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 323

SCEC ID	Category	Title and Authors	SCEC Award
Poster 238	Geology	Investigating strain transfer along faults in Joshua Tree National Park, CA, with possible implications for along strike variations in southern San Andreas Fault slip rate Katherine Guns, Richard Bennett, Kimberly Blisniuk, Sally McGill The pattern of and relationship between elastic and permanent strain accumulation adjacent to the southern San Andreas Fault (SSAF) zone in the Eastern Transverse Ranges Province (ETR) are currently only poorly understood, hampering assessments of... more	17161
Poster 061	Seismology	Machine Learning in detecting Low-frequency Earthquakes in Shikoku, Japan Huiyun Guo, Hui Huang, Tian Feng, Lingsen Meng Low-frequency earthquakes (LFEs) occur largely during slow slip events at subduction interfaces. Their actions affect the stress state of the seismogenic zone and potentially link to larger ordinary earthquakes. Detecting and analyzing low-frequency... more
Poster 237	Geology	Distributed fault slip in the Eastern California shear zone: adding a piece to the puzzle Elizabeth Haddon, David Miller, Victoria Langenheim, Tanzhuo Liu, Elmira Wan, Laura Walkup The Lockhart (LF) and Mt. General (MGF) faults are two primary structures accommodating dextral shear across the northern portion of the Eastern California shear zone. Early mapping infers simple fault traces branching NW of the Lenwood fault and... more
Poster 318	CEO	Communicating Seismological Uncertainty to the Public: A Case Study in Oklahoma Georgia Halkia, Lisa Grant Ludwig Over the past decade, seismicity in Oklahoma has increased dramatically. Communication research shows that people receive information from various channels and, based on their values and perceived risks, will decide if preparing for a disaster is... more
Poster 285	Seismology	The rupture process of 2018 Mw 7.0 Kalapana, Hawaii earthquake and relation with the 1975 event Jinlai Hao, Wenze Deng, Chen Ji The Mw 7.0 2018 Kalapana, Hawaii earthquake struck the south flank of Kilauea volcano, Hawaii Island, on May 4th 2018, a day after the starting of the 2018 Lower Puna eruption. Its epicenter was a few km away from the epicenter of 1975 Mw 7.7... more
Poster 047	EFP	Updated California Aftershock Parameters Jeanne Hardebeck, Andrea Llenos, Andrew Michael, Morgan Page, Nicholas van der Elst Reasenberg and Jones (Science, 1989) introduced a statistical model for aftershock rate following a mainshock, along with estimates of "generic" California parameter values based on past aftershock sequences. The Reasenberg and Jones (... more
Talk Mon 13:30	FARM	Moving Earthquake Science Forward - Earthquake Simulation Codes and the SCEC-USGS Dynamic Rupture Group Ruth Harris Computational simulations of earthquake rupture provide clues for deciphering earthquake behavior. In a perfect world, we would have a complete set of observations at Earth’s surface and at depth that would allow us to forgo simulations, but in... more	17075
Poster 120	Geodesy	Stress accumulation rate on source faults around the junction of Ryukyu and Southwest Japan arcs using finite element model Akinori Hashima, Hiroshi Sato, Tatsuya Ishiyama, Andrew Freed, Thorsten Becker The Kyushu island of Japan is located at the hinge of the Ryukyu and the Southwest Japan arcs, which are formed by the subduction of the Philippine Sea plate along the Ryukyu trench and the Nankai trough, respectively. The tectonics of the island... more
Poster 165	SDOT	Assessing kinematic compatibility of fault geometry and slip rates along the southern San Andreas fault system in the San Gorgonio Pass region Jennifer Hatch, Michele Cooke Assessment of seismic hazards in southern California may be improved with more accurate characterization of geometry and slip rates along the active San Andreas fault strands within the San Gorgonio Pass region. On-going debate centers on the... more	18200
Poster 076	Seismology	Characteristics of Three Small (Mw < 4.5) Urban Area Sequences in the Walker Lane: Earthquake Interaction, Fault Structure, and Source Properties Rachel Hatch, Rachel Abercrombie, Christine Ruhl, Ken Smith We analyze three well-recorded small earthquake sequences (2015 Thomas Creek; 2017 Truckee; 2014 Virginia City) within urban areas in the Walker Lane region. Using absolute and relative relocation along with source parameter analysis, we detect... more
