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 301-323 of 323

SCEC ID	Category	Title and Authors	SCEC Award
Poster 004	GM	Broadband Ground Motion and Variability from 3D Dynamic Rupture Simulations along the Wasatch Fault, Utah, incorporating both Stochastic Fault Roughness and Deterministic Long-wavelength Geometry Kyle Withers, Morgan Moschetti, Kenneth Duru We numerically model earthquake rupture on a fault surface that includes long-wavelength geometry matching that of the Salt Lake City segment of the Wasatch fault, Utah, in addition to superimposed stochastic fault roughness. We seek to better... more
Poster 250	Geology	The Wilmington Blind-Thrust Fault: An active, concealed earthquake source beneath Los Angeles, CA Franklin Wolfe, John Shaw, Andreas Plesch, Daniel Ponti, James Dolan, Mark Legg Analysis of 2D and 3D offshore seismic reflection profiles, petroleum and water wells, and recent mapping of groundwater aquifers in the southwestern Los Angeles basin indicate that the Wilmington blind-thrust fault is tectonically active and... more
Poster 211	FARM	Landers 1992 "reloaded": an integrative dynamic earthquake rupture model Stephanie Wollherr, Alice-Agnes Gabriel, Paul Mai The 1992 Mw 7.3 Landers earthquake raised awareness of unexpectedly large magnitude earthquakes caused by rupture of fault networks that were previously considered unconnected. While the overall kinematics of the event are thought to be well... more
Poster 026	GM	GMPE specific average velocity profiles for developing spatially-varying path coefficients Kathryn Wooddell, Linda Al Atik, Norman Abrahamson CyberShake simulations are being run to develop spatially-varying path coefficients in regions of sparse coverage that lack sufficient recorded earthquake ground motion data. The methodology for calculating the coefficients requires both 3D and 1D... more
Poster 104	Seismology	Modeling Crust of Columbia River Basalts Using Ambient Noise Recordings Mackenzie Wooten, Jorge Castillo Castellanos, Robert Clayton Flood-basalt eruptions are the Earth’s largest volcanic events and are thought to have caused massive extinction events. These events take part in the formation of hotspots and produce lavas that have covered much of the Earth’s surface. The... more
Poster 085	Seismology	Using Kinematic models to Evaluate the Back Projection Results Baoning Wu, Bo Li, David Oglesby, Abhijit Ghosh Back projection is a useful method for imaging the rupture process of large earthquakes. Despite great success in practice, there are still many questions on how to correctly interpret back projection results. First, the fundamental result of back-... more
Poster 077	Seismology	Characteristics of earthquake source complexity in the San Jacinto Fault Zone Qimin Wu, Xiaowei Chen We systematically analyze the source complexity of earthquakes in the trifurcation area of the San Jacinto Fault zone (SJFZ), which represents a right-lateral strike-slip system that is of high structural and geometric complexity and most... more	18087
Poster 122	Geodesy	Pre-seismic and Co-seismic Deformations in the Seismogenic zone of the Lushan MS7.0 earthquake Yanqiang Wu The spatiotemporal deformation response of a seismogenic fault to a large earthquake is of great significance to understanding the nucleation and occurrence of the next strong earthquake. The Longmeshan fault, where the 2008 Wenchuan MS 8.0... more
Poster 002	GM	Effect of source rupture directivity on the ground shaking from strike-slip earthquakes and its implication for directivity models Junju Xie, Paolo Zimmaro, Xiaojun Li, Zengping Wen We investigate spatial variability of observed ground motions, apparent period-dependence, and azimuthal variation, as well as narrow-banded effects on various intensity measures. We develop a simplified ground motion model that includes both... more
Poster 215	FARM	Compressional branching during the 2012 Mw 8.6 Off-Sumatra Earthquake: Implications from Earthquake Cycle Simulations Yuqing Xie, Lingsen Meng The 2012 Mw 8.6 Off-Sumatra earthquake is the largest strike-slip intraplate earthquake ever recorded by modern seismology. Previous Back-projection studies of this earthquake suggests two episodes of rupture branching into compressional fault... more
Poster 113	Geodesy	Surface Creep Rate of the Southern San Andreas Fault Modulated by Stress Perturbations from Nearby Large Events Xiaohua Xu, Lauren Ward, Junle Jiang, Bridget Smith-Konter, Ekaterina Tymofyeyeva, Eric Lindsey, Arthur Sylvester, David Sandwell Shallow surface creep, observed along a few seismically active strike-slip faults, is broadly understood to result from velocity strengthening materials in the uppermost (1-2 km) fault zone atop the velocity weakening materials at seismogenic depths... more	16177, 17042
Poster 109	Seismology	Detecting the Earth’s Interior Structure Using Reverse-Time Migration Based on Wavefield Normalized Cross-Correlation Imaging Condition Lei Yang, Gregory Beroza, Liang Zhao Increasingly dense arrays are being deployed globally and new imaging methods are being developed to constrain the fine details of the earth’s interior structure. In this study, we apply reverse-time migration (RTM), which is the most accurate... more
