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 251-300 of 320

SCEC ID	Category	Title and Authors	SCEC Award
Poster 158	FARM	Experimental Investigation of the Origins of Brittle Fracture Roughness Will Steinhardt, Shmuel Rubinstein As a crack front moves through a material, it leaves in its wake a fracture surface that preserves the time history of the crack front’s motion. For geological materials, this surface is rough, a remnant of the crack’s tortuous path. Rough crack... more
Poster 213	Geodesy	Deep Learning-based Damage Mapping with InSAR Coherence Time Series Oliver Stephenson, Tobias Koehne, Eric Zhan, Brent Cahill, Zachary Ross, Sang-Ho Yun Fast response in the aftermath of natural disasters is essential to minimize casualties. In order to assist effective use of limited response resources, rapid and accurate mapping of the extent and intensity of disaster-induced damage over tens to... more
Poster 244	Ridgecrest	Engineering and Geological Effects of the July 2019 Ridgecrest Earthquake Sequence Jonathan Stewart, Scott Brandenberg, Pengfei Wang, Chukwuebuka Nweke, Kenneth Hudson, Silvia Mazzoni, Yousef Bozorgnia, Kenneth Hudnut, Craig Davis, Sean Ahdi, Farzin Zareian, Jawad Fayaz, Rich Koehler, C Chupik, Ian Pierce, A Williams, Sinan Akciz, Martin Hudson, T Kishida, Benjamin Brooks, Ryan Gold, Daniel Ponti, Katherine Scharer, Devin McPhillips, T Ericksen, J Hernandez, Jason Patton, Brian Olson, Timothy Dawson, Jerry Treiman, Christopher DuRoss, Kelly Blake, Jeffrey Bachhuber, Christopher Madugo, J Sun, Andrea Donnellan, Gregory Lyzenga, Erik Conway, Christine Goulet The Ridgecrest Earthquake sequence included a foreshock event on July 4 2019 (M6.4) and a M7.1 mainshock event on July 5 2019. These events occurred in the Eastern California Shear Zone, near Indian Wells Valley, south of China Lake and west of... more
Poster 322	CXM	A Queryable Map-Based Web Interface to the SCEC Community Fault Model Mei-Hui Su, Philip Maechling, Scott Marshall, Craig Nicholson, Andreas Plesch, John Shaw, Edric Pauk, Tran Huynh, Elizabeth Hearn The Southern California Earthquake Center (SCEC) Community Fault Model (CFM) is an object-oriented, three-dimensional (3D) representation of active faults in southern California and adjacent offshore basins that includes 105 complex fault systems... more	19102, 18032
Poster 172	FARM	Realistic variability in seismic moment and recurrence time of repeating earthquakes reproduced in models with fractal shapes of fault patches Kavya Sudhir, Nadia Lapusta Observations indicate that even repeating earthquake sequences display significant variability in their moment and recurrence time. Similarly, creeping segments may be accumulating their slip unsteadily, as suggested by surface creep meters and... more	19086
Poster 072	Seismology	Seismicity in Changning Sichuan, China Li Sun A magnitude 6.2 earthquake occurred in Changning Sichuan, China on June 17, 2019. Before this event, there was no earthquake larger than 6.0 occurred Changning and surrounding area. The aftershocks of this event spread nearly 20 km in northwest of... more
Poster 044	Seismology	Search for seismic velocity changes associated with CO2 injections at the carbon capture and storage site in Decatur, Illinois Taka'aki Taira, J. Ole Kaven, Justin Rubinstein, Elizabeth Cochran We explore the temporal variations in seismic velocity at the Decatur carbon capture and storage (CCS) site by using seismic interferometry with ambient noise. A dense local seismic network has been installed and operated by U.S. Geological Survey... more
Poster 162	FARM	Evolution of frictional shear resistance in response to rapid variations of normal stress Yuval Tal, Vito Rubino, Ares Rosakis, Nadia Lapusta A proper formulation of the shear-resistance evolution during rupture is essential for many earthquake source problems, including simulations of the ground motion. While the shear resistance is typically assumed to be proportional to normal stress,... more	19093
Poster 247	Ridgecrest	Prediction of Ground-Motion Time-Series at an arbitrary location using Gaussian Process Interpolation: Application to the Ridgecrest Earthquake Aidin Tamhidi, Nicolas Kuehn, Yousef Bozorgnia, Ertugrul Taciroglu, Tadahiro Kishida Every seismic event is recorded only at a finite number of locations. In many engineering applications a variety of seismic intensity measures (IMs), typically peak ground acceleration or response spectrum, are required as input, that are estimated... more
