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 101-150 of 305

SCEC ID	Category	Title and Authors	SCEC Award
Poster 170	FARM	Effect of Undrained Gouge Plasticity on Rupture Dynamics of Rough Faults Evan Hirakawa, Shuo Ma Recent rough fault models show that geometrical irregularities can have a significant effect on rupture propagation, leading to observations of rupture arrest, supershear rupture, fluctuations in rupture velocity, and high frequency ground motions.... more	17220
Poster 153	Geology	3D Constraints On Fault Architecture and Strain Distribution of the Newport-Inglewood Rose Canyon and San Onofre Trend Fault Systems James Holmes, Neal Driscoll, Graham Kent The Inner California Borderlands (ICB) is situated off the coast of southern California and northern Baja. The structural and geomorphic characteristics of the area record a middle Oligocene transition from subduction to microplate capture along the... more
Poster 040	Seismology	Rocking the Boat: Poro-elastic Stress Change at Seismogenic Depth Associated with Oil Production in the Los Angeles Basin in the Early 20th Century Susan Hough, Roger Bilham The Newport-Inglewood Fault and other faults in the southwestern Los Angeles Basin are characterized by low slip and seismicity rates; the rate of moderate (Mw4.0-6.4) earthquakes on these faults was, however a factor of ≈5 higher between 1920-1960... more
Poster 262	GM	Testing the Density of Seismic Networks with ShakeMap Zhifeng Hu, Kim Olsen ShakeMap, developed by the U.S. Geological Survey, is an important tool used to assess the extent of ground motions after an earthquake, which can be used for loss estimation, public information, and emergency management efforts. Thus, the more... more
Poster 064	Seismology	Large-scale Acceleration of Slow Slip Before the 2015 Mw 8.4 Illapel, Chile Earthquake Hui Huang, Lingsen Meng Foreshocks and/or slow slip were observed to accelerate before some recent large earthquakes, e.g., the 2011 M 9.0 Tohoku-Oki and the 2014 M 8.2 Iquique earthquake. However, it is still controversial regarding the universality of precursory signals... more
Poster 168	FARM	The effects of segmented fault zones on earthquake rupture propagation and termination Yihe Huang A fundamental question in earthquake source physics is what control the nucleation and termination of an earthquake rupture. Besides stress heterogeneities and variations in frictional properties, damaged fault zones (DFZs) that surround major... more	17071
Talk Wed 10:30	EEII	The HayWired Scenario — How can the San Francisco bay region bounce back better? Kenneth Hudnut, Anne Wein, Dale Cox, Suzanne Perry, Keith Porter, Laurie Johnson, Jennifer Strauss The HayWired scenario is a hypothetical yet scientifically realistic and quantitative depiction of a moment magnitude (Mw) 7.0 earthquake (mainshock) occurring on April 18, 2018, at 4:18 p.m. on the Hayward Fault in the east bay part of the San... more
Poster 067	Seismology	Ambient tectonic tremor in the San Jacinto Fault Alexandra Hutchison, Abhijit Ghosh Multiple, discrete instances of ambient tectonic tremor were detected in the Anza Seismic Gap section of the San Jacinto Fault (SJF) during June 2011 using both high-density arrays and a variety of network stations. These events were detected,... more	15164
Poster 074	Seismology	Earthquake Monitoring with the MyShake Global Smartphone Seismic Network Asaf Inbal, Qingkai Kong, Richard Allen, William Savran Smartphone arrays have the potential for significantly improving seismic monitoring in sparsely instrumented urban areas. This approach benefits from the dense spatial coverage of users, as well as from communication and computational capabilities... more
Poster 154	SAFS	Paleoseismic Investigation of Van Matre Ranch Site Along the Carrizo Plain Section of the San Andreas Fault Nick Inserra, Clayton Nelems, Radwan Muthala, Jeremy Torres, Sinan Akciz Correlation of paleoseismic data from both Bidart Fan and Frazier Mountain sites indicate recurrence intervals of ~100 yrs between large surface rupturing earthquakes in the Carrizo Plain and Big Bend sections of the San Andreas Fault during the... more
