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 355

SCEC ID	Category	Title and Authors	SCEC Award
Poster 043	FARM	Flexible implementation of multiphysics and discretizations in PyLith crustal deformation modeling software Brad Aagaard, Charles Williams, Matthew Knepley We are creating a flexible implementation of multiphysics and finite-element discretizations in PyLith, a community, open-source code (http://geodynamics.org/cig/software/pylith/) for modeling quasi-static and dynamic crustal deformation with an... more
Poster 254	Seismology	Comparison of LASSIE observed travel times and amplitudes with predicted values from SCEC velocity models. Zagid Abatchev, Paul Davis A dense broadband survey (LASSIE Los Angeles Seismic Syncline Interferometry Experiment) was conducted to improve our velocity and structure models for the Los Angeles Basin region. The survey was a cooperative experiment among industry, academia... more	15018
Poster 063	FARM	Earthquake source parameter validation using multiple-scale approaches for induced seismicity in Oklahoma Rachel Abercrombie, Xiaowei Chen The rapid increased seismicity rate in central US has drawn significant attention to the associated earthquake hazards in intraplate regions. Whether induced earthquakes have similar stress drops to tectonic events is an important question for... more
Poster 013	SDOT	Towards Detailed Characterization of Spatio-temporal Variations in Stress Parameters along the San Jacinto Fault Zone Niloufar Abolfathian, Patricia Martínez-Garzón, Yehuda Ben-Zion Accurate determination of stress parameters (orientation of principal stress axes and stress ratio) operating on fault zones provides refined knowledge on source physics and deformation processes. We developed a refined stress inversion... more
Poster 240	Seismology	An energy-based smoothing constraint and the uncertainty range of co-seismic stress drop of large earthquakes Mareike Adams, Jinglai Hao, Cedric Twardzik, Chen Ji The large uncertainties of some basic earthquake source parameters, such as average stress drop (Cotton et al., 2013), are largely caused by over-simplifications of the source (e.g., Madariaga, 1979). In contrast, the results of finite fault source... more
Poster 312	CSEP	Dependence of b-value on depth, co-seismic slip, and time for large magnitude earthquakes John Aiken, Takahiko Uchide, Danijel Schorlemmer Spatial and temporal variations in parameters of earthquake sources and seismicity will be a key to understand the status of faults such as applied stress and fault strength and hence the potential of earthquake occurrence. Recent studies have shown... more
Poster 201	Seismology	Constraints on Fault Damage Zone Properties and Normal Modes from a Dense Linear Array Deployment along the San Jacinto Fault Zone Amir Allam, Fan-Chi Lin, Pieter-Ewald Share, Yehuda Ben-Zion, Frank Vernon, Gerard Schuster, Marianne Karplus We present earthquake data and statistical analyses from a month-long deployment of a linear array of 134 Fairfield three-component 5 Hz seismometers along the Clark strand of the San Jacinto fault zone in Southern California. With a total aperture... more
Poster 321	Simulators	Earthquake cycle simulations with rate-and-state friction and linear and nonlinear viscoelasticity Kali Allison, Eric Dunham We have implemented a parallel code that simultaneously models both rate-and-state friction on a strike-slip fault and off-fault viscoelastic deformation throughout the earthquake cycle in 2D. Because we allow fault slip to evolve with a rate-and-... more	16239
Poster 265	GMP	Towards Implementation of Multi-Segment Ruptures in the Broadband Platform: Composite Source Model John Anderson One major goal of the Broadband Platform for 2016 is to implement multi-segment ruptures. One straightforward approach under consideration is to generate ground motions from each segment separately, and then add them with an appropriate time lag.... more	16216
Poster 094	Geology	Quaternary Expression of Northern Great Valley Faults and Folds: Accommodating North-South Contraction in the Northeastern California Shear Zone Stephen Angster, Thomas Sawyer, Steven Wesnousky The Northern California Shear Zone accommodates North American intraplate right-lateral transpressional shear driven by the relative motions of the northwest translating Sierran microplate and clockwise rotating Oregon Costal block. Within this... more
