulos Kyriakopoulos, Baoning Wu, David Oglesby, Roby Douilly, Gareth Funning, Abhijit Ghosh
The July 2019 Ridgecrest earthquake sequence ruptured two nearly-perpendicular conjugate fault planes within 36 hours of each other. It produced a rich set of aftershocks outlining the ruptured fault surfaces, and triggered events in the Coso... more

Poster
295
EEII Simulation-Informed Site-Specific Design Spectra for Engineers: New Beta Version Including ASCE 7-16, ASCE 41-17 and LATBSDC Standards
C.B. Crouse, Christine Goulet, Thomas Jordan, Kevin Milner, Edric Pauk, Scott Callaghan, Robert Graves
The SCEC Utilization of Ground Motion Simulation (UGMS) committee developed building-code conforming site-specific design spectra for the Los Angeles region. The long period (T ≥ 2-sec) response spectra were computed as the weighted average of... more
19091, 18141, 17233, 16169, 15006
Poster
300
CS Continued Integration and Delivery for AWP-ODC-OS in the public Cloud
Yifeng Cui, Alexander Breuer, David Lenz
Continuous Integration and Delivery (CI/CD) are state-of-the-art software development and engineering techniques that support the process of continuously testing small incremental changes of scientific software. We present the transformation of our... more
19176
Poster
175
FARM Exploring slow slip events and their scaling in 3D simulations of fault slip
Luca Dal Zilio, Nadia Lapusta, Jean-Philippe Avouac
Tectonic faults accommodate a wide spectrum of slip modes, ranging from earthquakes to slow slip events (SSEs). While regular earthquakes are events with rupture velocities governed by inertial stress transfer with elastic wave speeds, the physical... more

Poster
069
Seismology Identification of Overlapping Earthquakes using a moveout-based matching pursuit method
Clara Daniels, Zhigang Peng, James McClellan, Lijun Zhu
The time right after a large earthquake, as well as other periods of increased earthquake activity, can reveal spatio-temporal evolution of seismicity and give insight into the physical mechanism of earthquake triggering and aftershock forecasting.... more

Poster
123
Geology Large Scale Detection of Fault Damage
Kelian Dascher-Cousineau, Emily Brodsky, Noah Finnegan, Alison Duvall
Fault damage zones are inherently difficult to measure, yet determining their presence and size is a cornerstone of earthquake mechanics. We develop tools to couple remote observations of the Earth's topography to deep-seated physical features... more
19226
Talk
Sun 1800
GM Beyond elasticity in ground motion simulations
Steven Day
Traditionally, numerical simulation of strong motion has been based upon a conceptualization of ground motion as a product of separate source, path, and site factors. This approximation is often a very useful fiction for earthquakes of modest... more

Poster
095
Geology First Geologic Slip Rates Along Patagonia's Fastest Slipping Crustal Faults
Gregory De Pascale, Francisca Sandoval, Sebastian Perroud, Mario Persico, Angelo Villalobos
Major strike-slip faults in Patagonia (Chile and Argentina) are first-order elements within the Neotectonic framework of Southern South America. The Liquiñe-Ofqui fault zone (LOFZ) is a intra-volcanic arc dextral structure than is ~1,2000 km-long,... more

Poster
105
Geology An Updated Evaluation of the Rose Canyon Fault, San Diego, California
Michael DeFrisco
The Rose Canyon Fault Zone (RCFZ) extends from La Jolla to San Diego Bay and is the southern, onshore section of the 170-km long Newport-Inglewood/Rose Canyon fault zone. The RCFZ is approximately 20 km in length and is a predominantly right-... more

Poster
164
FARM Table-top nucleation
Sam Dillavou, Vincent Stin, Shmuel Rubinstein
Where and when does an earthquake start? In simulations, important aspects of the dynamics of earthquake nucleation, including slip patch shape and propagation velocity, are determined by the choice of evolution law for the state parameter,... more

Poster
112
Geology Linkage of the Ventura-Pitas Point and Mid-Channel faults and its implications for large, multi-segment earthquakes
Jessica Don, Andreas Plesch, Mattie Newman, John Shaw
The Ventura-Pitas Point fault system, located in the western Transverse Ranges, is one of the largest earthquake sources in southern California. This fault system ruptures in large magnitude events as indicated by Holocene marine terraces which... more
19105
Poster 229
Ridgecrest Targeted High-Resolution Topographic Imaging of Active Faults and the Ridgecrest Earthquake Sequence Ruptures in Southern California
Andrea Donnellan, Gregory Lyzenga, Jay Parker, Adnan Ansar, Christine Goulet, Yehuda Ben-Zion, Frank Vernon, David Lynch
We discuss observations from UAVSAR, small inhabited areal systems (sUAS or drones), and continuous camera streams over active faults, the moving Mundo Mudpot, and the Ridgecrest earthquake sequence ruptures in southern California. We have targeted... more

