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 51-100 of 323

SCEC ID	Category	Title and Authors	SCEC Award
Poster 300	EEII	Zoning Verification in Mexico City using strong motions of the M7.1 M7.1 Puebla-Morelos earthquake of September 19, 2017 Mehmet Celebi, Valerie Sahakian, Diego Melgar, Luis Quintanar Spectral ratios computed from accelerations recorded by strong-motion stations in Mexico City during the mainshock of the September 19, 2017, M7.1 Puebla-Morelos earthquake reveal predominate periods consistent with those mapped in the 2004 Mexican... more
Poster 028	GM	Constraining epistemic uncertainties on hazard models in the Marmara region using SHERIFS (Seismic Hazard and Earthquake Rates in Fault Systems) Thomas Chartier, Oona Scotti, Hélène Lyon-Caen Modelling the seismic potential of active faults and the associated epistemic uncertainty is a fundamental step of probabilistic seismic hazard assessment (PSHA). SHERIFS (Seismic Hazard and Earthquake Rate In Fault Systems) is an open-source code... more
Poster 230	Geology	Seismic and aseismic fault slip revealed by luminescence bleaching depth profiles of the bedrock normal fault scarp Jie Chen, Ming Luo, Jintang Qin, Jinhui Yin, Lewis Owen, Haoran Wang, Huili Yang, Jinfeng Liu, Boxuan Zhang Understanding the partitioning of seismic and aseismic fault slip is critical to seismotectonics as it ultimately determines the seismic potential of faults. Recent advances in tectonic geodesy and remote sensing make it possible to develop... more
Poster 286	Seismology	Magma movement from Nāpau down to Leilani Triggered the 4th May 2018 Mw 7.0 Hawaii earthquake Kejie Chen, Jonathan D. Smith, Jean-Philippe Avouac, Zhen Liu, Song Y. Tony On 4th May 2018, a Mw 7.0 earthquake struck the south flank of Kīlauea, Hawaii, where volcanic activities have aggravated since late April. To investigate the possible cause-and-effect relationship between the magma movement and this earthquake, we... more
Poster 081	Seismology	Applying improved spectral analysis to an induced earthquake sequence in Oklahoma and implications on earthquake triggering Xiaowei Chen, Rachel Abercrombie Earthquake stress drop is an important parameter in ground motion prediction and earthquake source physics. However, it is notoriously known for its uncertainty. We develop an improved spectral analysis based on stacking. This method solves for an... more
Poster 007	EEII	Spatial correlations in CyberShake physics-based ground motion simulations Yilin Chen, Jack Baker This poster reports the results from quantifying spatial correlations in the intensity of ground shaking using physics-based simulations from the CyberShake platform. Currently, spatial ground motion variations in future earthquakes are predicted... more
Poster 078	Seismology	Source parameter variability of intraslab earthquakes as determined from the empirical Green's function method Shanna Chu, Gregory Beroza, William Ellsworth The mechanism of intraslab earthquakes are still incompletely understood. In particular, the relative importance of dehydration embrittlement, thermal shear runaway, hybrid dehydration-induced stress transfer, or some combination, and how these... more
Poster 099	Seismology	Basin Amplification Seismic INvestigation: tracking the propagation of waves from the San Andreas Fault to Los Angeles Robert Clayton, Marine Denolle, Kim Olsen, Patricia Persaud, Jascha Polet Seismic amplification in sedimentary basins naturally arise from the contrast in elastic wave speeds between soft sediments and hard bedrock. Connectivity in sedimentary basins can thus act as seismic waveguides. The Basin Amplification Seismic... more	18029
Poster 270	SAFS	In search of earthquakes, a biomarker thermal maturity investigation into the seismic potential of the central San Andreas Fault Genevieve Coffey Understanding the seismogenic potential of a fault is important in the assessment of seismic hazard in a region. We know that faults can exhibit a range of seismic behaviors from slow aseismic creep to fast earthquake slip. While earthquakes are not... more
Poster 080	Seismology	Revisiting historical earthquakes in our backyard: 1925 Santa Barbara and 1952 Kern County Scott Condon We revisit the historic 1925 Santa Barbara and 1952 Kern County earthquakes using available seismic and geodetic data. As these two events occurred before the establishment of the World-Wide Standard Seismographic Network, our knowledge is very... more
