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 056	Seismology	Detailed observations of seismicity, stress drop and directivity on a complex fault structure in Mogul Nevada Rachel Abercrombie, Christine Ruhl, Ken Smith The exceptionally well-recorded Mogul earthquake sequence, near Reno NV in 2008 allows detailed investigation of seismicity migration, and propagation through complex structures. Following two months of swarm-like earthquakes an increase in both... more
Poster 207	SDOT	Spatio-temporal variations of stress parameters in the San Jacinto Fault Zone Niloufar Abolfathian, Patricia Martínez-Garzón, Yehuda Ben-Zion We discuss variations of stress parameters in the San Jacinto Fault Zone based on a refined stress inversion methodology [Martínez-Garzón, 2016a] and a focal mechanism catalog for the years 1981-2015 (Yang et al. 2012, extended to 2015). The stress... more	17023
Poster 057	Seismology	Preliminary insights into the fault geometry and rupture history of the 2016 Mw 7.8 Kaikoura, New Zealand, earthquake Mareike Adams, Chen Ji The November 14th 2016 MW 7.8 Kaikoura, New Zealand earthquake occurred along the east coast of the northern part of the South Island. The local tectonic setting is complicated. The central South Island is dominated by oblique continental... more
Poster 214	SDOT	Learn to be still: Accounting for the hydrologic contributions to GPS displacements in the continental United States Susheel Adusumilli, Adrian Borsa, Francesca Silverii, Duncan Agnew Using the decade-long record of continuous GPS observations, we estimate mass fluxes across the contiguous United States by inverting station displacements for terrestrial water storage anomalies. We further improve this estimate by jointly... more
Poster 173	FARM	A Machine Learning Approach to Earthquake Rupture Dynamics Sabber Ahamed, Eric Daub Dynamic rupture propagation is a challenging problem due to uncertainty regarding the underlying physics of earthquake slip, and the stress conditions and frictional properties of fault are not well constrained. These unknown initial stresses and... 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 059	Seismology	Thermomechanical earthquake cycle simulations with rate-and-state friction and nonlinear viscoelasticity Kali Allison, Eric Dunham We simulate earthquake cycles on a 2D strike-slip fault, modeling both rate-and-state fault friction and an off-fault nonlinear power-law rheology. The power-law rheology involves an effective viscosity that is a function of temperature and stress,... more	7272
Poster 163	SAFS	Measurements of Ground-Based Magnetics and Vertical Deformation From a Leveling Line Across the San Andreas Fault at Durmid Hill Karen Alvarez, Jascha Polet The Durmid Hill region is located near the termination of the San Andreas Fault (SAF) at Bombay Beach. This section of the fault has not experienced any major earthquakes in the past three centuries. Fuis et al. (2017) showed that the SAF is dipping... more
Poster 156	SAFS	Preliminary paleoslip results from the Pearblossom site on the Mojave section of the San Andreas Fault Emery Anderson-Merritt, Eric Cowgill, Katherine Scharer, Amanda Keen-Zebert The late Quaternary slip rate along the Mojave section of the San Andreas fault (MSAF) (~30 mm/yr) [1] appears to be twice as large as geodetic estimates (~15 mm/yr) [2], although it is unclear if this difference is real or stems from assumptions in... more	17231, 12198, 11061
Poster 139	Geology	Quaternary Rates of Slip for faults of the Central Walker Lane Stephen Angster, Steven Wesnousky, Lewis Owen, Paula Figueiredo, Sarah Hammer The Walker Lane shear zone trends northwest along the eastern Sierra Nevada and accommodates a significant portion of North American-Pacific Plate relative transform motion. In the central portion of the Walker Lane, the Benton Springs, Petrified... more
Poster 271	GM	A velocity model for basin sediments in Southern California based on field measurements Domniki Asimaki, Jian Shi, Ricardo Taborda Geotechnical data from soils and weathered rocks on regional scales are sparse and discontinuous. On the same time, these shallow crustal formations can have a significant effect on the amplitude, frequency and duration strong ground motions,... more	16028
Poster 185	FARM	Modelling the spatio-temporal pattern of heterogeneous stresses and strain accumulation due to earthquake rupture on a geometrically complex fault Khurram Aslam, Eric Daub We perform physics-based simulations of earthquake rupture propagation on geometrically complex strike-slip faults. We consider many different realization of the fault roughness and obtain heterogeneous stress fields by performing dynamic rupture... more	17182
