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 355

SCEC ID	Category	Title and Authors	SCEC Award
Talk 9/13 11:00	Seismology	Offshore Pacific-North America lithospheric structure and Tohoku tsunami observations from a southern California ocean bottom seismometer experiment Monica Kohler The motivation for the offshore ALBACORE seismic experiment was to identify the physical properties and deformation styles of the western half of the Pacific-North America plate boundary in southern California. An array of 34 ocean bottom... more
Poster 249	Seismology	MyShake: Initial Observations from a Global Smartphone Seismic Network Qingkai Kong, Richard Allen, Louis Schreier MyShake is a project aims to build a global smartphone seismic network that harnesses the power of crowdsourcing. This poster will present the initial observations from MyShake network after being released to public since Feb 2016. Based on the data... more
Poster 040	FARM	Localization and instability in sheared granular materials: Role of friction and vibration Konik Kothari, Ahmed Elbanna Shear banding and stick-slip instabilities have been long observed in sheared granular materials. Yet, their microscopic underpinnings, interdependencies and variability under different loading conditions have not been fully explored. Here, we use a... more
Poster 166	Geodesy	Using GPS Imaging to Resolve Seasonal Strain in Central California Meredith Kraner, William Hammond, Corné Kreemer, Geoffrey Blewitt Recently, studies using data from modern GPS have revealed that crustal deformation can be influenced by seasonal and nontectonic factors such as temperature, hydrology, and atmospheric loads. Statistically significant variations in annual micro-... more	16154
Poster 306	EFP	Systematic fluctuations in the global seismic moment release Corné Kreemer, Ilya Zaliapin We revisit the significance of the increased number of great earthquakes since 2005. Analysis of the global moment release during 1918–2012 shows that neither tapered nor doubly truncated Pareto model with time-independent parameters can... more
Poster 317	Simulators	Mitigating Induced Seismicity Through Active Pressure Management: Simulation-Based Studies Kayla Kroll, Keith Richards-Dinger, Joshua White The recent upturn of seismicity rates in the Central and Eastern United States and Canada has been attributed to industrial operations such as waste-water disposal, hydraulic fracturing, and subsurface carbon storage. We couple the 3D, physics-based... more
Poster 196	Seismology	A Simulation Approach for Better Understanding of Seismic Hazard and Risk in Montreal Yelena Kropivnitskaya, Kristy Tiampo, Jinhui Qin, Michael Bauer Despite the fact that seismic activity occurs primarily along plate boundaries, large earthquakes also occur within the plates and result in significant human and economic losses (Adams and Basham, 1989). Unlike seismicity along the plate boundaries... more
Poster 167	Geodesy	Seasonal motions and interseismic strain measured by continuous GPS throughout the Transverse Ranges, CA Hannah Krueger, Scott Marshall, Susan Owen, Gareth Funning, Jack Loveless Tectonic continuous GPS velocity estimates are complicated by quasiperiodic motions that arise due to seasonal variations in atmospheric conditions and/or anthropogenic activity. In southern California, a dense GPS network, large seasonal motions,... more	16171, 15079
Poster 322	Simulators	Exploring the sensitivity of multiscale seismic cycle simulations to material heterogeneities. Christodoulos Kyriakopoulos, Keith Richards-Dinger, James Dieterich We are presenting preliminary results on the estimation of the effects of variable material properties in the earthquake simulator RSQSim (Richards-Dinger and Dieterich, 2012). In order to do that we are calculating elastostatic solutions (Green’s... more
Poster 022	SDOT	Evidence for strong lateral seismic velocity variation in the lower crust – upper mantle beneath the California margin Voon Hui Lai, Robert Graves, Shengji Wei, Donald Helmberger Regional seismograms from earthquakes in Northern California show a systematic difference in arrival times across central and southern California where long period (30 – 50 seconds) SH waves arrive up to 15 seconds earlier at stations near the coast... more
