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 201-250 of 355

SCEC ID	Category	Title and Authors	SCEC Award
Poster 248	Seismology	Dynamic Triggering and fault geometry in the Central Himalaya Seismic Gap Manuel Mendoza, Abhijit Ghosh, S Rai The devastating Mw 7.8 Gorkha earthquake in Nepal on 25 April 2015, reawakened attention to the high earthquake risk along the Himalayan arc. As a result of the Gorkha event, it is important to identify where stresses are building up along and near... more
Poster 229	Seismology	Towards automated estimates of directivity and related source properties of small to moderate earthquakes in Southern California with second seismic moments Haoran Meng, Yehuda Ben-Zion, Jeff McGuire We develop a method for automated estimation of directivity, rupture area, duration, and centroid velocity of earthquakes in Southern California with second seismic moments. A 1D ray tracing and an automated picking algorithm are combined to give... more	16104
Poster 108	Geology	Geometric, kinematic, and temporal patterns of Quaternary surface rupture on the Eastern Pinto Mountain fault zone near Twentynine Palms, southern California Christopher Menges, Jonathan Matti, Stephanie Dudash Detailed geologic mapping along the eastern Pinto Mountain fault zone (PMfz) in the Twentynine Palms area reveals previously unrecognized time-space variations in internal geometry, kinematics, and Quaternary surface-rupture timing; these variations... more
Poster 305	EFP	Seismic and Aseismic Moment Budget and Implication for the Seismic Potential of the Parkield Segment of the San Andreas Fault Sylvain Michel, Jean-Philippe Avouac, Romain Jolivet, Lifeng Wang This study explores methods to assess the seismic potential of a fault based on geodetic measurements, geological information of fault slip rate and seismicity data. The methods are applied to the Parkfield's section along the San Andreas Fault... more
Poster 088	Geology	Aerial2lidar3d: A New Point Cloud-Optical Image Matching Technique to Quantify Near-Field, Surface Co-Seismic Deformation in 3D: Application to the 1999 Mw 7.1 Hector Mine Earthquake and New Surface Offset Measurements of the 1999 Mw 7.6 Izmit earthquake Chris Milliner, James Dolan, Robert Zinke, James Hollingsworth, Sebastien Leprince, Francois Ayoub Measurements of co-seismic surface deformation of large magnitude earthquakes are of critical importance for the characterization of distributed deformation and understanding fault zone mechanics. Recent developments in geodetic matching techniques... more	15194
Poster 335	CEO	SCEC-VDO Reborn: A New 3-Dimensional Visualization and Movie Making Software for Earth Science Data Kevin Milner, FNU Sanskriti, John Yu, Scott Callaghan, Philip Maechling, Thomas Jordan Researchers and undergraduate interns at the Southern California Earthquake Center (SCEC) have created a new 3-dimensional (3D) visualization software tool called SCEC Virtual Display of Objects (SCEC-VDO). SCEC-VDO is written in Java and uses the... more
Poster 192	Seismology	Smartphone-Based Earthquake Early Warning in Chile Sarah Minson, Benjamin Brooks, Sergio Barrientos, Juan Carlos Baez, Maren Boese, Todd Ericksen, Christian Guillemot, Elizabeth Cochran, Jessica Murray, John Langbein, Craig Glennie, Christopher Duncan Chile faces a high seismic hazard with magnitude 7.5+ earthquakes occurring roughly every 1.5 years. Accordingly, Chile has a need for both earthquake early warning and local tsunami early warning. The Chilean Centro Sismológico Nacional (CSN) is... more
Poster 131	SoSAFE	Activity of the Mill Creek and Mission Creek strands of the San Andreas fault through the San Gorgonio Pass region Alex Morelan, Michael Oskin, Judith Chester, Daniel Elizondo We present new observations that constrain the recent slip history of the Mill Creek and Mission Creek strands of the San Andreas fault. These faults are the northern strands of a complex series of strike-slip and thrust faults through the San... more	15202
Poster 271	GMP	Ground motions from induced earthquakes in Oklahoma and Kansas: implications for seismic hazard Morgan Moschetti, Steven Rennolet, Eric Thompson, William Yeck, Dan McNamara, Robert Herrmann, Peter Powers, Susan Hoover Recent efforts to characterize the seismic hazard resulting from increased seismicity rates in Oklahoma and Kansas highlight the need for a regionalized ground motion characterization. To support these efforts, we measure and compile strong ground... more
