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 323

SCEC ID	Category	Title and Authors	SCEC Award
Poster 298	GM	Characterization of high-wavenumber subsurface random heterogeneity using a very dense array at Diablo Canyon, California Nori Nakata Characterization of the subsurface random heterogeneity for higher wavenumber is key for high-frequency ground motion prediction. Recent technologies of portable user-friendly geophone arrays are useful for imaging much smaller heterogeneities as... more	18137
Poster 145	CXM	Enhancements, Updates, and Improved Access to the Community Fault Model Craig Nicholson, Andreas Plesch, John Shaw, Scott Marshall Although the Community Fault Model (CFM) is one of the most mature modeling efforts within SCEC and has seen widespread use in many aspects of our science (e.g., UCERF3, ground motion studies, earthquake simulators, rupture modeling, hazard... more	18032
Poster 107	Seismology	Testing the Amplitude of Ambient-field Green’s Function by Simulated Scattered Waves in a 3D Sedimentary Basin Shiying Nie, Shuo Ma We numerically simulate the scattered waves in a 3D sedimentary basin by using small-scale heterogeneities with 4421 point sources, uniformly distributed surrounding the basin. The simulated scattered wave fields make an ideal environment to test... more	15150
Poster 293	CS	Towards topography in AWP-ODC Ossian O'Reilly, Alexander Breuer, Yifeng Cui, Christine Goulet, Kim Olsen A central component for reliable seismic hazard assessment is that models produce good agreements with observations. To match observations at high frequencies ( > 1 Hz) it becomes increasingly important to capture the interaction of seismic... more
Poster 036	CSEP	3D models of seismicity beneath the Greater Tokyo Area Yosihiko Ogata, Koichi Katsura, Hiroshi Tsuruoka, Naoshi Hirata We consider a 3D models for the short-term forecast beneath the Metropolitan area (Kanto region) by extending the epidemic-type aftershock sequence (ETAS) models, taking account of the induced effect from the 2011 Tohoku-Oki earthquake of M9.... more
Poster 206	FARM	Dynamic rupture and cross-fault activation: the effect of high pre-stress contrast David Oglesby, Christodoulos Kyriakopoulos, Thomas Rockwell, Aron Meltzner, Michael Barall, Jon Fletcher The Brawley Seismic Zone (BSZ) is postulated to consist of several cross-faults that are roughly perpendicular to the main fault structures in the area, including the Southern San Andreas (SSAF) and Imperial (IF) fault systems. This geometric... more	18169
Poster 288	CME	California Transverse Mercator projection (CATM) for Building Gridded Seismic Velocity Volumes for Seismic Wave Propagation Simulations David Okaya, Yao-Yi Chiang, Philip Maechling, Mei-Hui Su Numerical computation of seismic wave propagation is a major tool within SCEC community research. From CME's high-end CyberShake and Broadband Platforms down to individual researcher needs for synthetic seismograms, all of these require inputs... more
Poster 044	EFP	Faulty Intuition about b-values and Aftershock Productivity within a Fault Network Morgan Page, Nicholas van der Elst When it comes to smaller earthquakes, are major faults special? Page et al. (2011) showed that earthquakes near the faults that compose version 3.0 of the SCEC Community Fault Model (CFM) have a lower Gutenberg-Richter b-value than earthquakes... more
Poster 142	Geodesy	Salton Trough Deformation in GeoGateway Tools, UAVSAR and GeoFEST Jay Parker, Gregory Lyzenga, Andrea Donnellan, Margaret Glasscoe, Marlon Pierce, Jun Wang, Magali Barba, Kristy Tiampo The southern Salton Trough is the best observed high-deformation zone on the western North American Plate boundary. The GeoGateway toolset and data portal allows access to several measures of deformation as customized layers in a Google Maps... more
Poster 241	Geology	The Hidden Past of the Alai Valley: Understanding the Seismic History and Behavior of the Central Pamir Frontal Thrust System through Paleoseismology. Magda Patyniak, Angela Landgraf, Ramon Arrowsmith, Atyrgul Dzhumabaeva , Alana Williams, Kanatbek Abdrakhmatov , Manfred Strecker The Pamir–Tien Shan convergence zone represents a major tectonic part of the Indian-Eurasian collision zone by accommodating nearly one-third of the total 44 mm/yr total shortening in the greater Pamir region. These high deformation rates across... more
