Meeting Abstracts | Southern California Earthquake Center

SCEC2021 Meeting Abstracts

SCEC Annual Meeting participants are invited to share recent results and activities relevant to SCEC priorities and initiatives during the poster sessions. 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 search form to view abstracts of presentations that have been accepted for this meeting.

Results 251-292 of 292

SCEC ID	Category	Title and Authors	SCEC Award
Poster 131	FARM	The role of partial ruptures in the observed moment-recurrence scaling of repeating earthquakes Alice Turner, Jessica Hawthorne Repeating earthquakes are thought to represent the repeated rupture of loaded patches surrounded by regions that are slipping aseismically; they provide a natural laboratory to study interactions between seismic and aseismic processes. These events... more
Poster 019	CXM	Community Geodetic Model: Current status of the consensus InSAR model for deformation time series and velocities in Southern California Ekaterina Tymofyeyeva, Michael Floyd, David Bekaert, Gareth Funning, Katherine Guns, Zhen Liu, Kathryn Materna, David Sandwell, Kang Wang, Xiaohua Xu The Community Geodetic Model (CGM; https://www.scec.org/research/cgm) aims to create a consensus model of the crustal motions in Southern California at high spatiotemporal resolution, and provide the model as a product that is accessible to the... more
Poster 223	Seismology	Quantification of the Complexities in Rupture Processes of Small Earthquakes by Multiple Spectral Ratio Analyses Takahiko Uchide The earthquake source processes have been characterized by seismological data analysis such as finite-fault slip inversion analyses and back-projection analyses, although the resolution is limited. Some earthquakes are unilateral, while some others... more
Talk 14-Sep (15:00)	FARM	Unraveling the mechanics of multi-fault earthquakes using realistic 3D dynamic rupture models, unifying interdisciplinary geophysical observations: the 2019 Ridgecrest sequence Thomas Ulrich, Taufiq Taufiqurrahman, Alice-Agnes Gabriel, Duo Li, Bo Li, Sara Aniko Wirp, Sara Carena, Alessandro Verdecchia, Frantisek Gallovic The July 4 and 5, 2019, Mw6.4 and Mw7.1 Ridgecrest, California events are prominent additions to a long series of multi-fault earthquakes (such as the 1992 Landers, 2010 Haiti, 2010 El Mayor‐Cucapah, 2016 Kaikoura events), which suggest that such... more
Talk 13-Sep (11:00)	Seismology	The challenges (and solutions) of using fibre-optic cables as seismological antennas Martijn van den Ende, Jean-Paul Ampuero Fibre-optic Distributed Acoustic Sensing (DAS) is an emerging technology that enables the recording of ground motions with fibre-optic (telecommunication) cables. Since these cables can be deployed in environments that are traditionally challenging... more
Poster 258	EFP	Communicating Aftershock Forecasts for Situational Awareness During Humanitarian Response Nicholas van der Elst, Sara McBride, Jeanne Hardebeck, Andrew Michael, Morgan Page The USGS provides aftershock forecasts to USAID Bureau of Humanitarian Assistance (BHA) after major international earthquakes to promote situational awareness when a US response may be required. The forecasts are based on the Epidemic-Type... more
Poster 162	FARM	Self-similar fault slip in response to fluid injection Robert Viesca There is scientific and industrial interest in understanding how geologic faults respond to transient sources of fluid. Natural and artificial sources of fluid can elevate pore fluid pressure on the fault frictional interface, which may induce slip... more
Poster 219	Seismology	3D Basement-Depth Map for the San Gabriel, Chino, and San Bernardino Basins Valeria Villa, Yida Li, Ritu Ghose, Robert Clayton, Patricia Persaud The San Gabriel, Chino, and San Bernardino sedimentary basins in Southern California amplify earthquake ground motions and prolong the duration of shaking due to the basin’s shape and the low seismic velocities of the soft sediments. In the event of... more	19061
Poster 024	CS	Implementing and Benchmarking Poroelasticity in PyLith Robert Walker, Brad Aagaard, Matthew Knepley, Charles Williams PyLith, a community, open-source code (https://geodynamics.org/cig/software/pylith/) for modeling quasi-static and dynamic crustal deformation with an emphasis on earthquake faulting, has recently been expanded to allow for the flexible... more