Poster 057	FARM	Investigating the high-frequency, weak-motion nucleation phase initiating the June 10th, 2016 Mw 5.2 Borrego Springs Earthquake Adam Arce, Mareike Adams, Chen Ji A nucleation phase, when present, offers insight into an earthquake’s rupture mechanics and may corroborate the “cascade” rupture model. In cascade rupture, slip initiates on a relatively small patch progressing into slip on a larger patch and so on... more
Poster 325	CEO	www.fallasdechile.cl, the First Online Repository for Neotectonic Faults in the Chilean Andes Felipe Aron, Valeria Salas, Constanza Bugueño, César Hernández, Luis Leiva, Isabel Santibáñez, José Cembrano We introduce the site www.fallasdechile.cl, created and maintained by undergraduate students and researchers at the Catholic University of Chile. Though the web page seeks to inform and educate the general public about potentially seismogenic faults... more
Poster 266	GMP	From VS30 to near-surface velocity profiles: Integrating soft sediments in SCEC's UCVM Domniki Asimaki, Jian Shi, Ricardo Taborda The near-surface soil layers of sedimentary basins play a critical role in modifying the amplitude, frequency and duration of earthquake ground shaking. These phenomena, referred to as site effects, play a very important role in ground-motion... more	16028, 16036
Poster 111	Geology	Imaging fault scarps and fault zone evolution near an oceanic transform fault using high-resolution bathymetry Curtis Baden, George Hilley, Samuel Johnstone, Robert Sare, Felipe Aron, Holly Young, Christopher Castillo, Lauren Shumaker, Johanna Nevitt, Tim McHargue, Charles Paull Oceanic transform faults play a fundamental role in plate tectonics by linking spreading ridge segments to each other. While ubiquitous, they produce far fewer large earthquakes than faults along other tectonic boundaries. We use high-resolution (1... more
Poster 350	CS	QuakeCoRE ground motion simulation computational workflow Sung Bae, Viktor Polak, Richard Clare, Brendon Bradley, Hoby Razafindrakoto We present the ground motion simulation computational workflow that has been developed and is currently in use by QuakeCoRE researchers. The amount of data and complexity of computation make the large-scale ground motion simulations practically... more
Poster 008	SDOT	Reconstruction Modeling of Topography and Lithosphere Dynamics using Western U.S. Strain History within the Pacific-North America Plate Boundary Zone Alireza Bahadori, Bill Holt, Lucy Flesch, Lijun Liu, Troy Rasbury, Gavin Piccione, Rubin Smith The complex deformation history of the western U.S. since 36 Ma involved a dramatic transition from a subduction-dominated to a transform-dominated margin, with widespread extension within the interior Basin and Range region. This deformation... more
Poster 208	Seismology	Mitigating the spatial biases of back-projection imaging using a “station-based” slowness calibration Han Bao, Lingsen Meng, Zhipeng Liu The back projection (BP) approach has been widely used for earthquake source analysis, especially for imaging the complexity of the dynamic rupture of recent megathrust earthquakes. However, in the previous studies of several large earthquakes, such... more
Poster 164	Geodesy	InSAR MSBAS Time-Series Analysis of Induced Seismicity in Cushing, Oklahoma Magali Barba, Kristy Tiampo Since 2009, the number of earthquakes in the central and eastern United States has dramatically increased from an average of 24 M ≥ 3 earthquakes a year (1973-2008) to an average of 193 M ≥ 3 earthquakes a year (2009-2014) (Ellsworth, 2013).... more
Poster 032	FARM	Dynamic Weakening of Sliding Friction and the Influence of Gouge Development Monica Barbery, Frederick Chester, Judith Chester, Omid Saber Previous experiments demonstrate that as sliding velocity approaches seismic slip rates, the coefficient of sliding friction (u) typically reduces significantly and may reflect flash heating of surface contacts. Experiments further demonstrate... more
Poster 278	GMP	Ground Strains in Southern California from Earthquakes on the San Jacinto Fault Andrew Barbour, Annemarie Baltay Strainmeters record high-frequency seismic waves with signal-to-noise ratios that can be comparable to those of traditional seismometers, for average phase dispersion characteristics in Southern California. Yet, to date, the efficacy of using... more