Poster 015	EFP	Prospective test of the 1995 WGCEP SoCal earthquake forecast David Jackson In 1995 the Working Group on California Earthquake Probabilities published a 30-year forecast of magnitude 6 and larger earthquakes in southern California. SCEC organized and sponsored the report, and it was SCEC’s first major earthquake forecast in... more	17134
Poster 131	Geology	Ladders, stair-steps, and crossing faults: Insights from southern California’s active strike-slip faults Susanne Jänecke, Benjamin Belgarde, Ann Bykerk-Kauffman, James Evans, Stefan Kirby, Daniel Markowski, Alexander Steely, Steve Thornock Detailed mapping and structural analyses of the San Andreas, San Jacinto, Elsinore, and cross faults, southern California, reveals geometries of strike-slip (ss) faults that do not match classic models. Many fault zones exhibit ladder-like... more	07126, 11164, 12137, 10134
Poster 243	GM	Simulation and Validation of Topographic Effects on Mt Pleasant, Christchurch, New Zealand Seokho Jeong, Kami Mohammadi, Domniki Asimaki, Brendon Bradley Damage distribution maps from strong earthquakes and recorded data from field experiments have repeatedly shown that the ground surface topography and subsurface stratigraphy play a decisive role in shaping the ground motion characteristics at a... more
Poster 205	FARM	Earthquake variability, geodetic coupling, and microseismicity on heterogeneous faults: A case study of the Anza seismic gap Junle Jiang, Yuri Fialko The San Jacinto fault zone is the most seismically active fault in Southern California. Robust microseismicity occurs along much of the San Jacinto fault, but is largely absent in the “Anza seismicity gap,” which lies between the Hot Springs and... more	17032
Poster 206	SDOT	Stress models of the annual hydrospheric, atmospheric, thermal, and tidal loading cycles on California faults: Perturbation of background stress and changes in seismicity Christopher Johnson, Yuning Fu, Roland Bürgmann Deformation of the lithosphere arises from multiple natural loading sources that include both surface and body forces. The largest surface loads include near-surface water storage, atmosphere pressure, ocean loading, and temperature changes. The... more	16006
Talk Sun 18:00	CEO	Science in Society: Bridging the Gap Lucile Jones Society needs science-based decision making now more than ever, as the vulnerability of society is being magnified through population growth in hazardous regions and by the fragility of increasingly complex cities. Although the understanding of... more
Poster 025	SP	Automated Waveform Assembling for Full-3D Tomography Alan Juarez, Thomas Jordan Seismological research has broadly focused on developing techniques for extracting information from seismograms and constructing models of seismic source excitation and Earth structure. Examples of modeling methods include the measurement and... more	EAR-1033462, G108C20038
Poster 254	GM	PRISM, Processing and Review Interface for Strong Motion Data Software Erol Kalkan, Jeanne Jones, Christopher Stephens, Peter Ng A continually increasing number of high-quality digital strong-motion records from stations of the National Strong Motion Project (NSMP) of the U.S. Geological Survey (USGS), as well as data from regional seismic networks within the U.S., calls for... more
Poster 091	Geodesy	Production and Uses of Multi-Decade Geodetic Earth Science Data Records Sharon Kedar, Yehuda Bock, Angelyn Moore, Peng Fang, Anne sullivan, Donald Argus, Songnian Jiang, Scott Marshall The Solid Earth Science ESDR System (SESES) project funded under the NASA MEaSUREs program produces and disseminates mature, long-term, calibrated and validated, GNSS based Earth Science Data Records (ESDRs) that encompass multiple diverse areas of... more
Poster 138	Geology	Luminescence dating for paleoseismic research: What users need to know Amanda Keen-Zebert Luminescence dating is now widely used in paleoseismic applications, particularly where there is a lack of suitable organic material for radiocarbon dating. It has been applied to define the timing of slip rates, earthquake recurrence, and fault... more
Poster 117	Geology	Geomorphic and geologic evidence for slip along the San Bernardino strand of the San Andreas Fault System through the San Gorgonio Pass structural knot, southern California Katherine Kendrick, Jonathan Matti The San Gorgonio Pass (SGP) region of southern California represents an extraordinarily complex section of the San Andreas Fault (SAF) zone, often referred to as a structural knot. Complexity is expressed both structurally and geomorphically, and... more