Poster 160	SDOT	Seafloor scarps, stepover geometry, and kinematics of the Newport-Inglewood fault zone offshore Oceanside, California James Conrad, Daniel Brothers, Maureen Walton, Ray Sliter, Peter Dartnell High-resolution Chirp sub-bottom data were collected in 2018 off the southern California coast between San Mateo Point and Carlsbad to image the right-lateral Newport-Inglewood (NI) fault zone and related faults on the outer shelf and upper slope.... more
Poster 313	CEO	Predictive Skill: Using the Bayesian Inference to Study RSQSim and UCERF3 Jordan Cortez, Guillermo Beas, Shengyu Wang, Cynthia Tong, Sebastien Rossouw, Katia Ascencio The undergraduate studies in earthquake information technology (USEIT) probabilistic forecasting team at the Southern California Earthquake Center (SCEC) worked closely with the High Performance Computing (HPC) team to calibrate parameters within... more
Poster 017	GM	Kinematic rupture simulations of earthquakes on multi-segment faults Jorge Crempien, Ralph Archuleta The presence of bends or multiple faults in the earthquake rupture process significantly affects the spatial seismic-moment distribution per segment and the time evolution of the rupture front. Because of this, it is clear that multi-segment rupture... more	17247
Poster 294	CS	Unified and Continuous Software Development for AWP-ODC-OS Yifeng Cui, Alexander Breuer, Rajdeep Konwar, David Lenz State-of-the-art software development and engineering techniques are in high demand for increased code quality and usability. Important best practices include sound licensing, unified software development, version control for software and data, as... more	18107
Poster 214	FARM	Earthquake sub-event scaling: new perspective for rupture determinism Philippe Danré, Jiuxun Yin, Bradley Lipovsky, Marine Denolle Strong ground motions during earthquake come from either a complex source time function or a complex wave propagation. We take advantage of global databases of source time functions (SCARDEC, Vallee et al. 2011, over 2,500 events and USGS, Hayes... more
Poster 046	EFP	Why do strike-slip earthquakes produce fewer aftershocks? Kelian Dascher-Cousineau, Emily Brodsky, Thorne Lay The number of aftershocks generated by an earthquake is generally related to the size of the mainshock. However, aftershock sequences can have significant excursions from a simple magnitude-dependent productivity law. This variability is... more
Poster 222	Geology	Preliminary geologic slip rates along Andes fastest slipping crustal fault, the Liquiñe-Ofqui Fault Zone (LOFZ), Patagonia, Chile Gregory De Pascale, Melanie Froude, Ivanna Penna, Reginald Hermanns, Daniel Moncada, Sergio Sepulveda, Mario Persico, David Petley, Gabriel Vargas, William Murphy, Sebastian Pairoa Chile ́s building code is designed for subduction zone events, and not for higher intensity strong-ground motions generated when crustal faults slip. Fault slip rates are therefore important imputs for these models. In Chile, crustal fault... more
Poster 213	FARM	Earthquake behaviors in Source Time functions: energetic onset of earthquakes and biases from over-simplifying the source pulse Marine Denolle, Philippe Danré Global databases of earthquake source time functions (STFs) provide tremendous opportunities to explore the temporal evolution of the source. We use two such databases (SCARDEC Vallee 2011,2016 and USGS Hayes 2017), to extract information about... more	17100
Talk Tue 13:30	CS	Deep learning for aftershock location patterns and the earthquake cycle Phoebe DeVries, Thomas Thompson, Martin Wattenberg, Fernanda Viegas, Brendan Meade Over the past few years, deep learning has led to rapid advances in applied computer science, from machine vision to natural language processing. These methods are now accessible to scientists across all disciplines due to the availability of easy-... more	17090
Talk Sun 18:00	CISM	Earthquake and fault system dynamics – Putting the pieces together James Dieterich In nature earthquakes do not occur as independent events on faults that are isolated in time and space. Rather they occur as emergent phenomena from the system dynamics of geometrically complex fault networks. Earthquake simulations that integrate... more