Poster
236
Ridgecrest Postseismic deformation and stress evolution following the 2019 M 7.1 and M 6.4 Ridgecrest earthquakes
Jacob Dorsett, Kaj Johnson, Simone Puel, Thorsten Becker
The 2019 M 7.1 and M 6.4 Ridgecrest earthquakes present the first opportunity to study ongoing postseismic deformation and crustal stress evolution following a large earthquake in southern California in two decades. Coseismic Coulomb stress changes... more
19212
Poster
117
Geology Older and Deeper Seismic Deformation in the San Gabriel Crystalline Basement Complex Along the South Branch of the Punchbowl Fault
Matthew Dorsey, Judith Chester, Frederick Chester
The main trace of the Punchbowl fault (PF), part of an ancient, exhumed fault zone of the San Andreas system, has been investigated repeatedly to understand the structure and deformation processes of seismic faults at depth. The previous studies... more

Poster
169
FARM Fault Valving and Pore Pressure Evolution in Simulations of Earthquake Sequences and Aseismic Slip
Eric Dunham, Weiqiang Zhu, Kali Allison, Yuyun Yang
Earthquake sequence simulations are becoming widely used to explore faulting behavior, lithospheric stress profiles, and to interpret crustal deformation data. Many quantities predicted by these simulations--stress drop, slip per event, ambient... more
19074
Poster
306
CEO Visualizing Post-Seismic Drought Scenarios: An Analysis of Historical Earthquakes on the San Andreas Fault System
Suzie Duran, Shreya Agrawal, Haydee Portillo, Stephanie Soto, Jose Rico, Elvis Carrillo, Gabriela Noriega, Thomas Jordan
Given the historical period of 1812-1912, when California experienced some of the largest earthquakes recorded on the San Andreas Fault System (SAFS), the current drought seems to be unprecedented and statistically unlikely. To understand the risks... more

Poster
151
FARM Dynamic Rupture Propagation on Fault Planes with Explicit Representation of Short Branches: Stress Heterogeneity, High Frequency Generation, and Novel Supershear Transition Mechanism
Ahmed Elbanna
Active fault zones are homes for a plethora of complex structural and geometric features that are expected to affect earthquake rupture nucleation, propagation, and arrest, as well as interseismic deformation. Simulation of these complexities have... more
18157
Poster
118
Geology Complex ruptures in the historical record, illuminated by photogrammetric topography and analog seismograms
Austin Elliott, Richard Walker, Barry Parsons, Galina Kulikova, Christoph Grützner, Kanatbek Abdrakhmatov, Zhuqi Zhang, Zhikun Ren
Although contemporary earthquakes continue to surprise us with their complexity, violating expectations about rupture length, geometry, and fault involvement, rupture complexity is not a new phenomenon. We simply have not previously had the tools to... more

Poster
194
SDOT Sensitivity of regional interseismic deformation to variations in active fault configuration of the southern San Andreas fault and San Jacinto faults
Hanna Elston, Michele Cooke, Scott Marshall, Jennifer Hatch
Several alternative active fault configurations have been proposed for the San Jacinto and southern San Andreas faults. These alternatives arise in regions where subsurface fault geometry is not well constrained (e.g., Cajon Pass and Indio Hills)... more
19158
Poster
174
FARM The Community Code Verification Exercise for Simulating Sequences of Earthquakes and Aseismic Slip (SEAS)
Brittany Erickson, Junle Jiang, Michael Barall, Nadia Lapusta, Eric Dunham, Ruth Harris, Lauren Abrahams, Kali Allison, Jean-Paul Ampuero, Sylvain Barbot, Camilla Cattania, Ahmed Elbanna, Yuri Fialko, Benjamin Idini, Jeremy Kozdon, Valere Lambert, Yajing Liu, Yingdi Luo, Xiao Ma, Maricela Best Mckay, Paul Segall, Pengcheng Shi, Martijn van den Ende, Meng Wei
Numerical simulations of Sequences of Earthquakes and Aseismic Slip (SEAS) have made great progress over the past decades to address important questions in earthquake physics and fault mechanics. However, significant challenges in SEAS modeling... more
19109, 19110
Poster
004
GM Modeling shallow crustal nonlinearity in physics-based earthquake simulations: Beyond perfect plasticity
Elnaz Esmaeilzadeh Seylabi, Doriam Restrepo, Domniki Asimaki, Ricardo Taborda
In this project, we advance the current SCEC simulation capabilities in deterministic earthquake simulations by implementing an elastoplastic constitutive model in Hercules, one of the SCEC’s High-F simulation software. Our goal is to quantitatively... more
18020
Poster 312
CXM Tectonic regionalization of the Southern California crust from tomographic cluster analysis
William Eymold, Thomas Jordan
We map crustal regions in Southern California that have similar depth variations in seismic velocities by applying cluster analysis to 1.5 million P and S velocity profiles from the three dimensional tomographic model CVM-S4.26. We use a k-means... more