Poster 221	Geology	Paleoearthquake record of the Conway segment of the Hope fault: Implications for patterns of earthquake occurrence in northern South Island and southern North Island, New Zealand Alexandra Hatem, James Dolan, Robert Langridge, Robert Zinke, Russ Van Dissen, Christopher McGuire, Ed Rhodes Paleoseismic trenches excavated at two sites reveal the ages of late Holocene earthquakes along the Conway segment of the Hope fault, the fastest-slipping fault within the Marlborough fault system in northern South Island, New Zealand. At the Green... more
Poster 069	Seismology	Sudden Surges of Seismicity within Natural Slow Growing and Long Duration Seismicity Swarms near Cahuilla Valley in the Central Peninsular Ranges, Southern California Egill Hauksson, Zachary Ross, Elizabeth Cochran The most recent Cahuilla swarm that started back in mid 2016 has grown steadily in number of events (~10,000 of M>0.3) and presently extends over an almost north-south linear trend of ~7 km. Since late on 11 August 2018 the seismicity... more	17044
Poster 152	CXM	Progress toward a Community Rheology Model of Southern California Elizabeth Hearn, Michael Oskin, Wayne Thatcher, Greg Hirth, Whitney Behr, Mark Legg The principal goal of the SCEC Community Rheology Model (CRM) TAG for SCEC5 is to develop a three-dimensional description of the rheology of southern California’s lithosphere. Though the CRM is intended as a resource for developing realistic and... more	18184, 18193, 18156, 18041, 18195, 18202
Poster 187	FARM	Nucleation and propagation of slow slip pulses on rate-strengthening faults Elias Heimisson, Eric Dunham, Martin Almquist Slow slip instabilities and transient aseismic slip have been observed in many settings, including the San Andreas system and subduction zones. Most theories for slow slip events postulate that instabilities initiate under rate-weakening friction,... more	18047
Poster 259	SAFS	Multicomponent Model of Crustal Stress at Cajon Pass with Implications for Stress Field Heterogeneity Elliott Helgans, Karen Luttrell, Bridget Smith-Konter Cajon Pass (CP) marks the primary junction between the San Andreas and San Jacinto fault networks. Highly segmented faulting in the region encourages investigation into whether the junction acts as a behavioral boundary on multi-fault ruptures.... more	18150
Poster 314	CEO	The Development of 3-D Software to Assist the Visualization of Large and Concurrent Earthquake Data Brandon Ho, Shalani Weerasooriya, Alejandro Narvaez-Colon, Tiffany Streitenberger, Dian Zhu, Trent Jones, Bill Addo, John Yu, Kevin Milner, Gabriela Noriega, Jozi Pearson, Thomas Jordan SCEC-VDO or the Southern California Earthquake Center Visual Display of Objects, is a software that assists in visualizing seismic and geological information for publication, education, and animation. A software created, developed, and annually... more
Poster 203	FARM	Investigating and validating surface rupture characteristics with rupture dynamics on faults with shallow complexities Sebastien Hok, Rihab Sassi, Yann Klinger Earthquake surface rupture style can take many forms, ranging from a sharp cut in the landscape to a wide distribution of cracks. This complexity is related to several physical parameters (either average or local parameters of the rupture) that we... more
Poster 097	Seismology	A Proposal for an Industry-Scale Seismic Survey in the Los Angeles Basin Daniel Hollis, Robert Clayton We are proposing a large-scale seismic survey for the Los Angeles sedimentary basin for the purpose of determining the structure of the basin and the underlying crust. We believe the survey will be valuable for creating densely sampled micro-... more
Poster 162	SDOT	Lithosphere Viscosity Variations in Southern California William Holt, Laurent Montesi, Alireza Bahadori We combine stress estimates from geodynamic models and predictions of lithosphere rheology based on various SCEC community models to generate an integrated view of the strength of the lithosphere at regional scale. We use RHEOL to calculate the... more	18187
Poster 030	CISM	Development of monitoring and forecasting methods for crustal activity utilizing large-scale high-fidelity finite element simulations with 3D heterogeneous medium Takane Hori, Tsuyoshi Ichimura, Kohei Fujita, Takuma Yamaguchi, Takeshi Iinuma, Ryoichiro Agata To analyse crustal activity in the Earth's interior, such as spatio-temporal variation in slip velocity on the plate/fault interfaces including ordinary and slow earthquakes, we need to use the data observed mostly on the Earth's surface.... more
