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 101-150 of 248

SCEC ID	Category	Title and Authors	SCEC Award
Poster 176	CXM	Oblique-rifting and evolution of southern California fault systems Mark Legg, Marc Kamerling Oblique-rifting has produced complex faulting and ridge and basin systems along the southwestern North America continental margin. Predominant NW-trending structure parallels the relative motion of the Pacific Plate away from the former North... more	20117, 19205
Poster 056	Seismology	Temporal Changes of Seismicity in Salton Sea Geothermal Field with Waveform-matched Catalog Chenyu Li, Zhigang Peng, Dongdong Yao, Xiaofeng Meng The Salton Sea Geothermal Field (SSGF) is one of the most seismically active and geothermally productive fields in Southern California. It is bounded by the Southern San Andreas Fault to the NE, and the Imperial Fault, and Cerro Prieto Fault to the... more	15077
Poster 078	Seismology	Moment tensor inversion for deep earthquakes at the Tonga-Kermadec subduction zone using 3-D Green’s functions Xueyan Li, Hejun Zhu Seismic moment tensors from the Global CMT catalog have been widely used to infer source mechanisms and physical properties around local regions where earthquakes occur. However, the zero-trace constraint used in the source inversion algorithm may... more
Poster 048	Seismology	Scattering in the Ambient Noise Correlations in the San Gabriel Basin Yida Li, Robert Clayton, Patricia Persaud One fundamental assumption of ambient noise correlations is that the noise source is distributed homogeneously in the far field. However, we sometimes observe apparent near field scattering in the correlations. These can be caused by reflections of... more
Poster 230	EEII	Guidelines on Utilization of Simulated Ground Motions for Engineering Building Response Applications Ting Lin, Gregory Deierlein, Jack Baker, Farzin Zareian This paper provides guidelines on the utilization of simulated earthquake ground motion time series for engineering building response applications based on research conducted in the Southern California Earthquake Center (SCEC) Ground Motion... more	19173
Poster 032	SAFS	Observation-constrained multicycle dynamic models of southern San Andreas fault and the San Jacinto fault: the effect of the Big Bend and Cajon Pass on rupture dynamics Dunyu Liu, Benchun Duan Macroscopic fault geometrical complexities such as restraining bends and stepovers, i.e., earthquake gates, show impediments to earthquake dynamically propagating ruptures. Earthquake gates are common in natural fault systems and they occasionally... more	20138, 19238
Poster 040	Seismology	Ambient noise attenuation tomography of Love & Rayleigh waves applied to the Ramona reservation linear array across the San Jacinto Fault Zone Xin Liu, Gregory Beroza, Yehuda Ben-Zion We study the near-surface fault zone structure from ambient seismic noise data. The amplitude of the seismic wavefield contains information on seismic attenuation, which is sensitive to fault damage zone characterized by well-developed fractures... more
Poster 190	CS	Software Containers and Version Control for High Performance Computing Applications Liberty Locsin, Scott Callaghan Software is where the computational models that aid scientific analysis exist. Due to the complexity of some scientific software applications, software may require specialized parallel high performance computing (HPC) environments such as... more
Poster 111	Geodesy	Impact of intermittent decorrelation events on InSAR time series, with application to the Salton Trough, CA Rowena Lohman, Junle Jiang InSAR time series in agricultural regions have long been recognized to be strongly affected by cultivation and vegetation growth. Variations in soil moisture and vegetation can negatively impact data quality and also can affect the interferometric... more	20139
Poster 226	GM	Database of geotechnical shear-wave seismic-velocity profile measurements for California and Nevada John Louie, Alexander Simpson, Jacob Ortega The time-averaged seismic shear-wave velocity from the surface to 30 m (100 ft) depth, defined in the Building Code as Vs30, is in the United States one of the principal determinants of earthquake site-hazard classification. Over the past 20 years... more	10062, 08159, 05046
