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 151-200 of 323

SCEC ID	Category	Title and Authors	SCEC Award
Poster 316	CEO	Combining 3D printing and virtual reality goggles in outreach and communication events Christodoulos Kyriakopoulos, David Oglesby Earthquake scientists face a significant challenge in explaining their work to non-experts and the general public. For most non-experts the physical processes behind the generation of earthquakes remain something mysterious and difficult to... more
Poster 001	GM	Long Shaking Durations within the Los Angeles Basin from Shallow Earthquakes Voon Hui Lai, Zhongwen Zhan, Robert Graves, Donald Helmberger Shaking duration is a critical factor in assessing seismic hazards and building collapse risk, potentially as important as peak ground motion in large earthquake scenarios. The depths of earthquakes are often overlooked in ground motion studies, yet... more	18128
Poster 194	FARM	Earthquake Sequences in Rate-and-State Fault Models with Thermal Pressurization Valere Lambert, Stephen Perry, Nadia Lapusta Theoretical studies and laboratory experiments indicate that dynamic weakening, such as thermal pressurization of pore fluids, likely acts during earthquakes on mature natural faults. At first glance, this seems incompatible with the fact that... more	18085, 17154
Poster 272	SAFS	Gravity and aeromagnetic maps of the San Gorgonio Pass region, California: Potential insights from potential-field data on fault and basin geometry in a restraining bend Victoria Langenheim, Jonathan Matti Gravity and aeromagnetic maps superposed on detailed geologic mapping in San Gorgonio Pass (SGP) reveal details of fault and basin geometry where the southern San Andreas fault (SAF) breaks up into multiple strands as it curves into a restraining... more
Talk Tue 11:00	FARM	On the present and future of physics-based earthquake source modeling Nadia Lapusta Accelerating streams of field observations, lab studies, and numerical modeling have significantly improved our understanding of earthquakes and physical factors that affect them. The main suspects have been known for a while. Tectonic loading,... more
Poster 186	FARM	Numerical Modeling of a Fluid-Induced Aseismic-Seismic Slip Sequence on a Rate-and-State Fault Stacy Larochelle, Nadia Lapusta, Jean-Paul Ampuero, Frederic Cappa Numerous activities in the geo-energy industry (e.g., hydraulic fracking, wastewater disposal, CO2 sequestration and enhanced geothermal systems) involve fluid injections into the shallow crust (~1 to 5 km depth). That these fluid injections can... more	18174
Poster 235	Geology	Complex faulting structures in Eureka Valley, Death Valley National Park, CA Michael Lawson, Steven Okubo, Tyanna Schlom, Ed Rhodes, Jeff Knott, An Yin Eureka valley is a large basin in the northwest corner of Death Valley National Park. In 1993, a moment magnitude 6.1 earthquake occurred within the valley but due to its remoteness limited mapping has occurred in the area. As part of my... more
Poster 016	GM	Toward Hybrid Broadband Ground Motion Simulation Validation for Mw>3.5 New Zealand Earthquakes Robin Lee, Brendon Bradley, Xavier Bellagamba Recent advances in computational performance and physics-based ground motion simulation methodologies are making physics-based seismic hazard analysis a reality. Extensive validation of physics-based ground motion simulations against observations... more
Poster 151	CXM	Offshore Geology Framework for the Community Rheology Model Mark Legg, Michael Oskin The California Continental Borderland comprises the 250-km wide offshore part of the Pacific-North America transform plate boundary in southern California. The Offshore Geologic Framework (GF) for the SCEC Community Rheology Model (CRM) is based on... more	17146, 18195
Poster 252	Geology	Structural Architecture of the Western Transverse Ranges and Potential for Large Earthquakes - New Results of Trishear Forward Models Yuval Levy, Thomas Rockwell, John Shaw, Andreas Plesch, Neal Driscoll, Hector Perea Fold-and-thrust belts usually evolve over time, can produce large-scale faults and potentially accommodate large magnitude earthquakes. The thrust fronts of these structures typically form large fold structures in their hanging walls, and they tend... more	17024