Poster 302	GM	The 1933 Long Beach, California, Earthquake Susan Hough, Robert Graves We present a first-ever synoptic characterization of the distribution of ground motions from the 11 March 1933 Mw6.5 Long Beach, California, earthquake, using available macroseismic and instrumental data. The detailed shaking intensity pattern... more
Poster 018	GM	Kinematic Source Models for Earthquake Simulations with Fault-zone Plasticity Zhifeng Hu, Daniel Roten, Kim Olsen, Steven Day Fault slip and surface deformation patterns are essential factors in seismic hazard assessment. However, slip inversions reveal a widely observed shallow slip deficit (SSD) which has not yet been clearly explained. One possible cause of the SSD is... more	18190
Poster 071	Seismology	Comprehensive Study on Reservoir-induced Seismicity in the Xiaowan Reservoir, Yunnan Province, China Wei Hua, Naichen Ke, YAQIONG DAI The Xiaowan reservoir is located in the middle section of the Lancang River in the west of Yunnan province, China, and the Xiaowan Reservoir Digital Seismic Station Network (XRDSSN) had been in operation since 21 May 2005. Its filling operations... more
Poster 060	Seismology	Matched-filter Detection of Microseismicity Around the Eruption of the 2018 Kilauea Volcano, Hawaii Hui Huang, Lingsen Meng The eruption of the Kilauea volcano started on April 30th, 2018, followed by widespread lava flows along the Southwest and East rift zones. Micro-seismicity analysis is important for identifying underground magma movement before the eruption. Here,... more
Poster 253	Geology	Geomorphic evidence for the geometry and slip rate of the Southern San Cayetano fault: Implications for hazard assessment and fault interaction in complex tectonic environments Alex Hughes, Dylan Rood, Alexander Whittaker, Rebecca Bell, Thomas Rockwell, Yuval Levy, Klaus Wilcken, Lee Corbett, Paul Bierman, Duane DeVecchio, Scott Marshall, Larry Gurrola, Craig Nicholson We present surface evidence and displacement rates for an active, low-angle (~20°) thrust fault in close proximity to major population centers in southern California (U.S.A.), the Southern San Cayetano fault (SSCF). Active faulting along the... more	17184, 16049, 17024
Poster 196	FARM	Persistent effects of low-velocity fault zones on earthquake rupture after multiple earthquake cycles Benjamin Idini, Jean-Paul Ampuero Faults are usually embedded in a damaged zone characterized in field observations by distributed fractures and micro-cracks and in seismological and geodetic observations by reduced wave velocities relative to the wall rock. Recent dynamic rupture... more	18096
Poster 256	Geology	Quaternary slip history of the Santa Susana fault, western Transverse Ranges: Insights from U-Pb detrital zircon geochronology Jonathan Ingram, Reed Burgette, Brian Hampton The Santa Susana fault (SSF) is the western extension of the Sierra Madre reverse fault system, an east-west trending reverse fault system in the western Transverse Ranges. The SSF has the highest possible slip rate of any Sierra Madre fault segment... more
Poster 266	SAFS	Late Holocene Rupture History of the South-Central San Andreas Fault at the Van Matre Ranch site, Carrizo Plain, California Nick Inserra, Sinan Akciz Characterizing long-term rupture patterns for the South-Central San Andreas Fault (SAF) is integral in evaluating seismic hazard in southern California. Recent paleoseismic data from both Bidart Fan and Frazier Mountain sites indicate recurrence... more
Poster 098	Seismology	Shallow Velocity Structure of Los Angeles Basin from ambient noise correlations with dense seismic arrays Zhe Jia, Robert Clayton, Jorge Castillo Castellanos It is important to understand the lateral variations in sediment structure of the Los Angeles (LA) Basin, since its shallow velocity structure can amplify strong ground motions. Existing sediment models of the LA Basin are generally derived from... more
Poster 188	FARM	Probing mechanisms of unsteady shallow creep on major crustal faults Junle Jiang, Yuri Fialko A number of major crustal faults exhibit geodetically detectable shallow creep that involves both spontaneous and triggered slip events along tens of kilometers-long fault sections. Notable examples include the Ismetpasa segment of the North... more	18093