Poster
081
Seismology Teleseismic dynamic triggering of microearthquakes in the Anza area, California: the role of dynamic strain and pore pressure
Wenyuan Fan, Andrew Barbour, Elizabeth Cochran
Teleseismic dynamic triggering has been reported for various fault systems. These dynamically triggered earthquakes are thought to be caused directly by the increasing dynamic stress due to passing seismic waves, or indirectly by transient... more

Poster
249
Ridgecrest Strain-estimated ground motions of recent earthquakes in California
Noha Farghal, Annemarie Baltay
We utilize strain data from the Plate Boundary Observatory (PBO) borehole strainmeter network to estimate peak ground velocities (PGVs) and earthquake magnitudes from dynamic strains recorded during recent earthquakes in California. We show that... more

Poster
064
Seismology Detecting offshore earthquakes with backprojection and matched-filter method
Tian Feng, Lingsen Meng, Hui Huang
To better understand the offshore seismicity and slow slip around recent megathrust earthquakes, we improve the capability of detecting offshore events by combining two recently developed techniques: Backprojection imaging (BP) and matched-filter... more

Poster
128
Geology Seismogenic compression in southern Italy? Morphotectonic analysis to detect possible evidence of Late Quaternary tectonics along the Southern Apennine Outer Front
Federica Ferrarini, Ramon Arrowsmith, Francesco Brozzetti, Rita de Nardis, Daniele Cirillo, Giusy Lavecchia
Earthquakes are a major natural hazard for the Mediterranean area and Italy is one of the countries where they still belong among the deadliest disasters. Earthquakes occurred in the last fifteen years in central-southern Italy (S. Giuliano di... more

Poster
027
EFP Improving Earthquake Rupture Forecasts (Using California as a Guide)
Edward Field
This poster will discuss ways in which earthquake-rupture forecast models might be improved. Because changes are most easily described in the context of specific models, the 3rd Uniform California Earthquake Rupture Forecast UCERF3) and its presumed... more

Poster
231
Ridgecrest SAR Imaging of the Coseismic and Early Postseismic Deformation from the 2019 Mw 7.1 and Mw 6.4 Ridgecrest Earthquakes in California
Eric Fielding, Oliver Stephenson, Minyan Zhong, Simran Sangha, Cunren Liang, Mong-Han Huang, Zhen Liu, Sang-Ho Yun, Mark Simons, Benjamin Brooks
We analyzed synthetic aperture radar (SAR) images from Copernicus Sentinel-1A and -1B satellites operated by the European Space Agency and the Advanced Land Observation Satellite-2 (ALOS-2) satellite operated by Japanese Aerospace Exploration Agency... more

Poster
141
SAFS Preliminary Geochronology data for Cajon Pass Terraces- implications to the regional chronosequence
Paula Figueiredo, Ray Weldon, Lewis Owen, Nate Onderdonk
In Southern California, the two largest fault systems (San Andreas and San Jacinto) converge at the Cajon Pass area. Here a sequence of terraces is displaced by both fault systems and therefore record their evolution and interactions through time.... more
19204
Poster
038
EFP Natural time analysis of quasi-periodic caldera collapse events during the 2018 Kīlauea volcano eruptive sequence
Rebecca Fildes, Donald Turcotte, John Rundle
The period of heightened volcanic and seismic activity occurring at Kīlauea volcano on the island of Hawai’i, USA from late spring through summer 2018 included a remarkable quasi-periodic sequence of caldera collapse events. From early-June to early... more

Talk Wed 0900
Geology Active faulting south of the border; the other half of the big bend domain of the Pacific-North American plate margin
John Fletcher, Alejandro Gonzalez-Ortega, Thomas Rockwell, Peter Gold, Michael Oskin
The central portion of the Pacific-North American plate margin known as the Big Bend domain (BBD) contains kinematically and geometrically diverse arrays of faults that accommodate the transfer of shearing from the Gulf of California to more widely... more
16190
Poster
111
Geology Using Ground-based Magnetics and VLF Surveying to Characterize Potential Fault Zones Near Bonanza Springs, California
Peter Flores, Jascha Polet
Bonanza Springs is a rare natural watering spot and riparian environment in the eastern Mojave fed by a local aquifer. Like many desert oases in this area, faulting plays a large role in the local hydrology and flow of groundwater in the subsurface... more

