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 336

SCEC ID	Category	Title and Authors	SCEC Award
Poster 176	FARM	Slip evolution across geometric barrier during the 2018 Palu Indonesia earthquake Ryo Okuwaki, Yuji Yagi How does a slip follow earthquake-rupture front propagating faster than at a local shear-wave velocity (supershear speed)? How does a supershear-rupture front go across geometric discontinuity in a fault system? Resolving in detail such a complex... more
Poster 136	SAFS	Using UAV-mounted LiDAR surveys to investigate potential slip rate sites along the northernmost San Jacinto fault zone near its junction with the San Andreas fault in the Cajon Pass area, California Nate Onderdonk, Drake Kerr, Paula Figueiredo Paleoseismic data, slip-rate data, and modeling suggest that slip transfer between the San Andreas and San Jacinto faults may occur during simultaneous rupture of the two faults in the Cajon Pass area. To test this idea, slip-rate measurements and... more	18124
Poster 145	FARM	Does a damaged fault zone mitigate the near-field landslide risk during supershear earthquakes?—Application to the 2018 magnitude 7.5 Palu earthquake Elif Oral, Huihui Weng, Jean-Paul Ampuero The 2018 Mw 7.5 Palu earthquake ruptured a strike-slip fault with a length of 150 km and struck the city of Palu severely by triggering many catastrophic phenomena in the proximity of the fault. Devastating tsunamis in the Palu Bay are triggered... more
Poster 078	Seismology	A Percolation Model for Induced Seismicity: An Avalanche Burst Model for Induced b-Value Seismicity. Ronaldo Ortez, John Rundle In the interest of being able to reproduce the kinds of fracture networks produced during hydraulic fracking, we use percolation models which, near criticality, seem to produce the kinds of networks consistent with those produced during fracking. To... more
Poster 219	Ridgecrest	Fault slip distribution along the southern 15 km of the M7.1 Ridgecrest earthquake surface rupture Salena Padilla, Sinan Akciz, Alexandra Hatem, James Dolan, Ridgecrest Rupture Mapping Group A pair of large earthquakes struck the Searles Valley, California area on July 4 and 5, 2019. The July 5, M7.1 earthquake northeast of Ridgecrest, CA, ruptured bilaterally along an ~50 km long, right-lateral, fault zone striking NW-SE. We followed... more
Poster 028	EFP	Explaining the paleo-event hiatus in California Morgan Page, Edward Field, Kevin Milner, Nicholas van der Elst There has been a notable absence of large earthquakes in the last century in California, particularly on the highest slip-rate faults. This lull was noted by Jackson (2014), who argued that the observed data precluded Poissonian or lognormal... more
Poster 047	Seismology	Near-Surface Structure Constrained Using Body-Wave Polarization Sunyoung Park, Victor Tsai, Miaki Ishii Body-wave polarization is sensitive to properties immediately beneath a seismic instrument, and has been demonstrated to be effective at estimating the near-surface P- and S-wave speeds (Park & Ishii, 2018*). In this presentation, we discuss... more
Poster 077	Seismology	The Guy-Greenbrier seismic sequence revisited with deep learning Yongsoo Park, Mostafa Mousavi, Weiqiang Zhu, William Ellsworth, Gregory Beroza The emerging deep-learning-based algorithms for earthquake detection and phase arrival time picking have shown to be promising replacements for traditional methods such as STA/LTA and template matching. We revisited the Guy-Greenbrier, Arkansas,... more
Poster 245	Ridgecrest	Source, Site and Path Characterization of the July 2019 M7.1 and M6.4 Ridgecrest Earthquake Sequence Grace Parker, Annemarie Baltay, Eric Thompson, John Rekoske, Dan McNamara The 2019 July 5 M7.1 Ridgecrest, California earthquake generated peak ground motions in excess of 50% g and 60 cm/s near the fault and was recorded on over 700 local and regional seismic stations across California and eastern Nevada. In addition,... more
Poster 215	Geodesy	Tools for GNSS application to tectonics Jay Parker, Michael Heflin, Andrea Donnellan We propose a common set of tools for regional GNSS time series analysis. To retrieve regional time-limited sets of time series for earthquakes and other phenomena simple scripting elements reduce the varieties of center-specific formats to a... more