Poster 111	Geology	Hematite nano- to micro-textures and (U-Th)/He thermochronometry inform seismic and aseismic fault damage zone processes Alexis Ault, Robert McDermott, Amy Moser, James Evans Hematite fault mirrors and striated, metallic slip surfaces in exhumed fault zones record disparate thermal and mechanical processes. Hematite is amenable to (U-Th)/He (He) dating and accurate interpretation of hematite He data requires hematite... more	14125, 17164
Poster 116	Geology	Comparison of fault rocks formed paleoseismically and by paleocreep(?): Initial results from the West Salton detachment fault, southern California Gary Axen, Katrina Soundy, Virgil Leuth The West Salton detachment fault bounds the western Salton Trough (upper plate) above the Peninsular Ranges footwall. 10-15 km of top-E, low-angle normal slip from ~8 Ma to ~1 Ma (during San Andreas plate boundary activity) exhumed the footwall ~5-... more	17114
Poster 191	FARM	Experimental Study of Thermal Pressurization Weakening and the Role of Fault Roughness Nir Badt, Terry Tullis, Greg Hirth Dynamic weakening due to pore fluid thermal pressurization is controlled by the hydraulic properties of the host rock, including the permeability (k) and the available pore space. Rough sliding interfaces dilate and contract during slip, in... more	17249
Poster 213	SDOT	Ten Years of Seasonally Modulated Strain History in Southern California Inferred from cGPS Data Alireza Bahadori, Jeonghyeop Kim, Meredith Kraner, William Holt We quantify transient strain changes in southern California along with their statistical significance using cGPS data. We use PBO station data processed by NSF’s GAGE Facility at UNAVCO. We also analyzed cGPS data processed by the University of... more	16291, 14226
Talk Mon 11:30	EEII	Characterization of spatial correlations in ground motions—insights from physics-based simulations Jack Baker, Yilin Chen This talk presents statistical methods to quantify spatial correlations in the intensity of ground shaking across a region in a given earthquake, using observed and simulated ground motions. Risk assessment of spatially distributed building... more
Poster 055	Seismology	Proposed Community Stress Drop Validation Experiment Annemarie Baltay, William Ellsworth, Martin Schoenball, Gregory Beroza We propose to undertake a rigorous community stress drop validation study, and present here a draft “experimental design” for community review and feedback. Earthquake stress drops are notoriously variable and difficult to measure; as such,... 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 070	Seismology	Linking seismicity and fault surface properties Magali Barba, Kristy Tiampo, Margaret Glasscoe Recent work linking asperities and seismicity suggests that changing the spatial configuration of asperities or increasing the total number of asperities can generate a greater number of larger events (Kazemian et al., 2013). The expansion of... more
Poster 192	FARM	Examination of multi-scale flash-heating at seismic slip rates in granite Monica Barbery, Omid Saber, Frederick Chester, Judith Chester As sliding velocities approach seismic slip rates, a significant reduction in the coefficient of friction of rock can occur as a result of weakening of microscopic asperity contacts by flash heating. Utilizing a high-speed, high-acceleration biaxial... more
Poster 176	FARM	Incorporating anisotropic material properties into simulations of the earthquake cycle Maricela Best Mckay, Brittany Erickson We are developing a methodology for incorporating and studying the effects of anisotropy when simulating the full earthquake cycle. The method is developed for a vertical strike-slip fault in two-dimensions, with antiplane motion. Inertial terms are... more
Poster 219	SDOT	Getting pushy with the San Gorgonio Pass: Investigating active fault geometries with crustal deformation models Jennifer Beyer, Michele Cooke, Scott Marshall Assessment of seismic hazards in southern California may be improved with more accurate characterization of the active San Andreas fault strands within the San Gorgonio Pass region. On-going debate centers on the activity level and active geometry... more
Poster 198	FARM	Carbonaceous fault-related rocks in SAFOD Phase III core: Indicators of fluid-rock interaction and structural diagenesis during slip Krishna Borhara, Kelly Bradbury, James Evans At elevated temperatures, many carbon-bearing fault zones are subjected to thermal maturation, fluid-rock interactions, and/or shear-induced phase transformations, often yielding various fault weakening agents. Black carbonaceous material documented... more	17207
Poster 081	Seismology	Rapid Line-Source and Ground-Motion Estimates for Earthquake Early Warning Using FinDer Version 2 Maren Böse, Deborah Smith, Claude Felizardo, Men-Andrin Meier, Thomas Heaton, John Clinton Characterizing earthquakes in real-time, for applications like earthquake early warning, requires a flexible modeling approach that can accommodate a small earthquake becoming large as fault rupture evolves over time. Hence, we present a modeling... more
