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 104	Geology	Towards morphologic and cosmogenic dating of paleoearthquake and fault slip rates in the Central Nevada Seismic Belt Tabor Reedy, Steven Wesnousky The Pleasant Valley Fault and Dixie Valley Fault are located approximately 30km and 90km south of Winnemucca NV, within the Central Nevada Seismic Belt a region of aligned, nearly continuous, historical normal-fault earthquakes that produced surface... more
Poster 105	Geology	Investigate fault zone hydrogeologic architectures by using water level tidal and barometric response Lian Xue, Emily Brodsky, Vincent Allegre, Patrick Fulton, L. Parker Beth , John Cherry Fault zone hydrogeologic architecture is critical to faulting processes; however, they are not well understood and difficult to measure in situ. Water levels inside conventional water wells can tap an artesian aquifer response to pressure head... more
Poster 106	Geology	Floods, storms, and the identification of wave-dominated deltas: Insights from ground-penetrating radar profiles of the Oxnard Plain Julie Zurbuchen, Alexander Simms Tsunamis often occur in tectonically active areas, where they pose a significant risk to property and life along low-elevation coastal regions. In California, tsunami studies have traditionally focused on the Cascadia Subduction Zone in the north,... more	16130
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 108	Geology	Geometric, kinematic, and temporal patterns of Quaternary surface rupture on the Eastern Pinto Mountain fault zone near Twentynine Palms, southern California Christopher Menges, Jonathan Matti, Stephanie Dudash Detailed geologic mapping along the eastern Pinto Mountain fault zone (PMfz) in the Twentynine Palms area reveals previously unrecognized time-space variations in internal geometry, kinematics, and Quaternary surface-rupture timing; these variations... more
Poster 109	Geology	Assessing evidence for connectivity between the San Diego Trough and San Pedro Basin fault systems, offshore Southern California. Jayne Bormann, Graham Kent, Neal Driscoll, Alistair Harding The seismic hazard posed by offshore faults for coastal communities in Southern California is poorly understood and may be considerable, especially when these communities are located near long faults that have the ability to produce large... more
Poster 110	Geology	Multi-scale Structural Characterization of the Mecca Hills Fault System in the NE block of the Southern San Andreas Fault System, California Kelly Bradbury, Amy Moser, Sarah Schulthies, James Evans We examine the structural architecture, mineralogy, and alteration of fault zones across a range of scales in the Mecca Hills in southern California. Our research group is focusing on outcrop-scale field and laboratory measurements of 4 well-exposed... more
Poster 111	Geology	Imaging fault scarps and fault zone evolution near an oceanic transform fault using high-resolution bathymetry Curtis Baden, George Hilley, Samuel Johnstone, Robert Sare, Felipe Aron, Holly Young, Christopher Castillo, Lauren Shumaker, Johanna Nevitt, Tim McHargue, Charles Paull Oceanic transform faults play a fundamental role in plate tectonics by linking spreading ridge segments to each other. While ubiquitous, they produce far fewer large earthquakes than faults along other tectonic boundaries. We use high-resolution (1... more
Poster 113	Geology	Seafloor expression of active transpressional faulting offshore Southern California Mark Legg, Simon Klemperer, Christopher Castillo, Marie-Helene Cormier, Michael Brennan, Katy Croff Bell, Dwight Coleman, Chris Goldfinger, Jason Chaytor Recent observations using Remotely Operated Vehicles (ROV) of the seafloor along active transpressional fault zones offshore southern California reveal the morphology of active fault ruptures in the deep marine environment. Pressure ridges were... more	16097
Poster 114	Geology	Surface slip behavior of the southern and central Alpine fault, New Zealand Jozi Pearson, Nicolas Barth The Alpine Fault (AF) is a major continental plate boundary between the Australian and Pacific plates, linking oppositely-dipping subduction zones in New Zealand. Due to its relative geometric simplicity, high slip rate, and quasi-regular earthquake... more