Poster 200	FARM	Rupture of an Immature Fault in the Pawnee Mw5.8 earthquake Kathleen Keranen, Heather Savage, Genevieve Coffey, Rowena Lohman, Catherine Lambert, Nathan Stevens, Hannah Rabinowitz Earthquakes across north-central Oklahoma demonstrate considerable variability, with some areas remaining nearly aseismic despite abundant injection. Where earthquakes do occur, they largely rupture unmapped faults, even in regions where mapped... more
Poster 088	Geodesy	Creep avalanches on San Andreas Fault and their underlying mechanism from 19 years of InSAR and seismicity Mostafa Khoshmanesh, Manoochehr Shirzaei Recent seismic and geodetic observations indicate that interseismic creep rate varies in both time and space. The spatial extent of creep determines the earthquake potential, while its temporal evolution, known as slow slip events (SSE), may trigger... more
Poster 237	EEII	An application of machine learning techniques to the evaluation of goodness-of-fit scores used in earthquake ground motion validation Naeem Khoshnevis, Ricardo Taborda We present an alternative approach to defining a goodness-of-fit (GOF) scoring system that uses machine learning techniques to evaluate the metrics commonly employed to validate synthetic seismograms from earthquake ground motion simulations with... more	16-067
Poster 094	Geodesy	On the Geodetic Signature from Lake Mead Water Levels Fluctuations (1940-2016) Debi Kilb, Adrian Borsa, Duncan Agnew Large load changes due to fluctuations in surface water repositories (i.e., reservoirs and lakes) can result in a solid earth response that is observable in GPS surface displacements. The spatial distribution of the resulting earth response to these... more
Poster 266	GM	Developing ground motion prediction equations for western Saudi Arabia using an adjustment of a reference model Ryota Kiuchi, Walter Mooney, James Mori, Hani Zahran, Wael AlRaddadi, Salah Youssef There are several active seismic zones around Saudi Arabia, including the Red Sea and the Gulf of Aqaba where a destructive magnitude 7.3 event occurred in 1995 (Mohamad et al., 2000). The recently deployed dense seismic network organized by the... more
Poster 212	SDOT	Seasonal Variation of Strain in Central California and its Correlation with Seismicity Meredith Kraner, William Hammond, Corné Kreemer, Ilya Zaliapin Our recently completed analysis of seasonal strain in Central California using horizontal GPS data shows positive extensional dilatational strain peaking in the dry season (August/September) and negative contractional strain peaking in the wet... more
Poster 165	FARM	3D Simulations of Earthquakes on Parallel Offset Faults with Homogeneous Stress Conditions Kayla Kroll, Keith Richards-Dinger, James Dieterich, David Oglesby Several recent large earthquakes including the 2002 Mw7.9 Denali, Alaska, 2010 Mw7.2 El Mayor-Cucapah, Mexico, and the 2016 Mw7.8 Kaikoura, New Zealand events ruptured up to a dozen fault segments. Understanding how ruptures are able to jump across... more
Poster 193	FARM	Experimental Investigation on Poro-Elasto-Visco-Plastic Behavior of the Inner Accretionary Wedge Sediments at the Nankai Subduction Zone Szu-Ting Kuo, Manami Kitamura, Hiroko Kitajima The Integrated Ocean Drilling Program (IODP) Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) has installed borehole observatories to monitor the evolution of physical and hydrological properties caused by crustal deformation at various... more
Poster 177	FARM	Can the Southern San Andreas Fault be Triggered by Cross-Fault Earthquakes? Christodoulos Kyriakopoulos, David Oglesby, Aron Meltzner, Thomas Rockwell, Michael Barall The Brawley Seismic Zone (BSZ) is the step-over region between what is believed to be the southern terminus of the southern San Andreas Fault (SSAF), near Bombay Beach, and the northern end of the Imperial Fault. Within the past 30 years, numerous... more	16231
Poster 235	CXM	Impact of Earthquake Depth on Basin Response Voon Hui Lai, Robert Graves, Donald Helmberger Seismic observations from two similar magnitude events (Mw 4.4) with strike-slip mechanisms near Fontana but at different depths (3.5 km and 14.2 km) yield very different response at high and low frequency across the Los Angeles Basin. The deeper... more