Poster 245	Geology	Characterizing the 3D geometry of the Ventura-Pitas Point fault system and its implications for earthquake hazards in southern California Jessica Don, Andreas Plesch, Mattie Newman, John Shaw The Ventura-Pitas Point fault system, located in the western Transverse Ranges, is one of the largest earthquake sources in southern California with Holocene marine terraces suggesting that deformation occurs in discrete 7-9 meter uplift events (... more	18032
Poster 167	SDOT	Deformation in the Yuha Desert from the 2010 M7.2 El Mayor – Cucapah Earthquake Andrea Donnellan, Jay Parker, Michael Heflin, John Rundle, Lisa Grant Ludwig, Gregory Lyzenga UAVSAR and GPS measurements were collected north of the US Mexico border spanning the 2010 M7.2 El Mayor – Cucapah earthquake from 6 months before to 7 years following the event. The area includes the Yuha Desert, Ocotillo area, and Salton Trough.... more
Poster 059	Seismology	Tracking thousands of microearthquakes for a month in northern Oklahoma: What a large-N array can reveal about induced seismicity Sara Dougherty, Elizabeth Cochran, Rebecca Harrington, Zachary Ross The substantial increase in earthquake rate observed in Oklahoma during the last decade has largely been attributed to the disposal of wastewater from energy production activities. While existing sparse regional networks are able to capture the... more
Poster 208	FARM	Effects of Fault Geometry and Pre-Stress Loading for Scenarios of Earthquakes on the Eastern San Gorgonio Pass Region in CA using Dynamic Rupture Simulations Roby Douilly, David Oglesby, Michele Cooke, Jennifer Beyer Compilations of geologic data have illustrated that the right-lateral Coachella segment of the southern San Andreas Fault is past its average recurrence time period. On its western edge, this fault segment is split into two branches: the Mission... more
Poster 224	Geology	Using relative structural complexity of fault segment barriers to model prehistoric earthquake rupture histories Christopher DuRoss, Ryan Gold, Rich Briggs, Scott Bennett Geometrically complex structures along faults, such as fault steps and bends, commonly limit the lateral extent of surface-rupturing earthquakes. However, reconstructions of prehistoric fault ruptures often treat these structures as binary limits to... more
Poster 199	FARM	Modeling Earthquake Mechanics with High Resolution Fault Zone Physics: New Computational Tools for Addressing The Conundrum of Scales Ahmed Elbanna, Setare Hajarolasvadi, Xiao Ma, Mohamed Abdelmeguid, David Kammer, Gabriele Albertini, Bob Haber, Amit Madhukar Modeling earthquake ruptures is a complex challenge due to the wide range of spatio-temporal scales contributing to the dynamic instability, ensuing propagation, and slow inter-seismic deformation. New numerical schemes based on efficient domain... more
Poster 192	FARM	The Community Code Verification Exercise for Simulating Sequences of Earthquakes and Aseismic Slip (SEAS): Initial Benchmarks and Future Directions Brittany Erickson, Junle Jiang, Michael Barall, Nadia Lapusta, Eric Dunham, Ruth Harris, Lauren Abrahams, Kali Allison, Jean-Paul Ampuero, Sylvain Barbot, Camilla Cattania, Ahmed Elbanna, Yuri Fialko, Benjamin Idini Zabala, Jeremy Kozdon, Valere Lambert, Yajing Liu, Yingdi Luo, Xiao Ma, Paul Segall, Pengcheng Shi, Meng Wei Numerical simulations of Sequences of Earthquakes and Aseismic Slip (SEAS) have made great progress over the past decades to address important questions in earthquake physics and fault mechanics. Significant challenges in SEAS modeling remain in... more	18099, 17151
Poster 020	GM	Modeling shallow crustal nonlinearity in physics-based earthquake simulations: Beyond perfect plasticity Elnaz Esmaeilzadeh Seylabi, Doriam Restrepo, Domniki Asimaki, Ricardo Taborda We implement and verify a multi-axial constitutive soil model in Hercules, one of SCEC’s three-dimensional wave propagation codes for regional scale earthquake simulations. Our overarching goal is to compute the effects of shallow crust... more	18020
Poster 131	Geodesy	Optimal GNSS observations in Southern California Eileen Evans, Sarah Minson We evaluate the current Global Navigation Satellite Systems (GNSS) observation network in southern California to 1) quantify the relative information provided by expanding the network to include seafloor observations, and 2) to identify optimal... more