Poster 115	Geology	Rupture zone characteristics of the 2010 El Mayor-Cucapah (Mexico) earthquake revealed with differential lidar Lia Lajoie, Ed Nissen Recent geodetic studies of surface deformation in large earthquakes have started to make connections between rupture characteristics and the mechanics, geometry, and material properties of the host faulting. Here, we investigate these relationships... more
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 117	SoSAFE	Applying newly developed luminescence dating to alluvial fans in the Anza Borrego Desert, southern California Brittney Emmons, Seulgi Moon, Nathan Brown, Kimberly Blisniuk, Ed Rhodes Over recent decades, multiple geochronologic tools have been used to date various geomorphic offsets (e.g., alluvial fans, fluvial terraces), enabling long-term slip rate studies of active faults. In this study, we show the robustness of the newly... more
Poster 118	SoSAFE	New Holocene slip-rate sites along the Mojave San Andreas Fault near Palmdale, CA Elaine Young, Eric Cowgill, Katherine Scharer Geologic and geodetic slip rates for the Mojave segment of the San Andreas fault (MSAF) appear to be discrepant: the Quaternary geologic rate is as high as 37 mm/yr [1] while the geodetic slip rate is as low as ~15 mm/yr [2]. To better characterize... more	12198
Poster 119	SoSAFE	Preliminary late Pleistocene slip rate for the western Pinto Mountain fault, Morongo Valley, southern California Katherine Gabriel, Doug Yule, Richard Heermance The northern Coachella Valley region of the San Andreas fault (SAF) system in southern California is complicated by overlapping, active strands and its intersection with prominent, secondary structures such as the Pinto Mountain fault. Recent work... more	16194
Poster 120	SoSAFE	High-resolution imaging of the San Andreas Fault around San Gorgonio Pass using fault zone head waves and double-difference tomography, with implications for large earthquake ruptures Pieter-Ewald Share, Yehuda Ben-Zion, Clifford Thurber, Haijiang Zhang, Hao Guo We attempt to clarify the seismic velocity structure within and around the complex San Gorgonio Pass (SGP) “structural knot” of the San Andreas Fault (SAF) using fault zone headwaves (FZHW) and a new double-difference tomography code incorporating... more
Poster 121	SoSAFE	Comparison of the rupture history of the southern San Andreas fault with empirical data on fault displacement and rupture length Katherine Scharer Offset geomorphic features provide estimates of slip used to derive paleoearthquake moment magnitude based on empirical relationships from historic ruptures (e.g., Wells and Coppersmith, 1994; Wesnousky, 2008). Obtaining these measurements is... more
Poster 122	SoSAFE	Sedimentary provenance constraints on the Quaternary faulting history of the Mission Creek fault strand, southern San Andreas Fault Zone, CA Julie Fosdick, Kimberly Blisniuk, Louis Wersan Quaternary alluvial fan deposits along the foothills of the San Bernardino Mountains record sediment dispersal from upland catchments across the Mission Creek fault strand of San Andreas fault in the San Gorgonio Pass, CA, and thereby yield key... more	14107
Poster 123	SoSAFE	Geologic framework of the El Casco 7.5’ quadrangle: southwestern gateway to the San Gorgonio Pass knot in the San Andreas Fault zone Jonathan Matti The El Casco 7.5' quadrangle is located at the SW portal of San Gorgonio Pass (SGP), where Quaternary contractional deformation in SGP gives way to transtensional deformation associated with the right-lateral San Jacinto Fault. Important... more
Poster 124	SoSAFE	Slip variability and temporal clustering along the Imperial fault at Mesquite Basin, Imperial Valley, California, and possible through-going rupture to the San Andreas fault Aron Meltzner, Thomas Rockwell, Rebecca Tsang, Paula Figueiredo Paleoseismic trenches across the Mesquite Basin section of the Imperial fault revealed several channels that cross the fault at a high angle and that are displaced in the subsurface. These channels incised into and are embedded within lacustrine... more	07007
Poster 125	SoSAFE	Work in progress to estimate a Latest Pleistocene slip rate for the Banning Strand of the San Andreas Fault near North Palm Springs Sally McGill, Paula Figueiredo, Lewis Owen Existing late Pleistocene slip rate estimates for the southern San Andreas fault reveal high rates of slip on the Mission-Mill Creek strand in the Indio Hills but very low rates on that strand farther northwest in the San Bernardino Mountains. The... more	15182