Poster 305	CEO	The Future of the SCEC Community Information System Edric Pauk, Tran Huynh, Mei-Hui Su, Philip Maechling SCEC provides scientists with collaborative, computing and data management facilities to support research collaborations, project administration, education and outreach programs, and advanced computational science. The SCEC Community Information... more
Poster 107	Geology	Paleoseismic Results from the Christmas Canyon West Site, Central Garlock Fault, Searles Valley, California Kyle Peña, Sally McGill, Ed Rhodes, James Dolan, Nathan Brown, Bryan Castillo, Alexandra Hatem, Sourav Saha, Robert Zinke In this study, a paleoseismic trench with limited age constraints that was previously excavated in 1990 across the central Garlock Fault west of Christmas Canyon, in Searles Valley, California, was reopened to take advantage of new advances in... more
Poster 239	Ridgecrest	Rheological implications of post-seismic deformation following the 2019 Ridgecrest Earthquakes Camilla Penney, Jean-Philippe Avouac Large earthquakes provide an opportunity to probe the rheology of the lithosphere and upper asthenosphere. The 2019 Ridgecrest earthquakes occurred in an area which may have significantly heterogeneous rheological properties, due to its proximity to... more
Poster 285	Seismology	Field Volunteers for the Los Angeles BASIN Seismic Experiment – Phase IV Patricia Persaud, Robert Clayton, Marine Denolle, Jascha Polet In mid-November 2019, we will launch the fourth and final phase of the BASIN seismic deployments in the greater Los Angeles area. We are seeking further volunteers to help make the deployment of an additional 262 compact seismic units called nodes... more	19033, 18029
Poster 137	SAFS	Using Ground-based Magnetics, VLF, and DC Resistivity to Examine Faulting at the San Andreas Oasis, Dos Palmas Preserve Stacey Petrashek, Nathan Pulver, Raul Contreras, Drew Faherty, Jascha Polet The San Andreas Oasis is located northeast of the Salton Sea near the convergence of several faults including the Hidden Spring and Powerline Faults, traces of which are mapped along a series of oases, seeps, and springs. Due to declining water... more
Poster 218	Ridgecrest	Detailed fracture map and orthophoto of the southern portion of the M7.1 2019 Ridgecrest Earthquake Ian Pierce, Alana Williams, Rich Koehler, Sinan Akciz, Colin Chupik, Jayne Bormann An M7.1 earthquake struck on July 5, 2019, near Ridgecrest, California, and ruptured bilaterally. An M6.4 event preceded this earthquake on July 4. Between July 5 and July 9, more than 20,000 low altitude aerial photos were acquired along ~12 km of... more
Poster 060	Seismology	Rupture Models and Implication of Rupture Dynamics in Simulated Ground Motion for the 2016 M7 Kumamoto, Japan Earthquake Arben Pitarka, Robert Graves, Arthur Rodgers, Kojiro Irikura, Ken Miyakoshi, Hiroshi Kawase We performed simulations of rupture dynamics for a shallow M6.5 crustal earthquake to investigate the implication of multi-scale stress drop spatial variations on rupture dynamics and generation of Strong Motion Generation Areas (SMGA) and Long... more
Poster 278	Ridgecrest	Detailed 3D source fault representations for the 2019 Ridgecrest earthquake sequence Andreas Plesch, John Shaw, Zachary Ross, Egill Hauksson We present a new 3D source fault representation for the 2019 M6.4 and M7.1 Ridgecrest earthquake sequence, which includes the Eastern and Southern Little Lake faults as part of the regional Little Lake fault zone (Wills, 1988). These representations... more	19102
Poster 319	CXM	A volumetric, CFM compatible, Geologic Framework Model (GFM) Andreas Plesch, John Shaw, Michael Oskin, Philip Maechling We present a volumetric version of the SCEC Geologic Framework Model (GFM) which attempts to be compatible with other SCEC Community Models (CXMs) and which can be queried at any 3d location. The model is based on an initial definition of 23... more	19104
Poster 122	Geology	Using Ground Penetrating Radar and Magnetic Gradiometry to Detect Archaeological Artifacts from the San Salvador Settlement in Colton, California, buried during the Santa Ana River’s Great Flood of 1862 Oscar Prado, Chloe Sutkowski, Veronica Hernandez, Jascha Polet In 1862, the Santa Ana River flooded the then largest settlement between New Mexico and Los Angeles, known as San Salvador. Adobe homes and the settlers’ belongings were either washed away or buried. Historical archives demonstrate that a... more