Poster 070	Seismology	Delayed Triggering of small Local Earthquakes near the San Jacinto Fault after the 2014 Mw 7.2 Papanoa Earthquake Bo Li, Abhijit Ghosh We find evidence of delayed triggering of small earthquakes off San Jacinto Fault (SJF) near the Anza Gap. We develop a move max matched-filter method to analyze seismicity that occurred near the SJF one month before and after the 2014 Mw 7.2... more
Poster 284	Seismology	Fault Continuity and Rupture Branching of the 2014 Mw 6.0 South Napa Earthquake Viewed by Fault-Zone Trapped Waves Yong-Gang Li We present fault-zone trapped waves (FZTWs) generated by aftershocks and explosions detonated within the rupture zones of the 2014 Mw 6.0 South Napa earthquake, and use them to characterize the fault continuity and rupture branch structure along the... more	15195
Poster 121	Geodesy	Present day interseismic slip rates of the Xianshuihe Fault observed by InSAR Yuexin Li, Roland Bürgmann Located at the southeastern boundary of the Tibetan Plateau, the Xianshuihe Fault is one of the most active major faults in China. It serves as one of the main structures accommodating the collision between the Indian and Eurasia plates.... more
Poster 055	Seismology	Checking Data Quality of Co-located Broadband and Strong-motion Sensors in Southern California Seismic Network Zefeng Li, Egill Hauksson, Thomas Heaton, Luis Rivera, Jennifer Andrews Differences in waveforms recorded by broadband and strong motion sensors at the same site can be caused by sensor failure, mis-orientation in deployment, wrong instrument response parameters etc. Deployed instruments can malfunction and produce... more
Poster 205	FARM	A Dynamic Earthquake Simulator for Geometrically Complex Faults Governed by Rate- and State- Friction Dunyu Liu, Benchun Duan, Bin Luo We develop a dynamic earthquake simulator based on finite element methods (FEM) to model dynamics of geometrically complex faults governed by the rate- and state- friction (RSF) over multiple earthquake cycles. The simulator combines a dynamic FEM... more	18220
Poster 217	Geology	A 6000-Year-Long Paleoseismologic Record of Earthquakes along the Xorkoli Section of the Altyn Tagh Fault, China Jing Liu, Zhaode Yuan, Wei Wang, Ray Weldon, Michael Oskin, Yanxiu Shao Long records of paleoearthquakes are essential for understanding earthquake recurrence behavior of active faults and for evaluating regional seismic hazard. However, paleoseismic data on the Altyn Tagh fault (ATF), one of the longest strike-slip... more
Poster 108	Seismology	Finite Frequency Sensitivity Kernel for the Correlation of Ambient Noise Correlations: Theory and Numerical Tests Xin Liu, Gregory Beroza Full waveform adjoint tomography has achieved great success in applications from global structure using earthquakes to exploration seismology using active sources. When combined with ambient seismic noise interferometry, however, the shape of the... more
Poster 051	EFP	The earthquake rates they are a-changin’: Improving forecasts during earthquake swarms Andrea Llenos, Andrew Michael, Morgan Page, Nicholas van der Elst, Sara McBride Earthquake swarms present challenges for operational earthquake forecasting (OEF), because they are often modeled as time-varying changes in background seismicity that are driven by external processes such as fluid flow or aseismic creep, in... more
Poster 052	EFP	Building Earthquake Early Warning Networks With Low Cost, Off-the-Shelf Components Ryan Logsdon, Robert Walker, Sean Gibbons We seek to demonstrate the ability to use minimal cost, off-the-shelf components to create disparate networks for earthquake detection. These networks seek to draw a balance between fully crowd-sourced data gathering, such as that generated through... more
Poster 141	Geodesy	Soil moisture effects on InSAR time series in arid regions Rowena Lohman, Teresa Jordan, Junle Jiang We examine the effects of soil moisture variations on InSAR time series analysis in arid and hyperarid regions, including the impact on phase and amplitude. We demonstrate that amplitude variations alone do not correlate well with precipitation... more
