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 355

SCEC ID	Category	Title and Authors	SCEC Award
Poster 090	Geology	Published Quaternary geochronologic data show the importance of dating geomorphic surfaces with multiple geochronometers Peter Gold, Whitney Behr Quaternary fault slip rates rely on geochronologic dating methods for interpreting the ages of displaced geomorphic surfaces such as alluvial fans and fluvial terraces. Most commonly employed among these are cosmogenic exposure dating, uranium-... more
Poster 256	Seismology	Seismogeodetic Observations of the June 10, 2016 M5.2 Borrego Springs Earthquake Dara Goldberg, Jessie Saunders, Jennifer Haase, Yehuda Bock Seismogeodesy is the optimal combination of high rate GPS observations and strong motion accelerations in a Kalman filter to produce broadband velocity and displacement waveforms, including accurate measure of the static offset. This approach... more
Poster 262	Seismology	Seismic Evidence for Splays of the Eureka Peak Fault beneath Yucca Valley, California Mark Goldman, Rufus Catchings, Joanne Chan, Robert Sickler, Coyn Criley, Dave O'Leary, Alan Christensen In April 2015, we acquired high-resolution P- and S-wave seismic data along a 3.1-km-long, E-W-trending profile in Yucca Valley, California. Our seismic survey was designed to locate possible sub-parallel faults of the Eureka Peak Fault, which... more
Poster 146	Geodesy	Guadalupe Island as a constrain for earthquake hazard at Californias's shoreline Jose Javier Gonzàlez-Garcìa, Alejandro Gonzalez-Ortega, John Galetzka, Christian Walls, Hebert Martinez-Barcena, Juan Robles For the purpose of tectonic-earthquake hazard in the Pacific-NorthAmerica western border region, we look for high accuracy of relative plate boundary instead of having global coverage (e.g. GEODVEL, MORVEL56, ITRF2008PPM, GSRM2); by imposing... more
Poster 179	Seismology	Investigating tremor sources along the San Andreas Fault using integrated static and dynamic stress models Hector Gonzalez-Huizar, Sandra Hardy, Bridget Smith-Konter Ambient and triggered tectonic tremors have been reported near the creeping to locking transition zone along the Parkfield-Cholame section of the San Andreas Fault, as well as in the San Jacinto and Calaveras Faults. Tremors dynamically triggered by... more	14165
Poster 155	Geodesy	Geodetic moment accumulation and seismic release in northern Baja California, Mexico Alejandro Gonzalez-Ortega, Jose Javier Gonzàlez-Garcìa, David Sandwell We have analyzed all available GPS data from northern Baja California, Mexico, covering the period 1993-2008, in order to estimate the strain rate and seismic moment accumulation rate during the interseismic period prior to the 2010, Mw 7.2 El Major... more
Poster 035	FARM	Laboratory Earthquakes Nucleated by Fluid Injection Marcello Gori, Vito Rubino, Ares Rosakis, Nadia Lapusta Fluids play an important role in earthquake source processes. Numerous field observations have highlighted the connection between fluids and faulting in triggering events ranging from earthquakes to creeping motion. Our newly developed laboratory... more
Poster 041	FARM	How we learned to stop worrying and start loving bulk nonlinearities Setare Hajarolasvadi, Ahmed Elbanna The Finite Difference (FD) and Boundary Integral (BI) methods have been extensively used in computational earthquake dynamics. The FD method provides a powerful tool for simulating a variety of rupture scenarios including nonplanar faults and bulk... more
Poster 263	Seismology	A derivation of the median ratios between different definitions of horizontal component of ground motions in Central and Eastern United States Alireza Haji-Soltani, Shahram Pezeshk A single ground motion intensity measure, typically spectral acceleration (SA), is required as the main input in deriving empirical Ground Motion Prediction Equations (GMPEs). There has been a debate for years on which of the two horizontal ground... more