Poster 281	GMSV	Incorporation of Local Site Effects in Broadband Simulations of Ground Motions: Case Study of the Wildlife Liquefaction Array Ramin Motamed, John Anderson The principal objective of this research is to explore the most efficient approach to incorporate local site effects in Broadband (BB) simulations of ground motions and include the nonlinear soil behavior in the overall response. In this research,... more	16165
Poster 053	FARM	Comparison of Source Inversions and Stress Drops with In-Situ Observations of Faulting Pamela Moyer, Margaret Boettcher, William Ellsworth A Mw 5.4 earthquake, which occurred on 5 August, 2014 beneath the Moab Khotsong gold mine, in Ornkey, South Africa provides a unique opportunity to directly compare seismological inferences with in-situ observations of faulting. The Mw 5.4... more
Poster 336	CS	AWP-ODC Open Source Project Dawei Mu, Alexander Breuer, Josh Tobin, Hui Zhou, Yifeng Cui AWP-ODC is widely used community software that simulates large-scale 3D seismic wave propagation in a viscoelastic medium. We have recently undertaken an open source release of AWP-ODC-OS for the first time. This open source effort is dedicated to... more
Poster 127	SoSAFE	Holocene geologic slip rate for the Mission Creek fault at the Three Palms site in the Indio Hills Juan Munoz, Whitney Behr, Warren Sharp, Rosemarie Fryer, Peter Gold Slip on the southern San Andreas fault in the northwestern Coachella Valley in Southern California is partitioned between three strands, the Mission Creek, Garnet Hill, and Banning strands. In the vicinity of the Indio Hills, the NW striking Mission... more	15142, 16057
Poster 154	Geodesy	Estimating secular velocities from GPS data contaminated by postseismic motion at sites with limited pre-earthquake data Jessica Murray, Jerry Svarc Constant secular velocities estimated from Global Positioning System (GPS)-derived position time series are a central input for modeling interseismic deformation in seismically active regions. Both postseismic motion and temporally correlated noise... more
Poster 277	GMP	Assessment of Predictive Values of Site Response based on GMPE approaches using a Large-N array Nori Nakata Ground-motion prediction is a key component for seismic hazard analysis, which is typically carried out with ground-motion prediction equations. The standard deviation of the best-fit model characterizes the residual ground motion variability.... more	16296
Poster 285	GMSV	Hybrid Broadband Ground motion simulations of Porters Pass fault earthquakes Mohammad Nazer, Hoby Razafindrakoto, Brendon Bradley We present ground motion simulations of the Porters Pass (PP) fault in the Canterbury region of New Zealand; a major active source near the Christchurch city. The active (slip rate 3.2-4.1 mm/yr) segment of the PP fault has an inferred length of 82... more
Poster 075	FARM	Effects of elastoplastic material properties on shallow fault slip and surface displacement fields Johanna Nevitt, Benjamin Brooks, Todd Ericksen, Craig Glennie, Christopher Madugo, David Lockner, Diane Moore, Sarah Minson, Kenneth Hudnut Inadequate knowledge of fault slip and off-fault deformation within the shallow crust (<1 km depth) limits our understanding of fundamental fault physics and seismic hazard associated with near-surface rupture. Recent technological advances in... more
Poster 206	Seismology	Evaluation of Site Response in the Los Angeles Basin from Spectral Ratio Analysis of Microtremor Data from a High Density Temporary Broadband Deployment Raymond Ng, Jascha Polet Sedimentary basins, such as the Los Angeles basin, can significantly amplify seismic ground motion and increase its duration, considerably increasing the potential for damage and loss in urban areas. Most site response studies in the Los Angeles... more
Poster 331	CEO	2016 SCEC Undergraduate Studies in Earthquake Information Technology (USEIT): Earthquake Magnitude & Event Probability Forecasting Daniel Ngu, Brady Guan, Mingyan Zhou, Yipeng Li, Jozi Pearson, Thomas Jordan, Kevin Milner, Mark Benthien The 2016 Undergraduate Studies in Earthquake Information Technology (USEIT) Probabilistic Forecasting Team created forecasts of large events (magnitude 7+ earthquakes) that will occur in the next week, month, year, and 10 years on the southern San... more