Poster 303	CEO	A conceptual framework of the China Seismic Experimental Site (CSES) Yi Tang As a natural laboratory in earthquake science and technology, the China Seismic Experimental Site (CSES), by provide a principal natural laboratory in the Sichuan-Yunnan region, plays important role in investigator-driven and supports core... more
Poster 166	FARM	Stress Heterogeneity and Slip Complexity due to Fault Zone Damage in Fully Dynamic Earthquake Cycles Prithvi Thakur, Yihe Huang Mechanical modeling of fault-slip over long timescales is of fundamental importance for understanding earthquake physics and assessing seismic hazard. Mature strike-slip faults are usually surrounded by a narrow zone of damaged rocks characterized... more
Poster 317	CXM	Preliminary SCEC Community Rheology Model Wayne Thatcher, Elizabeth Hearn, Michael Oskin, Laurent Montesi, Greg Hirth, Whitney Behr, Andreas Plesch, John Shaw The SCEC Community Rheology Model (CRM) is a three-dimensional description of the rheology of southern California’s lithosphere, based on an ongoing synthesis of data from a wide range of sources. These sources include but are not limited to seismic... more	19195
Poster 250	Ridgecrest	Automated processing of the 2019 Ridgecrest, California, earthquake sequence ground motions Eric Thompson, Mike Hearne, John Rekoske, Heather Schovanec, Morgan Moschetti, Brad Aagaard, Grace Parker We describe ongoing efforts at the U.S. Geological Survey (USGS) to develop automated open-source ground motion processing software. Within the USGS, numerous projects have highlighted the need for standardized and automated ground-motion processing... more
Poster 266	Ridgecrest	Anti-similar aftershocks in the Ridgecrest, California earthquake sequence Daniel Trugman, Zachary Ross, Paul Johnson Similar earthquakes - pairs of events with highly similar waveforms - rupture overlapping or adjacent fault patches with similar slip mechanisms. Close examination of the characteristics of similar earthquake pairs have been used for a variety of... more
Poster 115	Geology	Refining the location of the coastal Newport-Inglewood fault with Structure from Motion photogrammetric models and shallow marine seismic profiling Amber Tucker, Jayne Bormann, Neal Driscoll The Newport-Inglewood fault (NIF) is an active fault with a history of damaging earthquakes that cuts coastal communities in Southern California. Onshore, the fault extends from Beverly Hills to Newport Beach, where it continues offshore to connect... more	18192
Poster 062	Seismology	Site Response Across the San Gabriel, Chino and San Bernardino Sedimentary Basins from Application of the Spectral Ratio Method to Ambient Noise Recorded by Seismic Node Transects Anisha Tyagi, Samuel Gurley, Margaret Grenier, Rachel Kreuziger, Jascha Polet The San Gabriel, Chino and San Bernardino Basins are heavily populated sedimentary basins that are bounded by a series of faults. Sedimentary basins are known to amplify earthquake ground motions; therefore, it is crucially important to understand... more
Poster 320	CXM	Complementing CGM with surface deformation measurements from dense catalogs of SAR data Ekaterina Tymofyeyeva, Yuri Fialko The SCEC Community Geodetic Model (CGM) aims to describe surface deformation in Southern California at highest possible spatio-temporal resolution and accuracy. This requires an optimal integration of GPS and InSAR (Interferometric Synthetic... more	19234
Poster 150	FARM	Surface Displacement and Ground Motion from Dynamic Rupture Models of Thrust Faults with Variable Dip Angles and Burial Depths Sirena Ulloa, Julian Lozos Historic earthquakes and empirical studies show that thrust fault ruptures produce stronger ground motion than normal or strike-slip events of the same magnitude. This is due to a combination of hanging wall effects, vertical asymmetry, and higher... more	18218
Poster 299	CS	MASTODON: An open source finite element tool to model seismic response of structures Swetha Veeraraghavan, Chandrakanth Bolisetti, Andrew Slaughter, William Hoffman, Justin Coleman Multi-hazard Analysis for STOchastic time-DOmaiN phenomena (MASTODON; https://mooseframework.org/mastodon/) - is an open source finite element tool built on top of the Multiphysics Object Oriented Simulation Environment (MOOSE; mooseframework.org)... more