Poster 157	FARM	Crack-like and pulse-like ruptures, seismic swarms, and tremorgenic slow-slip events in velocity-weakening, temperature-strengthening faults Binhao Wang, Sylvain Barbot The evolution of frictional resistance on faults largely affects the style and characteristics of seismic ruptures. A wide range of rupture styles, from slow-slip events to fast earthquakes, can be explained under isothermal rate- and state-... more
Poster 210	Seismology	Dynamic Triggering Cases at the Salton Sea Geothermal Field Cameron Wang, Wenyuan Fan, Jianhua Gong Earthquakes can trigger other earthquakes at different faults that may be hundreds or even thousands of kilometers away. Such correlated triggering processes are caused by passing seismic waves and are termed as dynamic triggering. Dynamic... more
Poster 207	Seismology	New insights into the Rangely earthquake control experiment Kaiwen Wang, Gregory Beroza, William Ellsworth The Rangely experiment was the first experiment to control the occurrence of earthquakes deliberately by varying fluid injection. It was conducted in an anticlinal oil field at Rangely, Colorado in 1970s. Due to its controlled nature and to the... more
Poster 261	EFP	Role of fault maturity on relationship of surface displacement and rupture length Yongfei Wang, Christine Goulet Following the pioneering work from Scholz (1982) who noted that fault ruptures can extend to lengths far beyond seismogenic depths, scientists have proposed multiple theories and models to provide an explanation, relating fundamental fault rupture... more
Poster 224	Seismology	A Detailed Earthquake Catalog for the San Jacinto Fault‐Zone Region in Southern California and the period 2008-2020 Malcolm White, Yehuda Ben-Zion, Frank Vernon Earthquake catalogs are foundational data products for earthquake science. White et al (2019) developed an automated processing procedure to derive a catalog of earthquake hypocenters from raw waveform data and applied it to nine years of archived... more
Poster 166	FARM	Optimizing Numerical Simulations of Earthquake Sequences Including Off-Fault Viscoelastic Deformation using Hierarchical Matrices Joseph Wick, Valere Lambert Deformation along faults is observed to be highly localized within Earth’s upper crust, although less is known about the nature of fault shear zones at depth. Simulations of sequences of earthquakes and aseismic slip (SEAS) can provide insight into... more
Poster 095	SAFS	Earthquake Chronology of the Parkfield-Cholame Transition Zone: San Andreas Fault Alana Williams, gordon seitz, Thomas Rockwell, Douglas Cook, Ramon Arrowsmith We completed a paleoseismic investigation of the Parkfield/Cholame SAF segment transition in August 2020 funded largely by Caltrans in collaboration with CGS, ASU and SDSU. Radiocarbon, OSL and pollen chronology was funded by SCEC and we anticipate... more
Poster 117	SDOT	Understanding Crustal Stress Heterogeneity in the Los Angeles Region using Focal Mechanism Inversions and Shear Wave Splitting Fast Velocities Leora Wilson, Karen Luttrell, Jeanne Hardebeck The Los Angeles region of southern California is structurally complex with demonstrated heterogeneity in crustal stress orientation. Maximum horizontal compression azimuth (SHmax) can be calculated from focal mechanism inversion, inferred from... more
Poster 035	GM	Generation of Broadband Ground Motion from Dynamic Rupture Simulations: A Group Modeling Approach towards better Characterizing Seismic Hazard for Engineering Applications Kyle Withers, Shuo Ma, Yongfei Wang, Thomas Ulrich, Dunyu Liu, Benchun Duan, Alice-Agnes Gabriel, Jean-Paul Ampuero, Elif Oral, Luis Dalguer, Christine Goulet, Domniki Asimaki We work towards improving methods of simulating earthquake ground motions for seismic hazard applications by continuing a newly formed group modeling effort that incorporates features of the earthquake fault and rupture (e.g., through complex fault... more	21010, 20046, 19077
Poster 081	Geology	Shake Table Tests and Numerical Modeling for Precarious Rock Fragilities Christine Wittich, Muhammad Khalid Saifullah A precariously balanced rock (PBR) is an individual or group of rocks that has eroded into an unstable configuration. Given that the ages of many of these features have been established to be in excess of 10 – 30 ka, precarious rocks and other... more	20106
Poster 066	Geology	Kinematic evolution of the Palos Verdes restraining bend and 3-D architecture of the fault, Southern California Franklin Wolfe, John Shaw, Andreas Plesch The Palos Verdes Fault Zone (PVFZ) extends across the southwestern Los Angeles Basin and Inner Continental Borderland, California, and is considered capable of generating large, damaging earthquakes with short recurrence intervals. The 110-km-long... more
