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 305

SCEC ID	Category	Title and Authors	SCEC Award
Poster 096	Geodesy	Seismogenic structure and coseismic slip distribution of the 2013 Ms7.0 Lushan earthquake in southwestern China Qi Liu, Xueze Wen, Zhigang Shao To further understand the tectonic process of the Lushan MS7.0 earthquake, which occurred in southwestern China on April 20, 2013, a 3D fault geometry model was built by integrating the relocated aftershocks distribution and the information of... more
Poster 035	Seismology	Separating non-diffuse component from ambient seismic noise cross-correlation in southern California Xin Liu, Gregory Beroza, Nori Nakata Cross-correlation of fully diffuse wavefields provides Green’s function between receivers, although the ambient noise field in the real world contains both diffuse and non-diffuse fields. The non-diffuse field potentially degrades the correlation... more
Poster 104	Geodesy	Integration of InSAR and GPS data for 3-dimensional crustal deformation mapping Zhen Liu, Zheng-Kang Shen, Cunren Liang, Paul Lundgren GPS and InSAR are complementary to each other for crustal deformation mapping, with the former offering discrete high-fidelity 3-dimensional (3-D) point positioning while the latter providing 2-D dense spatial coverage of deformation measured along... more
Poster 004	EFP	Space-time earthquake rate models for one-year hazard forecasts in Oklahoma Andrea Llenos, Andrew Michael The recent one-year seismic hazard assessments for natural and induced seismicity in the central and eastern US (CEUS) (Petersen et al., 2016, 2017) rely on earthquake rate models based on declustered catalogs (i.e., catalogs with foreshocks and... more
Poster 311	CEO	2017 UseIT: Probability Team Chi Loh, Olivia Dorencz, Aide Escanuela, Kevin Qualls, Kevin Milner, Thomas Jordan, Jozi Pearson, Gabriela Noriega California is a high seismic-hazard area due to several dangerous faults that run through the state, primarily the San Andreas Fault (SAF). The dense population near the SAF in cities such as Los Angeles and San Francisco makes this hazard a... more
Poster 107	Geodesy	InSAR coherence time series - soil moisture as a proxy for alluvial fan age? Rowena Lohman, Chelsea Scott, Teresa Jordan When scientists can determine the ages of surfaces within a tectonically active area, they can turn observations of offsets and deformation into rates, repeat times and evaluations of hazard. Here, we explore the use of InSAR coherence time series... more
Poster 257	GM	Ground-Motion Variance from Modeling of Multiple Rupture-Directivity Scenarios on the Newport-Inglewood/Rose Canyon Fault System John Louie, Mounira Boudjema, Michelle Dunn, Graham Kent We use LLNL’s SW4 wave-propagation modeler to produce shaking maps and synthetic seismograms for hypothetical, nonetheless geologically plausible earthquake ruptures of the Newport Inglewood Rose Canyon (NI/RC) fault system along the Southern... more
Poster 158	SAFS	Rupture propagation through the Big Bend of the San Andreas Fault: a dynamic modeling case study of the Great Earthquake of 1857 Julian Lozos The great San Andreas Fault (SAF) earthquake of 9 January 1857, estimated at M7.9, was one of California’s largest historic earthquakes. Its ~360 km rupture trace follows the Carrizo and Mojave segments of the SAF, including the ~30° compressional... more
Talk Tue 10:40	SAFS	Introducing the Cajon Pass Earthquake Gate Area Julian Lozos, Craig Nicholson, Nate Onderdonk Cajon Pass is the primary junction between the San Andreas (SAF) and San Jacinto (SJF) faults. Its location in western San Bernardino County – in the middle of the densely populated Inland Empire – means that even a local rupture within the Pass... more
Poster 002	EFP	Natural Time and Nowcasting Induced Seismicity at the Groningen Gas Field in the Netherlands Molly Luginbuhl, Donald Turcotte, John Rundle The area surrounding the Groningen natural gas field in the Netherlands has recently seen a significant increase in seismicity. How to handle this induced seismicity has become a controversial topic for many. The gas field provides energy for the... more