Poster 207	FARM	The Effect of Along-Strike Variation in Dip on Rupture Propagation on Strike-Slip Faults Julian Lozos Strike-slip faults are nonplanar structures. Most large strike-slip faults have mapped complexities and discontinuities along strike, but seismological and geodetic inversions, as well as field geophysical studies, suggest dip can also vary... more
Poster 034	EFP	Nowcasting Induced Seismicity at the Groningen gas field in the Netherlands Molly Luginbuhl, John Rundle, Donald Turcotte The Groningen gas field in the Netherlands is one of the most productive gas fields in Europe. Production began in 1963 and in 1991 the area experienced their first induced earthquake. Since then there has been a significant level of induced... more
Poster 143	CXM	Estimates of Shallow Crustal Stress Heterogeneity Length Scale from Borehole Breakouts and Local Earthquake Focal Mechanism Inversions in the Los Angeles Basin Karen Luttrell, Jeanne Hardebeck Many contributions to the SCEC Community Stress Model rely heavily on the observations of stress field orientation provided by earthquake focal mechanisms and borehole breakouts to constrain their estimates. However, earthquake focal mechanisms and... more	18148
Poster 277	SAFS	A Moving Mud Pot Threatening Railroad Tracks and a Highway, Imperial County, California David Lynch, Travis Deane, Carolina Zamora, Dean Francuch, James Bailey, Christopher Allen, Justin Rogers, Cassandra Gouger INTRODUCTION The Salton Trough is a sag in stepover regions between the San Andreas, Imperial and Cerro Prieto Faults in southern California and northern Baja, Mexico. Due to a high geothermal gradient in the Colorado River sediments, the trough... more
Poster 280	FARM	Inelastic Wedge Failure and Along-Strike Variations of Tsunami Generation in the Shallow Subduction Zone Shuo Ma, Shiying Nie One remaining and important puzzle about the 2011 Tohoku tsunami is that the largest tsunami heights were observed along the Sanriku coast (between 39.5 and 40.25°N), ~100 km north of where the largest slip (>50 m) occurred in the trench, with... more
Poster 200	FARM	Modeling Dynamic Ruptures with High Resolution Fault Zone Physics Xiao Ma, Ahmed Elbanna Earthquakes are among the costliest natural hazards on earth. The dynamical instabilities responsible for the onset and propagation of these events are linked to fundamental physics- friction, fracture, heating, and compaction- of fluid filled... more
Poster 296	CME	The SCEC Software Ecosystem for Earthquake System Science Research Philip Maechling, Jacobo Bielak, Scott Callaghan, Yifeng Cui, Edward Field, Christine Goulet, Robert Graves, Thomas Jordan, Kevin Milner, Kim Olsen, Daniel Roten, William Savran, Fabio Silva, Mei-Hui Su, Ricardo Taborda, John Vidale The Southern California Earthquake Center Community Modeling Environment (SCEC/CME) collaboration has developed a collection of independent, but inter-related, scientific software systems designed to support earthquake system science research. We... more
Poster 130	Geodesy	Can we hide an active fault within a geodetic network? Yes, we can. Maria Beatrice Magnani Comparison of deformation rates around the New Madrid seismic zone (NMSZ), central U.S., indicates an apparent inconsistency between geologic and geodetic rates. In intraplate regions such as the central U.S., geologic rates, inherently longer-term... more
Poster 068	Seismology	Two Moho-Depth Earthquake Swarms along the Sierra Microplate Basin and Range Boundary Region Emily Maher, Ken Smith, Rachel Hatch, Kent Graham, Neal Driscoll, Noah Conway Two unprecedented near Moho-depth earthquake sequences, 2003-04 and 2011-12, occurred along the eastern Sierra Microplate northern Walker Lane boundary at ~30 km depth separated by ~50 km. Whereas typical seismogenic depths in this tectonic setting... more
Poster 243	Geology	Active Tectonics across the Indo-Burma Range Patcharaporn Maneerat The potentially active tectonics of the oblique subduction zone across the Indo-Burman Range (IBR), which formed due to India-Eurasia continent-continent collision in the Paleogene (Mitchell, 1993), remains controversial. To address the poorly... more
Poster 166	SDOT	Fault linkage through the Imperial Valley, California is required to match current slip rate estimates Scott Marshall, Elizabeth Madden, Jacob Dorsett, Michele Cooke The Imperial Valley hosts a seismically active network of strike-slip faults that comprise the southern San Andreas and San Jacinto fault systems and together accommodate the majority of relative Pacific-North American plate motion in southern... more
