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 1-50 of 305

SCEC ID ▲	Category	Title and Authors	SCEC Award
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 002	EFP	Natural Time and Nowcasting Induced Seismicity at the Groningen Gas Field in the Netherlands Molly Luginbuhl, Donald Turcotte, John Rundle The area surrounding the Groningen natural gas field in the Netherlands has recently seen a significant increase in seismicity. How to handle this induced seismicity has become a controversial topic for many. The gas field provides energy for the... more
Poster 003	EFP	Towards Testing Probabilistic Seismic Hazard Estimates Mostafa Mousavi, Gregory Beroza Hazard curves in PSHA models are used for quantifying the seismic hazards by providing the annual rates of exceedance, the reciprocal of the return period, at various ground-motion levels. Beginning in 2016, the U.S. Geological Survey (USGS) started... more
Poster 004	EFP	Space-time earthquake rate models for one-year hazard forecasts in Oklahoma Andrea Llenos, Andrew Michael The recent one-year seismic hazard assessments for natural and induced seismicity in the central and eastern US (CEUS) (Petersen et al., 2016, 2017) rely on earthquake rate models based on declustered catalogs (i.e., catalogs with foreshocks and... more
Poster 005	EFP	Annual Earthquake Potential Consultation: A Real Forward Prediction Test in China Yongxian Zhang, Zhongliang Wu, Xiaotao Zhang, Gang Li We briefly reviewed the annual consultation on the likelihood of earthquakes in continental China since 1970s. The frames of the Summary Research Report on the National Key Earthquake Potential Areas in 2013 and 2014 were taken as two case studies.... more
Poster 006	EFP	On secular spatial seismicity Yosihiko Ogata It has been passed 15 years since the hierarchical (i.e., location-dependent) space-time ETAS (HIST-ETAS) models have been proposed (Ogata et al., 2003); and the short-term (daily) and intermediate-term (3-months and one year) earthquake forecasts... more
Poster 007	EFP	Model-free aftershock forecasts constructed from similar sequences in the past Nicholas van der Elst, Morgan Page The basic premise behind aftershock forecasting is that sequences in the future will be similar to those in the past. Forecast models typically use empirically tuned parametric distributions to approximate past sequences, and project those... 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 009	CSEP	Clustering features of seismicity in Italy during 2005 to 2016 Jiancang Zhuang, Yicun Guo, Maura Murru, Giuseppe Falcone, Elisa Tinti Compiled by Istituto Nazional Geofisca e Vulcanologia, Italy, the ISIDE catalog includes high quality records of the occurrence times, locations, magnitude and other information of earthquakes that occurred in the Italy region since 2005-4-16. To... 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 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 012	EFP	Are Physics-Based Simulators Ready for Prime Time? Comparisons of RSQSim with UCERF3 and Observations Kevin Milner, Bruce Shaw, Jacquelyn Gilchrist, Thomas Jordan 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 and... more	16273
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 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 015	EFP	Prospective test of the 1995 WGCEP SoCal earthquake forecast David Jackson In 1995 the Working Group on California Earthquake Probabilities published a 30-year forecast of magnitude 6 and larger earthquakes in southern California. SCEC organized and sponsored the report, and it was SCEC’s first major earthquake forecast in... more	17134
Poster 016	EFP	Earthquake Potential in California-Nevada Implied by Correlation of Strain Rate and Seismicity Yuehua Zeng, Mark Petersen, Zheng-Kang Shen Rock mechanics studies and dynamic earthquake simulations show that patterns of seismicity evolve with time through: (1) accumulation phase, (2) localization phase, and (3) rupture phase. We observe a similar pattern of changes in seismicity during... more	16219
Poster 017	EFP	Characterizing the Triggering Susceptibility of Characteristic Faults Morgan Page, Nicholas van der Elst, Bruce Shaw Statistical averages of earthquake triggering behavior, namely Gutenberg-Richter magnitude scaling, can produce foreshock probabilities that differ by orders of magnitude from fault-specific methods that employ characteristic magnitude distributions... 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 019	SP	Application of array-based early warning system to tsunami offshore Ventura, California Yuqing Xie, Lingsen Meng Extreme scenarios of M 7.5+ earthquakes on the Red Mountain and Pitas Point faults can potentially generate significant local tsunamis in southern California. The maximum water elevation could be as large as 10 m in the nearshore region of Oxnard... more