Poster 133	Geodesy	High-Resolution Topographic Mapping of Active Faults in Southern California with Satellite Optical Imagery William Barnhart, Michael Willis, Terryl Bandy, Rich Briggs, Brianna Morales, Mark Faney Digital elevation models (DEMs) provide a core data set for many studies of active tectonics. They allow for the identification and quantification of fault offsets, modeling of localized and regional fluvial responses to vertical and lateral fault... more	16147
Poster 292	GMSV	Inter-Period Correlations of SCEC Broadband Platform Fourier Amplitudes and Response Spectra Jeff Bayless, Paul Somerville, Andreas Skarlatoudis, Fabio Silva, Norman Abrahamson A principal intent of the SCEC BBP is for simulated time series to be applied directly in engineering applications. To do so, the inter-period correlations of epsilon need to be appropriate, since these correlations are related to the width of peaks... more	16021
Poster 346	CS	PH5 for integrating and archiving different data types Bruce Beaudoin, Derick Hess, Steve Azevedo PH5 is IRIS PASSCAL's file organization of HDF5 used for seismic data. The extensibility and portability of HDF5 allows the PH5 format to evolve and operate on a variety of platforms and interfaces. To make PH5 even more flexible, the seismic... more
Poster 029	FARM	Earthquake source complexity? Near-fault velocity spectra from laboratory failures and their relation to natural ground motion N. Beeler, Brian Kilgore, David Lockner Natural earthquake sources have characteristic spectra, for example at high frequency the displacement amplitude spectrum of a body wave depends on frequency as 1 / f^2 [e.g., Hanks and Wyss, 1972] and velocity amplitude as 1/f. Such natural... more
Poster 333	CEO	2016 SCEC Undergraduate Studies in Earthquake Information Technology (USEIT): Loss Analysis of Earthquake Sequences Sophia Belvoir, Vianca Severino Rivas, Jenepher Zamora, Jadson da Silva Lima, Luis Gomez, Jozi Pearson, Mark Benthien, Thomas Jordan The 2016 Undergraduate Studies in Earthquake Information Technology (USE-IT) intern research program challenged the Hazard and Risk Visualization Team to illustrate threatening and probable multi-event earthquake scenarios in California using... more
Poster 185	Seismology	Internal structure of the San Jacinto fault zone at Blackburn Canyon from a dense linear deployment across the fault Yehuda Ben-Zion, Pieter-Ewald Share, Amir Allam, Fan-Chi Lin, Frank Vernon We image the internal structure of the Clark section of the San Jacinto fault zone (SJFZ) at Blackburn Canyon using teleseismic and local earthquake waveforms recorded during about 1 month by a linear array consisting of 125 three-component 5 Hz... more
Poster 311	EFP	Sedimentation in Nearshore Basins as Related to Paleoseismicity Will Berelson, Alex Sessions, Josh West, James Dolan The exceptional preservation and accumulation of Santa Barbara Basin (SBB) laminae has been exploited by a trove of scientists (Huselmann and Emery; Kolpack and Gorsline; Soutar; Fleischer; Thornton; Drake; Schimmelmann et al.; Kennett et al.; Behl... more	14238
Poster 199	Seismology	Rayleigh-wave ellipticity obtained from noise cross-correlations across southern California Elizabeth Berg, Fan-Chi Lin, Amir Allam We analyze Rayleigh wave ellipticity, or Rayleigh wave H/V (horizontal to vertical) amplitude ratios, computed from multi-component ambient noise cross-correlations using over 300 stations throughout Southern California in 2015. Because Rayleigh... more
Poster 060	FARM	Sensitivity of deformation to activity along the Mill Creek strand of the San Andreas fault within the San Gorgonio Pass Jennifer Beyer, Michele Cooke A significant portion of the deformation budget across irregular fault networks can be accommodated by permanent off-fault deformation that accumulates between earthquakes. This deformation may correspond to a reduction in the slip rates along the... more	16187
Poster 297	GMSV	Performance-Based Fault Displacement Estimation With Uniform California Earthquake Rupture Forecast 3 Probabilities Glenn Biasi We are implementing a performance-based engineering approach for probabilistic fault displacement hazard analysis (PFDHA) that builds on the third Uniform California Earthquake Rupture Forecast (UCERF3). UCERF3 developed probabilities of surface... more	16224