Poster 115	Geology	Rupture zone characteristics of the 2010 El Mayor-Cucapah (Mexico) earthquake revealed with differential lidar Lia Lajoie, Ed Nissen Recent geodetic studies of surface deformation in large earthquakes have started to make connections between rupture characteristics and the mechanics, geometry, and material properties of the host faulting. Here, we investigate these relationships... more
Poster 286	GMSV	Ground Motion Simulation Validation using Small-to-Moderate Magnitude Events in the Canterbury, New Zealand Region Robin Lee, Brendon Bradley, Seokho Jeong This poster presents preliminary results from ground motion simulations of small-to-moderate magnitude (3<M_W<4.5) earthquake events in the Canterbury region over the past decade, for which centroid moment tensor solutions are available. The... more
Poster 113	Geology	Seafloor expression of active transpressional faulting offshore Southern California Mark Legg, Simon Klemperer, Christopher Castillo, Marie-Helene Cormier, Michael Brennan, Katy Croff Bell, Dwight Coleman, Chris Goldfinger, Jason Chaytor Recent observations using Remotely Operated Vehicles (ROV) of the seafloor along active transpressional fault zones offshore southern California reveal the morphology of active fault ruptures in the deep marine environment. Pressure ridges were... more	16097
Poster 082	Geology	Structural Architecture of the Western Transverse Ranges and Potential for Large Earthquakes Yuval Levy, Thomas Rockwell Fold-and- thrust belts 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 to... more
Poster 215	Seismology	Tremor and LFE activities using mini seismic array in the Alaska-Aleutian subduction zone Bo LI, Abhijit Ghosh Tremors and low frequency earthquakes (LFEs) have been well studied and observed as coupled phenomena in several subduction zones, such as the southwestern Japan, Cascadia and Costa Rica [Ghosh et al., 2012; Shelly et al., 2006; Brown et al., 2009... more	EAR 1358686
Poster 214	Seismology	Improved Understanding of Triggered Seismicity in the Salton Sea Geothermal Field with Waveform Matching Method Chenyu Li, Zhigang Peng, Dongdong Yao, Bridget Casey, Xiaofeng Meng Microseismicity can be easily triggered in volcanic and geothermal regions by stress perturbations from earthquake waves hundreds to thousands of kilometers away. Geothermal fields are seismically active with intensive microseismicity, and highly... more
Poster 176	Seismology	Fault Damage Zone of the 2014 Mw 6.0 South Napa Earthquake, California, Viewed from Fault-Zone Trapped Waves Yong-Gang Li, Rufus Catchings, Mark Goldman Prominent fault-zone trapped waves (FZTWs) were generated by aftershocks of the 2014 M6 South Napa earthquake and recorded at three dense linear arrays across the surface rupture of the West Napa Fault Zone (WNFZ) and the Franklin fault, which... more	15195
Poster 191	Seismology	Two decades of shear-wave splitting measurements in southern California Zefeng Li, Zhigang Peng We measure shear-wave splitting parameters (i.e. fast direction and delay time) of local earthquakes recorded by the Southern California Seismic Network from 1995 through 2014. A set of codes is used to automatically download three-component... more	15081
Poster 126	SoSAFE	Isochron burial dating of paleosols within the Whitewater Fan, northern Coachella Valley, California Nathaniel Lifton, Richard Heermance, Doug Yule, Brittany Huerta Remnant alluvial fan surfaces are ubiquitous features across the San Gorgonio Pass (SGP), distinguished by their perched location 50-150 m above the active channels and dark red, >1.5m thick soil horizons. Their potential utility in constraining... more	15135
Poster 177	Seismology	Topographic Influence on Near-Surface Seismic Velocity in southern California Jessica Lin, Seulgi Moon, Lingsen Meng, Paul Davis Near-surface seismic velocity is commonly used to determine subsurface rock structure, properties, and ground-motion amplification. The spatial distribution of Vs30 (shear-wave seismic velocity in the top 30 m of Earth’s crust) has been inferred... more	16076