Poster 160	FARM	Dynamic rupture modeling of coseismic interactions on orthogonal strike-slip faults Julian Lozos The San Andreas Fault System is dominated by right-lateral strike-slip faulting. However, a large number of smaller orthogonal left-lateral structures also exist. Some, such as the Garlock Fault or Pinto Mountain Fault, are large enough to be mapped... more	20204
Poster 036	Seismology	Validation of seismic velocity models in southern California with full-waveform simulations Yang Lu, Yehuda Ben-Zion Crustal seismic velocity models provide essential information for many applications, including earthquake source properties, simulations of ground-motion and related derivative products. It is therefore important to validate velocity models by... more
Poster 079	Seismology	Detection and location of aftershocks of the 2020 Western Idaho earthquake using neural networks Bingxu Luo, Hejun Zhu, Jidong Yang Aftershocks are small earthquakes that follow the mainshock. Typically, hundreds to thousands of aftershocks occur following large earthquakes, but most of them have relatively small magnitudes, making them difficult to be detected. Traditional... more
Poster 125	SDOT	Reconciling crustal stress heterogeneity from borehole breakouts and earthquake focal mechanisms Karen Luttrell, Jeanne Hardebeck Observations of crustal stress orientation from the regional inversion of earthquake focal mechanisms often conflict with those from borehole breakouts, possibly indicating local stress heterogeneity, either laterally or with depth. To investigate... more	20135, 18148, 17174
Talk	Geology	Fault displacement hazard from the asset owner’s perspective Christopher Madugo, Stephen Thompson, Ozgur Kozaci The expansive footprint of distributed infrastructure such as pipelines, canals and transportation corridors makes these assets vulnerable to fault displacement hazard in tectonically active regions like California. In the last decade, fault rupture... more
Poster 187	CXM	Developing Web-based Visualization and Query Tools for the SCEC CVM, CFM, GFM, and CTM Community Models Philip Maechling, Mei-Hui Su, Elizabeth Hearn, Scott Marshall, Andreas Plesch, John Shaw, Michael Oskin, Laurent Montesi, Edric Pauk, Tran Huynh, Yehuda Ben-Zion Our SCEC research group is developing a collection of community models that describe a wide range of features of the southern California lithosphere and asthenosphere. The geophysical properties defined by these models, collectively referred to as... more
Poster 118	SDOT	Finite source modeling of the 2019 Ridgecrest aftershock sequence Jose Magana, Douglas Dreger, Taka'aki Taira The connection between the strength of tectonic faults and the earthquake rupture is central to studies of the physics of earthquakes. Ross et al. [2019] report that much of the sequence occurred on a complex network of orthogonally oriented faults... more	20073
Poster 135	FARM	Analysis of fault-tip structures at seismogenic and creeping faults Sofia Marino, Alba Rodriguez Padilla, Michael Oskin Seismogenic faults grow coseismically through the propagation of earthquake slip to the surface, and are subject to episodic stress over the earthquake cycle. Conversely, faults creeping at steady rates experience a continuous delivery of stress to... more
Poster 123	SDOT	A decade of geodetic deformation linked to fluid injection at the North Brawley Geothermal Field Kathryn Materna, Andrew Barbour, Junle Jiang, Mariana Eneva The North Brawley Geothermal Field, located within the Brawley Seismic Zone of Southern California, has utilized binary cycle power generation to produce more than 30 MWe since 2009. The field has been associated with both aseismic ground... more
Poster 080	Seismology	Lower limit of seismogenic zone beneath Japan based on hyopocenter catalog determined with 3D seismic velocity structure Makoto MATSUBARA, Tomoko Yano, Hiroshi Sato Japanese Islands are marked by ongoing crustal deformation and seismic activity owing to the subduction of the oceanic plates; Pacific (PAC) and Philippine Sea plates. Earthquakes within the overlying plate are significant sources of seismic hazards... more