Poster 270	GM	The Site Response of Surface Waves Daniel Bowden, Victor Tsai Standard calculations of site-specific amplification assume a vertically-incident shear wave, or at least rely on the assumption that a single site-response transfer function can be observed empirically. Cases where surface waves may play an... more
Poster 274	GM	Basin ZX Maps for use in the USGS National Seismic Hazard Model for the Western United States Oliver Boyd, Eric Thompson, Allison Shumway, Morgan Moschetti, William Stephenson, Sanaz Rezaeian Seismic hazard assessments depend on an accurate prediction of ground motion, which depends on properties of the earthquake source, propagation path, and site amplification. Here, we focus on long-period site response that is sensitive to basin... more
Poster 253	GM	SeisFinder: A web application for extraction of data from computationally-intensive earthquake resilience calculations Brendon Bradley, Sharmila Savarimuthu, Daniel Lagrava, Jonney Huang, Jason Motha, Viktor Polak, Sung Bae SeisFinder is an open-source web service developed by QuakeCoRE and the University of Canterbury, New Zealand. It aims to promote further research and collaboration by sharing the computationally-intensive resilience calculations produced by... more
Poster 280	CS	Fused Seismic Simulations with the Discontinuous Galerkin Method at Extreme-Scale Alexander Breuer, Alexander Heinecke, Yifeng Cui We present EDGE, a solver for hyperbolic partial differential equations with emphasis on seismic setups. EDGE is designed from scratch to exploit inter-simulation parallelism by fusing simulations. Fused simulations are a novel technique... more	16247
Poster 087	Geodesy	Can deformation rates across the Carrizo Plain segment of the San Andreas Fault be explained by vertical migration of the locked to-creeping transition? Lucile Bruhat, Paul Segall Most geodetic inversions of surface deformation rates consider the depth distribution of interseismic fault slip-rate to be time invariant. However, some numerical simulations show down-dip penetration of dynamic rupture into regions with velocity-... more	17136
Poster 259	GM	Additional Interpretation of the Orientations of Precariously Balanced Rocks in the Band Between the San Jacinto and Elsinore Faults James Brune, John Anderson, Richard Brune In a previous study Brune et al.(2006), found most of the precariously balanced (PBRs) along the line of PBRs between the San Jacinto and Elsinore faults were most sensitive to strong motion perpendicular to the faults, whereas the directivity pulse... more
Poster 267	GM	Focal mechanism effects on S/P amplitude ratios in southern California Janine Buehler, Debi Kilb, Frank Vernon, Wei Wang, Peter Shearer Ground Motion Prediction Equations (GMPEs) are key in seismic hazard analysis and incorporate information about the earthquake source, the source-receiver path, and influences from the near-station region. Ground motion variations that result from... more
Poster 211	SDOT	The effect of InSAR time series generation techniques on signals with small spatial scales Paula Burgi, Rowena Lohman As the rate of growth of InSAR catalogs continues to increase, analysis of these large datasets must be done thoughtfully and efficiently to manage the computational burden. One of the key decisions made during InSAR time series generation is the... more
Poster 238	EEII	70%-damped spectral acceleration as a ground motion intensity measure for predicting highly nonlinear response of structures Kenny Buyco, Thomas Heaton In engineering practice, the most common ground motion intensity measure for predicting structural response is spectral acceleration (Sa) with a period of T1 (the structure’s fundamental period) and a damping ratio of 5%, denoted here Sa(T1,5%). Sa(... more
Poster 263	GM	A Ground Motion Prediction Equation for Earthquakes Mw 4-6 in Oklahoma and Kansas Derived from a Composite Recorded/Simulated Ground Motion Catalog Samuel Bydlon, Kyle Withers, Eric Dunham Recent increases in seismic activity in historically quiescent areas such as Oklahoma, Texas, and Arkansas have spurred the need for an investigation into expected ground motions associated with these seismic sources. This seismicity increase... more
Poster 303	CME	CyberShake: bringing physics-based PSHA to central California Scott Callaghan, Philip Maechling, Christine Goulet, Kevin Milner, Robert Graves, Kim Olsen, Thomas Jordan The SCEC CyberShake computational platform is a collection of scientific software integrated with workflow tools which performs physics-based probabilistic seismic hazard analysis (PSHA) using 3D deterministic wave propagation simulations.... more
