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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.


A SCEC username is required to submit an abstract.

The person submitting the abstract is automatically the First Author, and will receive all communications regarding the abstract.

First Authors can submit a maximum of one poster presentation abstract and one oral presentation abstract (if invited as a plenary speaker).

Abstracts should not exceed 2,500 characters in length.

Every poster will be on display from Sunday evening through Tuesday evening.

Poster dimensions cannot exceed 45 inches high x 45 inches wide.

Results 1-50 of 305
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SCEC ID Category Title and Authors SCEC Award
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

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
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

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

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
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
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

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
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
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
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
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
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
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
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

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

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

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

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

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

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
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

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

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

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
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
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

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

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

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

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

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
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

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

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

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

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

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

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

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

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

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

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