Poster 297	CME	Developing Software to Support SCEC Research Collaborations and Data Dissemination: A Case Study of the Committee for the Utilization of Ground Motion Simulations (UGMS) Project Edric Pauk, Tran Huynh, Kevin Milner, Scott Callaghan, David Gill, Christine Goulet, C.B. Crouse Extremely large and complex datasets can be generated as a result of scientific research investigations. However, making these datasets easily accessible and usable for a wider community remains a challenging goal. The SCEC Committee for the... more	18141, 17233, 16169, 15006, 14208, 14214, 13138
Poster 239	Geology	Paleoseismology of the central Garlock Fault in Searles Valley, California. Kyle Peña, Sally McGill, Ed Rhodes, James Dolan, Robert Zinke, Alexandra Hatem, Nathan Brown In this study, a paleoseismic trench that was previously excavated by McGill, [1992] across the central Garlock Fault near Christmas Canyon, in Searles Valley, California, was reopened to investigate potential temporal variability in earthquake... more
Poster 276	SAFS	Urban Nodal Array Maps Structure of the Northern Los Angeles Basins with Teleseismic Receiver Functions Patricia Persaud, Guibao Liu, Robert Clayton Earthquake ground motions in the greater Los Angeles area are known to be affected by basin amplification and the channeling and focusing of seismic energy as it passes through the San Gabriel and San Bernardino basins in the northern part of this... more	18029
Poster 209	FARM	Dynamic rupture modeling to investigate the role of fault geometry in jumping rupture between parallel-trace thrust faults Paul Peshette, Julian Lozos, Doug Yule, Eileen Evans Fold and thrust belts (such as those found in the Himalaya or California Transverse Ranges) consist of many neighboring thrust faults in a variety of geometries. Active thrusts within these areas individually contribute to regional seismic hazard,... more	17251
Poster 317	CEO	Causes of deaths and injuries in the 2015 Gorkha (Nepal) earthquake Marla Petal The Mw7.8 April 25, 2015 Gorkha Earthquake took place on a Saturday, at 11:56am and reached maximum intensity of IX (MMS). The earthquake and its aftershocks killed more than 8,800 people and injured more than 22,000. There is urgent need to better... more
Poster 144	CXM	SCFM 3.1: Updates, maps and modeling support Andreas Plesch, John Shaw, . SCFM Working Group, Craig Nicholson We present an updated and enhanced version of the northern California Statewide Community Fault Model (SCFM-V.3.1). The updated model includes improved 3d fault representations, a new GIS trace map fully consistent with the 3d model, and a set of... more	18032
Poster 153	SDOT	New Constraints on Stress Heterogeneity along High Risk Fault Systems in the Santa Barbara Channel, California from Borehole Breakouts Edward Pritchard, Patricia Persaud, Joann Stock The Santa Barbara Channel represents the offshore portion of the Ventura Basin in Southern California. Miocene extension and ongoing transpression related to a regional left step in the San Andreas Fault have led to the formation of highly complex,... more	16062, 15012
Poster 231	Geology	Dear Prudence: how many surface clasts are required to yield an accurate exposure date? Veronica Prush, Michael Oskin Prush and Oskin (submitted) propose a new statistical model for determining the exposure age of offset fluvially deposited surfaces dated using surface clasts. Our model requires fitting a generalized Pareto distribution (GPD) to these datasets,... more	17121, 15209
Poster 299	GM	Multi-scale study of ground motion coherence in Piñon Flats Observatory Lei Qin, Christopher Johnson, Frank Vernon, Yehuda Ben-Zion Characterizing ground motions between closely spaced broadband stations can reveal new insight on variations in the crustal response to earthquake, seasonal and ambient sources of seismic energy. We study the coherence using three years (2015-2017)... more
Poster 100	Seismology	Eikonal Tomography of the Southern California Plate Boundary Region  Hongrui Qiu, Yehuda Ben-Zion, Fan-Chi Lin We use eikonal tomography to derive directionally-dependent phase and group velocities of surface waves for the plate boundary region in southern CA sensitive to the approximate depth range 1-20 km. Seismic noise data recorded by 346 stations in the... more