Talk Mon 14:00	FARM	Advancing Simulations of Sequences of Earthquakes and Aseismic Slip [SEAS] Junle Jiang, Brittany Erickson Robust predictive models of earthquake source processes have fundamental importance in earthquake science. Numerical simulations of dynamic earthquake ruptures have excelled in reproducing detailed processes during individual events. To bridge the... more	18099
Poster 087	Seismology	Exploration of Prompt Elastogravity Signal for the 2004 M9.0 Sumatra and 2010 M8.8 Maule Earthquakes Xinyu Jiang, Lingsen Meng A rapid detection is of great importance to earthquake and tsunamis early warning. Generated by the change of gravitational field, instantaneous signals which travels at the speed of light and are much faster than elastic waves such as P wave, have... more
Poster 305	GM	Characteristics of ground motion generated by interaction of wind gusts with trees, structures and other obstacles above the surface Christopher Johnson, Haoran Meng, Frank Vernon, Nori Nakata, Yehuda Ben-Zion Detection of small seismic events requires the ability to separate them from other sources of weak ground motion. Toward this goal we deployed 42 Fairfield ZLand geophones from 9 February to 17 March 2018 at the SGB site on the San Jacinto fault... more	18059
Poster 281	FARM	Stress-glut representation by orthogonal moment-tensor fields Thomas Jordan, Alan Juarez Seismic radiation from indigenous sources of arbitrary complexity can be represented by a second-order tensor field that Backus named the stress glut. We prove a new representation theorem that exactly and uniquely decomposes any stress-glut density... more	18121
Poster 147	CXM	Optimization of Data Functionals for Full-3D Tomography Alan Juarez, Thomas Jordan Full three-dimensional tomography (F3DT) is an imaging technique for refining estimates of Earth structure by iteratively assimilating waveform data into 3D models of seismic wave propagation. We present a technique for systematically separating... more	18121
Poster 312	CEO	Simulating Millions of Years of Earthquakes in California using HPC Varduhi Kababjyan, Shril Panchigar, Anthony Lopez, Tomoe Mizutani, Anthony Guerra, Scott Callaghan, Jacquelyn Gilchrist, Jozi Pearson, Gabriela Noriega, Thomas Jordan As part of the 2018 Undergraduate Studies in Earthquake Information Technology (USEIT) internship program, interns worked on a Grand Challenge to evaluate how well the Third Uniform California Earthquake Rupture Forecast (UCERF3) can predict long-... more
Poster 154	SDOT	Borehole Breakout Determined Stress Regime in the Southern Los Angeles Basin, California Justin Kain, Patricia Persaud, Edward Pritchard The Los Angeles basin began its principal phase of opening with subsidence between the Palos Verde and Whittier fault zones and the Santa Monica fault systems. The basin then underwent early Pliocene NW-directed extension followed by transpression... more	16062, 15012
Poster 178	FARM	Mechanics of Fault-Tip Deformation in Brittle and Ductile Faults: Laboratory Test of Off-Fault Yield Models & Fracture Energy Budget Taka Kanaya, Greg Hirth Off-fault damage was characterized for propagating fault tips in experimentally deformed granular rocks, in conjunction with fracture mechanics analyses of fault-tip stress fields. (1) Tip regions of dynamic brittle faults formed at 20°C show... more	12153, 13123, 15117
Poster 240	Geology	Paleoseismology and Neotectonics of the Southern Sierra El Mayor, Baja California, Mexico Keene Karlsson, Thomas Rockwell, John Fletcher, Allen Gontz, Paula Figueiredo, Lewis Owen We present the results of detailed mapping and paleoseismic investigation along the southwestern flank of the Sierra El Mayor, a NW-SE trending mountain range in Baja California, Mexico, situated in a transtensive oblique rift boundary between the... more	16190
Poster 218	Geology	Paleoseismology of the northern San Jacinto fault, San Bernardino County Katherine Kendrick, Thomas Fumal The Colton paleoseismic site is located 5 km south of San Bernardino, along the Claremont segment of the San Jacinto Fault, in southern California. The excavations, two parallel trenches oriented orthogonal to the fault strike, exposed a broad,... more