Poster 020	SP	Seismic source and path parameters in Central California estimated with recorded ground motion Jorge Crempien, Ralph Archuleta With strong motion networks deployed in Central California, we used recorded shear-waves generated by earthquakes to estimate shear-wave quality factor and kappa in this region. For this we used both a parametric and non-parametric approach, with 23... more	16054
Poster 021	SP	Methodology for Incorporation of 3-D Simulation Results into Non-Ergodic Ground-Motion Models for Central California Kathryn Wooddell, Norman Abrahamson In the last 10 years, the large increase in the number of recorded ground motions has shown that ergodic GMPEs that combine data from around the world into a single average ground-motion model do not work well for a specific earthquake scenario and... more
Poster 022	SP	Towards a High-Resolution Velocity Model with a Very Dense Array at Diablo Canyon, California Nori Nakata, Gregory Beroza Correlation-based analyses of ambient seismic wavefields is a powerful tool for retrieving subsurface information such as stiffness, anisotropy, and heterogeneity at a variety of scales. Especially with very dense arrays recently used for... 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 024	SP	Efficient blind search for small similar-waveform earthquakes in a decade of continuous seismic data (2007-2017) in coastal central California Clara Yoon, Karianne Bergen, Kexin Rong, Hashem Elezabi, Peter Bailis, Philip Levis, Gregory Beroza Template matching has proven to be a sensitive, discriminating detector of small events missing from earthquake catalogs, but a key limitation of this approach is that it requires prior knowledge of the earthquake signals we wish to detect. The... more
Poster 025	SP	Automated Waveform Assembling for Full-3D Tomography Alan Juarez, Thomas Jordan Seismological research has broadly focused on developing techniques for extracting information from seismograms and constructing models of seismic source excitation and Earth structure. Examples of modeling methods include the measurement and... more	EAR-1033462, G108C20038
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 027	Seismology	Stress- and structure-induced anisotropy in Southern California from two-decades of shear-wave splitting measurements Zefeng Li, Zhigang Peng We measure shear-wave splitting (SWS) parameters (i.e. fast direction and delay time) using 330,000 local earthquakes recorded by more than 400 stations of the Southern California Seismic Network (1995-2014). The resulting 232,000 SWS measurements... more	15081
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 029	Seismology	Imaging the San Gabriel and San Bernardino Basins with short-term Nodal deployments Robert Clayton, Fan-Chi Lin, Marine Denolle, Patricia Persaud, Jascha Polet We report on three seismic profiles across the San Gabriel and San Bernardino Basins (Northern Basins) in the Los Angeles Region that were run in the first quarter of 2017. The motivation for the survey is to better characterize the funneling of... more
Poster 030	Seismology	Crust azimuthal anisotropy beneath the eastern Tibetan Plateau revealed by ambient noise tomography Xue-Wei Bao, Xiaodong Song The continental collision between India and Eurasia in the Cenozoic has resulted in the rise and growth of the vast Tibetan Plateau (TP). Various geodynamic models, such as rigid-block extrusion, continuous deformation, and the mid-lower crustal... 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 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 033	Seismology	Shallow Earth Structure from Wind-Induced Ground Motion Jiong Wang, Toshiro Tanimoto Recently, earth scientists from different fields, such as seismology, climate studies and regular weather monitoring, have become increasingly interested in wind-induced ground motion. Due to developments of high-quality seismic network with co-... more