Poster 238	Ridgecrest	NOTA Performance During 2019 Ridgecrest Earthquake Sequence Christian Walls, Doerte Mann, David Mencin, Kathleen Hodgkinson, Shawn Lawrence, Andre Basset, Ryan Turner, Karl Feaux, Glen Mattioli The Ridgecrest earthquake sequence occurred within the footprint of the Network of the Americas (NOTA), which federates the former EarthScope Plate Boundary Observatory, TLALOCNet in Mexico, and COCONet in the Caribbean. NOTA is operated by UNAVCO... more
Poster 147	FARM	Influence of heterogenous stress on rupture propagation along stepovers of strike-slip faults: Numerical results Hui Wang, Mian Liu, Benchun Duan, Jianling Cao Large earthquakes on intracontinental strike-slip faults usually rupture multiple fault segments by jumping over stepovers. Previous field observations and numerical modeling with a homogeneous stress field have suggested that stepovers more than ~... more
Poster 052	Seismology	Mapping Near-Surface Rigidity Structure using Co-located Pressure and Seismic Stations from the EarthScope Transportable Array Jiong Wang, Toshiro Tanimoto We propose a single-station approach to obtain shallow elastic structure by using co-located pressure and seismic instruments and apply this approach to stations in the EarthScope Transportable Array. This approach retrieves rigidity of the... more
Poster 066	Seismology	Earthquake Detection in Develocorder Films: An Image-based Detection Neural Network for Analog Seismograms Kaiwen Wang, Weiqiang Zhu, William Ellsworth, Gregory Beroza From the late 19th century into the 1970s, seismograms were almost exclusively recorded in analog form. It was not until the 1980s that digital recording began to replace analog recording. Over 100 years of analog seismograms - about 50 million -... more
Poster 234	Ridgecrest	Modeling of co- and early postseismic deformation due to the 2019 Ridgecrest earthquake sequence Kang Wang, Roland Bürgmann On July 4th, 2019, a Mw 6.4 earthquake struck the Searles Valley near the town of Ridgecrest in southern California. The Mw 6.4 earthquake was followed by a Mw 7.1 event about 30 hours later. Both the Mw 6.4 foreshock and the Mw 7.1 mainshock... more
Poster 014	GM	Inclusion of Frequency-Dependent Spatial Correlation into the SDSU Broadband Ground-Motion Generation Method Nan Wang, Rumi Takedatsu, Kim Olsen, Steven Day Seismic losses (such as disruption of distributed infrastructure and losses to portfolios of structures) are typically dependent upon the regional distribution of ground-motion intensities, rather than the intensity at only a single site. Ground... more
Poster 080	Seismology	Spatial decorrelation of tidal triggering and remote triggering at the Coso geothermal field Wei Wang, Peter Shearer, Xiaohua Xu The triggering response of seismic fault systems to short- to mid-term (i.e., seconds to months) stress fluctuations can improve our understanding of earthquake nucleation, rupture failure processes, and local stress states. Geothermal fields are... more
Poster 092	Seismology	Bayesian array-based Receiver Function (RF): Towards stable, reliable, and easy-to-interpret RFs Xin Wang, Zhong Minyan, Zhan Zhongwen Receiver function (RF) has been an indispensable tool in structural seismology. Though a variety of RF deconvolution techniques have been developed, they are mostly performed at individual station-earthquake pairs, the results of which are adversely... more
Poster 288	GM	Effects of off-fault inelasticity on near-fault directivity pulses Yongfei Wang, Steven Day Rupture directivity strongly affects spatial variations in ground-motion amplitude and duration around faults and leads to dominant pulse-like fault-normal horizontal ground motions (for prevailing subshear-rupture events) causing a large amount of... more	18204
Poster 198	SDOT	Vertical Deformation Dependency on Spatially Variable Elastic Plate Thickness Lauren Ward, Bridget Smith-Konter, Xiaohua Xu, David Sandwell Monitoring interseismic crustal deformation of the San Andreas Fault System (SAFS) through geodetic techniques provide key constraints of fault loading over a range of temporal and spatial scales. Historically, these contributions have been limited... more	19161
Poster 008	GM	Near-Source Strong Ground Motion Characteristics of the 2018 MW 6.4 Hualien Earthquake in Taiwan Zengping Wen The free-field strong ground motions recorded at 30 sites in near fault regions in the 6 February 2018 Mw 6.4 Hualien Earthquake in Taiwan were used to examine the near-source strong ground motion characteristics. The magnitude of vertical and... more
