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 201-250 of 305

SCEC ID	Category	Title and Authors	SCEC Award
Poster 144	Geology	Using lidar to elucidate the slip behavior of the southern Alpine Fault, New Zealand Jozi Pearson, Nicolas Barth We use a newly acquired airborne lidar swath to interpret geomorphic features associated with the southernmost 25 km of the onshore Alpine Fault (AF) in New Zealand. In this heavily vegetated environment a ground return point cloud density up to 4... more
Poster 011	CISM	Performance enhancements and visualization for RSQSim earthquake simulator Dmitry Pekurovsky, Amit Chourasia, Keith Richards-Dinger, Bruce Shaw, James Dieterich, Yifeng Cui We report on progress of performance tuning and visualization for earthquake simulator code RSQSim. We have studied performance of the code in detail on supercomputers such as Blue Waters (NCSA/UIUC), Stampede (TACC) and Mira (Argonne). We have... more
Poster 023	SP	Detecting Micro-seismicity and Long-duration Tremor-like Events from the Oklahoma Wavefield Experiment Zhigang Peng, Chenyu Li, Zefeng Li, Chengyuan Zhang, Nori Nakata Oklahoma has experienced abrupt increase of induced seismicity in the last decade. An important way to fully understand seismic activities in Oklahoma is to obtain more complete earthquake catalogs and detect different types of seismic events. The... more
Poster 125	Geology	New high-resolution seismic data reveals the Holocene active structures and deformation events in offshore Ventura basin, CA Hector Perea, Gülsen Ucarkus, Neal Driscoll, Graham Kent, Yuval Levy, Thomas Rockwell During the last 2-5 Ma, the Transverse Ranges (Southern California) have been subject to a N-S compression related to the formation of a regional restraining bend in the San Andreas Fault and resulting in the development of an E-W trending thrust-... more	12026
Poster 178	FARM	Dynamic rupture modeling of thrust faults with parallel surface traces. Paul Peshette, Julian Lozos, Doug Yule Fold and thrust belts (such as those found in the Himalaya or California Transverse Ranges) consist of many neighboring thrust faults in a variety of geometries. Active thrusts within these belts individually contribute to regional seismic hazard,... more
Poster 140	Geology	Terrestrial cosmogenic surface exposure dating of moraines at Lake Tahoe in the Sierra Nevada, California, and slip rate estimate for the West Tahoe fault. Ian Pierce, Steven Wesnousky, Lewis Owen Two sets of Pleistocene moraines (Tioga and Tahoe) are preserved at Cascade Lake along the west side of Lake Tahoe. 10Be terrestrial cosmogenic nuclide surface exposure ages for two younger Tioga moraines yield an average age of 22.3 ± 1.2 ka,... more
Poster 209	SDOT	Using Borehole Breakouts in Deviated Offshore Wells to Constrain Stress Regimes Beneath The Santa Barbara Channel, Offshore Southern California Edward Pritchard, Patricia Persaud, Joann Stock The Santa Barbara Channel is an E-W trending marine basin that represents the western continuation of the onshore Ventura basin. Beneath this channel lie several active, E-W trending en echelon fault systems, with both N and S dips, that control a... more	16062, 15012, 14118
Poster 137	Geology	Effects of Improved Production Rates and Statistical Treatment of Cosmogenic Dates on California fault slip rates Veronica Prush, Michael Oskin Terrestrial cosmogenic nuclides (TCNs), such as Beryllium-10, are commonly used in fault slip-rate studies to determine the ages of offset surfaces. Two recent advances in the treatment of TCN ages necessitate reinterpretation of previously... more	15209
Poster 032	Seismology	Ground motion coherence study in multiple distance ranges and frequency bands Lei Qin, Yehuda Ben-Zion, Frank Vernon We analyze one year of continuous waveform data from the Pinon Flats Observatory Array (PY) and Dry Wash linear array (DW) across the San Jacinto fault. PY consists of 13 broadband sensors arranged on three circles with station separated by about... more
Poster 037	Seismology	Eikonal Tomography of the Southern California Plate Boundary Region Hongrui Qiu, Yehuda Ben-Zion, Fan-Chi Lin We use eikonal tomography to derive directionally-dependent phase and group velocities of surface waves sensitive to the approximate depth range 1-20 km for the plate boundary region in southern CA. Seismic noise data recorded by 346 stations in the... more