Poster 184	FARM	Dynamics of Non-planar Thrust Faults Governed by Various Friction Laws Bin Luo, Benchun Duan Fault interface topography is a prevailing factor in earthquake rupture dynamics. In subduction zones, large-scale oceanic reliefs such as seamounts and plateaus on the incoming oceanic plate can be subducted with the downgoing plate, giving rise to... more
Poster 208	SDOT	Borehole Breakouts Versus Earthquake Focal Mechanisms as Stress Field Orientation Indicators in Southern California: Should We Agree to Disagree? Karen Luttrell, Jeanne Hardebeck One of the SCEC5 priorities is the development of an internally consistent group of Community Models (CXM), including the maturation of the Community Stress Model (CSM). Many of the geodynamic models that integrate multiple physical processes into... more	17174
Poster 260	GM	Taiwan Earthquake Model: PSHA and Scenario Hazard Map Kuo-Fong Ma, Taiwan Earthquake Model (TEM) team Taiwan Earthquake Model (TEM) using GEM OpenQuake engine for the assessment of seismic hazards of Taiwan. The first version of TEM probabilistic seismic hazard analysis for Taiwan was published in 2015 (TEM PSHA2015, Wang et al., 2016a). The model... more
Poster 180	FARM	Stick Slip Instabilities and Strain Localization Dynamics in a fluid-infiltrated fault gouge zone model Xiao Ma, Ahmed Elbanna Stick-slip instabilities and shear localization have been long observed in sheared fault gouge, yet their underlying microscopic mechanisms are still not fully understood. Although numerous studies of the stick slip behavior within fault gouge have... more
Poster 302	CME	Current Capabilities of the SCEC Unified Community Velocity Model (UCVM) Software Framework Philip Maechling, Ricardo Taborda, Kim Olsen, Scott Callaghan, Thomas Jordan, Christine Goulet The Southern California Earthquake Center (SCEC) has developed the Unified Community Velocity Model (UCVM) software framework to facilitate the registration and distribution of existing and future seismic velocity models to the SCEC community. The... more
Poster 268	GM	Cluster analysis of the long-period ground-motion simulation data – application of the Nankai Trough megathrust earthquakes scenarios Takahiro Maeda, Hiroyuki Fujiwara, Toshihiko Hayakawa, Satsuki Shimono, Sho Akagi Extracting important hazard information and its trends from the big data leads to better risk assessment and quick respond in case of emergency when megathrust earthquake happens. A cluster analysis was applied to the big data of the long-period... more
Talk Mon 14:00	EFP	Progresses and challenges for Operational Earthquake Forecasting in Italy Warner Marzocchi Tracking the time evolution of seismic hazard in time windows shorter than the usual 50-years of long-term hazard models may offer additional opportunities to reduce the seismic risk. This is the target of operational earthquake forecasting (OEF) as... more
Poster 216	SDOT	Measuring Aseismic Slip through Characteristically Repeating Earthquakes at the Mendocino Triple Junction Kathryn Materna, Taka'aki Taira, Roland Bürgmann The Mendocino Triple Junction (MTJ) is located at the seismically active transition between the San Andreas fault system, the Mendocino Transform Fault, and the Cascadia Subduction Zone. Most of the major faults of the triple junction are located... more
Talk Wed 11:00	EEII	Post-Earthquake Reconnaissance: a Structural Engineer’s Perspective Silvia Mazzoni Post-Earthquake Reconnaissance gives a first-hand opportunity to observe the effects of an earthquake on a human scale. During a reconnaissance, we gather data and knowledge, as well as an understanding and appreciation of the interdependencies... more
Poster 109	Geology	Examining earthquake processes with microtextural analysis and (U-Th)/He thermochronometry: a case study from hematite fault mirrors in the Wasatch fault zone Robert McDermott, Alexis Ault, James Evans Advances in physically based models of earthquake rupture place an increasing importance on characterization of the physical processes that control dynamic friction in natural faults. We apply coupled textural analysis and hematite (U-Th)/He (He)... more
Poster 161	SAFS	Puzzling results in a slip rate study for the Banning Strand of the San Andreas Fault near North Palm Springs Sally McGill, Paula Figueiredo, Lewis Owen To better understand the likely rupture paths and slip distribution on the southern San Andreas Fault, additional slip rate measurements are needed from the Mission Creek, Banning and Garnet Hill fault strands in northern Coachella Valley. We... more	15182