Poster 212	Seismology	Evidence for Non-Self-Similarity of Microearthquakes Recorded at a Taiwan Borehole Seismometer Array Yen-Yu Lin, Kuo-Fong Ma, Hiroo Kanamori, Teh-Ru Song, Nadia Lapusta, Victor Tsai We investigate the relationship between seismic moment M0 and source duration tw of microearthquakes by using high-quality seismic data recorded with a vertical borehole array installed in central Taiwan. We apply a waveform cross-correlation method... more
Poster 228	Seismology	Apparent Attenuation at High Frequencies in Southern California Yu-Pin Lin, Thomas Jordan Accurately simulating strong motions for seismic hazard analysis requires accurate 3D models of crustal structure. At low frequencies (< 1 Hz), the amplitude reduction of seismic wavefields due to anelastic attenuation is relatively minor, and... more
Poster 129	SoSAFE	Mapping fault creep, frictional properties, and unrecognized active structures with dense geodetic data in the Imperial Valley, Southern California Eric Lindsey, Yuri Fialko The Imperial-Mexicali valley is well known as an area of significant earthquake hazard, but it remains a challenging target for geodetic studies because of agricultural and geothermal activity which obscures both short- and long-term deformation and... more
Poster 072	FARM	Tremor and Slow Slip in the West Antarctic Ice Sheet Bradley Lipovsky, Eric Dunham The Whillans Ice Plain region of the West Antarctic Ice Sheet experiences twice-daily, tidally-modulated slow slip events. During each event, 0.5 m of slip occurs over a 150x150 km area. Sliding initiates at one of several recurring locations and... more
Poster 253	Seismology	Constraining the velocity structure near the tremorogenic portion of the San Andreas Fault near Parkfield, CA using Ambient Noise Tomography Rachel Lippoldt, Robert Porritt, Charles Sammis The central section of the San Andreas Fault (SAF) displays a range of seismic phenomena including tectonic tremor, low frequency earthquakes (LFE), repeating micro-earthquakes (REQ), and aseismic creep. We investigate the seismic velocity structure... more
Poster 050	FARM	Stress heterogeneity at restraining double bends under multicycles and its effect on rupture propagation in 3D Dunyu Liu, Benchun Duan The conditions under which a rupture is able to propagate through geometrical complexity, such as restraining double bends, are crucial to the estimation of potential maximal event size on a fault system like the central Altyn Tagh Fault. Previous... more
Poster 080	Geology	Cumulative offsets revealed by airborne LiDAR along a “creeping” section of the Haiyuan fault, northern Tibetan plateau Jing Liu, Tao Chen, Yanxiu Shao, Peizhen Zhang, Kenneth Hudnut, Qiyun Lei, Zhanfei Li Airborne LiDAR is a powerful and efficient tool for acquiring topographic data with cm- to mm-resolution, a resolution high enough for detailed description of landforms and their small displacements along faults. It is therefore very appealing and... more
Poster 172	Seismology	Seismic Risk from Induced and Natural Earthquakes for the Central and Eastern United States Taojun Liu, Nicolas Luco, Abbie Liel Earthquake rates in some parts of the Central and Eastern United States have increased dramatically in the past few years, mostly due to wastewater injection associated with oil and gas activities. This induced seismicity has caused damage to... more
Poster 188	Seismology	Estimating amplitude uncertainty for normalized ambient seismic noise cross-correlation with examples from southern California Xin Liu, Gregory Beroza, Yehuda Ben-Zion We estimate the frequency-dependent amplitude error of ambient noise cross-correlations based on the method of Liu et al. (2016) for different normalizations. We compute the stacked cross spectrum of noise recorded at station pairs in southern... more
Poster 140	Geodesy	Combination of GPS and InSAR Data for Crustal Deformation Mapping Zhen Liu, Zheng-Kang Shen, Cunren Liang We are developing an approach to integrate GPS and InSAR data to generate 3-dimensional crustal motion map. Point-based discrete GPS measurements are first interpolated to produce continuous 3-D vector map at common grids covered by the InSAR data,... more