Poster 204	FARM	Multi-physical couplings and microstructure size effects on the localization of deformation in a fault core Hadrien Rattez, Ioannis Stefanou, Jean Sulem, Manolis Veveakis, Thomas Poulet Seismic slip in the brittle part of the lithosphere is often accompanied by extreme shear strain localization into a narrow, thin zone, which is called Principal Slip Zone (PSZ). According to field observations, the PSZ has a finite thickness and... more
Poster 257	Geology	Geomorphic and structural mapping in pursuit of a slip rate for the Santa Susana Fault, Southern California Michael Reed, Reed Burgette, Katherine Scharer, Nathaniel Lifton, Devin McPhillips The Santa Susana Fault (SSF) is a 38-km-long thrust fault that connects active faults along the margins of the Ventura and San Fernando basins within the Western Transverse Ranges of southern California. Despite proximity of the SSF to metropolitan... more	18143
Poster 227	Geology	Are offset channels accurate representations of strike-slip fault displacement? Implications from landscape evolution modeling Nadine Reitman, Karl Mueller, Gregory Tucker, Katherine Barnhart Strike-slip fault slip rates are commonly determined by correlating offset channels and dating the incised deposits. This approach is complicated by large uncertainties in pre-faulted channel morphology and temporal variation of stream incision,... more
Poster 074	Seismology	Fast moment acceleration in the development phase of an earthquake derived from a large catalog of Source Time Functions Julien Renou, Martin Vallée The earthquake source physics giving rise to events of very different magnitudes remains debated. Features in the initiation phase carrying information on the final magnitude have been proposed. Conversely, in the cascade model, the rupture grows in... more
Poster 304	GM	Towards Structural Imaging Using Scattering Artifacts Detected in Ambient Field Correlations Lise Retailleau, Gregory Beroza Correlations of the ambient seismic field have been used successfully for tomographic imaging of the Earth on a wide range of scales. This is based on the theoretical and experimental observations that correlation functions computed between the... more	18178
Poster 050	EFP	Improved medium-term earthquake forecasting: Compensating for incomplete contributions of precursory earthquakes David Rhoades, Annemarie Christophersen The EEPAS earthquake forecasting model treats Every Earthquake as a Precursor, According to Scale, of larger earthquakes to follow it in the medium term. It applies empirical predictive relations derived from examples of the precursory scale... more
Poster 065	Seismology	Envelope-Based Early Warning Algorithm Using Nested Grid Search Becky Roh, Thomas Heaton, Zachary Ross We present an envelope-based algorithm that implements a nested grid search. This algorithm is a direct solution that is simple to implement in parallel execution. The goal is to predict the magnitude, location, and origin time of an event using a... more
Poster 134	Geodesy	A long-term-average estimate of earthquake likelihoods and the largest earthquake in central Los Angeles Chris Rollins, Jean-Philippe Avouac Thrust earthquakes present a substantial hazard to Los Angeles, and geodetic data suggest that major thrust faults underlying the city are accruing elastic strain that may be released in future earthquakes. To quantify this hazard, we express this... more
Talk Tue 14:00	MSW	Detecting millions of earthquakes in southern California with template matching Zachary Ross, Egill Hauksson, Daniel Trugman, Peter Shearer Over the last twenty years, earthquake detection rates in southern California have improved dramatically, resulting in the minimum magnitude of completeness decreasing from M~2.5 to M~1.5 today. It is believed, however, that these events still... more
Poster 019	GM	Implementation of Iwan-type Plasticity Model in AWP-ODC Daniel Roten, Kim Olsen, Steven Day, Yifeng Cui Strong ground motions recorded on vertical arrays indicate that site response formalism (decoupled from source and path effects) fails to reproduce empirical surface-to-borehole transfer functions in the majority of cases due to the presence of... more	17162, 18168