Poster 041	Seismology	Imaging and monitoring temporal changes of shallow seismic velocities at the Garner Valley near Anza, California, following the M7.2 2010 El Mayor-Cucapah earthquake Lei Qin, Yehuda Ben-Zion, Luis Bonilla, Jamison Steidl Recordings from ~700 events in 2010 at Garner Valley Downhole Array (GVDA) stations in southern California at various depths (0 m, 6 m, 15 m, 22 m, 50 m, and 150 m) are used to analyze the shallow velocity structure and temporal changes of seismic... more	19072
Poster 048	Seismology	Damage Zone Resonance: Observation and Analytical Fitting of Fault Zone Trapped Wave Normal Modes Using Large-N Near-fault Seismic Arrays Hongrui Qiu, Amir Allam, Fan-Chi Lin, Yehuda Ben-Zion We present the first observations of the full spatial eigen-function of fault zone trapped wave normal modes recorded on a dense large-N near-fault geophone array. The cumulative product of brittle deformation surrounding active faults ¬- the damage... more
Poster 296	CS	Towards High Order Octree-Based Finite Element Earthquake Simulations Leonardo Ramirez-Guzman Recent advances in the use of octrees highlight the advantages and drawbacks of this data structure when used in conjunction with the finite element method to solve large-scale wave propagation problems. Challenges in the incorporation of... more
Poster 096	Geology	Assessment of Slip and Deformation Along the Santa Susana Fault, Southern California, Using High Resolution Topography Michael Reed, Reed Burgette, Katherine Scharer, Nathaniel Lifton, Devin McPhillips The Santa Susana fault (SSF), located in the Western Transverse Ranges of southern California, is a 38-km-long active thrust fault. The trace of the SSF is near the northern margin of the Los Angeles metropolitan area and connects other active... more	18143
Poster 110	Geology	Offset channels are incomplete records of strike-slip fault displacement Nadine Reitman, Karl Mueller, Greg Tucker, Ryan Gold, Rich Briggs, Katherine Barnhart Slip rates for historic and paleoseismic strike-slip faults are commonly determined by correlating channels offset across a fault, measuring the offset distance, and dating the incised deposit. This process is complicated by large uncertainties in... more
Poster 311	CXM	Tomography of Central California Using Ambient Field Correlations Lise Retailleau, Aurelien Mordret, 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	18223
Poster 098	Geology	Cone penetrometer tests, continuous cores and paleoseismic trenching combined to infer a high mid-Holocene slip rate for the Imperial Fault, California Thomas Rockwell, Yann Klinger, Andrew Jerrett, Kaitlin Wessel, Drake Singleton, Yuval Levy, Koji Okumura We conducted a multi-disciplinary approach to study the paleoseismology on the Imperial fault along the section that ruptured during the Mw7 1940 earthquake. We investigated a small pull-apart basin in the Imperial Valley, located about 2 km north... more	14044
Poster 015	GM	Hayward Fault Earthquake Ground Motion Simulations on GPU-Accelerated Platforms with SW4-RAJA Arthur Rodgers, Ramesh Pankajakshan, Bjorn Sjogreen, Anders Petersson, Arben Pitarka Advances in numerical methods, improvements in rupture models and 3D Earth structure and the inexorable growth of computational power enable higher resolution earthquake ground motion simulations. We are modeling ground motions to frequencies of 5... more
Poster 142	SAFS	Paleoseismic investigation and mechanical modeling of rupture behavior through Cajon Pass Alba M. Rodriguez Padilla, Michael Oskin, Thomas Rockwell, Irina Delusina, Drake Singleton Assessment of the probability of multi-fault ruptures requires a better understanding of the mechanics and paleoseismic history at fault junctions. We investigate the junction of the San Jacinto fault with the San Andreas fault at Cajon Pass. Here... more	18040
Poster 083	Seismology	Directivity Modes of Earthquake Populations with Unsupervised Learning Zachary Ross, Daniel Trugman, Kamyar Azizzadenesheli, Anima Anandkumar We present a novel approach for resolving modes of rupture directivity in large populations of earthquakes. A seismic spectral decomposition technique is used to first produce relative measurements of radiated energy for earthquakes in a spatially-... more
Poster 005	GM	An Iwan-type Plasticity Model for 3D Simulations of San Andreas Scenario Earthquakes Daniel Roten, Kim Olsen, Steven Day, Yifeng Cui Understanding ground motions as the coupled response of inelastic off-fault and shallow nonlinear behavior represents a research priority within SCEC5, and the verification and validation of wave propagation codes which accurately model the... more	18168, 19128