Talk 9/13 10:30	Geodesy	The Ups and Downs of Southern California: Mountain Building, Sea Level Rise, and Earthquake Potential from Geodetic Imaging of Vertical Crustal Motion William Hammond, Geoffrey Blewitt, Corné Kreemer, Reed Burgette, Kaj Johnson, Charles Meertens, Frances Boler Contemporary tectonic uplift in California and Nevada is an active part of ongoing plate boundary processes driving earthquakes. However, it has so far been difficult to confidently resolve and interpret uplift patterns. The challenges are twofold... more	14209
Poster 096	Geology	Late Quaternary slip rates from offset alluvial fan surfaces along the Central Sierra Madre fault, southern California Austin Hanson, Reed Burgette, Katherine Scharer, Nikolas Midttun The Sierra Madre fault (SMF) is an east-west trending reverse fault system along the southern flank of the San Gabriel Mountains near Los Angeles, California. The ~140 km long SMF is separated into four segments; we focus on the multi-stranded, ~85... more	15179
Poster 014	SDOT	Can tectonic loading be observed as interseismic stress rotation? Jeanne Hardebeck The shear stress on major faults evolves through the seismic cycle, due to tectonic stress loading, coseismic stress release, and earthquake stress transfer. If the seismic cycle stresses are small compared to the background differential stress,... more
Poster 047	FARM	Aiming for Validation – The SCEC/USGS Dynamic Earthquake Rupture Code Comparison Exercise Ruth Harris The SCEC/USGS Dynamic Earthquake Rupture Code Group is an international collaboration among scientists who use 3D spontaneous rupture computer codes to numerically simulate physics-based earthquake rupture and the resulting ground motions. In the... more	16056
Poster 225	Seismology	Characterizing Seismicity with High-Precision Relocations of Recent Earthquake Sequences in Eastern California and Western Nevada Rachel Hatch, Daniel Trugman, Ken Smith, Peter Shearer, Rachel Abercrombie Recent earthquake sequences and swarms in eastern California and western Nevada (2010 to present) have caught the attention of the public and emergency responders. Our objective is to characterize this seismicity by computing high-quality event... more
Poster 017	SDOT	Progress towards deriving the three-dimensional coseismic deformation field along the White Wolf fault during the Mw ~7.3 1952 Kern County earthquake Alexandra Hatem, James Dolan, Chris Milliner We present preliminary results of our efforts to constrain coseismic surface deformation during the Mw~7.3 1952 Kern County earthquake. We are using a modified workflow to difference point clouds derived from legacy air photos taken before and after... more	15200
Poster 261	Seismology	Optical Fiber Strainmeters: Developing Higher Dynamic Range and Broader Bandwidth Billy Hatfield, Mark Zumberge, Frank Wyatt, Duncan Agnew We have been developing near-surface horizontal strainmeters and vertical borehole strainmeters that use passive optical fibers as their primary sensing element: optical-fiber strainmeters, or OFS. These instruments are useful in two areas. First,... more
Poster 211	Seismology	Rapid Rupture Directivity Determination of Moderate Dip-Slip Earthquakes with the Reduced Finite Source Approximation Xiaohui He, Sidao Ni Moderate (M5.5-7) dip-slip earthquakes are frequent in both interplate and intraplate regions, and some of them could cause severe damage to buildings and even casualties. For an earthquake with up-dip rupture, the hanging wall region usually... more
Talk 9/12 14:00	SDOT	How Sensitive are Inferred Stresses and Stressing Rates to Rheology? Clues from Southern California Deformation Models Elizabeth Hearn Variations in fault zone strength and lower lithosphere viscoelastic rheology have been shown to influence deformation patterns in fault systems over a range of time scales (e.g. Bird and Kong, 1994; Fay and Humphreys, 2005). Because of our mandate... more	15199, 16268
Poster 276	GMP	NGA 2 GMPE’s Under Predict Long-Period Near-Source Motions from Large Earthquakes Thomas Heaton, Becky Roh The recently constructed San Bernardino Law and Justice Center is an 11-story story steel building located 6 km from the San Andreas Fault. In order to mitigate strong shaking expected during the lifetime of this expensive structure ($400M), the... more