Poster 052	Seismology	Directly Estimating Rupture Area to Remove the Uncertainty in Stress Drop Jeff McGuire, Yoshihiro Kaneko The key kinematic earthquake source parameters: rupture velocity, duration and area, shed light on earthquake dynamics. They can provide direct constraints on stress drop and have implications for seismic hazard. However, for moderate and small... more	16104
Poster 160	SAFS	Assessing stratigraphic correlations and fault zone extent at the 18th Ave trench site, Banning strand of the San Andreas Fault, North Palm Springs, California James McNeil, Doug Yule, Katherine Scharer, Sally McGill, Devin McPhillips, Bryan Castillo, Alan Pace A trench opened in March, 2017 by Petra Geoscience, Inc., provided a valuable opportunity to examine the previously unconstrained earthquake record of Banning strand of the San Andreas Fault (also see Castillo et al., this meeting). The initial... more	15182
Poster 122	Geology	Sources and Magnitudes of Uncertainty in Fault Slip Rate, Cucamonga Thrust Fault, Southern California Devin McPhillips, Katherine Scharer Maps of historic earthquake ground surface ruptures show that displacements along strike are spatially variable. As a result, latest Quaternary slip rates developed from a small number of displacement measurements may not accurately represent fault... more
Poster 063	Seismology	What does an 'average' large subduction earthquake look like? Men-Andrin Meier, Jean-Paul Ampuero, Thomas Heaton When we study individual earthquakes we often notice and report 'peculiarities', or unexpected rupture behavior. This implies that there is a 'normal' or average earthquake behavior from which such events deviate. From an... more
Poster 060	Seismology	Reconciling Fault Geometry in Nepal Himalaya using the “NAMASTE” Seismic Network Manuel Mendoza, Abhijit Ghosh, Marianne Karplus, John Nabelek, Soma Sapkota, Lok Adhikari, Simon Klemperer, Aaron Velasco The Mw 7.8 Gorkha earthquake in April of 2015 produced ~8 m of peak co-seismic slip as the Main Himalayan Thrust (MHT) fault ruptured 130 km east, under dense population centers such as Kathmandu. The mainshock and subsequent aftershocks killed over... more
Poster 053	Seismology	Towards quasi-automated estimates of directivity and related source properties of small to moderate earthquakes with second seismic moments Haoran Meng, Yehuda Ben-Zion, Jeff McGuire We develop a method for quasi-automated estimation of directivity, rupture area, duration, and centroid velocity of earthquakes with second seismic moments. The method is applied to small to moderate earthquakes in southern California. P and S phase... more	17177
Poster 256	GM	Improving Distance Metrics in Ground Motion Prediction Equations Based with Seismic Array Back-Projections Lingsen Meng, Tian Feng Traditional Ground Motion Prediction Equations (GMPEs) measure the distances either relative to the epicenter (Repi) or the hypocenter (Rhyp) assuming point-sources, or relative to the closest point of the fault rupture (Rrup) or its surface... more
Poster 183	FARM	Pulse-Like Partial Ruptures and High-Frequency Radiation at Creeping-Locked Transition during Megathrust Earthquakes Sylvain Michel, Jean-Philippe Avouac, Nadia Lapusta, Junle Jiang Megathrust earthquakes tend to be confined to fault areas locked in the interseismic period and often rupture them only partially. For example, during the 2015 M7.8 Gorkha earthquake, Nepal, a slip pulse propagating along strike unzipped the bottom... more
Poster 100	Geodesy	Capturing Postseismic Processes of the 2016 Mw 7.1 Kumamoto Earthquake, Japan, Using Dense, Continuous GPS and Short-repeat Time ALOS-2 InSAR Data: Implications for the Shallow Slip Deficit Problem Chris Milliner, Roland Bürgmann, Teng Wang, Asaf Inbal, David Bekaert, Cunren Liang, Eric Fielding Separating the contribution of shallow coseismic slip from rapidly decaying, postseismic afterslip in surface rupturing events has been difficult to resolve due to the typically sparse configuration of GPS networks and long-repeat time of InSAR... more
