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 251-300 of 305

SCEC ID	Category	Title and Authors	SCEC Award
Poster 174	FARM	Slip Patterns on Rate-and-State Faults with Heterogeneous Velocity-Weakening and Velocity-Strengthening Friction Kavya Sudhir, Nadia Lapusta Slip patterns on heterogeneous interfaces is a complex problem with a wide range of applications, including the nucleation of earthquakes in the transition band between the seismogenic zone and deeper, stably creeping regions and/or in rough fault... more	17154
Poster 112	Geology	Frictional strengths of fault gouge from a creeping segment of the Bartlett Springs Fault, northern California Jerlyn Swiatlowski, Diane Moore, David Lockner The Bartlett Springs Fault (BSF) is a right-lateral strike-slip fault that is part of the San Andreas Fault System in Northern California with an estimated slip rate of ~7 mm/yr. Near Lake Pillsbury, the BSF slip rate is expressed as fault creep at... more
Poster 240	EEII	Influence of Buildings Spacing in Site-City Interaction Effects Ricardo Taborda, Yigit Isbiliroglu We present initial results from a study focusing on the influence of the compactness of a city on the response of the ground and the dynamic behavior of buildings. It is well-known that individual soil-structure interaction effects are important... more
Talk Wed 09:00	EEII	A Vision for Regional Performance-Based Seismic Assessment Ertugrul Taciroglu Recent advances in performance-based seismic engineering and in existing information technologies provide opportunities to develop extremely granular inventories of the built environment and assess its vulnerabilities to earthquakes. This... more
Poster 189	FARM	Granular Temperature Measured Experimentally in a Shear Flow by Acoustic Energy Stephanie Taylor, Emily Brodsky Granular temperature may control high-speed granular flows, yet is difficult to measure in laboratory experiments. Here we utilize acoustic energy to measure granular temperature in dense shear flows for the first time. We show that acoustic energy... more
Poster 239	EEII	Evaluations of CyberShake simulated motions for use in engineering analysis Ganyu Teng, Jack Baker This poster presents the results from evaluation of simulated motions for building code analysis and practical engineering design at sites in the Los Angeles area. The feasibility of using physics-based ground motion simulations is studied by... more
Poster 097	Geodesy	A study of the December 2016, The Geysers, CA earthquake using InSAR and GPS Rachel Terry, Gareth Funning, Michael Floyd The Geysers geothermal field in northern California, the largest of its kind in the world, has historically sustained high seismicity rates, connected to the production of steam from the over 400 geothermal wells in the area. In addition, the... more
Poster 224	SDOT	Refining Southern California Geotherms Using Seismologic, Geologic, and Petrologic Constraints Wayne Thatcher, David Chapman, Amir Allam, Colin Williams Lithospheric deformation in tectonically active regions depends on the 3D distribution of rheology, which is in turn critically controlled by temperature. Under the auspices of the Southern California Earthquake Center (SCEC) we are developing a 3D... more	17028
Poster 065	Seismology	Seismicity and tectonic tremor associated with shallow offshore slow slip along the northern Hikurangi Margin, New Zealand Erin Todd Shallow (<15 km) slow slip events have been well documented offshore Gisborne on the northern Hikurangi Margin, New Zealand for over a decade. Gisborne slow slip events are associated with tectonic tremor downdip of the slow slip patch and... more
Poster 312	CEO	2017 UseIT: High Performance Computing Team Sarah Troise, Morgan Bent, Robert Hernandez, Rafael Cervantes, Jeffrey Hermosura, Matthew Martinez, Scott Callaghan, Jacquelyn Gilchrist, Jozi Pearson, Gabriela Noriega, Thomas Jordan As part of the 2017 Undergraduate Studies in Earthquake Information Technology (USEIT) internship program, students worked in collaborative groups to tackle unsolved problems in earthquake information technology presented in the form of a Grand... more
Poster 264	GM	Examining the relationship between stress drop and peak ground acceleration for small-to-moderate earthquakes in the San Francisco Bay Area Daniel Trugman, Peter Shearer Theoretical and observational studies have suggested that inter-event variability in the median ground motions of larger (M>5) earthquakes is controlled primarily by the dynamic properties of the earthquake source, such as Brune-type stress drop... more