Poster 028	FARM	Laboratory investigation of friction along rock joints and identification of peaks in shear stiffness prior to the joint’s shear failure Ahmadreza Hedayat, John Hinton Laboratory studies of friction along synthetic and natural fault gauge materials have been instrumental in providing a better understanding of the fault deformation mechanisms and when combined with geophysical monitoring techniques, have been very... more
Poster 081	Geology	New Investigations on the Hollywood-Raymond Fault Zone, Los Angeles, California Janis Hernandez, Rufus Catchings, Robert Sickler, Mark Goldman South of the Transverse Ranges in southern California, the transition zone between the Hollywood and Raymond faults has been mapped as a series of left-stepping, E-NE-trending faults (Weber et al., 1980). Geomorphic expression of faulting in this... more
Poster 069	FARM	Coseismic Strengthening of the Shallow Subduction Megathrust Further Enhances Inelastic Wedge Failure and Efficiency of Tsunami Generation Evan Hirakawa, Shuo Ma The shallow portion (upper 5 – 10 km) of the subduction megathrust fault, governed by velocity-strengthening friction, has generally been considered to reduce near-trench slip and tsunamigenesis. However, Kozdon and Dunham (2013) showed that large... more
Poster 102	Geology	Observations from preliminary 1:24,000 scale bedrock mapping in the western Joshua Tree region: Potential connections between historic seismicity and evolving fault systems Ann Hislop, Robert Powell, Sean Bemis, David Moecher, Luke Sabala Bedrock mapping in the epicentral areas of the 1992 Joshua Tree earthquake (Mw 6.1) and Landers aftershocks (Mw 5.7, 5.8) south of Pinto Mountain Fault in southern California has further delineated the geometry, distribution, and relative chronology... more
Poster 195	Seismology	Dynamic stress triggering in the 2010-2011 Canterbury earthquake sequence Caroline Holden, Charles Williams, David Rhoades The Canterbury earthquake sequence started in 2010 with the M7.1 Darfield earthquake. It was followed by over 10,000 aftershocks including the tragic M6.2 February 2011 Christchurch earthquake and the latest M5.7 Valentine earthquake (Kaiser et al... more	16134
Poster 107	Geology	Fault Deformation and Segmentation of the Newport-Inglewood Rose Canyon, and San Onofre Trend Fault Systems from New High-Resolution 3D Seismic Imagery 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 165	Geodesy	Tracking Seasonal Influences on Stress Changes using Estimates of Anomalous Geodetic Strains Bill Holt, Meredith Kraner, Adrian Borsa, Alireza Bahadori Quantifying transient tectonic signals continues to reveal new insights into fault behavior and crust/mantle rheology [Segall and Matthews, 1997; McGuire and Segall, 2003; Freed and Bürgmann, 2004; Ji and Herring, 2012, 2013; Mavrommatis et al, 2014... more	16291
Poster 170	Seismology	Shear Wave Velocities in the Central Eastern United States Mehrdad Hosseini, Paul Somerville, Andreas Skarlatoudis, Jeff Bayless, Hong Kie Thio USARRAY and ANSS seismic stations provide an invaluable waveform dataset for studying ground motion attenuation in the Central and Eastern United States. However, the dataset is useful only after the site effects at each station are well understood... more
Poster 171	Seismology	Were the 1952 Kern County and 1933 Long Beach, California, Earthquakes Induced? Susan Hough, Victor Tsai, Robert Walker, Morgan Page, Seyed Hosseini Several recent studies have presented evidence that significant induced earthquakes occurred in a number of regions during the 20th century related to either production or early wastewater injection. We consider whether the Mw6.4 Long Beach and Mw7... more
Poster 259	Seismology	Spatial and temporal relationships between tremor and slip in large slow slip earthquakes on the Cascadia subduction zone Heidi Houston, Kelley Hall, David Schmidt Slow slip and tremor migrate in tandem along several subduction zones at about 8 km/day in large Episodic Tremor and Slip (ETS) events. These events occur downdip of the locked megathrust, and thus the updip limits of slow slip or tremor provide... more
Poster 160	Geodesy	The aseismic slip acceleration before the 2015 Illapel Mw 8.4 event from repeating earthquake observations Hui Huang, Lingsen Meng Recent studies provide evidence of accelerating short-term or long-term seismicity possibly accompanied by aseismic slip preceding large interplate earthquakes, such as the 2011 Tohoku-Oki Mw 9.0 earthquake and the 2014 Iquique Mw 8.2 earthquake.... more
