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 305

SCEC ID	Category	Title and Authors	SCEC Award
Poster 278	CS	SEISM-IO: A High Level Parallel I/O Library for High-Performance Seismic Applications Yifeng Cui, Dawei Mu, Daniel Roten SEISM-IO is a high-level parallel I/O library developed with a goal to simplify the programming of parallel I/O for seismic applications at scale. This library has added the sub-library feature and has been optimized for performance and programming... more	ACI-1450451
Poster 135	Geology	Co- and post-seismic debris flows triggered by the 2015 Gorkha Earthquake Maxwell Dahlquist, Josh West, Julie Martinez Debris flows are a primary driver of erosion and a major geologic hazard in many steep landscapes, particularly near the headwaters of rivers, and are generated in large numbers by extreme events. The 2015 M w 7.8 Gorkha Earthquake triggered ~25,... more
Poster 244	GM	How Much Concentrated Earthquake Damage is due to Site Effects Versus Basin Edge Focusing? Paul Davis One of the goals of constructing earthquake hazard maps is to predict the shaking in advance of an earthquake, so that regions where damage will concentrate can be identified beforehand, and be given priority for minimizing hazard such as... more	15018
Poster 108	Geodesy	Towards an Understanding of the Geometry of the Hilton Creek Fault System Within the Long Valley Caldera, Using Ground-Based Magnetics and High-Resolution Topographic Profiles Jason De Cristofaro, Jascha Polet The eastern escarpment of California’s Sierra Nevada mountains is defined by a series of high-relief down-to-the-East normal faults including the Owens Valley, Round Valley, Hilton Creek and Hartley Springs faults. These faults separate the Sierra... more
Poster 269	GM	Seismic noise based ground motion: strong shaking predicted in Tokyo for the next M7+ earthquake on the Itoigawa-Shizuoka tectonic line. Marine Denolle, Pierre Boué, Gregory Beroza, Naoshi Hirata The Itoigawa-Shizuoka Tectonic Line (ISTL) is a major oblique left-lateral crustal fault able to host M7+ earthquake and that is at a mature stage of its cycle. Its proximity to the Kanto sedimentary basin poses a threat to metropolitan Tokyo. This... more	15036, 16246
Poster 093	Geodesy	USGS Global Positioning System (GPS) Network in Southern California Daniel Determan, Aris Aspiotes, Christian Guillemot, John Langbein, Mark Murray, Marcos Alvarez, Keith Stark The USGS Pasadena office operates 141 permanent, continuously-operating GPS monitoring stations as part of the Southern California GPS Network (SCGN). The SCGN network has grown and modernized over the years with the help of American Recovery and... more
Poster 102	Geodesy	Northwest Propagation of Postseismic Deformation in the Yuha Desert from the 2010 M7.2 El Mayor – Cucapah Earthquake Andrea Donnellan, Jay Parker, Robert Granat, Michael Heflin, John Rundle, Lisa Grant Ludwig, Marlon Pierce, Jun Wang The 2010 M7.2 El Mayor – Cucapah (EMC) ruptured from Baja California to the US Mexican border, triggering slip on a network of faults, primarily in the northeast lobe of coseismic deformation. Postseismic slip continued to occur on a network of... more
Poster 308	CEO	2017 UseIT: Communications Work Group Olivia Dorencz, Robert Hernandez, Amelia Midgley, Resherle Verna, Kevin Qualls, Kevin Rolón-Domena, Rafael Cervantes, Alyssa Oda, Jason Ballmann, Thomas Jordan, Jozi Pearson, Gabriela Noriega Representatives from each of the project teams in the 2017 Undergraduate Studies in Earthquake Information Technology (USEIT) internship cohort came together to create the Communications Work Group (CWG). The aim of CWG is to communicate earthquake... more
Poster 218	SDOT	Mechanical Models of Fault Slip Rates in the Imperial Valley, CA Jacob Dorsett, Scott Marshall, Elizabeth Madden, Michele Cooke The Imperial Valley, located in southern California and northern Mexico, is composed of a seismically active network of dominantly strike-slip faults, which together act to accommodate the majority of Pacific-North American plate motion. While many... more