Poster 030	EFP	An Update on the Collaboratory for the Study of Earthquake Predictability (CSEP) Maximilian Werner, William Savran, Philip Maechling, Thomas Jordan, Danijel Schorlemmer, David Rhoades, Warner Marzocchi, John Yu The Collaboratory for the Study of Earthquake Predictability (CSEP) supports an international effort to conduct and rigorously evaluate earthquake forecasting experiments. CSEP has concluded its first phase of testing (CSEP1) with testing centers... more	19235, 18147
Poster 223	Ridgecrest	Detailed fracture map and orthophoto of the southern portion of the M6.4 2019 Ridgecrest Earthquake Alana Williams, Ian Pierce, Rich Koehler, Sinan Akciz, Colin Chupik, Jayne Bormann An M6.4 foreshock struck on July 3, 2019, near Ridgecrest, California, and ruptured bilaterally. The mainshock, An M7.1 event, followed this earthquake on July 5. Between July 4 and July 9, low altitude aerial photos were acquired along ~12 km of... more
Poster 203	Geodesy	Development of a slow slip catalog for the Hikurangi subduction margin, New Zealand Charles Williams, Laura Wallace, Noel Bartlow, John Haines Slow slip events (SSEs) occur frequently along the Hikurangi Margin in New Zealand, and understanding these events is critical to our understanding of interseismic coupling, plate motion budgets, and the potential for damaging earthquakes. Along the... more
Poster 240	Ridgecrest	Aftershocks of the Ridgecrest earthquake sequence on four dense fiber seismic arrays Ethan Williams, Zhongwen Zhan, Zefeng Li, Martin Karrenbach, Thomas Coleman, Lisa LaFlame, Steve Cole, Victor Yarsev Recent advances with distributed acoustic sensing (DAS) have demonstrated the ability of pre-existing telecommunications cables to be repurposed as dense arrays of linear strainmeters, effective for scalable seismic monitoring. The extensive fiber... more
Poster 188	FARM	Wedge plasticity and coupled simulations of dynamic rupture and tsunami in the Cascadia subduction zone Andrew Wilson, Shuo Ma In an elastic dislocation model, whether or not a subduction plate boundary fault breaks the trench has a significant effect on seafloor deformation and resulting tsunami. However, when inelastic deformation of the sedimentary wedge is considered,... more
Poster 016	GM	A Machine Learning Approach to Developing Ground Motion Models from Simulated Ground Motions Kyle Withers, Morgan Moschetti, Eric Thompson The USGS is working towards incorporating regionally specific seismic analyses into the U.S. National Seismic Hazard Model. The large dataset of ground motions generated from simulations can serve to supplement empirical data in areas where observed... more
Poster 119	Geology	Case Study Evaluation of the Interface Geometry on Fragility of Precarious Rock Systems Christine Wittich, M. Khalid Saifullah Reliable estimates of seismic hazard are essential for the development of resilient communities; however, estimates of rare, yet high-intensity earthquakes are highly uncertain due to a lack of observations and recordings. In the absence of... more	19113
Poster 280	Ridgecrest	Dynamic stress perturbation on the M7.1 Ridgecrest earthquake fault from the preceding M6.4 event: a theoretical study with dynamic rupture models Baoning Wu, David Oglesby, Jordan Cortez, Christodoulos Kyriakopoulos The 2019 Ridgecrest earthquake sequence included a M6.4 event and a M7.1 event occuring 33 hours apart, rupturing two perpendicular faults. Questions arise about how much the M6.4 event contributed to the M7.1 rupture. While the detailed rupture... more
Poster 086	Seismology	Characterizing earthquake source complexity in the trifurcation area of the San Jacinto fault zone Qimin Wu, Xiaowei Chen, Rachel Abercrombie It is well known that many larger earthquakes have highly complex rupture processes with significant variation in slip and stress drop over the rupture plane. As the quantity and quality of data increase, similar source complexity is being observed... more	18087
Poster 040	EFP	The seasonal variation of the geomagnetic solar daily variation field in China Yingyan Wu The geomagnetic field shows a regular diunal variation at the middle and low latitudes during geomagnetic quiet time, which is called as solar quiet daily variation (Sq). It is mainly generated from the ionosphere dynamic current system in the E-... more