Poster 119	Geodesy	Periodic Slow Slip Events and Their Interactions with Megathrust Earthquakes on Northeast Japan Subduction Zone Mostafa Khoshmanesh, Jennifer Weston, Manoochehr Shirzaei, Naoki Uchida Slow-slip event (SSE), a temporarily accelerated aseismic slip lasting hours to months, changes the stress regime on the fault itself and surrounding areas. On northeast Japan subduction zone (NJSZ), SSEs on the shallow locked zone, which is... more
Poster 156	SDOT	Monitoring Seasonally-Driven Stress Changes on Faults within the Plate Boundary Zone in California using cGPS Observations Jeonghyeop Kim, Alireza Bahadori, William Holt Using horizontal continuous GPS data between 2007 and 2018, we have quantified time-dependent horizontal transient strains within the Plate Boundary Zone in California. We also determine associated Coulomb stress changes on existing fault structures... more	18228, 16291
Poster 091	Seismology	2017 Mw 5.4 Pohang earthquake, South Korea and poroelastic stress change associated with fluid injection YoungHee Kim, Hobin Lim, Kai Deng, Jin-Han Ree, Teh-Ru Song We compute the spatiotemporal change in Coulomb stress using a fault failure model under various conditions to better understand the nature of 2017 Mw 5.4 earthquake (2017-11-15, 05:29) that occurred near the geothermal power plant in Pohang, South... more
Poster 027	GM	Probabilistic Seismic Hazard Analysis for Harrat Madinah, Saudi Arabia Using Regional Ground Motion Prediction Equations Ryota Kiuchi, Walter Mooney, Hani Zahran We present Probabilistic Seismic Hazard Analysis (PSHA) associated with future volcanic activity in Harrat (volcanic lava field) Madinah, Saudi Arabia using region-specific GMPEs. Harrat Madinah, which located in northwestern part of the Arabian... more
Poster 124	Geodesy	Earthquake damage patterns resolve complex rupture processes. The 2016 M7.8 Kaikoura earthquake Yann Klinger, Kurama Okubo, Amaury Vallage, Johann Champenois, Arthur Delorme, Esteban Rougier, Zhei Lei, Earl Knight, Antonio Munjiza, Claudio Satriano, Stephane Baize, Robert Langridge, Harsha Bhat Fracture damage patterns around faults induced by dynamic earthquake rupture are an invaluable record to clarify the rupture process on complex fault networks. The 2016 Mw 7.8 Kaikōura earthquake in New Zealand has been reported as one of the most... more
Poster 246	Geology	Shallow fault mapping in the Sacramento-San Joaquin Delta Shannon Klotsko, Jillian Maloney, Janet Watt In fall 2017, a chirp and sidescan survey was conducted in the Sacramento-San Joaquin Delta (Delta) to map and characterize shallow fault locations and geometries. The most prominent fault observed in the data is the Kirby Hills Fault, located at... more
Poster 248	Geology	3D insights into active deformation, stratigraphic architecture, and submarine slope failure in the Santa Barbara Channel, southern California Jared Kluesner, Daniel Brothers, Alexis Wright, Samuel Johnson Multiple submarine landslides, including the Gaviota (0.01 – 0.02 km3) and Goleta landslide complexes (3 – 4 km3) have been documented along the slope of the seismically active Santa Barbara Basin, however the preconditioning factors leading to... more
Poster 291	CS	An Efficient Numerical Method for the Simulation of Earthquake Cycles in Complex Geometries Jeremy Kozdon, Brittany Erickson The aim of this project is to develop a more complete understanding of the earthquake cycle by accounting for remote tectonic loading, material heterogeneity, and complex fault geometries. To do this we plan to couple interseismic cycle models with... more
Poster 197	FARM	3D Ruptures Simulations Across Stepping Faults; Comparing the Slip Weakening and Rate-State Friction Kayla Kroll, James Dieterich, Keith Richards-Dinger, David Oglesby Large earthquakes commonly involve the rupture of two or more faults sections including cases where the ruptures jump across gaps between disconnected sections. Several large earthquakes including the 3 November 2002 Mw7.9 Denali, Alaska, the 4... more
Poster 025	GM	Probabilistic Seismic Hazard Analysis in California Using Non-Ergodic Ground-Motion Prediction Equations Nicolas Kuehn, Norman Abrahamson, Melanie Walling With an increasing number of strong-motion records over the last decade, it has become clear that there are significant differences in ground-motion scaling even within relatively small regions such as California. Since GMPEs are typically based on... more

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