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.

Results 51-100 of 320

SCEC ID	Category	Title and Authors	SCEC Award
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
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
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
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
Poster 121	Geology	Ethical considerations for research on Fragile Geologic Features Lisa Grant Ludwig Fragile geologic features (FGF) are individually unique non-renewable natural resources. Some FGFs with aesthetic or cultural significance are preserved within parks (e.g. Arches National Park, US) for future generations. FGFs may also have... more	19187
Poster 252	Ridgecrest	3D ground motion simulations for small to moderate magnitude events in the Ridgecrest sequence Robert Graves The main goals of this work are to examine the adequacy of existing SCEC 3D Community Velocity Models (CVMs) in simulating near-fault, long period (T > 1 sec) ground motions for small-to-moderate magnitude events in the Ridgecrest area, and to... more
Poster 161	FARM	Inelastic off-fault deformation and pulverization in the lab: Tensile fragmentation of crystalline vs. granular sedimentary rocks in response to isotropic tension W. Griffith, Zachary Smith, Michael Braunagel, Thomas Marren, Sasha Larocque The presence of pulverized (highly fragmented, but weakly strained) zones extending 100-200 m from major strike slip faults, including the San Andreas Fault, have been attributed to impulsive compressive stresses associated with propagating... more
Poster 039	EFP	Tsunami Squares: Validation by Comparison to the Regional Ocean Modeling System Tsunami Simulator and Earthquake Driven Inundation Mapping David Grzan, John Rundle, John Wilson, Tony Song Due to the destructive nature of tsunamis, early warning systems are necessary to avoid loss of human life. This paper outlines the groundwork for such a system that will link Total Electron Content signatures of tsunamis detected by GNSS satellites... more
Poster 212	Geodesy	Variational Bayesian Independent Component Analysis for InSAR displacement time series with application to Central Valley, California Adriano Gualandi, Zhen Liu The exploitation of ever increasing Interferometric Synthetic Aperture Radar (InSAR) datasets to monitor the Earth surface deformation is an important goal of today’s geodesy. Surface geodetic deformation observations are often the result of the... more
Poster 197	SDOT	Detecting and Reducing the Effects of Postseismic Deformation in Observed GPS Time Series Using a Hybrid Forward/Inverse Method in Southern California Katherine Guns, Richard Bennett High precision geodetic measurements of plate boundary zone deformation have provided an invaluable opportunity to analyze all aspects of the earthquake cycle over the last three decades. Yet, we still struggle to piece apart long- and short-term... more	17161
Poster 298	CS	Applications of and considerations for using machine learning and deep learning tools in earthquake engineering, with focus on soft story building identification Abhineet Gupta, Todd MacDonald, Debbie Weiser Machine learning and deep learning technologies are being increasingly used in applied fields including earthquake engineering, with example applications including predicting damage levels from imagery or forecasting earthquakes from acoustic... more

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