Poster 133	Geology	Tectonic control on landsliding in the nepal himalaya revealed by the 2015 gorkha earthquake Paul Quackenbush, Josh West, Marin Clark, Dimitrios Zekkos, Chamlagain Deepak The Mw 7.8 Gorkha earthquake in 2015 triggered more than 25,000 landslides, providing a rare opportunity to gain new general understanding of the links between faulting, tectonics, and landsliding. While landslides from many other seismic events are... more
Poster 248	GM	Sensitivity and Comparison of Two Broad-band Synthetic Generation Methods Leonardo Ramirez-Guzman, Miguel Jaimes, Carlos Mendoza The use of synthetic seismograms with engineering applications in mind is starting to gain acceptance worldwide, and validation efforts are a current topic of several research groups. Here we analyze the performance and sensitivity of two... more
Poster 141	Geology	Toward characterizing extension and Quaternary faulting on the Pleasant Valley fault, Central Nevada Tabor Reedy, Steven Wesnousky The Pleasant Valley fault is a 59 km long fault located approximately 30 km south of Winnemucca, Nevada. The fault system is the northernmost of a set of historical surface rupturing earthquakes that define the Central Nevada Seismic Belt (CNSB).... more
Poster 028	Seismology	Towards Structural Imaging Using Scattering Artifacts Detected in Ambient Field Correlations Lise Retailleau, Gregory Beroza Correlations of the ambient seismic field have been used successfully for tomographic imaging of the Earth on a wide range of scales. This is based on the theoretical and experimental observations that correlation functions computed between the... more
Poster 126	Geology	Evidence for Holocene coseismic subsidence during a non- plate boundary earthquake Laura Reynolds, Alexander Simms, Thomas Rockwell, Yusuke Yokoyama, Yosuke Miyairi, Alexandra Hangsterfer Coseismic subsidence is a coastal hazard commonly associated with subduction zones. Although discrete coseismic events have also been proposed for tectonic basins and synclines along non-plate boundary active margins, confidently differentiating the... more	14008, 15156, 16132
Poster 258	GM	Estimation of Ground Motion Variability in the CEUS Sanaz Rezaeian, Xiaodan Sun, Brandon Clayton, Stephen Hartzell The Next Generation Attenuation for Eastern U.S. (NGA-East) project (Goulet et al., 2017) has adopted the Sammon’s mapping approach for estimating ground motion uncertainties in the Central and Eastern United States (CEUS). Although this approach... more
Poster 010	EFP	Earthquake forecasts and their applications following the M7.8 2016 Kaikoura earthquake David Rhoades, Matthew Gerstenberger, Annemarie Christophersen, David Harte Following the M7.8 Kaikoura earthquake of 14 November 2016, GNS Science, through the GeoNet website, provided public forecasts of future earthquake occurrence, similar to the practice that has evolved during major earthquake sequences in New Zealand... more
Poster 309	CEO	2017 USEIT: SCEC-VDO Enhancement and Release Sebastian Rinkema, Alyssa Oda, Alejandro Narvaez-Colon, Kevin Rolón-Domena, Prad Tantiwuttipong, Esther Kala, John Yu, Kevin Milner, Gabriela Noriega, Jozi Pearson, Thomas Jordan SCEC-VDO (Southern California Earthquake Center Visual Display of Objects) is a visualization software that enables interactive, 4D display of diverse geo-referenced datasets for analysis, presentation, and publication. SCEC-VDO is developed by... more
Poster 255	GM	NGA high-pass filters remove important real signals; simple tilt correction is preferable when predicting collapse. Becky Roh, Kenny Buyco, Thomas Heaton Horizontal accelerometers record a combination of horizontal ground acceleration and gravitational changes from ground tilt. Traditionally, the tilt effect is removed in data processing to attempt to find the actual ground motion. NGA uses zero-... more
Poster 051	Seismology	Anomalously large complete stress drop during the 2016 Mw 5.2 Borrego Springs earthquake inferred by waveform modeling and near-source aftershock deficit Zachary Ross, Hiroo Kanamori, Egill Hauksson The 2016 Mw 5.2 Borrego Springs earthquake occurred in the trifurcation area of the San Jacinto fault zone and generated more than 23,000 aftershocks. We analyze source properties of this earthquake along with 12,487 precisely located aftershock... more