Poster 012	EFP	Are Physics-Based Simulators Ready for Prime Time? Comparisons of RSQSim with UCERF3 and Observations Kevin Milner, Bruce Shaw, Jacquelyn Gilchrist, Thomas Jordan Probabilistic seismic hazard analysis (PSHA) is typically performed by combining an earthquake rupture forecast (ERF) with a set of empirical ground motion prediction equations (GMPEs). ERFs have typically relied on observed fault slip rates and... more	16273
Talk Wed 08:30	Seismology	The Limits of Earthquake Early Warning Sarah Minson, Annemarie Baltay, Elizabeth Cochran, Thomas Hanks, Men-Andrin Meier The objective of earthquake early warning (EEW) is to provide population centers with a useful warning of impending strong ground shaking: the warning must be sufficiently rapid and accurate for users to take action to mitigate damage. By... more
Poster 197	FARM	Grain boundary sliding triggers coeval pseudotachylyte development in brittle-ductile transition mylonites: an Electron Backscatter Diffraction (EBSD) case study of mid-crustal interseismic and coseismic deformation Elena Miranda, Craig Stewart, Kelly Lourcey Exposures of coeval pseudotachylytes and mylonites are relatively rare, but are crucial for understanding the seismic cycle in the vicinity of the brittle-ductile transition (BDT). We use both field observations and electron backscatter diffraction... more	17063
Poster 148	Geology	Lidar data, geologic mapping, and paleoseismic trenching reveal late Quaternary surface ruptures and increased seismic hazard in southwestern British Columbia, Canada Kristin Morell, Christine Regalla, Colin Amos, Scott Bennett, Audrey Graham, Lucinda Leonard, Emerson Lynch, Nicolas Harrichhausen Lidar topography, structural-geomorphic mapping, and paleoseismic trenching reveal new evidence for late Quaternary activity on three faults on Vancouver Island, British Columbia, that were previously thought to be inactive since the Eocene. Two... more
Poster 236	EEII	Using Spatial Variation of kappa to Develop Site-Specific Attenuation Model for Improved Broadband Simulations Ramin Motamed, Swasti Saxena, John Anderson Reliable synthetics are an alternative for use in engineering practice for dynamic time history analysis of geotechnical and structural systems, and this study aims to improve upon Broadband simulations to account for site-specific surface response... more	16165
Poster 003	EFP	Towards Testing Probabilistic Seismic Hazard Estimates Mostafa Mousavi, Gregory Beroza Hazard curves in PSHA models are used for quantifying the seismic hazards by providing the annual rates of exceedance, the reciprocal of the return period, at various ground-motion levels. Beginning in 2016, the U.S. Geological Survey (USGS) started... more
Poster 276	CS	Manage I/O Task in a Normalized Cross-Correlation Earthquake Detection Code for Large Seismic Datasets Dawei Mu, Pietro Cicotti, Yifeng Cui We have developed a high-performance GPU-based software called “cuda Normalized Cross-Correlation” (cuNCC), for calculating seismic waveform similarity for subjects like hypocenter estimates and small earthquake detection. We present the performance... more
Poster 222	SDOT	Revised (lower) slip rate for the Northern Death Valley Fault based on a new method for restoring alluvial fan cutoff lines Karl Mueller, Ragan Anthony Determining slip rates on active strike slip faults in Southern California at timescales of 103 – 105 years depends on recognition and measurement of offset landforms and deposits. While offset deposits can be directly age dated to determine slip... more
Poster 090	Geodesy	The impact of model prediction error in designing geodetic networks for crustal deformation applications Jessica Murray Earth surface displacements measured at Global Navigation Satellite System (GNSS) sites record crustal deformation due, for example, to slip on faults underground. A primary objective in designing geodetic networks to study crustal deformation is... more
Poster 210	SDOT	InSAR and GPS time series analysis in areas with large scale hydrological deformation: separating signal from noise at varying length scales in the San Joaquin Valley Kyle Murray, Rowena Lohman Areas of large-scale subsidence are observed over much of the San Joaquin Valley of California due to the extraction of groundwater and hydrocarbons from the subsurface.These signals span regions with spatial extents of up to 100 km and have rates... more