Poster 119	SDOT	Measuring uncertainty in surface strain rates in Southern California using multiple methods and elastic models. Jeremy Maurer, Kaj Johnson Geodetic data can be used to infer surface strain rates, which are correlated with seismic hazard (e.g. Savage & Simpson, 1997; Bird, 2015). Using strain-rate to infer hazard benefits from making no assumptions about faults; however, challenges... more	20156
Talk	FARM	Earthquake initiation and foreshocks informed by 3-meter rock experiments Gregory McLaskey I describe the mechanics of foreshocks and the information they might provide about an impending larger earthquake. The work is informed by 3-meter laboratory rock experiments. I present two plausible scenarios which lead to different... more
Poster 003	Geology	NEW 10BE SURFACE EXPOSURE AGES AND FAULT SLIP RATES, CUCAMONGA FAULT, SOUTHERN CALIFORNIA Devin McPhillips Several generations of alluvial fans at Day Canyon host some the best preserved scarps of the Cucamonga Fault. This fault is part of the Sierra Madre fault system on the southern border of the Transverse Ranges, which has generated damaging... more
Poster 035	Seismology	Analysis of seismic signals generated by vehicle traffic with application to derivation of subsurface Q values Haoran Meng, Yehuda Ben-Zion, Christopher Johnson Correct identification and modeling of ground motion sources are important for many studies including detection of small earthquakes and seismic imaging. To understand signals generated by common vehicle traffic, we use seismic data recorded at two... more
Poster 219	GM	A Nonergodic Ground Motion Model in Southern California with Spatially Varying Coefficients Using a SCEC CyberShake Dataset Xiaofeng Meng, Christine Goulet, Kevin Milner, Scott Callaghan A key input to probabilistic seismic hazard analyses (PSHA) is the total standard deviation of the misfits between ground motion observations and the median ground motion models (GMMs, a.k.a GMPEs). The most promising way to reduce hazard is to... more
Poster 108	Geodesy	Development of a Geodetic-based Probabilistic Fault Displacement Hazard Analysis Using Near-field Geodetic Imaging Data Chris Milliner, Jean-Philippe Avouac, Rui Chen, Saif Aati, Brian Chiou, Andrea Donnellan, Timothy Dawson, James Dolan Understanding how inelastic, co-seismic shear strain attenuates with distance away from the primary fault rupture is important for accurately characterizing the hazard it poses to critical infrastructure and estimating the full geologic slip rate.... more	19222
Poster 168	FARM	Multi-fault rupture plausibility inferences from a deterministic earthquake simulator Kevin Milner, Bruce Shaw, Thomas Jordan Enumeration of the set of all plausible significant earthquakes (i.e., those likely to damage the built environment or result in casualties) in a region is a key step when building an earthquake rupture forecast (ERF) for probabilistic seismic... more	20118
Poster 178	CXM	Shear zone rheology: Importance or fabric in the context of the CRM Laurent Montesi, Greg Hirth, Mark Behn, William Shinevar, Michael Oskin Loading of faults throughout Southern California depends on how stress is transferred from global mantle convection and plate tectonic processes to the regional and local scale. An important aspect of this transfer is the rheology of the rocks... more	19145, 20084
Poster 018	Geology	Quantifying fault displacement via optical image correlation using structure-from-motion orthomosaics in the 2019 Ridgecrest earthquake sequence Alex Morelan, Kenneth Hudnut, Andrea Donnellan Optical image correlation has proven to be a valuable technique for mapping faults and quantifying displacements in the aftermath of surface-rupturing earthquakes. The traditional application of optical image correlation relies on precisely... more
Poster 057	Seismology	The 2020 M6.5 Monte Cristo Range, NV Earthquake and Aftershock Sequence Emily Morton, Christine Ruhl, Ken Smith, Jayne Bormann, Rachel Hatch, Gene Ichinose The M6.5 Monte Cristo Range (MCR) earthquake occurred on 15 May 2020 at 11:03:27.176 UTC, in an uninhabited region approximately 50 km WNW of Tonopah, NV, within the Mina Deflection structural domain of the Central Walker Lane. No apparent... more