Poster 139
SAFS Subsurface Geometry of the San Andreas Fault in Southern and Central California: A Summary
Gary Fuis
Seismic, potential-field, and earthquake data have been collected across the San Andreas fault (SAF) in a number of locations in southern and central California. In most locations the fault does not have a vertical or steep dip (>85 deg). In at... more

Poster
233
Ridgecrest Distinguishing slip from the M6.4 and M7.1 Ridgecrest earthquakes using campaign GPS data
Gareth Funning, Michael Floyd, Rachel Terry
The 2019 Ridgecrest earthquakes pose interesting questions about the nature of intersecting conjugate ruptures, and also the possibility of re-rupture of fault segments. Aftershocks of the July 4th M6.4 event suggest the possibility of a secondary... more
18201
Talk
Tue 1330
SDOT Multi-scale and multi-physics modeling of puzzling earthquake dynamics
Alice-Agnes Gabriel
Physics-based earthquake scenarios using modern numerical methods and hardware specific computational optimizations can shed light on the dynamics, and severity, of earthquake behavior. This is specifically useful in tectonic settings which are... more

Poster
168
FARM Deeply-sourced fluids upwelling along a fault can control seismogenesis
Dmitry Garagash
Near lithostatic pore fluid pressure and absolute weakness of major continental transform faults at depth have been suggested by observations of low (tidal) stress triggering of slow slip at the base of the San Andreas Fault (SAF) at Parkfield [... more

Poster
256
Ridgecrest A rapid seismic deployment to capture aftershock sequence of 2019 Mw 7.1 Ridgecrest earthquake
Abhijit Ghosh, Manuel Mendoza, Shankho Niyogi, Kuntal Chaudhuri, Baoning Wu, Andrew Birkey
A Mw 6.4 earthquake strikes near Ridgecrest on July 4th, 2019. Next day, a Mw 7.1 occurs within a few miles. A prolific aftershock sequence follows, which is still continuing. They have caused damage to infrastructure and structures in nearby cities... more

Poster
103
Geology Paleoseismic Results from a Trench across the Casa Loma Strand of the San Jacinto Fault Zone in San Jacinto, California
Robert Givler, Ross Hartleb, Chris Kemp, Mark Szymanski, Scott Lindvall, Brian Gray, Thomas Rockwell, Robert Bell
The San Jacinto fault zone is one of the most seismically active structures in southern California and has produced 10 historical M>6 earthquakes. The San Jacinto fault zone comprises several fault strands, including (from N to S) the Claremont,... more

Poster
075
Seismology A mechanism for induced earthquakes at large distances and depths from injection wells
Thomas Goebel, Kyung Chang, Emily Brodsky
Fluid-injection induced seismicity, at times, occurs at distances and depths of several kilometers from the targeted reservoir. Here, we explore the role of poroelastic stress changes in inducing such deep and distant events. We examine the distance... more

Poster
214
Geodesy GeodVel: it's the better geodetic Plate Tectonic model at the border between NorthAmerica and Pacific?
Jose Javier Gonzàlez-Garcìa, Alejandro Gonzalez-Ortega, Juan Carlos Robles-Avalos, Hebert Martinez-Barcena
We use the Euler vector parameters and Google Earth as visualization tool looking for the key geomorphology features along the Pacific-NorthAmerican plates border (Pa-Na) at Las California's and beyond, following the original Triple Junction (... more

Poster
079
Seismology Earthquake and Tectonic Tremor Dynamically Triggered by the 2017 Mw8.2 Mexico Earthquake
Hector Gonzalez-Huizar, Kevin Chao, Vladimir Kostoglodov
Right after a large magnitude earthquake occurs, some areas near its epicenter experience an increase in seismic activity. Furthermore, increases in seismicity have also been observed in places very distant from large earthquakes the moments after... more

Poster
195
SDOT Strain accumulation in the Southernmost Section of the San Andres fault system in northern Baja California, Mexico
Alejandro Gonzalez-Ortega, Arisai Velazquez-Zaguilan, Jose Javier Gonzàlez-Garcìa, David Sandwell
We have deployed and measured a very dense GPS array across the Cerro Prieto (CPF) and Imperial (IF) faults, in the southernmost section of the San Andreas Fault System in Mexicali Valley, Baja California, Mexico, to determine the extension of... more
18134
Poster
243
Ridgecrest Survey of Damaged Tufa Pinnacles in Trona Following the 2019 M7.1 Ridgecrest Earthquake
Christine Goulet, Xiaofeng Meng, Andrea Donnellan, Gregory Lyzenga
The determination of ground motion upper limits is a key knowledge gap for the design of critical infrastructure such as power plants or even dams. Precariously balanced rocks (PBRs) are a type of fragile geologic features (FGFs) that can be toppled... 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.