Poster 086	Geodesy	Off-fault deformations and shallow slip deficit from dynamic rupture simulations with fault zone plasticity Daniel Roten, Kim Olsen, Steven Day Fault slip distributions obtained from source inversions of major (M > 7) strike-slip earthquakes (e.g., M 7.3 Landers, M 7.1 Hector Mine, M 7.6 Izmit, M 6.5 Bam, M 7.2 Baja California) indicate that coseismic slip near the surface is... more	16238
Poster 001	EFP	Repeating Earthquakes Trigger Themselves in Parkfield Justin Rubinstein, William Ellsworth Previous studies of repeating earthquake sequences in Parkfield, Taiwan and Japan yield that repeating earthquakes behavior is better predicted by a characteristic earthquake model with fixed inter-event time or fixed slip than it is by the time-... more
Poster 084	Seismology	Path and site effects in GMPEs: Incorporating crustal physical properties for region-specific ground motion estimation using small magnitude data from Southern California Valerie Sahakian, Annemarie Baltay, Tom Hanks, Janine Buehler, Frank Vernon The purpose of this work is to reduce aleatory uncertainty in ground motion prediction equations (GMPEs) by including knowable, physical processes or properties of path effects; in effect, reclassifying this uncertainty as epistemic, and improving... more
Poster 252	GM	Synthetic ground motions of the 8 October 2005 Kashmir earthquake (Mw 7.6): a stochastic finite fault element approach Hamid Sana Synthetic ground motions of the 8 October 2005 Kashmir earthquake (Mw 7.6) were generated in the Kashmir basin, NW Himalaya. This earthquake caused paramount amount of damage to life and property. It resulted in death of 86,000 people and... more
Poster 089	Geodesy	A 4-D Earthquake Cycle Model with Lateral Variations in Shear Modulus David Sandwell, Bridget Smith-Konter We have developed a semi-analytic approach (and computational code) for rapidly calculating 3D time-dependent deformation and stress caused by screw dislocations imbedded within an elastic layer overlying a Maxwell viscoelastic half space. The... more	17042, 17169
Poster 261	GM	Improving static slip characterization of near-shore earthquakes with amphibious datasets: A Cascadia example Jessie Saunders, Jennifer Haase The rupture location of a Mw~8 megathrust earthquake can dramatically change the near-source tsunami impact, where a shallow earthquake can produce a disproportionally large tsunami for its magnitude. Because the locking pattern of the shallow... more
Poster 250	GM	Generating 10 Hz deterministic broadband ground motions using kinematic source descriptions William Savran, Kim Olsen, Steven Day Small buildings, such as single and multi-family residences, are most susceptible to seismic waves between 5 and 10 Hz. Therefore, it is crucial we understand the behavior of these high-frequency waves to provide informed seismic hazard assessments... more
Poster 182	FARM	Exploring seismological properties of asperity-type events in a rate-and-state fault model Natalie Schaal, Nadia Lapusta, Yen-Yu Lin Observations of foreshocks on both natural and laboratory faults suggest that the source of the foreshocks may be fault heterogeneities, such as bumps, that are driven to fail by aseismic processes of the mainshocks nucleation process [e.g., Dodge... more	17154
Poster 121	Geology	Slip rate variation of the Central Sierra Madre fault, southern California over the past 200 ka Katherine Scharer, Reed Burgette, Austin Hanson, Nathaniel Lifton, Tammy Rittenour, Devin McPhillips The Central Sierra Madre fault (CSMF) system uplifts the San Gabriel Mountains along the northern Los Angeles metropolitan area. A suite of late Quaternary alluvial fan surfaces are preserved near Arroyo Seco and offset across strands of the CSMF.... more	15179, 16066
Poster 044	Seismology	A systematic assessment of the spatio-temporal evolution of fault activation through induced seismicity in Oklahoma and southern Kansas Martin Schoenball, William Ellsworth Much of Oklahoma and Southern Kansas has seen widespread seismic activity in the last decade that is attributed to large-scale wastewater disposal into the Arbuckle group. Using a waveform-relocated earthquake catalog, we perform a systematic study... more
