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 301-336 of 336

SCEC ID	Category	Title and Authors	SCEC Award
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
Poster 146	FARM	Systematic variations of earthquake source time function from clustering analysis Jiuxun Yin, Zefeng Li, Marine Denolle Source Time Functions (STFs) characterize temporal evolution of moment release during earthquake rupture and exhibits tremendous inter-event variations. In this study, we introduce a Dynamic Time Warping (DTW) technique to quantitatively cluster... more
Poster 304	CEO	Earthquake Notification Service (ENS): Present Capabilities and Next-Generation Product Ideas Clara Yoon, Stan Schwarz, Valerie Thomas The USGS is planning to develop the next-generation Earthquake Notification Service (ENS). ENS, available at https://earthquake.usgs.gov/ens/, is a free USGS product that provides accurate, reliable, timely, 24/7 earthquake information to over 400,... more
Poster 130	SAFS	New interpretations at the Ranch Center and Key Slide slip rate sites, Mojave section of the San Andreas Fault, Palmdale, CA Elaine Young, Katherine Scharer, Amanda Keen-Zebert, Emery Anderson-Merritt, Eric Cowgill, Ray Weldon The Holocene slip rate on the ~100km long Mojave section of the San Andreas Fault (MSAF) is not well known, despite its importance for understanding apparent discrepancies between geologic and geodetic slip rates along this fault section and... more	17231
Poster 199	SDOT	Drought Induced Groundwater Loss in and Around Great Salt Lake, Utah, Inferred from 3D GPS Displacements Zachary Young, Corné Kreemer The American Southwest experienced a massive drought between 2011 and 2016 with significant impacts to regional water storage. During this period, the Great Salt Lake (GSL), Utah, lost 1.85 meters of water and Global Positioning System (GPS) data... more
Poster 301	CS	Cloud Computing and Big Data – Using the Southern California Earthquake Data Center (SCEDC) and the Southern California Seismic Network (SCSN) Products and Services for Earthquake Research Ellen Yu, Prabha Acharya, Aparna Bhaskaran, Shang-Lin Chen, Jennifer Andrews, Valerie Thomas, Zachary Ross, Egill Hauksson, Robert Clayton Southern California Earthquake Data Now in the Amazon Cloud • At the date of this abstract, we have uploaded one year (2016,180 to 2017,180). Efforts to load remaining years (1999-present) into the archive are are ongoing. AWS bucket name is s3... more	19061
Poster 184	FARM	Inter-event slow-slip process for the fore- to Main triggering of the 2016 Komamoto earthquake sequence PKU Yue Cascade and preparation processes could interpret the triggering between fore- and mainshocks, which determine the possibility of using foreshocks for short term predictions. Discriminate between these processes are difficult due to rare near field... more
Poster 132	SAFS	Evidence for inactivity since ~100 ka on the northern route of the San Andreas fault, southern California Doug Yule, Jonathan Matti, Katherine Kendrick, Richard Heermance From San Bernardino to Indio, CA, the San Andreas fault (SAF) follows two distinct routes. A northern route (NR) follows the Mill Creek and Mission Creek strands and a southern route (SR) follows the San Bernardino, Banning, and Garnet Hill strands... more
Poster 230	Ridgecrest	ARIA Rapid Response Products for the 2019 Ridgecrest Earthquakes Sang-Ho Yun, Jung Liang, Eric Fielding, Cunren Liang, Susan Owen, Hook Hua, Marjorie Lucas The Advanced Rapid Imaging and Analysis (ARIA) team at NASA's Jet Propulsion Laboratory in Pasadena, California, created this map depicting areas that are likely damaged as a result of the recent major earthquakes. The color variation from... more
Poster 089	Seismology	Quantifying preparation process of large earthquakes: Damage localization and coalescent dynamics Ilya Zaliapin, Yehuda Ben-Zion We attempt to track and quantify preparation processes leading to large earthquakes with data of earthquake and acoustic emission (AE) catalogs using two complementary analyses. (a) Localization of brittle deformation manifested by evolving... more	19063
Talk Tue 1030	EFP	Spatiotemporal Evolution Pattern of Seismicity across California-Nevada and Its Implication for Future Large Earthquakes Yuehua Zeng, Mark Petersen, Zheng-Kang Shen Rock mechanics studies and dynamic earthquake simulations show patterns of seismicity evolving with time through (1) accumulation phase, (2) localization phase, and (3) rupture phase. We observe a similar pattern of changes in seismicity during the... more