Poster 118	Geology	Evidence of Na- and Mg-rich Hydrothermal Brines Driving Chloritization and Albitization in an Active Fault Zone: Case Study of the Borrego Fault, Baja CA, Mexico Matthew Dorsey, Thomas Rockwell, Gary Girty, Giles Ostermeijer, Thomas Mitchell, John Fletcher We collected a continuous sample of the fault core and 23 samples of the fault zone out to 52 m across the rupture trace of the 2010 M7.2 El Mayor-Cucapah earthquake to characterize the physical damage and chemical transformations associated with... more
Poster 046	Seismology	Large-N array observations of injection-induced seismicity in northern Oklahoma: the LASSO experiment Sara Dougherty, Elizabeth Cochran, Rebecca Harrington In response to the recent increase in seismicity rate in Oklahoma, we deployed a temporary array of more than 1,800 vertical-component nodal seismometers. The LArge-n Seismic Survey in Oklahoma (LASSO) array covered a 25-km-by-32-km region with a... more
Poster 169	FARM	Dynamic Models of Earthquake Rupture along branch faults of the Eastern San Gorgonio Pass Region in CA using Complex Fault Structure Roby Douilly, David Oglesby, Michele Cooke, Jennifer Beyer Compilation of geomorphic and paleoseismic data have illustrated that the right-lateral Coachella segment of the southern San Andreas Fault is past its average recurrence time period. On its western edge, this fault segment is split into two... more
Poster 179	FARM	Towards dynamic rupture models with high resolution fault zone physics Ahmed Elbanna, Xiao Ma, Setare Hajaroalsvadi Earthquake processes span a wide range of length and time scales with the fault zone dynamics holding the key to resolving many outstanding seismological observations. The details of strength evolution in fault zones are dictated by the poro-thermo-... more	15088, 16143
Poster 228	SDOT	Measurements of Tilt from Triangular Bench Mark Arrays Installed Within Long Valley Caldera in the 1980s Kaitlan Elizondo, Jascha Polet Ground tilt and broad deformation within Long Valley Caldera, east central California, has been consistently observed due to magmatic movement beneath the surface. In the early 1980’s, USGS scientists and Arthur G. Sylvester from UCSB, established a... more
Poster 199	FARM	A Test Case for the Source Inversion Validation: The 2014 ML 5.5 Orkney, South Africa Earthquake William Ellsworth, Margaret Boettcher, Hiroshi Ogasawara The ML5.5 earthquake of August 5, 2014 occurred on a near-vertical strike slip fault below abandoned and active gold mines near Orkney, South Africa. A dense network of surface and in-mine seismometers recorded the earthquake and its aftershock... more	17096
Poster 167	FARM	Earthquake Cycles With Complex Fault Geometries Brittany Erickson, Jeremy Kozdon The overall goal of this project is to develop an understanding of the earthquake cycle that takes into account the interaction of remote tectonic loading and near-fault structure. To do this we are developing a model that uses a quasi-static... more
Talk Tue 13:30	Geodesy	Strategies for building community-based geodetic models of fault slip rates Eileen Evans Developing a comprehensive model of tectonic continental deformation requires assessing 1) fault slip rates, 2) off-fault deformation rates, and 3) realistic uncertainties. Fault slip rates can be estimated by modeling fault systems based on space... more
Poster 196	FARM	Earthquake Petrology: Insights into Fault Slip Localization and Fault Heating via Micro X-Ray Fluorescence Mapping and X-Ray Absorption Near Edge Spectroscopy James Evans, Krishna Borhara, Samuel Webb Theoretical and laboratory analyses propose a range of dynamic weakening mechanisms to explain fault slip behavior, especially on extremely thin slip surfaces. We use a synchrotron light source to use microscale X-ray fluorescence (μXRF) analytical... more	15111
Poster 076	Seismology	Implementing rapid, probabilistic association of earthquakes with source faults in the CFM for southern California Walker Evans, Andreas Plesch, Won Lee, Natesh Pillai, John Shaw, Men-Andrin Meier, Egill Hauksson We present a statistical method to identify the fault (or sets of candidate faults) that generated an earthquake using information provided soon after these events occur. This effort bridges the information provided by increasingly sophisticated... more	17026
Poster 229	CXM	Objective Tectonic Regionalization of CVM-S4.26 Using the k-means Clustering Algorithm William Eymold, Thomas Jordan The SCEC Community Velocity Model CVM-S4.26 is a representation of the P and S velocities, α and β, as a function of geographic position x and depth z on a 500-m mesh over a 496 km x 768 km area of Southern California. The model was derived by full... more