Poster 008	EFP	Nonparametric Hawkes models with strike angle covariates. Frederic Schoenberg, James Molyneux Earthquake focal mechanism estimates have been posited to have predictive value for forecasting future seismicity. In particular, for strike-slip earthquakes, aftershocks should occur roughly along the estimated mainshock strike. However, the errors... more
Poster 225	SDOT	Constraints on seismic anisotropy in ductile rock fabric and application to imaging fault roots in southern California Vera Schulte-Pelkum, Karl Mueller, Sarah Brownlee, Thorsten Becker, Kevin Mahan Understanding the roots of faults in the deep, ductile crust constrains and validates rheological models of deep shear and informs fault modeling of strain transfer across the base of the seismogenic crust. We show passive imaging results for deep... more	17098, 17097
Poster 099	Geodesy	The M7 2016 Kumamoto, Japan, Earthquake: 3D coseismic deformation from differential topography Chelsea Scott, Ramon Arrowsmith, Lia Lajoie, Ed Nissen, Tadashi Maruyama, Chiba Tatsuro The April 2016 Kumamoto earthquake sequence ruptured the Hinagu and Futagawa faults on the Kyushu Island of SW Japan. Our work concentrates on the M7 mainshock, which ruptured 30 km of fault length with an oblique strike-slip mechanism. We present... more
Poster 110	Geology	Timing of Earthquakes during the past 800 years along the Peninsula Section of the San Andreas Fault Suggests Persistent 1906-like Behavior Gordon Seitz, Maxime Mareschal, Nathan Barrett, David Olsen Evidence to support the existence of a peninsula San Andreas fault (SAF) segment, with an individual earthquake (EQ) history, has been a speculative hypothesis. The only historical EQ rupture that can be confidently located, is the M7.9 1906 San... more
Poster 069	Seismology	Repeating earthquakes detected by a new fast method reveal complex creep behavior in the northern San Francisco Bay Area Nader Shakibay Senobari, Gareth Funning Repeating earthquakes (REs) are families of seismic events generated by repeated loading and failure of a single fault asperity. They produce similar waveforms at common seismic stations, that can be identified by similarity search. Sequences of REs... more
Poster 157	SAFS	Seismic imaging of the southern California plate-boundary around the South-Central Transverse Ranges using double-difference tomography Pieter-Ewald Share, Yehuda Ben-Zion, Clifford Thurber, Haijiang Zhang, Hao Guo We derive P and S seismic velocities within and around the South-Central Transverse Ranges section of the San Andreas Fault (SAF), using a new double-difference tomography algorithm incorporating both event-pair and station-pair differential times.... more
Poster 014	WGCEP	Striking agreement of physics-based earthquake simulator and UCERF3 California seismic hazard model Bruce Shaw, Kevin Milner, Edward Field, Keith Richards-Dinger, Jacquelyn Gilchrist, James Dieterich, Thomas Jordan Probabilistic seismic hazard analysis (PSHA) provides important information to society, informing building codes and hazard mitigation efforts. The PSHA models currently applied in California combine fault-based earthquake rupture forecasts (ERFs)... more	17218
Poster 145	Geology	Garlock Fault: Re-assessing past stream offsets at Oak Creek Canyon and predicting future fault displacements Kelley Shaw, Graham Kent Numerous paleoseismic investigations have been undertaken along the western and central traces of the Garlock fault. Some of the older investigations relied on rough topographic data for cross fault reconstructions to estimate slip rates. Re-... more
Poster 054	Seismology	Testing and Reconciling Stress Drop and Attenuation Models for Southern California Peter Shearer, Rachel Abercrombie, Daniel Trugman Earthquake stress drop is a fundamental source parameter, implicit in many SCEC science goals. It is relatively easy to estimate from seismic data, but hard to measure reliably. The large uncertainties and scatter in results affect strong ground... more	16020
Poster 078	Seismology	A 15-year catalog of more than 1 million low-frequency earthquakes: tracking tremor and slip along the deep San Andreas Fault David Shelly Low-frequency earthquakes (LFEs) are small, rapidly recurring slip events that occur on the deep extensions of some major faults. Their collective activation is often observed as a semi-continuous signal known as tectonic (or non-volcanic) tremor... more