Poster 126	SoSAFE	Isochron burial dating of paleosols within the Whitewater Fan, northern Coachella Valley, California Nathaniel Lifton, Richard Heermance, Doug Yule, Brittany Huerta Remnant alluvial fan surfaces are ubiquitous features across the San Gorgonio Pass (SGP), distinguished by their perched location 50-150 m above the active channels and dark red, >1.5m thick soil horizons. Their potential utility in constraining... more	15135
Poster 127	SoSAFE	Holocene geologic slip rate for the Mission Creek fault at the Three Palms site in the Indio Hills Juan Munoz, Whitney Behr, Warren Sharp, Rosemarie Fryer, Peter Gold Slip on the southern San Andreas fault in the northwestern Coachella Valley in Southern California is partitioned between three strands, the Mission Creek, Garnet Hill, and Banning strands. In the vicinity of the Indio Hills, the NW striking Mission... more	15142, 16057
Poster 128	SoSAFE	Testing the shorter and variable recurrence interval hypothesis along the Cholame segment of the San Andreas Fault Alana Williams, Ramon Arrowsmith, Sinan Akciz, Thomas Rockwell, Lisa Grant Ludwig, Sally Branscomb The Cholame segment of the San Andreas Fault interacts with the Parkfield segment to the northwest with its creep and M6 earthquakes, and the locked Carrizo segment to the southeast. Although offset reconstructions exist for this ~75 km reach,... more
Poster 129	SoSAFE	Mapping fault creep, frictional properties, and unrecognized active structures with dense geodetic data in the Imperial Valley, Southern California Eric Lindsey, Yuri Fialko The Imperial-Mexicali valley is well known as an area of significant earthquake hazard, but it remains a challenging target for geodetic studies because of agricultural and geothermal activity which obscures both short- and long-term deformation and... more
Poster 130	SoSAFE	Investigating the age and origin of small offsets at Van Matre Ranch along the San Andreas Fault in the Carrizo Plain, California James Salisbury, Ramon Arrowsmith, Thomas Rockwell, Sinan Akciz, Nathan Brown, Lisa Grant Ludwig Small displacement fault-offset features (<10’s of m) are rarely dated, making it challenging to attribute slip to dated earthquakes. We investigated the ages of subtle fluvial depressions previously interpreted as beheaded channels representing... more	15139, 16201
Poster 131	SoSAFE	Activity of the Mill Creek and Mission Creek strands of the San Andreas fault through the San Gorgonio Pass region Alex Morelan, Michael Oskin, Judith Chester, Daniel Elizondo We present new observations that constrain the recent slip history of the Mill Creek and Mission Creek strands of the San Andreas fault. These faults are the northern strands of a complex series of strike-slip and thrust faults through the San... more	15202
Poster 132	Geodesy	Interpreting Oligocene Paleogeography in Southern California Using a Provenance Analysis of the Sespe Formation Carl Swindle, Parker Clarke The Sespe Formation is a lithified fluvial system that was deposited during the Oligocene. Previous geological investigations aimed at identifying the origins of the Sespe Formation have arrived at conflicting conclusions. This project assists in... more
Poster 133	Geodesy	High-Resolution Topographic Mapping of Active Faults in Southern California with Satellite Optical Imagery William Barnhart, Michael Willis, Terryl Bandy, Rich Briggs, Brianna Morales, Mark Faney Digital elevation models (DEMs) provide a core data set for many studies of active tectonics. They allow for the identification and quantification of fault offsets, modeling of localized and regional fluvial responses to vertical and lateral fault... more	16147
Poster 134	Geodesy	Surface slip rate of the Imperial Fault estimated from remote controlled quadcopter photogrammetry John DeSanto, David Sandwell In recent years, advances in photogrammetry have allowed remote controlled quadcopters to emerge as a useful tool for remote geological surveying. These tools allow pilots to collect photographic data of difficult to reach outcrops and create a... more	16072
Poster 135	Geodesy	Seventy-two years of Surface Creep on the North Anatolian fault at Ismetpasa: Implications for the southern San Andreas and Hayward faults Roger Bilham, Haluk Ozener, David Mencin, Asli Dogru, Semih Ergintav, Ziyadin Cakir, Alkut Aytun, Bahadir Aktug, Onur Yilmaz, Wade Johnson, Glen Mattioli Surface creep on the North Anatolian fault was first recognized in 1969 in the form of an offset wall that had been constructed across the fault 13 years after the 1944 Mw=7.4 Bolu/Gerede earthquake. Publications by Ambraseys (1970) and Aytun (1982... more