Talk Mon 11:00	CME	10 years of CyberShake: Where are we now and where are we going with physics-based PSHA? Scott Callaghan, Robert Graves, Kim Olsen, Yifeng Cui, Kevin Milner, Christine Goulet, Philip Maechling, Thomas Jordan 2017 marks 10 years of development on SCEC's physics-based probabilistic seismic hazard analysis (PSHA) platform, CyberShake. CyberShake establishes an updated PSHA methodology that utilizes multiple SCEC community products, including UCERF to... more
Poster 159	SAFS	Preliminary ages of prehistoric earthquakes on the Banning Strand of the San Andreas Fault, near North Palm Springs, California Bryan Castillo, Sally McGill, Katherine Scharer, Doug Yule, Devin McPhillips, James McNeil, Alan Pace The southernmost section of the San Andreas Fault (SAF) is the only section of that fault that has not ruptured historically. It is not known whether this long quiescent period reflects a long average recurrence interval for this portion of the... more	15182
Poster 085	Seismology	Complex Rayleigh Wave Effects on the Seismic Demands of Mid-Rise Buildings Jorge Castillo Castellanos, Monica Kohler, Anthony Massari, Robert Clayton Observations of earthquake motions recorded by spatially dense seismic arrays in buildings located in the northern Los Angeles basin suggest the presence of complex, amplified surface wave effects on the seismic demand of mid-rise buildings. Several... more
Poster 166	FARM	Slip partitioning and scaling relations of repeating earthquakes on rate-state faults Camilla Cattania, Paul Segall, Sebastian Hainzl Small repeating earthquakes, characterized by similar waveforms, are thought to represent the rupture of isolated asperities loaded by creep. They are very periodic, making them an ideal natural laboratory to study the factors determining the... more
Poster 134	Geology	Large paleoearthquake timing and displacement near Damak in eastern Nepal on the Himalayan Frontal Thrust Deepak Chamlagain, Steven Wesnousky, Yasuhiro Kumahara, Ian Pierce, Tabor Reedy, Stephen Angster, Bibek Giri An excavation across the Himalayan Frontal Thrust near Damak in eastern Nepal shows displacement on a fault plane dipping ~22° has produced vertical separation across a scarp equal to 5.5 m. Stratigraphic, structural, geometrical, and radiocarbon... more
Poster 233	CXM	The Pelona–Orocopia–Rand and related schists of southern California: a review of the best-known archive of shallow subduction on the planet Alan Chapman The Pelona–Orocopia–Rand and related schists of southern California are an archetypal example of an exhumed shallow subduction complex. ‘The schist’ comprises mainly trench materials underthust beneath continental arc rocks during Late Cretaceous–... more
Poster 071	Seismology	Tectonic tremor in San Andreas Fault near Cholame captured by a mini seismic array Kuntal Chaudhuri, Abhijit Ghosh The San Andreas Fault, a right lateral strike slip fault, is one of the most well-studied faults on the planet earth. However, our understanding of slow earthquakes, tremor and its relationship with regular earthquakes remains poor. Many studies... more
Poster 080	Seismology	Toward a more robust tsunami early warning system: integration of real-time GPS, strong motion and teleseismic data for fast seismic source inversion Kejie Chen, Zhen Liu, Tony Song Compared with seismometers, GPS receivers record co-seismic displacements directly without saturation, which is particularly sensitive to characterize mega tsunamigenic earthquakes and especially important for tsunami early warning. As a result, the... more
Poster 172	FARM	The material-geometry nexus: Understanding topographic effects on wave propagation Qianli Chen, Ahmed Elbanna Topographic effects are associated with the presence of strong topographic relief (hills, ridges, canyons, cliffs, and slopes), complicated subsurface topography (sedimentary basins, alluvial valleys), and geological lateral discontinuities (e.g.,... more
Poster 201	FARM	Diverse volumetric seismicity in the Trifurcation area of the San Jacinto fault zone Yifang Cheng, Zachary Ross, Yehuda Ben-Zion The trifurcation area of San Jacinto fault zone is highly active, producing over 10% of all Southern California earthquakes during 2000-2016 and frequent M > 3.5 earthquakes with an apparently increasing rate. To understand the seismicity... more
Poster 305	CEO	SeedMe: Data Sharing Building Blocks Amit Chourasia, David Nadeau, Michael Norman Data sharing is essential and pervasive in scientific research. The requirements for data sharing vary as research projects mature and iterate through early designs and prototypes with a small number of collaborators, and develop into publishable... 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 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 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

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