Poster 175	FARM	Implications of depth-dependent variations in fault zone properties for the frequency content of seismic radiation Valere Lambert, Nadia Lapusta Seismic observations from several recent great earthquakes - the 2004 Mw 9.2 Sumatra-Andaman, 2010 Mw 8.8 Chile, and 2011 Mw 9.0 Tohoku-Oki events – suggest that more of the high-frequency radiation from the rupture process originated from the... more	17154
Talk Tue 14:00	CSEP	The 2016 Mw 7.8 Kaikoura Earthquake: Perspectives from Earthquake Geology into Seismic Hazard Robert Langridge, Pilar Villamor, Nicola Litchfield, Russ Van Dissen, Kate Clark, William Ries, Jesse Kearse, Timothy Little, Matthew Gerstenberger, Tatiana Goded, the Kaikoura Earthquake Response Team The 14 November 2016 (local time) Mw 7.8 Kaikōura earthquake, New Zealand is an exceptional example of multi-fault rupture and efforts to document the extent and character of fault rupture will provide a valuable case study of end-member fault... more
Poster 188	FARM	The Role of Dilatancy in Fluid-Induced Fault Slip Stacy Larochelle, Nadia Lapusta, Jean-Paul Ampuero Numerous industrial activities (e.g., hydraulic fracking, wastewater disposal and enhanced geothermal systems) involve fluid injections into the crust. That these anthropogenic fluid injections have the potential to induce fault slip has been known... more	17154
Poster 265	GM	Investigation of Systematic Ground Motion Effects Through Ground Motion Simulation of Small-to-Moderate Magnitude Earthquakes in the Canterbury, New Zealand Region Robin Lee, Brendon Bradley, Robert Graves, Adrian Rodriguez-Marek, Peter Stafford This poster presents results of ground motion simulations of small-to-moderate magnitude (3.5<Mw<5.0) earthquake events in the Canterbury region over the past decade, for which centroid moment tensor solutions are available, and an... more
Poster 279	CS	Tuning AWP-ODC-OS for efficient, scalable performance on manycore architectures David Lenz, Josh Tobin, Alexander Breuer, Alexander Heinecke, Charles Yount, Yifeng Cui AWP-ODC-OS is open-source software which simulates seismic wave propagation after a fault rupture by using a staggered-grid finite difference method. Widely in use within the SCEC community, AWP-ODC-OS is now highly tuned for two important... more
Poster 123	Geology	Structural Architecture of the Western Transverse Ranges and Potential for Large Earthquakes – Trishear Forward Models Yuval Levy, Thomas Rockwell, John Shaw, Andreas Plesch, Neal Driscoll, Hector Perea Fold-and-thrust belts evolve over time, can produce large-scale faults and potentially accommodate large magnitude earthquakes. The thrust fronts of these structures typically form large fold structures in their hanging walls, and they tend to... more	16049
Poster 066	Seismology	Continuous Tremor in the Alaska-Aleutian Subduction Zone Detected by Aleutian Array of Arrays Bo Li, Abhijit Ghosh, Clifford Thurber, Federica Lanza Previous studies show tremor activities represent slips on small asperities due to slow slip in the surrounding region [e.g., Bartlow et al, 2011; Ghosh et al., 2012]. Therefore, their spatiotemporal distribution, migration directions, patterns and... more
Poster 136	Geology	Distribution of Earthquake-Triggered Landslides across Landscapes: Towards Understanding Erosional Agency and Cascading Hazards Gen Li, Josh West In mountainous regions, earthquake-triggered landslides are a critical geohazard, a major agent of erosion, and a powerful driver of the carbon cycle. How landslides distribute across landscapes provides key information for hazard management and for... more
Poster 310	CEO	2017 USEIT: Hazard and Risk Visualization of Earthquake Scenarios Yipeng Li, Sophia Belvoir, Abigail Edwards, Amelia Midgley, Rafael Uribe, Resherle Verna, Jozi Pearson, Thomas Jordan, Gabriela Noriega, Kevin Milner, Hope Seligson As part of the 2017 Undergraduate Studies in Earthquake Information Technology (USEIT) research challenge, the Hazard and Risk Visualization (HaRVi) Team applied a multidisciplinary approach to address a complex earthquake hazard problem. The HaRVi... more