Talk	Seismology	The Future is Now for AI in Earthquake Monitoring S. Mostafa Mousavi During the past 10 years, there has been an enormous increase in the volume of data being generated by the seismological community. Each year, more than 50 terabytes of seismic data are archived at the Incorporated Research Institutions for... more
Talk	SDOT	Millennial to million year slip-rate variations on active faults Vasiliki Mouslopoulou, Andy Nicol, John Walsh Fault growth is typically achieved by discrete increments of slip which accrue during earthquakes. Comparison of geologically short-term (200 yrs to 20 kyr) displacements from individual earthquakes or active scarps with geologically long-term (>... more
Poster 172	CXM	A Level-Set Approach to Parsimoniously Updating the SCEC CVMs Jack Muir, Robert Clayton, Victor Tsai Effectively combining local high-resolution tomographic results with existing regional models presents an ongoing challenge as the SCEC community velocity models (CVMs) continue to mature. Currently extant boundaries between high and low resolution... more	20024
Poster 130	FARM	Slip distribution controlled by inherited fault geometry during the 2019 M7.1 Ridgecrest earthquake Johanna Nevitt, Benjamin Brooks, Jeanne Hardebeck, Brad Aagaard Though fundamental to mitigating seismic hazards, forecasting fault slip distributions remains a significant challenge due largely to mechanical and geometric crustal heterogeneities. During the 2019 M7.1 Ridgecrest earthquake, anomalously high... more
Poster 228	GM	Full Waveform Seismic Tomography for geophysical velocity model in South Island region, New Zealand based on Adjoint-Wavefield method Trung Dung Nguyen, Robin Lee, Brendon Bradley, Robert Graves In this poster we present the results of applying Full Waveform Tomography (FWT), based on the Adjoint-Wavefield (AW) method, to iteratively invert a 3-D geophysical velocity model for the South Island region (Eberhart-Phillips et al., 2010). The... more
Poster 182	CXM	Updates, Evaluation and Improvements to the Community Fault Model (CFM version 5.3) Craig Nicholson, Andreas Plesch, Christopher Sorlien, John Shaw, Egill Hauksson Although the Community Fault Model (CFM) is one of the most mature modeling efforts within SCEC, we continue to update, expand and improve the CFM 3D fault set for SCEC5. Since 2018, over 60 new or revised 3D fault representations have been added to... more	20047, 20081
Poster 224	GM	The effects of basin and source geometry on earthquake ground motions in foreland-basin settings Aisling O'Kane, Alex Copley Rapid urban growth has led to large population densities in foreland basin regions, and therefore a rapid increase in the number of people exposed to hazard from earthquakes in the adjacent mountain ranges. It is well known that ground shaking is... more
Poster 098	EFP	Statistical monitoring and early forecasting of earthquake sequence: Case studies after the 2019 M6.4 Searles Valley Earthquake, California Yosihiko Ogata, Takahiro Omi This presentation considers the possible implementation of operational short-term forecasting and analysis using a real-time hypocenter catalog of ongoing seismic activity anywhere worldwide. by reviewing case-studies of the aftershocks of M6.4... more
Poster 159	FARM	Modeling and observing supershear rupture: insufficient information from the presence of a daughter crack David Oglesby, Feng Hu, Baoning Wu, Xiaofei Chen Supershear rupture propagation (i.e., the propagation of an earthquake rupture at a speed higher than that of the shear wave in the local earth material) has long been theoretically predicted, and has been observed in an increasing number of recent... more
Poster 049	Seismology	Monitoring seismic velocity changes in 18 years at Parkfield using ambient seismic noise Kurama Okubo, Marine Denolle Both transient tectonic events such as fast and slow earthquakes, non-volcanic tremors, and periodic deformation caused by tidal and thermoelastic strains play a role in the evolution of seismic velocity change (dv/v) around faults. Our study aims... more
Poster 225	GM	Deep Learning for Site Response Estimation from Geotechnical Array Data Kim Olsen, Daniel Roten Ground motions recorded on vertical arrays show that theoretical methods for site response prediction frequently fail to reproduce the observed surface-to-borehole amplification function due to modeling simplifications. We propose to improve site... more