Poster 105	Geodesy	Toward the 3-component time-dependent Crustal Motion Model: Integration of Sentinel-1 SAR interferometry and continuous GPS Ekaterina Tymofyeyeva, Yuri Fialko We combined data collected between 2014-2017 by the Sentinel-1 InSAR mission with continuous GPS measurements to calculate the three components of the interseismic surface velocity field in Southern California at the resolution of InSAR data (~100 m... more	17046
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 220	SDOT	Recognition of a dismembered positive flower structure along the San Jacinto fault: Stratigraphic and structural implications Emma Vierra, Heather Webb, Kristen Dennis, Daniel Peppard, Gary Girty, Thomas Rockwell The San Jacinto fault zone has accumulated up to ~24 km of dextral displacement. Over much of its mapped length the fault is relatively straight, varying from N50° to 60°W. Surface exposures along straight segments of the fault indicate generally... more
Poster 162	SAFS	Evidence for an active and evolving left-stepping San Andreas fault (Mission Creek fault strand) from the Little San Bernardino Mountains to Yucaipa Ridge Jesse Waco, Kimberly Blisniuk, Julie Fosdick This study presents new detailed field mapping and high-resolution topographical data to provide evidence for an alternative interpretation of fault geometry and slip transfer for the southern San Andreas fault zone, specifically the Mission Creek... more
Poster 132	Geology	Dekameter-scale geologic structure validation of shallow seismic properties along the San Jacinto fault at Sage Brush Flat, Anza, California Adam Wade, Ramon Arrowsmith, Andrea Donnellan, Frank Vernon, Yehuda Ben-Zion In support of observations and interpretations from the dense seismic array across the San Jacinto Fault Zone (SJFZ), we performed detailed (1:1000-1:2500 scale) mapping, excavation and unmanned aerial vehicle (UAV) data collection at Sage Brush... more	17805
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 221	SDOT	Fault and depositional architecture of the Catalina Basin, southern California Inner Continental Borderland: implications for hazards and basin evolution Maureen Walton, Daniel Brothers, James Conrad, Katherine Maier, Emily Roland, Jared Kluesner The Catalina Basin, located within the southern California Inner Continental Borderland (ICB), is traversed by two active offshore fault systems within the larger San Andreas distributed plate boundary system: the San Clemente Fault (along with a... 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 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 101	Geodesy	Postseismic deformation following the 2013 Mw 7.7 Balochistan (Pakistan) earthquake observed with Sentinel-1 Interferometry Kang Wang, Yuri Fialko The Mw 7.7 Balochistan earthquake occurred on September 24th, 2013 in southwestern Pakistan. The earthquake rupture was characterized by mostly left-lateral strike slip, with a limited thrust component, on a system of curved, non-vertical (dip angle... more
Poster 245	GM	Rupture Direction, Basin, Distance and Hanging-wall Effects on Ground Motions from M7 Earthquakes on the Salt Lake City Segment of the Wasatch Fault, Utah Nan Wang, Daniel Roten, Kim Olsen, James Pechmann We have analyzed numerical simulations of six M7 earthquakes on the Salt Lake City segment of the Wasatch fault, Utah, to better understand the long-period ground motions that these simulations predict in the adjacent Salt Lake Valley (SLV). The... more
Poster 073	Seismology	An Improved Method to Determine Coda-Q, Earthquake Magnitude, and Site Amplification: Theory and Application to Southern California Wei Wang, Peter Shearer The wavetrain following direct P and S is called the coda and is caused by scattered energy. Coda waves play an important role in seismology for measuring the attenuation of media, earthquake magnitude, and site amplification. We have developed an... more	G15AP00094
Poster 171	FARM	Dynamic Rupture Models of the 2015 Mw7.8 Nepal Earthquake Yongfei Wang, Steven Day, Marine Denolle The April 15th, 2015 Mw 7.8 Gorkha earthquake in Nepal occurred on a very shallowly dipping Main Himalayan Thrust (MHT) fault, where local fault geometry and proximity of the free surface will introduce asymmetry of stress and strain fields across... more