Poster 022	SP	Towards a High-Resolution Velocity Model with a Very Dense Array at Diablo Canyon, California Nori Nakata, Gregory Beroza Correlation-based analyses of ambient seismic wavefields is a powerful tool for retrieving subsurface information such as stiffness, anisotropy, and heterogeneity at a variety of scales. Especially with very dense arrays recently used for... more
Poster 234	CXM	Community Fault Model Version 5.2: Updating & expanding the CFM 3D fault set and its associated fault database Craig Nicholson, Andreas Plesch, John Shaw We present an updated version of the SCEC Community Fault Model (CFM) for southern California. For version 5.2, we continue to focus on expanding and improving the database component of CFM that is critical for the internal consistency and... more	17027, 17066
Poster 249	GM	Fourth-Order Staggered-Grid Finite-Difference Seismic Wavefield Estimation Using a Discontinuous Mesh Interface (WEDMI) Shiying Nie, Daniel Roten, Kim Olsen, Steven Day In a realistic geological structure with a large contrast in seismic wave speed between shallow and deep regions, simulation of seismic wave propagation using a spatially uniform grid can be computationally very demanding, due to overdiscretization... more
Poster 083	Seismology	How NSHMP 2014 and UCERF3 have changed the earthquake risk landscape in the US Marleen Nyst, Delphine Fitzenz, Nilesh Shome Early 2017 RMS released an updated North America Earthquake Model to the insurance market with risk models for the US, Canada and Mexico. Here we will focus on California, the Pacific Northwest (PNW) and New Madrid. This new model has updates for... more
Poster 006	EFP	On secular spatial seismicity Yosihiko Ogata It has been passed 15 years since the hierarchical (i.e., location-dependent) space-time ETAS (HIST-ETAS) models have been proposed (Ogata et al., 2003); and the short-term (daily) and intermediate-term (3-months and one year) earthquake forecasts... more
Poster 124	Geology	Strath terraces in the Santa Ynez Valley suggest late Quaternary activity on a detachment fault beneath the Western Transverse Ranges, California Nate Onderdonk, Andrew Farris, Edward Tyler, Ani Pytlewski, Antonio Garcia, Shannon Mahan High rates of shortening across the western Transverse Ranges (WTR) have been interpreted from geodetic, geologic, and geomorphic data. Studies of active deformation of the WTR have been focused on structures along the Ventura-Santa Barbara coast.... more
Poster 114	Geology	The rock record of seimic nucleation: a case study from the Whipple Mountains Detachment Fault, eastern California Daniel Ortega-Arroyo, Whitney Behr, Emilie Gentry Despite advances in our understanding of the physics of earthquakes, the mechanisms by which dynamic rupture nucleates in the middle crust remains enigmatic. Proposed mechanisms include flash heating of asperities, thermal pressurization of pore... more
Poster 232	CXM	Toward a Geologic Framework for the Community Rheology Model, with focus on the Mojave region Michael Oskin, Whitney Behr, Alex Morelan, Andreas Plesch, John Shaw Strain accrues heterogeneously across southern California due to the interaction of plate-boundary driving forces with lithospheric structure. To understand this process, we undertake the construction of a geologic framework for the Community... more
Poster 017	EFP	Characterizing the Triggering Susceptibility of Characteristic Faults Morgan Page, Nicholas van der Elst, Bruce Shaw Statistical averages of earthquake triggering behavior, namely Gutenberg-Richter magnitude scaling, can produce foreshock probabilities that differ by orders of magnitude from fault-specific methods that employ characteristic magnitude distributions... more
Poster 147	Geology	Paleoseismic Record of Three Holocene Earthquakes Rupturing the Issyk-Ata Fault near Bishkek, North Kyrgyzstan Magda Patyniak, Angela Landgraf, Atyrgul Dzhumabaeva, Kanatbek Abdrakhmatov, Swenja Rosenwinkel, Oliver Korup, Frank Preusser, Jens Fohlmeister, Ramon Arrowsmith, Manfred Strecker The evaluation of thrust paleoearthquakes and associated fault scarps is often hampered by the size of their cumulative fault scarps and interaction with sedimentary processes during interseismic periods. This is especially true if these events... more

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