Poster 031	Seismology	On the Properties of Higher-Order Ambient Field Correlation Yixiao Sheng, Nori Nakata, Gregory Beroza Higher order cross-correlations, like C3 (correlation of the coda of correlation), of the ambient seismic field, is observed to yield more symmetric, and thus more accurate Green’s functions (GFs) than direct, first order correlation (C1). This is... more
Poster 230	CXM	Inferring Crustal Viscosity from Seismic Wavespeeds: Applications to the Rheologic Structure of Southern California William Shinevar, Mark Behn, Greg Hirth, Oliver Jagoutz We constrain the viscosity of the lower crust through a joint inversion of seismic P-wave (Vp) and S-wave (Vs) velocities. Previous research has demonstrated robust relationships between seismic velocity and crustal composition, as well as between... more	16106, 17202
Poster 301	CME	The SCEC Broadband Platform: Open-Source Software for Strong Ground Motion Simulation and Validation Fabio Silva, Philip Maechling, Christine Goulet, Thomas Jordan The Southern California Earthquake Center (SCEC) Broadband Platform (BBP) is a carefully integrated collection of open-source scientific software programs that can simulate broadband (0-100 Hz) ground motions for earthquakes at regional scales. The... more	16021, 16063, 16110, 16115, 16162
Poster 151	Geology	Late-Holocene Earthquakes on the Rose Canyon Fault at Old Town, San Diego CA Drake Singleton, Thomas Rockwell, Monte Murbach, Diane Murbach, Jillian Maloney, Yuval Levy, Eui-Jo Marquez, Luke Weidman We present the results of new paleoseismic trenches excavated across the main trace of the Rose Canyon fault (RCF) in Old Town, San Diego, to determine the timing of late Holocene earthquakes. The stratigraphy at the site consists of historical... more
Poster 042	Seismology	Microseismic events associated with the Oroville Dam spillway Rob Skoumal, Ezer Patlan, Phillip Dawson, J. Ole Kaven, Stephen Hickman On 14 February 2017, two small (equivalent Md 0.8 and 1.0) seismic events occurred in proximity to the Oroville Dam in the Sierra Nevada foothills, CA. To examine possible causal relationships between these events and reservoir operations, including... more
Poster 186	FARM	Earthquake cycles with dynamic weakening from flash melting with heterogeneous stress and near-fault anelastic strain Norman Sleep Major earthquakes may nucleate at high-shear-traction patches of strike-slip faults left over from heterogeneous slip in past events. Once an earthquake is underway, the slip-weakening distance can be less than 1 mm for rate and state friction and... more	17001
Poster 223	SDOT	Deformation of the southern San Andreas Fault System induced by lateral variations in crustal rigidity Bridget Smith-Konter, David Sandwell, Xiaopeng Tong, Xiaohua Xu, Lauren Ward, Justin Higa To improve our understanding of crustal rheology influences on fault loading processes, we have developed a 4-D earthquake cycle model of the San Andreas Fault System (SAFS) that incorporates spatial variations in lithosphere rheology. We have added... more	17169, 16177
Poster 039	Seismology	Stochastic Representations of Seismic Anisotropy: Verification of Effective Media Models for Locally Isotropic 3D Heterogeneity Xin Song, Thomas Jordan, David Okaya A self-consistent theory for the effective elastic parameters of stochastic media with small-scale 3D heterogeneities has been developed using a 2nd-order Born approximation to the scattered wavefield [Jordan,2015]. The theory has been applied to... more
Poster 026	Seismology	Geometry of the Los Angeles Basin Using Full H/V Spectral Ratio Inversion Zack Spica, Mathieu Perton, Robert Clayton, Gregory Beroza The H/V spectral ratio (HVSR) of the auto-correlated signal at a seismic station is proportional to the ratio of the imaginary parts of the Green's functions. Following this approach, observations of H/V can be compared to their theoretical... more	17031
Poster 306	CEO	Temblor, an app to transform seismic science into personal risk reduction Ross Stein, Volkan Sevilgen, David Jacobson, Alexandra Kim, Gabriel Lotto Government agencies and academic researchers and provide a rich stream of seismic and engineering data. In addition to rapid earthquake notifications and damage assessments, these form the basis of probabilistic seismic hazard assessments and loss... more

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