Poster 067	Seismology	Crustal seismogenic layer at active faults inferred by background seismicity and temperature data in Japan Makoto Matsubara, Tomoko Yano The lower limit of seismogenic layer within the crust relates to the maximum size of earthquakes caused by the active fault. We used the index “D95”, the depth above which 95 % of the whole crustal earthquakes occurred from the surface, to define... more
Poster 247	Geology	Late Quaternary Deformation in the Inverted Santa Maria Basin, CA: Documenting and Quantifying Active Folding from Syn-Tectonic Deposits Ian McGregor, Nate Onderdonk The Santa Maria area is an inverted basin in southern California with several kilometers of shortening deforming and uplifting deep-water basin rocks. Abundant subsurface data from active oil fields document total shortening and near-surface... more
Poster 255	Geology	Quantifying uncertainty in cumulative surface slip along the Cucamonga Fault, a crustal thrust fault in southern California Devin McPhillips, Katherine Scharer Studies of historic earthquake surface ruptures show that displacements along strike are spatially variable. As a result, latest Quaternary slip rates developed from a spatially restricted set of cumulative displacement measurements may not... more
Poster 064	Seismology	Reliable Real-Time Signal/Noise Discrimination with Deep and Shallow Machine Learning Classifiers Men-Andrin Meier, Zachary Ross, Anshul Ramachandran, Ashwin Balakrishna, Peter Kundzicz, Suraj Nair, Zefeng Li, Egill Hauksson, Thomas Heaton In Earthquake Early Warning (EEW), every sufficiently impulsive signal is potentially the first evidence for an unfolding large earthquake. More often than not, however, impulsive signals are mere nuisance signals, e.g. from a nearby airport or from... more
Poster 242	Geology	Coral microatolls as a tool for subduction zone paleoseismology: Identifying rare events along the Sunda megathrust and the Manila trench Aron Meltzner Over the course of a seismic cycle, the land and seafloor above a subduction zone rise and fall. These land-level changes are recorded by coral microatolls, coral colonies living near the base of the intertidal zone whose upper level of growth is... more
Poster 092	Seismology	Capturing Frictional Asperities along the Complex Structure of the Main Himalayan Thrust in Nepal after the 2015 Mw 7.8 Gorkha Earthquake Manuel Mendoza, Bo Li, Abhijit Ghosh, Marianne Karplus, John Nabelek, Soma Sapkota, Lok Adhikari, Simon Klemperer, Aaron Velasco The 2015 Mw 7.8 Gorkha earthquake produced 4 m of peak co-seismic slip as the Main Himalaya Thrust (MHT) ruptured eastward under the dense population centers, such as Kathmandu. The aftermath of destruction left over 9,000 people killed, and more... more
Poster 127	Geodesy	Pre-seismic and co-seismic deformation of the 2017 Mw 6.5 Jiuzhaigou, eastern Tibet earthquake constrained by GPS and InSAR data Guojie Meng, Xiaoning Su, Shunying Hong, Xin Zhou, Yanfang Dong, Chengtao Li We investigate pre-seismic and co-seismic crustal deformation of the 2017 Mw 6.5 Jiuzhaigou, which occurred in the eastern boundary of Bayan Har block, Tibet Plateau, using geodetic data. Pre-seismic deformation is in the epicentral area is realized... more
Poster 072	Seismology	Towards Quasi-Automated Estimates of Source Properties of Small to Moderate Southern California Earthquakes with Second Seismic Moments Haoran Meng, Jeff McGuire, Yehuda Ben-Zion We develop a method for quasi-automated estimation of directivity, rupture area, duration, and centroid velocity of earthquakes with second seismic moments. The method is applied to small to moderate earthquakes in southern California. The P and S... more	18062
Poster 279	FARM	Tsunami Source Inversions Using Adjoint-state Methods Lingsen Meng, Tong Zhou, Xie Yuqing, Jiayuan Han Traditional source inversion using tsunamis waves is based on either the finite-fault slip modeling or the time-reversal imaging. Such inversion methods suffer from the uncertainty of fault parameters or crustal rigidity. Moreover, the heavy... more