Poster 129	Geology	Can maximum magnitude be derived from fault dimensions? Debbie Weiser, Natanya Porto, David Jackson Maximum magnitude is an important parameter used in seismic hazard maps and risk assessment. Maximum magnitude is used to define the largest possible earthquake modeled for a specific fault, or for a defined area. To estimate maximum magnitude,... more
Poster 130	Geology	A predictive model for earthquake rupture extents given an early warning epicenter Steven Wesnousky, Glenn Biasi Steps and bends in faults affect the probability that rupture will continue to propagate along a fault. Empirical relationships for rupture through individual step and bend features have been developed through examination of past surface ruptures (... more	17064
Poster 072	Seismology	A detailed, automatically-derived, seismicity catalog for the San Jacinto fault zone (1998-2016) Malcolm White, Zachary Ross, Yehuda Ben-Zion, Frank Vernon Earthquake catalogs of provide foundational datasets for numerous studies on earthquake physics, dynamics of seismicity, fault structure at depth, tomography, stress inversions and seismic hazard analysis. The San Jacinto fault zone is the most... more
Poster 113	Geology	Testing the shorter and variable recurrence interval hypothesis along the Cholame segment of the San Andreas Fault Alana Williams, Ramon Arrowsmith, Thomas Rockwell, Lisa Grant Ludwig, Sinan Akciz, Allen Gontz The Cholame segment of the San Andreas Fault is positioned between the Parkfield and Carrizo segments to the NW and SE, respectively, 20 km southeast of Highway 46. Rupture behavior is poorly characterized for this ~75 km reach, limiting seismic... more	17017
Poster 127	Geology	A new estimate of latest Quaternary slip on the offshore Anacapa-Dume Fault at Sycamore Knoll, Southern California Continental Borderland Ethan Williams, Christopher Castillo, Simon Klemperer, Nicole Raineault, Lind Gee At the boundary between the Western Transverse Ranges province and Inner Continental Borderland of Southern California, strain is partitioned across the sinistral-oblique Anacapa-Dume Fault system. As the offshore continuation of the Santa Monica-... more
Poster 277	CS	Tsunami Squares: fast tsunami computation for use in coupled earthquake, tsunami, and ionosphere simulations John Wilson, John Rundle, Steven Ward, Andrea Donnellan, Tony Song, Attila Komjathy, Giorgio Savastano Tsunamis are one of the costliest natural disasters in terms of both economic impact and loss of life. Estimates of coastal inundation after a tsunamigenic earthquake inform evacuation decisions, but data about coseismic displacement and tsunami... more
Poster 251	GM	3-D Simulations of M9 Earthquakes on the Cascadia Megathrust Erin Wirth, Arthur Frankel, John Vidale, Nasser Marafi, William Stephenson The M9 Project is an interdisciplinary, NSF-funded effort aimed at understanding and reducing the potentially catastrophic impacts of large Cascadia earthquakes on the social, built, and natural environments. This work relies on developing a suite... more
Poster 246	GM	3D Dynamic Rupture Simulations along Dipping Faults, with a focus on the Wasatch Fault Zone, Utah Kyle Withers, Morgan Moschetti We study dynamic rupture and ground motion from dip-slip faults in regions that have high-seismic hazard, such as the Wasatch fault zone, Utah. Previous numerical simulations have modeled deterministic ground motion along segments of this fault in... more
Poster 128	Geology	Activity and earthquake potential of the Wilmington blind thrust, Los Angeles, CA: The largest earthquake source not on current southern California hazard maps? Franklin Wolfe, James Dolan, Andreas Plesch, John Shaw The Wilmington blind thrust fault may represent one of the largest deterministic seismic hazards in the United States, in that it extends for more than 30 km along strike beneath the densely populated Los Angeles metropolitan area and the Ports of... more