Poster 157	Geodesy	Coseismic and postseismic deformation from the 2010 Mw 7.2 El Mayor-Cucapah Earthquake in Baja California: Lithospheric structure and deformation in the Salton Trough Mong-Han Huang, Haylee Dickinson, Andrew Freed, Eric Fielding, Roland Bürgmann, Alejandro Gonzalez-Ortega Coseismic and postseismic deformation from the 2010 Mw 7.2 El Mayor-Cucapah Earthquake in Baja California: Lithospheric structure and deformation in the Salton Trough The 2010 Mw 7.2 El Mayor-Cucapah (EMC) Earthquake ruptured about 120 km along... more
Poster 270	GMP	A Flexible and Memory-Efficient Displacement-Based Approach to Modeling Attenuation in Wave Propagation Md Monsurul Huda, Ricardo Taborda, Naeem Khoshnevis Attenuation in the form of energy losses due to internal friction is a major factor in wave propagation and ground motion simulation problems. These effects change the amplitude and dispersion characteristics of seismic waves, especially over large... more
Poster 282	GMSV	Site Response During And After Nonlinear Soil Behavior Has Occurred Kenneth Hudson Instrumented geotechnical field sites are designed to capture the infrequent but critically important in situ case histories of ground response, deformation, and liquefaction during significant earthquakes that generate high intensity ground shaking... more
Poster 242	Seismology	Tectonic tremor in the San Jacinto Fault, near the Anza Gap, detected by multiple mini seismic arrays Alexandra Hutchison, Abhijit Ghosh Using several detection and location methods, employing data from both network and mini high density seismic arrays, we detect several instances of non-volcanic tremor that are possibly located on the San Jacinto Fault (SJF) near the Anza Seismic... more	15164
Poster 288	GMSV	Validation of 3D velocity models using earthquakes with shallow slip: case study of the Mw6.0 2014 South Napa, California, event Walter Imperatori, Frantisek Gallovic Three-dimensional velocity models constitute a key element in strong ground motion modelling, e.g., earthquake hazard assessment. Their validation is typically based on modelling weak earthquakes with foci limited to depths greater than ~5km.... more
Poster 159	Geodesy	Toward Rapid, Robust Characterization of Subduction Zone Earthquakes: Application to the 2015 Illapel, Chile Earthquake Tisha Irwin, Gareth Funning Accurate and robust knowledge of earthquake source parameters is crucial for hazard assessment and disaster response. The short revisit interval and open and rapid data availability of the European Space Agency’s Sentinel-1 synthetic aperture radar... more
Talk 9/12 11:00	EFP	The bridge from earthquake geology to earthquake seismology David Jackson Recurrence intervals of large earthquakes exceed the instrumental earthquake record, so we rely on paleo-seismic and surface deformation evidence to infer long-term earthquake rates and recurrence statistics. Paleo-seismic studies generally imply... more	15201
Poster 149	Geodesy	New GPS Site Velocities in San Gorgonio Pass, Southern California and Preliminary Elastic Modeling Naomi Jahan, Matthew Peterson, Sally McGill, Joshua Spinler Campaign GPS observations have been collected from 23 new sites in San Gorgonio Pass 1-3 times per year since 2013. After 3 years of observations, consistent velocities are now available for these sites and are well constrained enough to support... more	16251
Poster 116	SoSAFE	The East Shoreline strand of the San Andreas Fault and its implications for the next Big One in southern California Susanne Janecke, Daniel Markowski, Roger Bilham, James Evans, Michael Bunds, Jack Wells, Jeremy Andreini, Robert Quinn The southern San Andreas Fault last ruptured about 1670 AD, and its southern tip could nucleate the next Big One (Shakeout summary). We use new geologic data along a 15-km long swath at the southernmost tip of the San Andreas Fault zone (SAFZ) to... more	12137