Poster 106	Seismology	Full waveform ambient noise inversion Korbinian Sager, Christian Boehm, Laura Ermert, Lion Krischer, Andreas Fichtner We develop and apply a novel full waveform ambient noise inversion that jointly constrains 3D Earth structure and heterogeneous noise sources at the global scale. Modern tomographic techniques aim to exploit details in waveforms for the benefit of... more
Poster 005	EEII	Nonlinear Modeling of High-Rise Buildings Subject to Long-Period Ground Motion Lauren Santullo, Ahmed Elbanna, Setare Hajarolasvadi High rise buildings are particularly susceptible to long-period earthquake ground motion since the maximum displacement of the structure may approach or even exceed the peak ground displacement. Much of the currently used accelerometer data is of... more
Poster 014	GM	Simulated ground motions for induced seismicity at a 12-story structure in Oklahoma using the SCEC Broadband Platform Jessie Saunders, Frankie Martinez, Jennifer Haase, Mohamed Soliman Oklahoma has been experiencing an increase in seismicity due to wastewater injection related to oil and natural gas production. As many buildings in Oklahoma were constructed before this increase, it is imperative to determine the response of these... more
Poster 171	FARM	Gouge Development in the San Andreas Fault from Lake Elizabeth core samples Heather Savage, Randolph Williams, Christie Rowe Fault gouge is produced through a variety of processes, including pulverization, fracturing, grinding, weathering reactions, hydrothermal alteration, precipitation of cements, compaction, dilation, and possibly flash heating. We seek to quantify... more	18189
Poster 033	CSEP	The Collaboratory for the Study of Earthquake Predictability version 2.0 (CSEP2.0): New Capabilities in Earthquake Forecasting and Testing William Savran, Philip Maechling, Maximilian Werner, Thomas Jordan, Danijel Schorlemmer, David Rhoades, Warner Marzocchi, John Yu, John Vidale The Collaboratory for the Study of Earthquake Predictability (CSEP) supports an international effort to rigorously conduct earthquake forecasting experiments. CSEP testing centers now operate in California, New Zealand, Japan, China, and Europe,... more
Poster 263	SAFS	Paleoearthquakes within 100 km and 1000 years of modern Cajon Pass, California Katherine Scharer Cajon Pass, located at the juncture of the San Andreas Fault (SAF) and the San Jacinto Fault (SJF), is an area of significant risk due to its dense network of energy, communication, and transportation infrastructure that connects the greater Los... more
Poster 159	SDOT	Dipping fault structures near the brittle-ductile transition and deep foliation fabric in southern California Vera Schulte-Pelkum, Zachary Ross, Karl Mueller, Yehuda Ben-Zion We investigate fault structure and shear zone fabric across the brittle-ductile transition zone in Southern California using the earthquake catalog of Hauksson et al. (2012) and seismic anisotropy results from receiver functions. Depth profiles of... more	17097
Poster 116	Geodesy	Creep Along the Central San Andreas Fault Measured from Surface Cracks, 3D Topographic Differencing, and UAVSAR imagery Chelsea Scott, Nathan Toke, Michael Bunds, Manoochehr Shirzaei Along and near-fault observations of surface deformation on the central creeping segment of the San Andreas fault constrain on-fault slip rate, distributed deformation, and the physical mechanisms that accommodate shallow aseismic deformation. Here... more
Poster 170	FARM	Detailed mapping of normal fault array geometry using dm-scale high resolution topographic imagery from the Volcanic Tablelands, Bishop, California Tyler Scott, Ramon Arrowsmith, Chelsea Scott, Daniel Lao Davila The Volcanic Tablelands in northern Owens Valley California offer an unusual exposure of well-preserved and discontinuous meter to kilometer long normal faults formed by regional E-W extension. The region is one of the best natural laboratories to... more
Poster 265	SAFS	When do San Andreas Fault ruptures diverge on to other faults? Gordon Seitz, David Schwartz Increasingly, multi-fault ruptures have been recognized and hazard models have evolved to consider fault network behavior rather than that of individual faults. The San Andreas Fault (SAF) has major fault branches with the San Jacinto (SJF) and San... more