Poster 240	Seismology	Kinematic rupture model for the 2017 Mw 5.5 Pohang, South Korea, earthquake Jeongung Woo Analyzing the faulting process of induced and triggered earthquakes at many unconventional hydrocarbon sites is one of the integral parts to better understand their causes, potentially related to the pre-event seismicity, aftershock activity and the... more
Poster 151	FARM	Scaling of the solution in an elastodynamic rupture problem: an analytical proof Baoning Wu, David Oglesby, Christodoulos Kyriakopoulos, Jennifer Tarnowski It has long been known that the solution of an elastodynamic earthquake rupture problem scales with some initial stress and friction parameters. For a dynamic rupture model with a slip-weakening friction law, if we scale the initial stress and slip... more
Poster 242	Seismology	Source complexity of small and moderate earthquakes in the 2019 Ridgecrest earthquake sequence Qimin Wu, Xiaowei Chen 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	21032, 21169
Poster 235	Seismology	Earthquake strain sensing using optical fiber interferometers Surui Xie, Mark Zumberge, Rob Mellors Two horizontal (trench lengths: 200 and 225 m) and one vertical (borehole depth: 250 m) stretched optical fiber strainmeters (OFS) were developed to measure Earth strain by monitoring laser light interferometrically. These OFSs are capable of... more
Poster 023	CS	Causal Graph-based Joint Estimation of Ground Failure and Building Damage from Geospatial Prior Models and Satellite Imagery Susu Xu, Joshua Dimasaka, David Wald, Haeyoung Noh Rapid post-earthquake modeling and reconnaissance are important for response, recovery, and scientific endeavors by providing accurate and timely information concerning primary and secondary hazards and impacts, including faulting, landsliding,... more
Poster 098	Geodesy	Strain rate mapping along the San Andreas fault system with integrated InSAR and GNSS time-series Xiaohua Xu, David Sandwell, Emilie Klein, Yehuda Bock Measuring crustal strain and seismic moment accumulation is crucial for understanding the growth and distribution of seismic hazards along major fault systems. In order to do that, it is important to acquire an accurate estimate of the present-day... more	20074
Talk 15-Sep (11:00)	Geodesy	Mapping faults from space with InSAR: Ridgecrest and beyond Xiaohua Xu, David Sandwell, Lauren Ward, Chris Milliner, Bridget Smith-Konter, Peng Fang, Yehuda Bock One of the most important objectives in tectonic geodesy is to estimate the magnitude of off-fault deformation, which relies heavily on an understanding of how strain is distributed in the crust and the ability to precisely detect mm-scale... more	19083
Poster 192	Seismology	Mapping LA basin depth with converted seismic phases Yan Yang, Robert Clayton Sedimentary basins trap and amplify earthquake ground motion energy. One of the most important basin structure parameters is the depth-to-basement. The mapped depth-to-basement of the densely populated Los Angeles Basin is usually largely smoothed... more
Poster 179	Seismology	Effect of Porosity and Permeability Evolution on Injection-Induced Aseismic Slip Yuyun Yang, Eric Dunham It is widely recognized that fluid injection can trigger aseismic fault slip. However, the processes by which the fluid-rock interactions facilitate or inhibit slip are poorly understood and some are oversimplified in most models of injection-... more
Poster 049	GM	3D wave propagation simulations of the 2019 M7.1 Ridgecrest, CA, Earthquake Te-Yang Yeh, Kim Olsen We have performed 3D numerical wave propagation simulations for the July 6 2019 M7.1 Ridgecrest, CA earthquake. The purpose of this study is to use a state-of-the-art 3D simulation tool to better understand how different parts of calculations... more	21111
Poster 197	Seismology	Separation of seismic signal and ambient noise using deep neural network Jiuxun Yin, Marine Denolle, Bing He Earthquake signals in seismic data are inevitably contaminated with signals from unwanted sources. Separating noise from earthquake signals can greatly improve seismic data analysis, such as earthquake characterization and ambient noise analysis.... more
Poster 067	Geology	Effectiveness and reproducibility of remote mapping of the 2019 Ridgecrest earthquake ruptures with airborne lidar and imagery Elaine Young, Michael Oskin, Alba Rodriguez Padilla Remote rupture maps are useful contributions to earthquake response, probabilistic fault displacement hazard analysis, and as training datasets for remote mapping with artificial intelligence. We use post-earthquake lidar data to remotely map... more	20155