Poster 135	Geodesy	Seventy-two years of Surface Creep on the North Anatolian fault at Ismetpasa: Implications for the southern San Andreas and Hayward faults Roger Bilham, Haluk Ozener, David Mencin, Asli Dogru, Semih Ergintav, Ziyadin Cakir, Alkut Aytun, Bahadir Aktug, Onur Yilmaz, Wade Johnson, Glen Mattioli Surface creep on the North Anatolian fault was first recognized in 1969 in the form of an offset wall that had been constructed across the fault 13 years after the 1944 Mw=7.4 Bolu/Gerede earthquake. Publications by Ambraseys (1970) and Aytun (1982... more
Poster 009	SDOT	A new way to estimate shear tractions on active faults in southern California Peter Bird Two kinds of thin-shell finite-element (F-E) model of quasi-static neotectonics are available for southern California: (1) kinematic (or “inverse”) F-E models which fit geodetic and geologic data by weighted least-squares but contain limited physics... more	16048
Poster 070	FARM	How does fault geometry control earthquake magnitude? Quentin Bletery, Amanda Thomas, Leif Karlstrom, Alan Rempel, Anthony Sladen, Louis De Barros Recent large megathrust earthquakes, such as the Mw9.3 Sumatra-Andaman earthquake in 2004 and the Mw9.0 Tohoku-Oki earthquake in 2011, astonished the scientific community. The first event occurred in a relatively low-convergence-rate subduction zone... more
Poster 109	Geology	Assessing evidence for connectivity between the San Diego Trough and San Pedro Basin fault systems, offshore Southern California. Jayne Bormann, Graham Kent, Neal Driscoll, Alistair Harding The seismic hazard posed by offshore faults for coastal communities in Southern California is poorly understood and may be considerable, especially when these communities are located near long faults that have the ability to produce large... more
Poster 290	GMSV	Validation of ground-motion simulations using precarious rocks Elliot Bowie, Mark Stirling, Chris Van Houtte Validation of ground-motion simulations using precarious rocks Elliot Bowie, Mark Stirling & Chris Van Houtte We develop ground motion simulations for a major reverse fault in central Otago, New Zealand, and use ancient precariously-balanced... more
Poster 110	Geology	Multi-scale Structural Characterization of the Mecca Hills Fault System in the NE block of the Southern San Andreas Fault System, California Kelly Bradbury, Amy Moser, Sarah Schulthies, James Evans We examine the structural architecture, mineralogy, and alteration of fault zones across a range of scales in the Mecca Hills in southern California. Our research group is focusing on outcrop-scale field and laboratory measurements of 4 well-exposed... more
Poster 296	GMSV	Guidance on the utilization of ground motion simulations in engineering practice Brendon Bradley, Didier Pettinga, Jack Baker This poster provides an update on current progress to develop guidance on the utilization of ground motion simulations in engineering practice. A summary is provided of the key ingredients of ground motion simulations and the critical role of... more	16012
Poster 342	CS	Recent Advances of the ADER-DG Finite Element Method for Seismic Simulations Alexander Breuer, Alexander Heinecke, Yifeng Cui In this poster we present a novel local time stepping (LTS) scheme for ADER-DG finite element method and a holistic optimization targeting seismic simulations on the Intel Xeon Phi x200 processor, codenamed Knights Landing (KNL). The ADER-DG... more	16247
Poster 280	GMP	Higher Earthquake Intensity Attenuation Rates in the Urbanized Southern Puget Lowland Than Elsewhere Along the Cascadia Forearc Thomas Brocher The attenuation of seismic intensity with distance for 15 magnitude M4.8 to M6.8 earthquakes between 1949 and 2015 shows significant variation along the Cascadia forearc. Felt intensities for these earthquakes were taken from NOAA’s U.S. Earthquake... more
Poster 037	FARM	The Action of water films at Å-Scales in the Earth: Implications for Midcrustal Eathquakes and Overpressuring Kevin Brown, Dean Poeppe, IODP Leg 348 Shipboard Party Water properties change with confinement within nanofilms trapped between natural charged clay particles. We investigated nanofilm characteristics utilizing sediments from deep drilling of the Nankai subduction zone at Site C0002 of the Integrated... more