Poster 204	Geodesy	Episodic tremor and slip dynamics in south-central Alaska Baptiste Rousset, Yuning Fu, Noel Bartlow, Roland Bürgmann During the last two decades, slow slip events (SSEs) and associated tectonic tremors have been documented downdip of seismogenic zones of young and warm subduction zones. We investigate the relationship between aseismic slip transients and tremors... more
Poster 033	EFP	Forecasts of Induced Seismicity and its Hazard from a Hydromechanical Earthquake Nucleation Model Justin Rubinstein, Jack Norbeck, Andrew Barbour We apply a seismicity model based on a rate-and-state friction framework to study the induced earthquakes in Oklahoma and Kansas. This model uses fluid pressures computed following the assumption that pressure changes are dominated by reservoir... more
Poster 129	SAFS	Influence of sediment dynamics and alluvial fan formation on paleoseismic studies in southern California, North America Sourav Saha, Seulgi Moon, Nathan Brown, Ed Rhodes, Sally McGill, Bryan Castillo, Katherine Scharer, Devin McPhillips, Doug Yule Paleoseismic data provide a record of past surface-rupturing earthquakes, but the fidelity of the record depends on the completeness of trench stratigraphy and the precision of geochronology. For example, a period of erosion might scour fault... more
Poster 106	Geology	Shallow Surface Deformation on the Southern Imperial Fault System from Marine Subsurface Imaging Data Valerie Sahakian, Neal Driscoll, Boe Derosier, Brian Oller, Alexis Klimasewski, Joann Stock Hosting two >M6 earthquakes in the past century and estimated to accommodate 30 – 45 mm/yr of slip, the Imperial Fault (IF) system is a large component of Southern California tectonics. Despite its contribution to regional seismic hazard and... more	18119
Poster 113	Geology	Detecting active faults in intramountain basins using Electric Resistivity Tomography Hamid Sana, Petr Taborik, Fayaz A. Bhat, Jan Flašar, Petra Stepancikova Kashmir basin in the NW Himalaya is surrounded by main Himalayan boundary faults, has very well documented historical earthquakes and a good instrumental earthquake record. However, the causative faults of these earthquakes except the 8 October 2005... more
Poster 321	CXM	Contribution to the Community Geodetic Model: Line-of-Sight Deformation Time-series along the San Andreas Fault System from Sentinel-1 InSAR and GPS David Sandwell, Xiaohua Xu, Emilie Klein, Peng Fang, Yehuda Bock We present a crustal deformation time-series along the San Andreas Fault System by combining measurements from Sentinel-1 Interferometric Synthetic Aperture Radar (InSAR) and Global Positioning System (GPS) data. We assembled 9 tracks of Sentinel-1... more	19083, 18134
Poster 273	Ridgecrest	Implications of uncertainty in ground motion estimates on ShakeAlert alerting strategies: Considering the 2019 Ridgecrest earthquake sequence Jessie Saunders, Brad Aagaard, Annemarie Baltay, Sarah Minson The July 2019 Mw6.4 and Mw7.1 Ridgecrest earthquakes were the largest earthquakes to occur in Southern California in 20 years and were widely felt throughout the region. The lack of earthquake early warning (EEW) alerts issued to residents of Los... more
Poster 153	FARM	Coupling biomarker thermal maturity with K-Ar dating to assess the earthquake slip history of the central San Andreas fault Heather Savage, Genevieve Coffey, Pratigya Polissar, Sidney Hemming, Stephen Cox, Gisela Winckler, Kelly Bradbury The San Andreas fault consists of a stable creeping section sandwiched between two earthquake-producing locked sections. Historical earthquakes have ruptured the northern and southern sections, but it is unclear whether large earthquakes can... more	14112
Poster 269	Ridgecrest	Pseudo-Prospective Evaluation of Operational UCERF3-ETAS Forecasts during the Ridgecrest, California, Earthquake Sequence William Savran, Maximilian Werner, David Rhoades, David Jackson, Edward Field, Kevin Milner, Andrew Michael, Thomas Jordan, Philip Maechling The Ridgecrest earthquake sequence began with a Mw6.4 earthquake that occurred on July 4, 2019, and was followed within 36 hours by a Mw7.1 earthquake. The sequence included the largest earthquake in California since the 1999 Mw7.1 Hector Mine and... more