Poster 024	SAFS	Geomorphic and paleoseismic trenching evidence that the Glen Helen fault has not experienced surface rupture in the past 2000 years, and implications for slip transfer between the San Andreas and San Jacinto fault zones. Nate Onderdonk, Drake Kerr, Paula Figueiredo Paleoseismic data and modeling studies suggest that some ruptures through the Cajon Pass area in the past 2000 years have propagated from the San Jacinto fault zone to the San Andreas fault zone, or vice versa. The San Jacinto fault zone splits into... more	19132
Poster 099	EFP	Aftershocks Preferentially Occur in Previously Active Areas Morgan Page The clearest statistical signal in aftershock locations is that most aftershocks occur close to their mainshocks. More precisely, aftershocks are triggered at distances following a power-law decay in distance (Felzer and Brodsky, 2006). This... more
Poster 188	CXM	Physical Velocity Models for Southern California by 3D Printing Sunyoung Park, Changsoo Shin, Younglib Kim, Robert Clayton Understanding the seismic wave propagation in complex media—with small-scale heterogeneities, rough topography and interfaces, anisotropy, or pore fluids—is crucial to various aspects of geophysics including earthquake ground motion prediction and... more
Poster 222	GM	Empirical Map-Based Models of Nonergodic Site Response in the Greater Los Angeles Area Grace Parker, Annemarie Baltay We develop empirical estimates of nonergodic site response factors at seismic stations in the greater Los Angeles area using a combined dataset of recorded ground motions from 473 M 3-7.3 earthquakes in Southern California. The data are a... more
Poster 105	Geodesy	Rheological implications of post-seismic deformation following the 2019 Ridgecrest Earthquakes Camilla Penney, Jean-Philippe Avouac Post-seismic deformation following large earthquakes offers insights into the rheology of the lithosphere and upper asthenosphere. Unprecedented geodetic coverage of the 2019 Ridgecrest earthquakes provides an opportunity to test whether... more	20141
Poster 185	CXM	A Virtual Reality Experience of the California Faults Dianne Pham, Michael Methvin, Christodoulos Kyriakopoulos In recent years, the use of Virtual Reality (VR) has opened new possibilities for the visualization and analysis of scientific data. Earth sciences and specifically the field of Earthquake Science would highly benefit from the use of VR. More... more
Poster 020	Geology	Evidence of previous faulting along the 2019 Ridgecrest earthquake ruptures Belle Philibosian, Jessica Thompson Jobe, Colin Chupik, Timothy Dawson, Scott Bennett, Ryan Gold, Christopher DuRoss, Tyler Ladinsky, Katherine Kendrick, Elizabeth Haddon, Ian Pierce, Brian Swanson, Gordon Seitz The July 2019 Ridgecrest earthquake sequence in southeastern California has been characterized as surprising because no continuous faults longer than 7 km were recognized in the area prior to these events. Only ~35% of the 2019 rupture occurred on... more
Poster 012	Geology	The source of shallow slow earthquakes: Insights from field observations and experiments on an exhumed subduction mélange Noah Phillips, Christie Rowe, Kohtaro Ujiie, Melodie French, Ben Belzer, Ginta Motohashi Field constraints on the mechanics behind slow earthquake phenomena exist downdip of the seismogenic zone. However, interpretations based on observations from the shallow subduction interface, which may also host slow earthquake phenomena, are... more
Poster 008	Geology	Characteristics of Surface Rupturing Earthquakes in the Walker Lane from Centimeter Scale Orthoimagery Ian Pierce, Rich Koehler, Alana Williams, Seth Dee, Gordon Seitz Centimeter scale drone based structure from motion orthoimagery was collected shortly following the 2019 M6.4 & 7.1 Ridgecrest and 2020 M6.5 Monte Cristo earthquakes. Fractures are mapped at high detail for tens of km along each rupture. Despite... more	20103

The Southern California Earthquake Center is committed to providing a safe, productive, and welcoming environment for all participants. We take pride in fostering a diverse and inclusive SCEC community, and therefore expect all participants to abide by the SCEC Activities Code of Conduct.

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