Poster 161	Geodesy	Using deformation rates in Northern Cascadia to constrain time-dependent stress- and slip-rate on the megathrust Lucile Bruhat, Paul Segall In northern Cascadia, estimates of interseismic slip deficit on the megathrust are complicated by the poorly understood “gap” between the down-dip limit of the locked region and the top of the Episodic Tremor and Slip (ETS) zone, as revealed by... more
Poster 291	GMSV	Toppling of PBRs Exposed to Ground Motions Estimated from the Composite Source Model of Earthquakes Richard Brune, John Anderson, Glenn Biasi, James Brune We have improved the description and documentation of precariously balanced rocks (PBRs) at Lovejoy Buttes 15 km NE of the San Andreas fault at the western edge of the Mojave Desert, and at sites within 20 km of the San Jacinto fault near the trans-... more
Poster 099	Geology	Testing for slip rate changes on the Sierra Madre fault: Progress on dating an offset terrace surface of possible middle Pleistocene age Reed Burgette, Nathaniel Lifton, Katherine Scharer, Devin McPhillips, Austin Hanson The Sierra Madre fault (SMF) system juxtaposes the San Gabriel Mountains against a series of basins along the northern margin of the Los Angeles metropolitan area. Previous studies have suggested that deformation rates on this fault vary spatially... more	16066
Poster 334	CEO	2016 SCEC Undergraduate Studies in Earthquake Information Technology (USEIT): Documentary and Virtual Reality Game Geneva Burkhardt, Aadit Doshi, Emily Olmos, Emma Huibregtse, Drew Welch, Mark Romano, Jason Ballmann, Jozi Pearson, Mark Benthien As a liaison between scientists and the public, the Media Team translates complex concepts into accessible information. Its documentary explains concepts which fellow interns have researched and developed, illustrates the program’s impact on... more
Poster 268	GMP	Using Simulated Ground Motions to Constrain Near-Source Ground Motion Prediction Equations in Areas Experiencing Induced Seismicity Samuel Bydlon, Eric Dunham Recent increases in seismic activity in historically quiescent areas such as Oklahoma, Texas, and Arkansas, including large, potentially induced events such as the 2011 Mw 5.6 Prague, OK, earthquake, have spurred the need for investigation into... more
Poster 337	CME	CyberShake Advancements: Broadband Seismograms and Central California Sites Scott Callaghan, Philip Maechling, Christine Goulet, Karan Vahi, Robert Graves, Kim Olsen, Kevin Milner, David Gill, Yifeng Cui, Thomas Jordan The CyberShake computational platform, developed by SCEC, is an integrated collection of scientific software and middleware that performs 3D physics-based probabilistic seismic hazard analysis (PSHA). CyberShake integrates large-scale parallel and... more
Poster 039	FARM	Dynamic friction in sheared fault gouge: implications of acoustic vibration on triggering and slow slip Jean Carlson, Charles Lieou, Ahmed Elbanna Friction and deformation in granular fault gouge are among various dynamic interactions associated with seismic phenomena that have important implications for slip mechanisms on earthquake faults. To this end, we propose a mechanistic model of... more	16135
Poster 027	FARM	Slip and Seismic Radiation Along Bi-material Faults: An Experimental Analysis Brett Carpenter, Ximeng Zu, Xiaowei Chen, Ze'ev Reches Large displacements along faults frequently juxtapose crustal blocks of different compositions and mechanical properties. Such juxtapositions have been termed bi-material faults (BFs). It has been theoretically shown that a BF setting may strongly... more
Poster 257	Seismology	Fault-Zone Exploration in Highly Urbanized Settings Using Guided Waves: An Example From the Raymond Fault, Los Angeles, California Rufus Catchings, Janis Hernandez, Robert Sickler, Mark Goldman, Joanne Chan, Coyn Criley Locating faults in the near-surface beneath highly urbanized settings is challenging because urbanization obscures geomorphic evidence of the faults in relatively short time periods. Yet, urban faults can represent major hazards because they... more
Poster 044	FARM	Earthquake cycles on rate-state faults: how does recurrence interval and its variability depend on fault length? Camilla Cattania, Paul Segall The concept of earthquake cycles consisting of periodic events on the same patch is often invoked or assumed when discussing seismic risk. However, large faults exhibit more complex behavior than periodic stick-slip cycles. Some events, such as the... more	16248

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