Poster 150	Geology	Detecting small offshore earthquakes with Back-Projection Imaging and Match-filter Method Tian Feng, Lingsen Meng The detection of offshore seismicity in shallow portion of the subduction zones is ineffective due to the large distance from landward instruments. To better understand the offshore seismicity and slow slip around recent megathrust earthquakes, we... more
Poster 149	Geology	Exploring new seismic hazard scenarios in central Italy: hints about a previously unknown active normal fault highlighted by the Norcia 2016 (Mw 6.5) seismic sequence Federica Ferrarini, Giusy Lavecchia, Rita de Nardis, Ramon Arrowsmith, Francesco Brozzetti, Daniele Cirillo In 2016, one of the most energetic normal fault earthquake sequences, since the beginning of the last century, struck the central Italy. The seismic crisis started on August 24 with a Mw 6.0 event followed, in the months after, by several moderately... more
Poster 018	WGCEP	An Overview of the 3rd Uniform California Earthquake Rupture Forecast (UCERF3) Edward Field, Other WGCEP Participants Previous fault-based earthquake forecast models have generally assumed segmentation, excluded multi-fault ruptures, and ignored spatiotemporal clustering (aftershocks and otherwise triggered earthquakes), each of which has been brought into question... more
Poster 142	Geology	Do low-angle normal faults produce large earthquakes? A case study of the Cañada David Detachment of northern Baja California, Mexico John Fletcher, Jaziel Cambron, Thomas Rockwell, Keene Karlsson, Paula Figueiredo, Ronald Spelz, Pierre Lachan, Ivan Peña Villa, Alejandro Leon Loya, Alejandro Hinojosa, Sambit Prasanajit Naik , Lewis Owen The Cañada David detachment (CDD) controls the southern half of the Laguna Salada rift basin in northern Baja California and is a world-class example of an active low-angle normal fault (LANF). LANFs form one of the most poorly understood and... more
Poster 272	GM	A data-driven V_s,30 model for New Zealand engineering research & practice Kevin Foster, Brendon Bradley, Liam Wotherspoon, Christopher McGann We present a regional V_s,30 (time-averaged 30-meter depth shear wave velocity) map developed for New Zealand, closely following the methods employed in California by Thompson et al. (2014). V_s,30 is among the most widely used parameters for site... more
Poster 155	SAFS	A re-examination of the subsurface fault structure in the vicinity of the 1989 Loma Prieta Mw 6.9 earthquake, central California, from analysis of steep reflections, earthquakes, and potential-field data Gary Fuis, Edward Zhang, Rufus Catchings, Daniel Scheirer, Mark Goldman, Klaus Bauer We reinterpret the causative structure of the 1989 Mw 6.9 Loma Prieta earthquake, in central California, using reflection, earthquake, and potential-field data, prompted by recent interpretations of a two-part dip of the San Andreas fault (SAF)... more
Poster 098	Geodesy	A Systematic Study of Earthquake Detectability Using Sentinel-1 TOPS InSAR Gareth Funning, Astrid Garcia We report on our efforts to study global seismicity with Sentinel-1 TOPS data between April 2015 and December 2016. We searched the USGS/NEIC earthquake catalogue to identify earthquakes with epicenters located on land masses with deformation that... more
Talk Mon 13:30	CSEP	Earthquake Forecasting in recent large events in New Zealand and the role of CSEP Matthew Gerstenberger, David Rhoades, Annemarie Christophersen, Bill Fry, Laura Wallace, Graeme McVerry, Nick Horspool The November 14th, 2016, Mw 7.8 Kaikoura earthquake generated significant shaking and damage throughout a large part of central New Zealand. The recovery effort has been distributed over a very large area and the dissemination of information about... more
Poster 190	FARM	Laboratory geophysical observation of grain compression and crushing in synthetic fault gouges Amin Gheibi, Ahmadreza Hedayat Active geophysical monitoring techniques are among the most powerful techniques to identify changes in soil fabric, grain to grain contact network, compressional strength, and void ratio in granular materials. We present experimental results in... more	17242