Poster 200	Seismology	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, Allen Husker, Egill Hauksson, Robert Clayton The Southern California Earthquake Data Center (SCEDC) is the archive of the Southern California Seismic Network and makes all data recorded by the network available to researchers and the public. The poster will present recent developments of... more	21048
Poster 087	SAFS	Where's the slip? No slip in at least 40,000 years on northern-route strands of the San Andreas fault northwest of the Indio Hills, southern California Doug Yule, Jonathan Matti, Katherine Kendrick, Richard Heermance Large throughgoing earthquakes linking Coachella Valley and Mojave Desert segments of the San Andreas fault (SAF) must navigate the complex San Gorgonio Pass (SGP) region. Here, the fault follows two routes. Southern-route (SR) faults have youthful... more
Poster 251	EFP	Earthquake clustering and localization of seismicity before large events Ilya Zaliapin, Yehuda Ben-Zion We present recent results focused on assessing the degree of regional clustering of earthquakes and progressive localization of seismicity in relation to the earthquake cycle. First, we demonstrate that events included in the existing short-duration... more	21041
Poster 163	FARM	Slow Faulting Induced by Subcritical Crack Growth at High Pore Fluid Pressures Zachary Zega, Wen-lu Zhu Under drained conditions, low-temperature brittle deformation depends primarily on the difference between the confining and pore fluid pressures (differential pressure) and not the magnitude pore fluid pressure. Laboratory experiments have shown... more	21157
Poster 205	Seismology	Subsurface seismic properties across the southern San Andreas Fault in the Thousand Palms Canyon based on train-generated seismic waveforms Hao Zhang, Haoran Meng, Yehuda Ben-Zion We use seismic waveforms generated by freight trains in the Coachella Valley and recorded by dense seismic array sensors to image the shallow structure of the Southern San Andreas Fault Zone (SoSAFZ). The array was deployed for one month with 322... more
Poster 260	EFP	Conducting a forward long-to-intermediate-term forecast and evaluation in the Yunnan-Sichuan region in China Shengfeng Zhang, Yongxian Zhang, Zhongliang Wu Since the initial international cooperation in Collaboratory for the Study of Earthquake Predictability (CSEP) in 2007, Pattern Informatics (PI) algorithm and Relative Intensity (RI) algorithm has been widely used in many global regions. These... more
Poster 268	EFP	Progress of CSEP China Yongxian Zhang, Huaizhong Yu, Shengfeng Zhang, Yue Liu, Hui Wang, Xiaotao Zhang, Chen Yu, Zhengyi Yuan, Chaozhong Hu, Guiping Liu, Jianchang Zheng, Jun Zhong, Gang Li, Xiaodong Zhang, Xiqiang Liu, Zijian Cui, Zhenyu Zou, Zhengshuai Zhang, Huajian Cui, Dongmei Li, Guoyi Li, Xiaoyi Fan, Zonghui Dai Due to the impact of COVID-19, we applied to the Ministry of Science and Technology for one year’s extension of the project in July 2020. Till July 2021, our application was approved by the Ministry of Science and Technology, and the execution... more
Poster 148	FARM	Simulations of localization process leading to large earthquakes Bruce Zhou, Jessica McBeck, Francois Renard, Yehuda Ben-Zion Recent work of Ben-Zion & Zaliapin (2019, 2020) show that large events (M>7) such as the Landers 1992, Hector Mine 1999, and Ridgecrest 2019 earthquakes in Southern California were preceded by localization processes of background seismicity... more
Poster 226	Seismology	Foreshock Sequence of the 2021 Mw6.1 YangBi Earthquake Sequence, Yunnan, China: Not a Triggered Cascade Yijian ZHOU, Abhijit Ghosh, Lihua FANG, Han YUE, Shiyong ZHOU The 2021 Mw6.1 YangBi earthquake occurs near the southwest boundary of Chuandian block, Yunnan, China. The mainshock is preceded by three major foreshocks: 05-18 Mw4.3 (f1), 05-19 Mw4.6 (f2), and 05-21 Mw5.2 (F). This foreshock sequence provides a... more
Poster 232	Seismology	High-resolution Ambient Noise Tomography of Shallow Fault Zones Along the July 2019 Ridgecrest Ruptures Zheng Zhou, Michael Bianco, Peter Gerstoft, Kim Olsen We perform ambient noise tomography (ANT) using data recorded on 342 seismographs within a 50x50 km area inside which the July 2019 M7.1 and M6.4 Ridgecrest earthquakes occurred. We used the locally sparse tomography (LST) method, an unsupervised... more

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SCEC2021 Meeting Abstracts

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