Poster 006	USR	Anomalous Uplift at Pitas Point: Implications from Onshore & Offshore 3D Fault & Fold Geometry and Observed Fault Slip Craig Nicholson, Christopher Sorlien, Tom Hopps Based on four Recent ~8-m uplift events of coastal marine terraces at Pitas Point, many believe these represent earthquakes near M8 on the N-dipping Pitas Point-Ventura fault (PPVF), part of the larger primarily offshore North Channel-Pitas Point-... more	16065
Poster 349	CS	Hybrid Genetic Deflated Newton Method for Distributed-Source Optimization Marcus Noack, Steven Day Earthquake fault parameter inversion is a promising field of research. An accurately defined source leads in turn to accurate ground motion predictions. The promising perspective comes at a cost; local and global optimization procedures like the... more
Poster 332	CEO	2016 SCEC Undergraduate Studies in Earthquake Information Technology (USEIT): SCEC-VDO Development & Visualization Rory Norman, Kishan Rajasekhar, Emy Huang, Patrick Vanderwall, Allen Shi, Rafael Cervantes, Mark Benthien, Thomas Jordan, FNU Sanskriti, Jozi Pearson, John Yu, Kevin Milner SCEC-VDO (Southern California Earthquake Center Virtual Display of Objects) is a software program which allows users to visualize different sets of earthquake data. SCEC-VDO is developed by interns in Undergraduate Studies in Earthquake Information... more
Poster 323	CEO	Beat the Quake: Designing an Earthquake Themed Puzzle Room Jenny Novak, Julian Lozos California State University, Northridge (CSUN) is one of the nation’s largest single-campus universities. The University is located in a dense, urban setting with a history of exposure to large earthquakes including the 1994 Northridge earthquake... more
Poster 320	Simulators	Provably stable and high-order accurate finite difference schemes on staggered grids and their potential application for seismic hazard analysis Ossian O'Reilly, Eric Dunham When it comes to wave propagation over large distances, high-order and centered finite difference approximations on staggered grids are highly effective. For this reason, the 4th order staggered grid scheme is used for many of SCEC’s high... more
Poster 056	FARM	A possible joint San Andreas-Imperial fault rupture in the Salton Trough region David Oglesby, Christodoulos Kyriakopoulos, Aron Meltzner, Thomas Rockwell We investigate the potential for large through-going ruptures across the Salton Trough using both field data and numerical simulations. Geological records from paleoseismic trenches inform us of details of past ruptures (length, magnitude, timing),... more	16231
Talk 9/13 08:30	Geology	Kumamoto earthquake: a complex earthquake sequence with large strike-slip ruptures Koji Okumura The Mw 7.3 mainshock of the Kumamoto earthquake on April 16 ruptured the Futagawa fault zone mostly as it was forecasted. However, the sequence of earthquakes, ruptures, and localized severe shaking were beyond the forecast demonstrating the... more
Poster 067	FARM	Rupture evolution and high-frequency radiation during mega/large earthquakes, resolved by hybrid backprojection technique Ryo Okuwaki, Yuji Yagi Tracking spatio-temporal evolution of high-frequency (HF) sources during rupture is a key to understand nature of earthquake rupture process since HF radiation reflects an abrupt change of rupture velocity and/or slip-rate. We have been developing... more
Poster 001	GMP	Next Generation SDSU BBP Module Validation Kim Olsen, Rumi Takedatsu The SDSU module (BBtoolbox V1.5), merging low-frequency deterministic signals with high-frequency scattering functions (Olsen and Takedatsu, 2015), participated in and passed the SCEC Broadband Platform validation exercise 1.0, where the focus was... more	16115
Poster 299	WGCEP	Testing ETAS Catalogs from UCERF3 Morgan Page, Nicholas van der Elst, Edward Field, Kevin Milner Epidemic-Type Aftershock Sequence (ETAS) catalogs generated from the 3rd Uniform California Earthquake Rupture Forecast (UCERF3) model are unique in that they represent a marriage between two types of earthquake forecast models that have never... more
Poster 138	Geodesy	Characterization of fault motions observed with UAVSAR. Jay Parker, Andrea Donnellan, Scott Hensley, Margaret Glasscoe Publically available data from the Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR), which measures deformation between repeat visits, provide an excellent opportunity for characterizing fault motions. These include the main shock fault... more