Poster 062	Seismology	Dynamic triggering of earthquakes north of Xiaojiang Fault, Yunnan Yuexin Li, Roland Bürgmann, Hongfeng Yang, Shiyong Zhou Dynamic triggering is a ubiquitous phenomenon that has been well-documented all around the world. Most dynamic triggering cases are observed through visually inspecting their spectrograms and seismic records, and the triggered earthquakes are... more
Poster 027	Seismology	Stress- and structure-induced anisotropy in Southern California from two-decades of shear-wave splitting measurements Zefeng Li, Zhigang Peng We measure shear-wave splitting (SWS) parameters (i.e. fast direction and delay time) using 330,000 local earthquakes recorded by more than 400 stations of the Southern California Seismic Network (1995-2014). The resulting 232,000 SWS measurements... more	15081
Poster 119	Geology	A new, 170 ka slip rate estimate on the Sierra Madre Fault Nathaniel Lifton The Sierra Madre fault (SMF) system uplifts the San Gabriel Mountains along the northern Los Angeles metropolitan area. Slip rates on the Central SMF vary from ~3 mm/yr in geodetic studies to ~1 mm/yr in late Quaternary geologic studies. There have... more	16066
Poster 041	Seismology	Shallow crustal imaging in Southern California using ambient noise and fault zone trapped waves Fan-Chi Lin, Elizabeth Berg, Amir Allam, Hongrui Qiu, Yadong Wang, Yehuda Ben-Zion Better determination of shallow crustal structure is critical for earthquake hazard assessment. Here we present two efforts using detailed wavefield variation to investigate high-resolution crustal structure. In the first application, we extract... more	17195, 17229
Poster 273	GM	Linking Subsurface and Surface Processes: Insights on Vs30 Distribution in Southern California Jessica Lin, Seulgi Moon, Alan Yong, Lingsen Meng, Antony Martin, Paul Davis Earth’s surface and subsurface processes such as bedrock weathering, soil production, and river incision can influence and be influenced by spatial variations in the mechanical strength of surface material. Mechanically weakened rocks tend to have... more	17030, 16076
Poster 241	EEII	Characterization of basin effects for seismic performance assessments of tall buildings using CyberShake simulations Ting Lin, Nenad Bijelic, Gregory Deierlein To explore where simulated ground motions provide unique advantages over recorded motions for performance-based engineering, this work focuses on basin effect characterization in seismic hazard and risk assessments of tall buildings. Basin effects... more	16139
Poster 181	FARM	Comparison of actual and seismologically inferred stress drops in asperity-type dynamic source models of microseismicity Yen-Yu Lin, Nadia Lapusta Estimating source parameters for small earthquakes is commonly based on either Brune or Madariaga source models. These models assume circular rupture that starts from the center of a fault and spreads axisymmetrically with a constant rupture speed.... more	17154
Poster 038	Seismology	Attenuation Tomography at High Frequencies in Southern California Yu-Pin Lin, Thomas Jordan Accurate 3-D models of crustal attenuation structure are important for simulating seismic wavefields at high frequencies (f > 1 Hz). Southern California is an excellent natural laboratory for studying crustal attenuation, owing to its high... more
Poster 115	Geology	San Andreas Fault Characterization at the LADWP Elizabeth Tunnel Scott Lindvall, Scott Kerwin, James Evans, Jeffrey Tyson, James Chestnut, Chris Heron, Kevin Mass, Katherine Scharer, Devin McPhillips, Diane Moore, Michael Farr, Christopher Ballard, Randolph Williams, Kelly Bradbury, Christie Rowe, Heather Savage Newly acquired subsurface data across the San Andreas Fault (SAF) provides insight into the geometry, structure, and composition of the upper part of the SAF zone in the northern Sierra Pelona Mountains, CA. The purpose of the investigation was to... more
Poster 195	FARM	A Simple Spring-Mass-Dashpot Model for Slow Earthquakes on a Viscous Fault Rachel Lippoldt, Charles Sammis One and two dimensional spring-mass-dashpot models are used to simulate the propagation of slow events in a viscous fault zone that is pinned by an array of asperities. The asperities fail at stress thresholds that lie within a prescribed range. The... more

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