Poster 182	FARM	Effect of fault architecture and permeability evolution on response to fluid injection Zhuo Yang, Alissar Yehya, James Rice Injection-induced seismicity is thought to be due primarily to increase in fluid pore pressure along existing faults and fractures, which reduces their frictional strength. We address the modeling and prediction of the hydro-mechanical response due... more
Poster 220	Geology	Re-evaluation of the late-Pleistocene slip rate of the Haiyuan fault near Songshan, Gansu province, China WENQIAN YAO, Jing Liu, Michael Oskin, Veronica Prush, Wei Wang, Zhanfei LI Well-constrained fault slip rates are important for understanding strain partitioning within a fault system and the associated seismic hazard. The Haiyuan fault is an ~1000 km-long active strike-slip fault in the northeast margin of the Tibetan... more
Poster 083	Seismology	Relating teleseismic backprojection images to earthquake kinematics Jiuxun Yin, Marine Denolle Backprojection (BP) of teleseismic P waves is a powerful tool to study the evolution of seismic radiation of large earthquakes. The common interpretations on the BP results are qualitative comparisons with earthquake kinematic observations, such as... more
Poster 021	EEII	An Updated Compilation of VS30 in the United States Alan Yong, Devin McPhillips, Julie Herrick, Jessica Dozal VS30, the time-averaged shear-wave velocity (VS) to a depth of 30 meters, is a key index adopted by the earthquake engineering community to account for seismic site conditions. VS30 is typically based on geophysical measurements of VS derived from... more
Poster 269	SAFS	Holocene slip rates along the Mojave Section of the San Andreas fault Elaine Young, Eric Cowgill, Katherine Scharer The ∼100-km long Mojave section of the San Andreas fault is positioned within a double restraining bend of the fault in southern California. The Holocene slip rate on the Mojave San Andreas Fault (MSAF) is not well known, despite its importance for... more	12198, 17231, 17128
Poster 056	Seismology	Absolute and relative focal depth determination of moderate-sized earthquakes: An example from the 2010 El Mayor-Cucapah earthquake sequence Chunquan Yu, Egill Hauksson, Zhongwen Zhan, Elizabeth Cochran, Donald Helmberger Earthquake focal depth is a key parameter for understanding the geometry of fault zones, the rheology of the lithosphere and the tectonics of the continents. It is also crucial for seismic hazard assessment. Routine determination of earthquake focal... more	17044
Poster 057	Seismology	Cloud Computing and Big Data – Using the Southern California Earthquake Data Center (SCEDC) and the Southern California Seismic Network (SCSN) Products and Services for Earthquake Research Ellen Yu, Prabha Acharya, Aparna Bhaskaran, Shang-Lin Chen, Jennifer Andrews, Valerie Thomas, Egill Hauksson, Robert Clayton Improved Data Access: Looking for beta testers! The SCEDC is planning to store one month of continuous and triggered data in Amazon Web Services (s3) in preparation to store the SCEDC waveform archive as an Amazon Open Data Set. We are looking... more	18046
Poster 049	EFP	Uncertainties in Probabilistic Seismic Hazard Analysis for a Poisson Earthquake Occurrence Model Yuehua Zeng, Mark Petersen We revisit the theory for the probabilistic seismic hazard analysis (PHSA) and solve for the standard errors of the rate and probability of exceedance. We show that the PSHA defined by the probability of one or more ground motion exceedances over a... more
Poster 035	EFP	Induced Earthquake Forecasting in Oklahoma Using Models of Fluid Diffusion and Earthquake Nucleation Guang Zhai, Manoochehr Shirzaei There is a growing body of evidence suggesting that the recent 900-fold increase in the number of earthquakes in the eastern and central USA is linked to deep waste fluid disposal, co-produced with oil and gas productions. The current efforts to... more
Poster 195	FARM	Coupled interactions of fluid-pressure and earthquake cycles: Numerical simulations of fault-valve behaviour Weiqiang Zhu, Kali Allison, Eric Dunham Fluids are well known to play an essential role in controlling effective normal stress and hence fault strength. While most models of earthquake behavior assume a fixed pore pressure distribution, geologists have documented cyclic changes in fluid... more	18047
Poster 123	Geodesy	3D surface deformation in the 2016 MW 7.8 Kaikōura, New Zealand earthquake from optical image correlation: Implications for strain localization and tectonic evolution of the Pacific-Australian plate boundary Robert Zinke, James Hollingsworth, James Dolan, Russ Van Dissen We measure high-resolution, 3D surface deformation patterns resulting from the 2016 MW 7.8 Kaikoura, New Zealand earthquake using stereo WorldView satellite imagery, with an advanced workflow based on COSI-Corr subpixel optical image correlation.... more

The Southern California Earthquake Center is committed to providing a safe, productive, and welcoming environment for all participants. We take pride in fostering a diverse and inclusive SCEC community, and therefore expect all participants to abide by the SCEC Activities Code of Conduct.

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