Poster 024	GM	Preliminary Results on Fully Nonergodic Ground Motion Models in Central California Using NGA-West2 and SCEC CyberShake Datasets Xiaofeng Meng, Christine Goulet, Kevin Milner, Scott Callaghan A key input to probabilistic seismic hazard analyses (PSHA) is the total standard deviation of the misfits between ground motion observations and the median ground motion models (GMMs, a.k.a GMPEs), commonly known as σtot. The most promising way to... more
Poster 228	Geology	High Resolution Geodetic Measurements of Co-seismic Fault-zone Deformation for Probabilistic Fault Displacement Hazard Assesment and Confidence Intervals on Geologic Slip Rates Chris Milliner, Andrea Donnellan Understanding how co-seismic shear strain changes with distance from the primary fault rupture, has importance for characterizing the hazard it poses to critical infrastructure and reliably estimating geologic slip rates from offset geomorphic... more
Poster 032	CISM	Fully physics-based PSHA: coupling RSQSim with deterministic ground motion simulations Kevin Milner, Bruce Shaw, Thomas Jordan, Scott Callaghan, Christine Goulet Probabilistic seismic hazard analysis (PSHA) is typically performed by combining an earthquake rupture forecast (ERF) with a set of empirical ground motion prediction equations (GMPEs). ERFs have typically relied on observed fault slip rates,... more	18142
Poster 172	FARM	Fluid-enhanced grain boundary sliding in pseudotachylyte survivor clasts: does creep cavitation lead to earthquake rupture? Elena Miranda, Alberto Perez-Huerta Viscous shearing in the middle and lower crust is observed to localize within pseudotachylyte veins hosted in coeval mylonite, but it is unclear what role hydrous fluids play in enhancing strain localization in pseudotachylyte. We investigate coeval... more	17063
Poster 258	SAFS	Using GeoGateway Data to Explore Deformation in the Cajon Pass Region Megan Mirkhanian, Lisa Grant Ludwig, Andrea Donnellan, Jay Parker, Robert Granat GeoGateway (http://geo-gateway.org) is a web map-based science gateway supported by NASA’s ACCESS program. A goal of GeoGateway is to expand the utility of NASA’s geodetic imaging data products by making them easy to access, analyze, and interpret.... more
Poster 150	CXM	RHEOL_GUI: A Matlab-based graphical user interface for the interactive investigation of strength profiles Laurent Montesi, William Leete As a contribution to the Community Rheology Model we developed an intuitive tool for the exploration and study of strength profile. Built as a Matlab Graphical User Interface, this tool, called RHEOL_GUI, allows the user to define a stratigraphic... more	17170
Poster 149	CXM	Modal mineralogy of the continental crust and implications for fault-zone rheology: Data mining the Southern Sierra Nevada exhumed crustal section Alex Morelan, Michael Oskin We examine the exhumed section from the southern Sierra Nevada to constrain modal mineralogy of batholithic crust as a function of depth, from 6 km to 35 km, for inclusion into the Community Rheology Model. We combine mineralogy data collected by... more	18041
Poster 088	Seismology	Rupture Model of the 2016 M5.8 Pawnee Induced Earthquake Morgan Moschetti, Stephen Hartzell, Robert Herrmann The 2016 M5.8 earthquake near Pawnee, Oklahoma is the largest induced earthquake in Oklahoma and is the largest wastewater-injection-induced earthquake the in the U.S. We invert regional and teleseismic waveforms to produce a rupture model of the... more
Poster 105	Seismology	Geometric and Level Set Tomography for Interface Detection in the Near Surface Jack Muir, Victor Tsai Seismic travel time tomography is a key component of geophysicists' basic toolbox for the characterization of the near surface. Traditional seismic travel time tomography seeks to optimize a field of velocity parameters to fit observed data;... more
Poster 136	Geodesy	Recent spatiotemporal evolution of deformation in the Los Angeles Basin and southern Central Valley of California in the context of anthropogenic activity Kyle Murray, Rowena Lohman Southern California experiences ongoing crustal deformation associated with tectonic processes such as interseismic fault creep. However, anthropogenic activities, including subsurface fluid extraction, can result in widespread and even larger... more

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