Poster 079	Seismology	Natural Time and Earthquake Aftershock Entropy Alexis Giguere Driven threshold systems are characterized by cascading events or bursts that tend to be strongly clustered in linear (clock) time. As a result, a useful framework to analyze these events is the concept of event count, or “natural time”. For... more
Poster 013	CISM	Conditional Probabilities of Large Earthquake Sequences in California from the Physics-based Rupture Simulator RSQSim Jacquelyn Gilchrist, Thomas Jordan, Bruce Shaw, Kevin Milner, Keith Richards-Dinger, James Dieterich Within the SCEC Collaboratory for Interseismic Simulation and Modeling (CISM), we are developing physics-based forecasting models for earthquake ruptures in California. We employ the 3D boundary element code RSQSim (Rate-State Earthquake Simulator... more
Poster 106	Geodesy	Characterizing fault motion using edge detection in radar images Margaret Glasscoe, Jay Parker, Andrea Donnellan A moderate sized or secondary near-surface fault slip appears in a radar interferogram as a roughly linear feature with cross-section resembling either a step function or a Gaussian-filtered step, called a sigmoid. Building on past work that detects... more
Poster 226	SDOT	What allows seismic events to grow big?: Insights from b-value and fault roughness analysis in laboratory stick-slip experiments Thomas Goebel, Grzegorz Kwiatek, Thorsten Becker, Emily Brodsky, Georg Dresen Estimating the expected size of the largest earthquake on a given fault is complicated, for example, by dynamic rupture interactions in addition to geometric and stress heterogeneity. However, a statistical assessment of the potential of seismic... more
Poster 164	SAFS	Quaternary Slip History for the Agua Blanca Fault, northern Baja California, Mexico Peter Gold, Whitney Behr, Thomas Rockwell, John Fletcher The Agua Blanca Fault (ABF) is the primary structure accommodating San Andreas-related right-lateral slip across the Peninsular Ranges of northern Baja California. Activity on this fault influences offshore faults that parallel the Pacific coast... more	14719, 17197
Poster 215	SDOT	Interactions Between Strike-slip Earthquakes and the Subduction Interface near the Mendocino Triple Junction Jianhua Gong, Jeff McGuire The interactions between the North American, Pacific, and Gorda plates at the Mendocino Triple Junction (MTJ) create one of the most seismically active regions in North America. The earthquakes rupture all three plate boundaries but also include... more
Poster 143	Geology	GPR imagery and identification of neotectonic features of the Chupamiertos Fault System, Baja California, Mexico Allen Gontz, Thomas Rockwell, Keene Karlsson, John Fletcher, Jaziel Cambron Recently active faults create easily identifiable geomorphic and stratigraphic signatures in unconsolidated sediments. Identification of, and mapping of these features in trenches has been the norm for measuring offset and relating activity of... more	16190
Poster 092	Geodesy	Red Geodesica del Noroeste de Mexico (REGNOM) in northern Baja California. Alejandro Gonzalez-Ortega, Antonio Vidal-Villegas, Elvia Ramon Morales, Armando Valdez, Sergio Arregui Ojeda Permanent continuous GPS stations in Baja California started to operate since 1995 as part of the Southern California Integrated GPS Network (SCIGN). Due to the occurrence of the El Mayor-Cucapah earthquake Mw 7.2 in April 4, 2010, colleagues from... more
Poster 152	Geology	Using GeoGateway Line-of-Sight (LOS) Tool to Explore Deformation along the San Andreas Fault in the Carrizo Plain, CA Lisa Grant Ludwig, Andrea Donnellan, Jay Parker Crustal deformation is spatially and temporally non-uniform as strain accumulates over long time scales, is rapidly released in earthquakes, and readjusts post-seismically. Because earthquake processes occur over widely varying temporal and spatial... more
Poster 247	GM	Ground-Motion Simulations on Rough Faults in Complex 3D Media Robert Graves Observations from past earthquakes show that the rupture process can exhibit significant spatial variations in rupture speed, slip and slip rate, as well as geometric complexity of the faulting surface. Incorporating these features within kinematic... more