Poster 169	FARM	The composition and structure of shallow portions of the San Andreas and San Gabriel Faults James Evans, Rebekah Reimann, Caroline Studnicky, Kelly Bradbury We investigate the composition and structure of the upper 2 km of strike-slip faults by examining core from two geotechnical investigations in the San Andreas (SAF) and San Gabriel Fault (SGF) zones. Seven steeply north inclined cores from Lake... more	18077
Poster 273	SAFS	Characterization of Faulting at the San Andreas Oasis in the Dos Palmas Preserve Using Ground-based Magnetics, VLF and DC Resistivity Drew Faherty, Stacey Petrashek, Raul Contreras, Nathan Pulver The San Andreas Oasis is located on the northeast side of the Salton Sea, within the Dos Palmas Preserve at the base of the Orocopia Mountains. This Oasis, among other oases and springs in the Preserve, are associated with the Hidden Springs Fault (... more
Poster 073	Seismology	Investigating microearthquake finite source attributes with IRIS Community Wavefield Demonstration Experiment in Oklahoma Wenyuan Fan, Jeff McGuire An earthquake rupture process can be kinematically described by rupture velocity, duration and spatial extent. These key kinematic source parameters provide important constraints on earthquake physics and rupture dynamics. In particular, core... more	17177
Poster 319	CEO	Lab Talk with Laura: STEM research meets comedy on the radio Laura Fattaruso In January 2018 I started producing a weekly STEM-themed radio show, Lab Talk with Laura, on the UMass Amherst radio station WMUA. The show is also distributed as a podcast on iTunes and Soundcloud, and promoted via Facebook and Twitter. I host each... more
Talk Tue 08:30	FARM	On the possibility of earthquake rupture through clay-rich faults Daniel Faulkner, Marieke Rempe, John Bedford, C Sanchez-Roa, C Boulton, S den Hartog Many mature, large-displacement fault zones exhibit a clay-rich fault core. This low porosity, low permeability material inhibits the migration of fluid and consequently small changes in porosity produce pore pressure transients that take... more
Poster 086	Seismology	Combining back-projection and matched filter in detecting offshore seismicity: Application to NE Japan subduction zone Tian Feng, Lingsen Meng In this project, we combine the Back Projection (BP) imaging and match-filter detection (MF) techniques to improve the capability of detecting offshore events. The MF method searches for similar patterns by cross-correlating waveforms of known... more
Poster 139	Geodesy	Measurements of 3-component, time-dependent deformation using Sentinel-1 SAR interferometry and continuous GPS data Yuri Fialko, Ekaterina Tymofyeyeva Interferometric Synthetic Aperture Radar (InSAR) data are increasingly used to image deformation due to active faults. Frequent InSAR acquisitions are expected to provide an improved signal to noise ratio for low-amplitude deformation signals.... more	17046
Poster 261	SAFS	Revisiting the Cajon Pass Quaternary Terraces with Geochronology dating implications for the long term slip rates of the San Jacinto and San Andreas systems Paula Figueiredo, Ray Weldon, Lewis Owen The San Andreas (SA) and the San Jacinto (SJ) Faults are the two major active fault systems in Southern California, accommodating 50-70 % of the 52 mm/yr North America–Pacific plate boundary motion. At the Cajon Pass (CP) area, both fault systems... more
Poster 037	EFP	Statistics of seismicity associated with a sequence of explosive eruptions at Kilauea, Hawaii Rebecca Fildes, Louise Kellogg, Donald Turcotte, John Rundle Beginning about June 4, 2018, a remarkable quasi-periodic sequence of explosive eruptions began at Kilauea volcano, Hawaii. Explosive summit eruptions began after the M=6.9 earthquake on May 4, 2018 and the decay of its aftershock sequence. These... more
Poster 079	Seismology	Effective stress drop and aseismic deformation Tomas Fischer, Sebastian Hainzl The concept of effective stress drop of a seismic sequence is based on the cumulative seismic moment and area activated by seismic ruptures. The analysis of end-member cases of clustered seismicity shows that the estimated effective stress drop of a... more
Poster 283	Seismology	Preliminary evidence for localized lithospheric deformation in the western Basin and Range and Walker Lane from Ps receiver function analysis Heather Ford Cenozoic-aged extension within portions of the Basin and Range has been estimated to be as large as 250 km, however others put estimates lower. A question that remains today is how strain is accommodated within the lithosphere beneath the Basin and... more	17165