Poster 315	CSEP	Recent Achievements of the Collaboratory for the Study of Earthquake Predictability Maria Liukis, Maximilian Werner, Danijel Schorlemmer, John Yu, Philip Maechling, David Jackson, David Rhoades, Zechar Zechar, Warner Marzocchi, Thomas Jordan, the CSEP Working Group The Collaboratory for the Study of Earthquake Predictability (CSEP) supports a global program to conduct prospective earthquake forecasting experiments. CSEP testing centers are now operational in California, New Zealand, Japan, China, and Europe... more
Poster 309	EFP	Evaluating the use of declustering for induced seismicity hazard assessment Andrea Llenos, Andrew Michael The recent dramatic seismicity rate increase in the central and eastern US (CEUS) has motivated the development of seismic hazard assessments for induced seismicity (e.g., Petersen et al., 2016). Standard probabilistic seismic hazard assessment (... more
Poster 137	Geodesy	InSAR observations in Southern California Rowena Lohman, Kyle Murray We present InSAR time series results over Southern California, with a focus on the comparison between imagery from different platforms and spanning different time periods in the Riverside area. We use a processing approach that combines aspects of... more	15167
Poster 061	FARM	Dynamic Models of Large Ruptures on the Southern San Andreas Fault Julian Lozos The southern San Andreas Fault is a heterogeneous structure. Despite being a primary plate boundary fault, it has major geometrical complexities in the Big Bend and San Gorgonio Pass, and also shows substantial variation in maximum horizontal stress... more
Poster 207	Seismology	Nowcasting Oklahoma and The Geysers, California Molly Luginbuhl, John Rundle, Donald Turcotte Nowcasting is a new method of statistically classifying seismicity and seismic risk (Rundle et al., 2016). In this paper, the method is applied to the induced seismicity in Oklahoma and the induced seismicity at The Geysers geothermal region in... more
Poster 048	FARM	Spontaneous Dynamic Rupture Simulation on Geometrically Complex Faults Governed by Different Friction Laws Bin Luo, Benchun Duan The constitutive law describing how friction resistance evolves dynamically on the existing shear fault surface is one of the major factors controlling the behavior of dynamic earthquake rupture. The laboratory-derived rate- and state- friction laws... more
Talk 9/12 14:30	SDOT	How stressed are we really? Harnessing community models to characterize the crustal stress field in Southern California Karen Luttrell The in situ crustal stress field fundamentally governs, and is affected by, the active tectonic processes of plate boundary regions, yet questions remain about the characteristics of this field and the implications for active faults in the upper... more	15187, 16096
Poster 042	FARM	Brittle to ductile transition in a model of sheared granular materials Xiao Ma, Ahmed Elbanna Understanding the fundamental mechanisms of deformation and failure in sheared fault gouge is critical for the development of physics-based earthquake rupture simulations that are becoming an essential ingredient in next generation hazard and risk... more	16143
Poster 223	Seismology	Characterizing the Geometry and Seismotectonics of the Hilton Creek Fault System Kyle Macy, Amber Lacy, Jason De Cristofaro, Jascha Polet The Hilton Creek Fault System, in the Eastern Sierra Nevada, is characterized as a single NW-striking, NE-dipping, normal fault from Davis Lake to the southern rim of the Long Valley Caldera. Within the Caldera, the fault splays into multiple,... more
Poster 024	SDOT	Discriminating Between Induced vs Tectonic Seismicity in Intraplate Regions: the Contribution of the Long-Term History of Fault Behavior Maria Beatrice Magnani, Michael Blanpied, Heather DeShon, Matthew Hornbach Since 2009 there has been an increase in rate of seismicity in the Central U.S. (CUS), a major fraction of which has been associated with shale gas production and related wastewater injection. The surge of seismicity has resulted in an increased... more
Poster 086	Geology	Paleoseismic investigation of the Rose Canyon fault zone, San Diego, CA Eui-jo Marquez, Jillian Maloney, Thomas Rockwell, Neal Driscoll, Scott Rugg, Jeff Babcock The Rose Canyon fault zone (RCFZ) bisects the City of San Diego, the 8th largest city in the U.S., and represents a major seismic hazard to the greater metropolitan area that includes Tijuana and surrounding cities. Onshore studies have shown that... more	16195