Poster 049	Seismology	Bayesian source mechanism inversion of induced seismicity in oil/gas fields and pico-seismicity (acoustic emission) in the laboratory Chen Gu, German Prieto, Ulrich Mok, Youssef Marzouk, Brian Evans, Nafi Toksöz We studied the source mechanisms of earthquakes occurred in multi-scales, from induced seismicity in oil/gas fields to pico-seismicity in the laboratory. A Bayesian source mechanism inversion method was demonstrated using data from field to... more
Poster 120	Geology	Investigating strain transfer along the Southern San Andreas Fault: A geomorphic and geodetic study of block rotation in the Eastern Transverse Ranges, Joshua Tree National Park, CA Katherine Guns, Richard Bennett, Kimberly Blisniuk To better evaluate the distribution and transfer of strain and slip along the Southern San Andreas Fault (SSAF) zone in the northern Coachella valley in southern California, we integrate geological and geodetic observations to test whether strain is... more	17161
Poster 307	CEO	Newspaper Media Content Analysis: Community Effects of Induced Seismicity in Oklahoma Georgia Halkia, Lisa Grant Ludwig Since 2010, seismicity in Oklahoma has increased dramatically. In 2014, Oklahoma experienced more earthquakes of M3 or greater than California, a state known as Earthquake Country. In 2015 there were >907 earthquakes M>3, providing motivation... more
Poster 202	FARM	Time Reversal Imaging of the 2014 Iquique Tsunami Source Jiayuan Han, Lingsen Meng The 2014 Mw 8.2 Iquique earthquake occurred off the coast of northern Chile, generating a tsunami with a maximum runup height of 1.75 meters. The slip distributions are highly variable depending on the choice of the dataset and inversion methods.... more
Poster 050	Seismology	Are the Stress Drops of Small Earthquakes Good Predictors of the Stress Drops of Larger Earthquakes? Jeanne Hardebeck Uncertainty in PSHA could be reduced through better estimates of stress drop for possible future large earthquakes. Studies of small earthquakes find spatial variability in stress drop; if large earthquakes have similar spatial patterns, their... more
Poster 203	FARM	Large Earthquakes and Creeping Faults Ruth Harris Most shallow continental crustal faults remain predominantly locked during the long periods of time between large earthquakes, however some slowly slip, or creep. The related microseismicity helps reveal faults that might not otherwise be observed... more
Poster 058	Seismology	Analysis of Two Magnitude ~4 Earthquakes and Aftershocks Near Truckee, California, 2017 Rachel Hatch, Ken Smith, Rachel Abercrombie On June 27th, 2017, two magnitude ~4 high-angle strike-slip faulting earthquakes occurred seven minutes apart approximately 20 km north of Truckee, CA. Both events were felt over a wide area in northeastern California and northwestern Nevada. The... more
Poster 217	SDOT	A model for the initiation, evolution and continued activity of the Garlock fault, California Alexandra Hatem, James Dolan The Garlock fault remains an enigmatic feature of southern California due to its arcuate geometry, variable slip rate along its length, and tectonic role as an ~east-west trending sinistral fault within the Pacific-North American plate boundary zone... more
Poster 231	CXM	Can the Depth Distribution of Seismicity be Applied to Probe the Rheology of the Seismogenic Crust in Southern California? Egill Hauksson, Men-Andrin Meier, Zachary Ross We carry out joint analysis of waveform relocated seismicity (1981-2016), geophysical, and geological datasets to probe the rheology of the crust in southern California. First, we calculate earthquake depth histograms (EDH) to quantify the depth... more	Y86581
Talk Tue 11:05	SAFS	Applying Paleo-earthquake Data to Query for Earthquake Gate Areas Egill Hauksson, Men-Andrin Meier Over geological time, plate motion and associated tectonic processes have created the geophysical conditions under which the San Andreas Fault (SAF) operates. These conditions influence earthquake processes on both short and long time scales... more	Y86581
Poster 082	Seismology	The seismological aftermath of the 2016 Mw7.8 Pedernales, Ecuador earthquake Stephen Hernandez On 16 April 2016, a strong underthrusting earthquake ruptured a ~100 by ~50 km segment of the Nazca-South American margin off the coast of the province of Manabí, Ecuador. Effects of the earthquake included >660 fatalities, a small tsunami,... more

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