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 194	FARM	Investigating the physics behind VLFEs and LFEs: analysis based on dynamic rupture models with ductile-like friction Baoning Wu, David Oglesby, Abhijit Ghosh, Bo LI Very low frequency earthquakes (VLFE) and low frequency earthquakes (LFE) are two main types of seismic signal that are observed during slow earthquakes. These phenomena differ from standard (“fast”) earthquakes in many ways. In contrast to seismic... 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 103	Geodesy	Line-of-Sight Velocity Map along the San Andreas Fault System from GPS and Sentinel-1 InSAR: Contribution to the SCEC Community Geodetic Model Xiaohua Xu, David Sandwell We present a crustal deformation velocity map along the San Andreas Fault System by combining measurements from Sentinel-1 Interferometric Synthetic Aperture Radar (InSAR) and Global Positioning System (GPS) velocity models (CGM V1). We assembled 5... more	17042
Poster 061	Seismology	Frequency-Dependent Tidal Triggering of Low Frequency Earthquakes Near Parkfield, California Lian Xue, Roland Bürgmann, David Shelly The effect of small periodic stress perturbations on earthquake generation in most cases is not clear. However, the rate of low-frequency earthquakes (LFEs) near Parkfield, California has been found to be strongly correlated with solid earth tides.... more
Poster 304	CME	Seismogenic depth of the crust beneath the Japanese Island using Japan unified hIgh-resolution relocated catalog for earthquakes (JUICE) Tomoko Yano, Makoto Matsubara Inspired by the SCEC CME project, we have generated a high-resolution catalog called the “Japan Unified hIgh-resolution relocated Catalog for Earthquakes” (JUICE), which can be used to evaluate the geometry and seismogenic depth of active faults in... more
Poster 068	Seismology	Systematic Search for Repeating Earthquakes along the Central San Jacinto Fault Dongdong Yao, Zhigang Peng, Clara Daniels, Xiaofeng Meng Microearthquakes are much more abundant along the San Jacinto Fault (SJF) when compared to the nearby South San Andreas Fault (SAF), although their slip rates are somewhat similar. Many studies proposed that “brittle creep” could explain the... more
Poster 204	FARM	Dynamic Stress Changes during the 2015 Gorkha, Nepal Earthquake Lingling Ye, Nadia Lapusta, Jean-Philippe Avouac The rupture process during an earthquake is controlled by the pre-stress distribution and the frictional properties of the fault surface. Various friction laws have been developed based on laboratory experiments and widely used in earthquake dynamic... more	16274
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 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 095	Geodesy	The Far-Field Effect of Large Earthquakes in GPS Time-Series Zachary Young, Corné Kreemer The proper identification of earthquake-related offsets in GPS time-series is important, not only to characterize the earthquake and the elastic medium, but also because other parameters, most notably the rate, may be biased when offsets are not... more
Poster 075	Seismology	Depth Distribution of the 2010 El Mayor-Cucapah Earthquake Sequence (M>=4) Determined from Regional Waveform Modeling Chunquan Yu, Egill Hauksson, Zhongwen Zhan, Elizabeth Cochran The 2010 Mw 7.2 El Mayor-Cucapah earthquake ruptured bilaterally over a zone of about 120 km in length. The rupture terminates near the US-Mexico international border in the northwest and near the northern tip of the Gulf of California in the... more	Y86581
Poster 077	Seismology	Obspy, Web Services 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 The SCEDC archives continuous data from 10,578 data channels and 528 SCSN recorded stations in near real time. The SCEDC processes and archives an average of 16,000 earthquakes each year, forming an earthquake catalog dating back to 1932. The SCEDC... more	17089
Poster 187	FARM	Quantifying the coalescence process of microcracks leading to a system-size failure Ilya Zaliapin, Yehuda Ben-Zion We analyze Acoustic Emission (AE) data with the goal of quantifying the transition from distributed events to a system-size failure. Several data sets from different experiments provide information on the failure process in different rock types (... more	16023, 17065
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 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 275	GM	Near-Surface Shear-Wave Velocities determined using the Community Seismic Network (CSN) Dandan Zhang, Robert Clayton Near-surface shear-wave velocities (Vs30, for example) are used to characterize the site response for earthquake hazard. Unfortunately, most of the measurements are done by proxies like surface slope because the traditional seismic network such at... more

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