Poster 151	Geodesy	Is the CFM5.0 an Improvement? Evidence from Mechanical Models of the Western Transverse Ranges Region Scott Marshall, Gareth Funning, Susan Owen The SCEC Community Fault Model (CFM) is a widely-used product that has existed for well over a decade and has seen numerous revisions. As with all community-derived products, testing the accuracy and performance of the model is key to further... more	14040, 15079, 16171, 13056
Poster 252	Seismology	Geophysical characterization of twelve CSMIP station sites in Riverside County, California Antony Martin, Lauren Demine, William Dalrymple, Nolan Leue, David Carpenter The California Geological Survey recently funded geophysical characterization of 12 California Strong Motion Instrument Program (CSMIP) stations in western Riverside County, California. The purpose of the investigation was to develop a shear wave... more
Poster 238	Seismology	Measuring aseismic slip through characteristically repeating earthquakes at the Mendocino Triple Junction, Northern California Kathryn Materna, Taka'aki Taira, Roland Bürgmann The Mendocino Triple Junction (MTJ), at the transition point between the San Andreas fault system, the Mendocino Transform Fault, and the Cascadia Subduction Zone, undergoes rapid tectonic deformation and produces more large (M>6.0) earthquakes... more
Poster 123	SoSAFE	Geologic framework of the El Casco 7.5’ quadrangle: southwestern gateway to the San Gorgonio Pass knot in the San Andreas Fault zone Jonathan Matti The El Casco 7.5' quadrangle is located at the SW portal of San Gorgonio Pass (SGP), where Quaternary contractional deformation in SGP gives way to transtensional deformation associated with the right-lateral San Jacinto Fault. Important... more
Poster 059	FARM	Development of extensional step overs within anisotropic systems: Implications for the Rodgers Creek-Hayward step over Jessica McBeck, Michele Cooke The Rodgers Creek-Hayward extensional step over, within the San Pablo bay in northern CA, USA, is estimated to pose one of the highest likelihoods of rupture in northern CA. To better constrain the fault geometry of the step over at seismogenic... more
Poster 142	Geodesy	Steady and time-dependent strain rate maps of California from inversion of GPS time series Robert McCaffrey The GPS displacement time series from the Plate Boundary Observatory (PBO), Crustal Motion Model 4 (Shen et al., 2011), the Pacific Northwest (McCaffrey et al., 2013), University of Nevada Reno (UNR) and others are used to estimate time-dependent... more	16083
Poster 125	SoSAFE	Work in progress to estimate a Latest Pleistocene slip rate for the Banning Strand of the San Andreas Fault near North Palm Springs Sally McGill, Paula Figueiredo, Lewis Owen Existing late Pleistocene slip rate estimates for the southern San Andreas fault reveal high rates of slip on the Mission-Mill Creek strand in the Indio Hills but very low rates on that strand farther northwest in the San Bernardino Mountains. The... more	15182
Poster 210	Seismology	Observations of the Temporal Evolution of Earthquake Ruptures Men-Andrin Meier Source time functions (STFs) of individual earthquakes show an enormous variability. Yet, the large amount of earthquake source data available today allows extracting common features among groups of earthquakes, and to compare the "typical... more
Poster 124	SoSAFE	Slip variability and temporal clustering along the Imperial fault at Mesquite Basin, Imperial Valley, California, and possible through-going rupture to the San Andreas fault Aron Meltzner, Thomas Rockwell, Rebecca Tsang, Paula Figueiredo Paleoseismic trenches across the Mesquite Basin section of the Imperial fault revealed several channels that cross the fault at a high angle and that are displaced in the subsurface. These channels incised into and are embedded within lacustrine... more	07007

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.

Category:
Author:
Title:
Abstract:
Format:
Only show abstracts with PDFs

Meeting Abstracts

IMPORTANT DATES

For Researchers

For The Media