Poster 175	FARM	Seismic Radiation During Slip Along a Bimaterial Fault: An Experimental Investigation Tanner Shadoan, Brett Carpenter, Ze'ev Reches, Xiaofeng Chen, Simon Zu Large slip along faults is likely to place crustal blocks of different lithological and mechanical properties against one another to form bimaterial-faults. For example, the Punchbowl fault in southern California is a bimaterial fault with igneous... more
Poster 063	Seismology	The Similarity Matrix Profile, an efficient method for detecting both low and high signal to noise ratio seismic events in very long time series Nader Shakibay Senobari, Gareth Funning, Zachary Zimmerman, Yan Zhu, Eamonn Keogh We propose here an alternative, efficient method for seismic event detection for continuous data– the similarity Matrix Profile (MP). The MP is essentially a report of the index (i.e. location in the time series) and correlation coefficient (CC)... more
Poster 101	Seismology	Seismic imaging of the Southern California plate boundary around the South-Central Transverse Ranges using double-difference tomography and fault zone head waves Pieter-Ewald Share, Hao Guo, Clifford Thurber, Haijiang Zhang, Yehuda Ben-Zion We image seismic velocity structures within the South-Central Transverse Ranges using fault zone head waves (FZHW) and a new double-difference tomography algorithm incorporating both event and station pairs. The tomography provides information on... more
Talk Tue 10:30	EFP	Earthquake Simulators are Ready for Prime Time Bruce Shaw A major leap has been made in the last year where earthquake simulators have been shown to replicate seismic hazard statistics across California, matching remarkably well the results from UCERF3. What this means, how to take advantage of it, why it... more
Poster 075	Seismology	Testing and Reconciling EGF Methods for Estimating Corner Frequency and Stress Drop from P-wave Spectra Peter Shearer, Rachel Abercrombie, Daniel Trugman, Wei Wang Researchers have long used empirical Green’s function (EGF) approaches to correct body-wave spectra for attenuation and estimate corner frequencies and Brune-type stress drops. Recently, however, it has become clear that there are strong tradeoffs... more	17041
Poster 062	Seismology	Illuminating faulting complexity of the 2017 Yellowstone (Maple Creek) earthquake swarm David Shelly, Jeanne Hardebeck The 2017 Maple Creek earthquake swarm was one of the most prolific swarms to occur in the Yellowstone region in the past decades, with more than 2000 earthquakes up to Mw 4.4 cataloged by University of Utah Seismograph Stations (UUSS) between June... more
Poster 132	Geodesy	Decadal variation of crustal deformation in California inferred from EDM and GPS and its implication to seismic hazard Zheng-Kang Shen, Yuehua Zeng Prior to GPS, the Electronic Distance Meter (EDM, or Trilateration) technique was used from the 1960s to early 1990s to measure crustal deformation across major faults in California. Although the data may not be as accurate as GPS (relative... more	18208
Poster 191	FARM	Modeling low-frequency earthquakes on a rate-and-state fault Zhichao Shen, Nadia Lapusta Benefitting from the dense seismic networks deployed over the past two decades, the discovery of low-frequency earthquakes (LFEs) has enhanced our vision of the fault slip behavior. Compared to regular earthquakes of the same magnitude, LFEs are... more	18085, 17154
Poster 148	CXM	Inferring crustal viscosity from seismic velocity: Application to the lower crust of Southern California William Shinevar, Mark Behn, Greg Hirth, Oliver Jagoutz We investigate the role of composition on the viscosity of the lower crust through a joint inversion of seismic P-wave (Vp) and S-wave (Vs) velocities. We determine the efficacy of using seismic velocity to constrain viscosity, extending previous... more	16106, 17202, 18156
Poster 015	GM	The SCEC Broadband Platform: Open-Source Software for Strong Ground Motion Simulation and Validation Fabio Silva, Philip Maechling, Christine Goulet, John Vidale The Southern California Earthquake Center (SCEC) Broadband Platform (BBP) is a carefully integrated and validated collection of modular open-source scientific software programs that can simulate broadband (0-20+ Hz) ground motions for earthquakes at... more	18092, 18146, 17137, 17138, 17247

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