Poster 209	Geodesy	Estimating Fault Configurations From InSAR Data Cameron Saylor Significant errors can occur in fault geometry and slip dislocation models as a result of volumetric distributions of sources not well represented by simple planar or rectangular fault models. For this reason, it is necessary to utilize all of the... more
Poster 085	Seismology	Comparing seismological interpretations of different source types produced in a rate-and-state fault model Natalie Schaal, Nadia Lapusta, Yen-Yu Lin Seismological methods rely on a number of simplifying assumptions about the earthquake source to interpret observed spectra of seismic signals in terms of event durations and stress drops. Following Madariaga [1976] and similar studies, these... more	18174, 19085
Poster 091	Seismology	Analysis and removal of sediment signal in receiver functions Vera Schulte-Pelkum, Justin Ball, Thorsten Becker, Robert Porritt, Whitney Behr Receiver functions in sedimentary basins can show strong shallow reverberations that can overprint signal from the deeper crust and Moho. At the same time, these reverberations carry information on near-surface velocity structure that may be useful... more	17098, 19096
Poster 206	Geodesy	Imaging a decade of creep along the San Andreas Fault from UAVSAR: Initial Results Chelsea Scott, Manoochehr Shirzaei Our project focuses on using imagery from NASA’s Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR) mission to image almost a decade of creep along the southern and central San Andreas Fault. The high coherence L-band UAVSAR imagery offers... more	19123
Poster 120	Geology	Rock Traits from Machine Learning: applications to precariously balanced rocks and fault scarps in Southern California Tyler Scott, Zhiang Chen, Chelsea Scott, Jnaneshwar Das, Ramon Arrowsmith Rock traits (size distribution, shapes, orientation, composition of pebbles, cobbles, clasts) distinguish many geologic features important in earthquake geology research. These include alluvial fans (fault activity, geomorphologic intensity), rock... more	19179
Poster 222	Ridgecrest	The Origin of Surface Cracks from the 2019 Ridgecrest Earthquake Sequence M6.4 and M7.1 Fault Zones: Primary Faulting, Triggered Slip or Shaking Related; Can we tell the difference? Gordon Seitz, Maxime Mareschal, Timothy Dawson, Chris Milliner Although large magnitude strike-slip earthquakes are often characterized by relatively simple ruptures, they generally also include rather complex zones of cracking resulting from various origins. Mapping of the 2019 Ridgecrest Earthquake Sequence... more
Poster 193	SDOT	Newly Detected Strain Transient on the Anza Segment of the San Jacinto Fault Zone, Southern California Heather Shaddox, Susan Schwartz, Noel Bartlow The Anza segment of the San Jacinto fault zone (SJFZ) in southern California contains a ~20 km long seismic gap that presents a future earthquake hazard. Inbal et al. (2017) identified two episodes of deep (>10 km locking depth) aseismic slip on... more	18160
Poster 070	Seismology	Using the Matrix Profile to detect seismic events – from the lab experiment scale to local and global scales Nader Shakibay Senobari, Zachary Zimmerman, Gareth Funning, Peter Shearer, Philip Brisk, Eamonn Keogh We present the results from applying our new similarity search method for continuous seismic data – the Similarity Matrix Profile or, more commonly, just the Matrix Profile (MP) – on several case studies from micro to macro scales. The MP approach... more
Poster 140	SAFS	Structural Properties of the Southern San Andreas Fault System near Coachella Valley from Magnetotelluric Imaging Pieter-Ewald Share, Jared Peacock, Steven Constable, Frank Vernon In Southern California, the southern San Andreas fault (SSAF) remains enigmatic at depth, despite several attempts at imaging fault structure in the area. Much of our inability to adequately constrain fault properties stems from the relative lack of... more	19200
Poster 307	CEO	Earthquake Forecasting Using Machine Learning Algorithms Alexei Shatz, Julie Pastorino, Jared Santa Maria, Yuner Lu, Yonatan Gugsa, Daniel Molina, William Savran, Thomas Jordan The San Andreas Fault System (SAFS), which comprises of the San Andreas, Hayward, Elsinore, and San Jacinto faults, has been experiencing an absence of Mw 7.0 or greater earthquakes for a period of 100 years or more. Due to the absence of large... more

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