Poster 034	EFP	Unified hydromechanical and nucleation models for induced seismicity in Western Oklahoma and South-Central Kansas Guang Zhai, Manoochehr Shirzaei, Michael Manga Induced seismicity has expanded into south-central Kansas, an area with low risk of damaging natural earthquakes (Peterie et al., 2018, GRL). Historically, the region has an average of one M3.0+ earthquake every one or two years. The rapid increase... more
Poster 257	Ridgecrest	Automated moment tensor inversion using 3D Green’s Functions: Application to the LA basin and the 2019 Ridgecrest sequence Zhongwen Zhan, Xin Wang Earthquake focal mechanisms put primary control on the distribution of ground motion, and also bear on the stress state of the crust. Most routine focal mechanism catalogs still use 1D velocity models in inversions, which may introduce large... more	19011
Poster 088	Seismology	Resolving the spatiotemporal variability of small earthquake source parameters at Parkfield and their relationship with 2004M6 Parkfield earthquake Jiewen Zhang, Xiaowei Chen, Rachel Abercrombie Parkfield has long been a natural, well-studied laboratory for investigating spatial and temporal changes in fault properties and their relation to large earthquakes. Previous studies have found possible changes in stress drop for small events with... more
Poster 006	GM	Developing a 3-D crustal velocity model for central Oklahoma Shuo Zhang, Hejun Zhu During the last decade, there are increasing numbers of earthquakes recorded in Oklahoma, most of which are small earthquakes. In order to study these earthquakes, a lot of local station networks have been deployed in this region, such as GS, YW, OK... more
Poster 181	FARM	Evaluating Seismicity Patterns in Western China Yingying Zhang, Walter Mooney Ebel and Chambers (2016) found that some modern M ≥ 4.0 earthquakes in California and Nevada preferentially occurred at the ends of 19th and 20th century Mw ≥ 6.5 fault ruptures, and the focal mechanisms were the same as the earlier main shock.... more
Poster 031	EFP	CSEP2 from China Perspective Yongxian Zhang, Zhongliang Wu, Xiaodong Zhang, Huaizhong Yu, Shengfeng Zhang, Xiaotao Zhang, Chen Yu, Chaozhong Hu Recently, a China-US cooperation project named “CSEP China in the Context of China Seismic Experimental Site (CSES)” was approved by the Ministry of Science and Technology, China which is led by Yongxian Zhang at CENC and Emily Brodsky at UCSC and... more
Poster 046	Seismology	Updating the Caltech Millkan Shaker for time-lapse seismic imaging in Southern California Yuling Zhang, Ethan Williams, Valere Lambert, Zhongwen Zhan Ambient noise interferometry has been invaluable in shallow subsurface imaging. However, in Southern California, rapidly evolving noise sources can lead to spurious velocity changes, posing substantial challenges for time-lapse investigations such... more
Poster 102	Geology	The Holocene paleoearthquakes on the 2014 Kangding Ms6.3 earthquake faults Hu Zhong On November 22, 2014, a Ms6.3 earthquake occurred in Kangding, Sichuan Province. After the field survey of fracture in this region, the Selaha segment of Xianshuihe fault zone is confirmed as the earthquake fault based on comprehensive research of... more
Poster 187	FARM	Evolving seismic and aseismic slip on a heterogeneous frictional fault with heat generation and temperature-dependent creep Bruce Zhou, Iain Bailey, Yehuda Ben-Zion We study the evolution of seismicity and seismic/aseismic slip partitioning on a fault using a generalized version of the Ben-Zion and Rice (1993) model for a discrete cellular fault in elastic halfspace. Previous versions of the model were shown to... more
Poster 026	EFP	MC-QSim -- Introducing a new multi-cycle earthquake rupture simulator Olaf Zielke, Paul Martin Mail With this abstract, we introduce MC-QSim, a newly formulated multi-cycle earthquake rupture simulator for the generation of long sequences of earthquakes along arbitrarily complex fault geometries with heterogeneous distributions of fault... more
Poster 226	Ridgecrest	Three-dimensional rupture patterns of the 2019 Ridgecrest, California earthquake sequence revealed by correlation of high-resolution WorldView optical satellite imagery Robert Zinke, James Hollingsworth, Gilles Peltzer, Eric Fielding, James Dolan, Chris Milliner, Yousef Bozorgnia, Alexandra Sarmiento We measure horizontal and vertical surface deformation from the 4 July 2019 MW 6.4 and 5 July 2019 MW 7.1 earthquake sequence near Ridgecrest, CA using correlation of high-resolution WorldView optical satellite imagery. Specifically, we correlated... more

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