Poster 283	GMSV	Site amplification effects at Heathcote Valley, New Zealand, during the 2010-2011 Canterbury earthquakes Seokho Jeong, Brendon Bradley This poster presents a quantitative case study on the role of near surface site effects on the ground motion intensities at Heathcote Valley school station (HVSC), New Zealand, during the 2010-2011 Canterbury earthquake sequence, accounting for the... more
Poster 235	Seismology	Slip history of the 2016 Mw 7.0 Kumamoto earthquake: intra-plate rupture in complex tectonic environment Chen Ji, Jinglai Hao, Zhenxing Yao We have selected 14 3-component strong motion observations, combining with waveforms of teleseismic broadband body waves and long period surface waves of the 2016 Kumamoto mainshock to constrain its temporal and spatial distribution of slip. Our... more
Poster 066	FARM	Reconciling seismicity and geodetic locking depths on the Anza segment of the San Jacinto Fault Junle Jiang, Yuri Fialko The depth extent of fault locking can be independently estimated from seismic and geodetic observations. In Southern California, available observations for the San Andreas and San Jacinto Faults suggest a general agreement between the two estimates... more	16121
Poster 012	SDOT	Seasonal water storage modulating seismicity on California faults Christopher Johnson, Yuning Fu, Roland Bürgmann In California the accumulation of winter snowpack in the Sierra Nevada, surface water in lakes and reservoirs, and groundwater in sedimentary basins follow the annual cycle of wet winters and dry summers. The surface loads resulting from the... more	16006
Poster 301	EFP	Earthquake Number Forecasts Testing Yan Kagan, David Jackson We study the distributions of earthquake numbers in two global earthquake catalogs: Global Centroid-Moment Tensor (GCMT) and Preliminary Determinations of Epicenters (Monthly Listing) (PDE). The properties of these distributions are especially... more	16089
Poster 287	GMSV	Near source ground-motion modelling of the Canterbury aftershocks and implications for engineering metrics Anna Kaiser, Caroline Holden The 2010-2011 Canterbury earthquake sequence includes the 22 February 2011 Christchurch aftershock (Mw 6.2), the June 2011 Mw 6.0 aftershock, the December 2011 magnitude (Ml) 5.8 and 6.0 aftershocks and the February 2016 Mw5.7 Valentine’s day... more
Poster 091	Geology	Site-specific earthquake hazard characterization for Dhaka City, Bangladesh Mir Karim, Zillur Rahman, Maksud Kamal, Sumi Siddiqua Seismic hazard characterization is the foremost module for earthquake risk management in a seismically vulnerable region. The mega city Dhaka in Bangladesh is considered by many researchers as one of the riskiest cities in the world due to many non-... more
Poster 150	Geodesy	Vital Signs of the Planet: Southern California Education Contribute to Crustal Deformation Studies Within San Bernardino and Riverside Counties Dan Keck In conjunction with California State University, San Bernardino, Inland Empire middle school, high school, and community college teachers have used GPS to monitor movement along the San Andreas and San Jacinto faults within the Inland Empire, San... more	16251
Poster 162	Geodesy	Compaction-induced elevated pore pressure and creep pulsing in California faults Mostafa Khoshmanesh, Manoochehr Shirzaei The creeping segment of San Andreas Fault (CSAF) is recognized as a weak fault, namely, cannot sustain large earthquake stress drops. Moreover, variable creep rate constrained using kinematic models of geodetic and seismic data implies that the... more
Poster 269	GMP	Analysis of Q-factor’s parameters of Los Angeles through Simulation and Artificial Intelligence Naeem Khoshnevis, Ricardo Taborda The accurate solution of wave propagation problems requires the appropriate representation of energy losses due to internal friction. These losses are important because their mischaracterization can lead to over- or under-estimation of amplitudes... more	14022
Poster 326	CEO	Music of Earthquakes Debi Kilb, Daniel Trugman A new middle school class titled 'The Music of Earthquakes' was offered this summer as part of the Sally Ride Science Junior Academy for Girls (https://sallyridescience.com). Exploring the interplay between music and earthquakes, this... more

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