Poster 034	Seismology	3-D Velocity Model of the Coachella Valley Determined Using P-Wave First Arrival Times from the Salton Seismic Imaging Project and Local Earthquakes Rasheed Ajala, Patricia Persaud, Joann Stock, Gary Fuis, John Hole, Mark Goldman, Daniel Scheirer The shallow crustal structure in the Salton Trough has been recognized as the primary source of inaccuracy in the current Southern California Earthquake Center (SCEC) velocity model used for seismic hazard studies. Therefore, we improve the seismic... more	15190
Poster 035	Seismology	Separating non-diffuse component from ambient seismic noise cross-correlation in southern California Xin Liu, Gregory Beroza, Nori Nakata Cross-correlation of fully diffuse wavefields provides Green’s function between receivers, although the ambient noise field in the real world contains both diffuse and non-diffuse fields. The non-diffuse field potentially degrades the correlation... more
Poster 036	Seismology	Strong SH-to-Love Wave Scattering off the Southern California Continental Borderland Zhongwen Zhan, Chunquan Yu, Egill Hauksson, Elizabeth Cochran Seismic scattering is commonly observed and results from wave propagation in heterogeneous medium. Yet, deterministic characterization of scatterers associated with lateral heterogeneities remains challenging. In this study, we analyze broadband... more	17133
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 038	Seismology	Attenuation Tomography at High Frequencies in Southern California Yu-Pin Lin, Thomas Jordan Accurate 3-D models of crustal attenuation structure are important for simulating seismic wavefields at high frequencies (f > 1 Hz). Southern California is an excellent natural laboratory for studying crustal attenuation, owing to its high... more
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 040	Seismology	Rocking the Boat: Poro-elastic Stress Change at Seismogenic Depth Associated with Oil Production in the Los Angeles Basin in the Early 20th Century Susan Hough, Roger Bilham The Newport-Inglewood Fault and other faults in the southwestern Los Angeles Basin are characterized by low slip and seismicity rates; the rate of moderate (Mw4.0-6.4) earthquakes on these faults was, however a factor of ≈5 higher between 1920-1960... more
Poster 041	Seismology	Shallow crustal imaging in Southern California using ambient noise and fault zone trapped waves Fan-Chi Lin, Elizabeth Berg, Amir Allam, Hongrui Qiu, Yadong Wang, Yehuda Ben-Zion Better determination of shallow crustal structure is critical for earthquake hazard assessment. Here we present two efforts using detailed wavefield variation to investigate high-resolution crustal structure. In the first application, we extract... more	17195, 17229
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 043	Seismology	Reanalyzing the Rangely earthquake control experiment using machine learning Kaiwen Wang, William Ellsworth, Gregory Beroza In September 1969, the U. S. Geological Survey began a controlled injection experiment in an oil field in Rangely, Colorado, to test the effective stress hypothesis. Before, during and after the period when fluid pressure was modulated, a... more
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 045	Seismology	Permeability Changes Observed in the Arbuckle Group Coincident with Nearby Earthquake Occurrence Elizabeth Cochran, Kayla Kroll, Keith Richards-Dinger, Kyle Murray We investigate the temporal evolution of hydrologic properties of the ~2 km deep Arbuckle Group, the principal target in Oklahoma for saltwater disposal resulting from oil and gas production. Specifically, we look for changes to the hydrologic... 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 047	Seismology	Two years stress drop estimates for induced earthquakes in Oklahoma Nana Yoshimitsu, William Ellsworth, Gregory Beroza, Martin Schoenball Stress drop is important factor for a better understanding of ground motion intensity, which is commonly calculated from the seismic moment and corner frequency by comparing theoretical models to data in the frequency domain. In this study, we focus... more
Poster 048	Seismology	Identifying Long Period Long Duration Events Spatially Associated With Hydraulic Stimulation Operations Robert Walker, Abash Kumar, Richard Hammack, Brian Dressel, William Harbert, Fred Aminzadeh Long Period long duration seismic activity has been documented as observed in conjunction with hydraulic stimulation of low permeability hydrocarbon bearing formations. These LPLD events are similar to that observed in subduction zones, and is... 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 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

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