Poster 180	FARM	Does effective stress have reduced sensitivity to pore pressure at seismogenic depths? Patrick Fulton, Szu-Ting Kuo, Hiroko Kitajima, Xiaoda Liu The importance of fluids in fault mechanics is well-recognized. Pore pressure is known to affect elastic deformation and brittle failure through its control on effective stress, where Effective Stress = Stress – alpha * Pore Pressure. However,... more	17245
Poster 292	CS	Unraveling earthquake dynamics through large-scale multi-physics simulations Alice-Agnes Gabriel, Stephanie Wollherr, Thomas Ulrich, Elizabeth Madden, Kenneth Duru, Duo Li Earthquakes are highly non-linear multiscale problems, encapsulating the geometry and rheology of propagating shear fractures that render the Earth’s crust and emanate destructive seismic waves. Using physics-based earthquake scenarios, modern... more	17075
Poster 048	EFP	Aftershock Matters Nicole Gage, David Wald, Kristin Marano Aftershocks can be inconsequential, or they can cause more extensive damage and more human casualties than their associated mainshocks. Most studies of aftershocks focus on characterizing statistical properties such as their likelihood, frequency,... more
Poster 031	CISM	Probabilities of Earthquakes in the San Andreas Fault System: Estimations from RSQSim Simulations Jacquelyn Gilchrist, Thomas Jordan, Kevin Milner The RSQSim model of Dieterich & Richards-Dinger (2010) is now capable of simulating very long (> 10^6 yrs) catalogs of M ≥ 5 earthquakes using the same fault geometry and slip rates as UCERF3 (Field et al., 2014), the latest seismic hazard ... more
Poster 089	Seismology	Rapid induced seismicity mitigation and its impact on aftershock productivity in Oklahoma Thomas Goebel, Zach Rosson, Emily Brodsky, Jake Walter Induced earthquakes provide a rare opportunity to study the connection between stress perturbations and resulting seismic activity. Fluid-injection can directly trigger seismic events, leading to elevated background rates, but may also result in... more
Poster 278	SAFS	Looking Ahead by Looking Down – Potential Applications of Very High Resolution Drone-Based Imagery for Tectonic Geomorphology Allen Gontz, Chelsea Blanton, Thomas Rockwell, Joshua Kelly Geomorphic analyses have relied on various methods throughout the recent past. In the 1940’s, aerial imagery changed the way we look at the surface of the Earth. The 1980’s brought Landsat and new capacity to image the surface of the Earth. In the... more	18038
Poster 013	GM	Sampling Parametric Rupture Variability using Broadband Ground Motion Simulations Robert Graves Observations from past earthquakes show the rupture process can be complex, exhibiting spatial variations in rupture speed, slip and slip rate, as well as geometric roughness of the faulting surface. Incorporating these features within kinematic... more
Poster 115	Geodesy	Using a dense GPS array as a strain meter on the Anza section of the San Jacinto fault Margaret Grenier, Yuri Fialko The San Jacinto fault is the most actively seismic fault in Southern California and has produced a series of moderately (M>6) sized earthquakes in the last 120 years. Within the main strand of the San Jacinto fault there is a ~20 km long locked... more
Poster 168	SDOT	Afterslip and Viscoelastic Processes and Their Relation with Seismic Activity: An Example from the Study of the Mw 7.2 El Mayor-Cucapah Earthquake (Mexico) Adriano Gualandi, Zhen Liu Different aseismic deformation processes perturb the stress field in the brittle crust, and consequently influence the seismic activity. Afterslip and viscoelastic relaxation are usually invoked to explain the observed displacements after a major... more
Poster 311	CEO	2018 USEIT: Using Machine Learning to Forecast Earthquakes Anthony Guerra, Brandon Ho, Varduhi Kababjyan, Ramon Mei, Tomoe Mizutani, Tiffany Streitenberger, Shalani Weerasooriya, Jordan Wolz, Guillermo Beas, Shengyu Wang, Abhijit Kashyap, Jacquelyn Gilchrist As part of the 2018 Undergraduate Studies in Earthquake Information Technology (UseIT) internship program, the Machine Learning (ML) team was challenged to investigate how ML might be used to derive statistical earthquake forecasts from... more

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