Poster 327	CEO	Developing the Next Generation SCEC Web Infrastructure Edric Pauk, David Gill, Tran Huynh, Mark Benthien, John Marquis, Jason Ballmann, John Yu, Philip Maechling The Southern California Earthquake Center's (SCEC) primary mission is to gather data on earthquakes, integrate that data into a physics-based understanding of earthquake phenomena, and communicate that understanding to the society-at-large. One... more
Poster 049	FARM	Linking grain-scale and fault-scale earthquake simulations Ryan Payne, Benchun Duan, David Sparks Geologically active faults are complex structures, marked by an interaction of many different physical processes at varying time and length scales. Much progress has been made utilizing advanced computer models as an effective way of studying the... more
Poster 114	Geology	Surface slip behavior of the southern and central Alpine fault, New Zealand Jozi Pearson, Nicolas Barth The Alpine Fault (AF) is a major continental plate boundary between the Australian and Pacific plates, linking oppositely-dipping subduction zones in New Zealand. Due to its relative geometric simplicity, high slip rate, and quasi-regular earthquake... more
Poster 347	CS	Performance enhancements and visualization for RSQSim earthquake simulator Dmitry Pekurovsky, Amit Chourasia, Keith Richards-Dinger, Bruce Shaw, James Dieterich, Yifeng Cui We report work in progress on RSQSim earthquake simulator code (Dieterich/Richards-Dinger). One goal is to streamline and optimize the algorithm to make it more scalable when running on high core counts on modern supercomputer platforms, such as... more
Poster 203	Seismology	Investigating Complex Slow Slip Evolution with High-Resolution Tremor Catalogs and Numerical Simulations Yajun Peng, Allan Rubin Significant complexities of episodic slip and tremor (ETS) have been revealed by short tremor bursts lasting minutes to hours, many of which show clear migration patterns. In Cascadia, large-scale rapid tremor reversals (RTRs) extend tens of km... more
Poster 233	Seismology	Microseismic event detection using local coherence: applications to the Long Beach 3D array and the Hi-CLIMB linear array Zhigang Peng, Zefeng Li, Dongdong Yao, Daniel Hollis, William Frank We recently developed a new method for seismic event detection, specifically designed for ultra-dense nodal-type seismic arrays [Li and Peng, in prep]. This method involves a function termed “local coherence” which quantifies the coherence of... more	15077
Poster 077	FARM	Shallow level incipient pulverization found with a restraining bend of the Clark segment of the San Jacinto Fault, southern California Daniel Peppard, Heather Webb, Gary Girty This poster characterizes the properties of incipient pulverization within a contractional bend along the Clark segment, San Jacinto fault. About 1.5 km SE of the study site, the Clark segment bifurcates into two branches. The NE-most splay, the... more
Poster 097	Geology	New slip rates and characterization of active faults in the northern Walker Lane Ian Pierce, Steven Wesnousky, Lewis Owen Antelope, Mason and Smith Valleys are half-grabens within the Northern Walker Lane, east and south of Carson City and Reno, Nevada. We apply recently acquired 0.5-1 m/pixel lidar data and terrestrial cosmogenic nuclide (TCN) surface exposure ages to... more
Poster 003	USR	CFM Version 5.1: New and revised 3D fault representations and an improved database. Andreas Plesch, Craig Nicholson, Christopher Sorlien, John Shaw, Egill Hauksson We present an updated version of the SCEC Community Fault Model (CFM) for southern California. For version 5.1, we focused on improving the database component of CFM which is critical for the internal consistency and maintainability of the model.... more	16122, 16065
Poster 300	WGCEP	Trimming the UCERF3-TD Hazard Tree with a New Probabilistic Model-Reduction Technique Keith Porter, Edward Field, Kevin Milner The Uniform California Earthquake Rupture Forecast Version 3, Time-Dependent (UCERF3-TD) logic tree has 5,760 branches, which can be computationally problematic for risk analysis of large portfolios, especially when multiplied by five NGAWest-2... more	13145