Poster 258	Ridgecrest	Imaging the rupture process of the 2019 M6.4 and M7.1 Ridgecrest Earthquakes using local seismic stations in Southern California Yuqing Xie, Lingsen Meng The M6.4 and M7.1 Ridgecrest earthquakes shocked downtown LA in July 2019. The earthquakes draw many attentions since they are among the largest earthquakes in Southern California over the past two decades. They are recorded by the dense strong... more
Poster 292	EEII	Development of vulnerability surface of high-rise RC frame by means of IDA Chao Xu, Zengping Wen, Junju Xie The damage potential of strong ground motion is commonly presented by an intensity measure (IM) in vulnerability evaluation of building structures. For high-rise buildings, scalar-valued intensity measures usually hard to characterize the... more
Poster 227	Ridgecrest	Surface rupturing and triggered slip on nearby faults from the Ridgecrest earthquakes revealed by InSAR Xiaohua Xu, Lauren Ward, Bridget Smith-Konter, Chris Milliner, Peng Fang, Yehuda Bock, David Sandwell We analyzed repeat-pass Sentinel-1 and ALOS-2 synthetic aperture radar images to measure broad-area surface deformation and high-resolution surface rupturing from the combined July 4-5 2019 Ridgecrest earthquake sequence. Phase gradient maps were... more	19083
Poster 308	CEO	Developing Visualizations of Earthquake Droughts on the San Andreas Fault System Gina Yang, Joses Galdamez, Afe Addeh, Brandon O'Neil, Harsh Waghela, John Yu, Kevin Milner, Jerlyn Swiatlowski, Thomas Jordan New advances in seismic data collection and processing have highlighted the need for methods of earthquake and fault visualization packaged in interactive, user-friendly software. The Southern California Earthquake Center Virtual Display of Objects... more
Poster 177	FARM	Locating and monitoring hydraulic fracture and earthquake rupture using elastic reverse-time migration Jidong Yang Locating and monitoring passive seismic sources provides us important information for studying hydraulic fracture and earthquake rupture. In this abstract, we present a novel passive source monitoring approach using vector-based elastic reverse-time... more
Poster 071	Seismology	Evaluation of Deep, Widespread Seismicity with Long Beach Dense Array Lei Yang, Xin Liu, Weiqiang Zhu, Gregory Beroza Earthquake monitoring in urban settings is challenging due to high levels of cultural noise, yet it’s important because comprehensive and precise earthquake locations provide essential constraints on the location and geometry of active faults. Dense... more	19101
Poster 076	Seismology	Spatial and temporal evolution of seismicity, seismic velocity, and pore pressure in the Guy-Greenbrier, Arkansas, earthquake sequence Zhuo Yang, Marine Denolle Hydraulic fracturing is a widely-used technique to enhance natural gas production in northern Arkansas. The process also produces a large amount of wastewater. In the Guy-Greenbrier area in Arkansas, wastewater has been injected into the subsurface... more
Poster 159	FARM	Evidence of thermal pressurization in high-velocity friction experiments on dolerite under elevated pore pressure Lu Yao, Shengli Ma, Toshihiko Shimamoto Dynamic weakening of faults plays a key role in aiding earthquake propagation. Several mechanisms, such as frictional melting, thermal pressurization and flash heating have been suggested as major weakening mechanisms. Originally proposed through... more
Poster 090	Seismology	Numerical accuracy of staircase fluid-solid and free-surface boundary conditions for staggered-grid finite-differences Te-Yang Yeh, Kim Olsen Accurate boundary conditions along fluid-solid and free-surface interfaces are needed in wave propagation simulations where the effects from non-planar surface topography and bathymetry are non-negligible. Okamoto and Takenaka (2005) and later... more
Poster 293	EEII	Machine Learning Based Regional Seismic Retrofit Design Optimization for Soft Weak Open Front Wall Line Buildings Zhengxiang Yi, Henry Burton Policies are often enacted to mandate the retrofit of seismically vulnerable buildings. A major challenge in specifying the design requirements for policy-based retrofits is ensuring that the desired performance enhancements are achieved across a... more

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