Poster 220	Seismology	Internal structure of the San Jacinto fault zone in the trifurcation area southeast of Anza, California, from data of dense linear arrays Lei Qin, Yehuda Ben-Zion, Hongrui Qiu, Pieter-Ewald Share, Zachary Ross, Frank Vernon We analyze two years of data from a linear array composed of six 3-component sensors separated by about 25 m, and one-month data from 1108 vertical geophones in ~650 m x 650 m box configuration with instrument spacing 10-30 m, straddling the Clark... more	16074
Poster 219	Seismology	Internal structure of the San Jacinto fault zone at Jackass Flat from data recorded by a dense linear array Hongrui Qiu, Yehuda Ben-Zion, Zachary Ross, Pieter-Ewald Share, Frank Vernon We analyze seismograms recorded by a dense linear array crossing the San Jacinto Fault Zone (SW to NE) at Jackass Flat (JF) southeast of the trifurcation area. The array has 9 stations with ~20-30 m separation in the center and total aperture of ~... more	16074
Poster 234	Seismology	Evaluation of Ambient Noise Green’s Functions Using Synthetic Ground Motions Santiago Rabade, Leonardo Ramirez-Guzman, Alan Juarez, Jorge Aguirre One of the recent topics of discussion in ambient noise processing is the reliability and validation of the Green's Functions obtained using cross-correlation techniques. We compared the latter against synthetic seismograms computed for... more
Poster 026	FARM	Biomarker thermal maturity at seismic timescales in high-velocity rotary shear experiments Hannah Rabinowitz, Heather Savage, Elena Spagnuolo, Giulio Di Toro Studies of past seismicity on sampled fault structures often rely on evidence of frictional heating on slip surfaces. Estimates of temperature rise on a fault provide constraints on the size of previous earthquakes hosted on the fault, allowing for... more
Poster 284	GMSV	Effects of realistic fault geometry on simulated ground motions in the 2010 Darfield Earthquake, New Zealand Hoby Razafindrakoto, Brendon Bradley, Robert Graves This study investigates the effects of earthquake source information on simulated hybrid broadband ground motions, using the 2010 Darfield Earthquake, New Zealand as a case study. The geometric complexity of the fault for the 2010 Darfield event... more
Poster 104	Geology	Towards morphologic and cosmogenic dating of paleoearthquake and fault slip rates in the Central Nevada Seismic Belt Tabor Reedy, Steven Wesnousky The Pleasant Valley Fault and Dixie Valley Fault are located approximately 30km and 90km south of Winnemucca NV, within the Central Nevada Seismic Belt a region of aligned, nearly continuous, historical normal-fault earthquakes that produced surface... more
Poster 092	Geology	Late Holocene rupture history of the Ash Hill fault, Eastern California Shear Zone Christine Regalla, Hannah Pangrcic, Eric Kirby, Eric McDonald Recent paleoseismic investigations in the Eastern California Shear Zone (ECSZ) suggest that the Panamint, Garlock, and Owens Valley faults may have experienced a late Holocene cluster of seismicity, concurrent with an ongoing <~1.5 ka cluster... more
Poster 015	SDOT	Role of fault geometry on the spatial distribution of the slip budget Phillip Resor, Michele Cooke, Scott Marshall, Elizabeth Madden A fundamental problem in earthquake physics is how stress is transferred from plate motion to faults. Kinematic models assume that long-term fault slip rates will sum to the plate velocity; however, in a number of locations in southern California... more	16164
Poster 087	Geology	Evidence for Abrupt Subsidence Event in Carpinteria Marsh at 2 ± 0.2 ka Laura Reynolds, Alexander Simms, Thomas Rockwell, John Bentz, Robert Peters Recent work by Simms et al., 2016 suggests Carpinteria Marsh, Carpinteria, California, has experienced an average of 1.2±0.4 mm/yr of subsidence in the last 7ka. However, the nature (ongoing vs. abrupt) of this subsidence remained unclear. Here we... more	14008, 13008, 15156, 16132
Poster 304	EFP	Earthquake likelihood models for New Zealand combining information on strain rates, earthquakes and faults David Rhoades, Annemarie Christophersen, Matthew Gerstenberger We have constructed a set of multiplicative hybrid earthquake likelihood models for the New Zealand CSEP testing region, in which cell rates in a spatially uniform baseline model are scaled using combinations of covariates derived from the... more	16068

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