Poster 136	Geodesy	Fault creep observed on the Maacama and Rodgers Creek faults, northern California using PS-InSAR Jerlyn Swiatlowski, Gareth Funning Fault creep north of the San Francisco Bay Area has been observed in a few discrete locations, along the Maacama and Rodgers Creek faults, but the distribution of creep along these faults are not mapped in detail. This is due to a high degree of... more
Poster 137	Geodesy	InSAR observations in Southern California Rowena Lohman, Kyle Murray We present InSAR time series results over Southern California, with a focus on the comparison between imagery from different platforms and spanning different time periods in the Riverside area. We use a processing approach that combines aspects of... more	15167
Poster 138	Geodesy	Characterization of fault motions observed with UAVSAR. Jay Parker, Andrea Donnellan, Scott Hensley, Margaret Glasscoe Publically available data from the Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR), which measures deformation between repeat visits, provide an excellent opportunity for characterizing fault motions. These include the main shock fault... more
Poster 139	Geodesy	Toward the 3-component Crustal Motion Model: Integration of Sentinel-1A SAR interferometry and continuous GPS in the Los Angeles-Western Mojave area Ekaterina Tymofyeyeva, Homan Lau, Yuri Fialko The new Sentinel-1 mission, launched by the European Space Agency in April 2014, provides extensive coverage at high spatial resolution and frequent revisit intervals, which can dramatically improve measurements of secular and transient deformation... more	16301
Poster 140	Geodesy	Combination of GPS and InSAR Data for Crustal Deformation Mapping Zhen Liu, Zheng-Kang Shen, Cunren Liang We are developing an approach to integrate GPS and InSAR data to generate 3-dimensional crustal motion map. Point-based discrete GPS measurements are first interpolated to produce continuous 3-D vector map at common grids covered by the InSAR data,... more
Poster 141	Geodesy	The SCEC Community Geodetic Model V1: Horizontal Velocity Grid David Sandwell, Yuehua Zeng, Zheng-Kang Shen, Brendan Crowell, Jessica Murray, Robert McCaffrey, Xiaohua Xu The SCEC community is constructing and updating a suite of models for the Southern California region to facilitate cross-disciplinary research (CFM, CVM, CGM, CSM, and CRM). Here we are concerned with the development of the Community Geodetic Model... more	16072
Poster 142	Geodesy	Steady and time-dependent strain rate maps of California from inversion of GPS time series Robert McCaffrey The GPS displacement time series from the Plate Boundary Observatory (PBO), Crustal Motion Model 4 (Shen et al., 2011), the Pacific Northwest (McCaffrey et al., 2013), University of Nevada Reno (UNR) and others are used to estimate time-dependent... more	16083
Poster 143	Geodesy	Comparison of GPS Strain Rate Computing Methods and Their Application Yanqiang Wu Using modeled and simulated data for comparison of several methods to compute GPS strain rate fields in terms of their precision and robustness reveals that least-squares collocation is superior. Large scale (75°E–135°E and 20°N–50°N) analyses of 1... more
Poster 144	Geodesy	The California Plate Boundary Observatory GPS-GNSS Network Christian Walls, Doerte Mann, Ryan Turner, Andre Basset, Shawn Lawrence, Kenneth Austin, Stephen Dittman, Karl Feaux, Glen Mattioli The EarthScope PBO GPS-GNSS network in California, funded by the NSF and operated by UNAVCO, is comprised of 599 permanent GPS and GNSS stations spanning three principal tectonic regimes and is administered by separate management regions (Subduction... more
Poster 145	Geodesy	USGS Southern California GPS Network Daniel Determan, Aris Aspiotes, Derik Barseghian, Kenneth Hudnut, Keith Stark The USGS Pasadena field office now operates 140 permanent, continuously-operating Global Positioning System monitoring stations as part of the Southern California GPS Network (SCGN). The SCGN network has grown and modernized significantly over the... 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 147	Geodesy	Geodetic slip rate estimates in California, and their uncertainties Eileen Evans Current understanding of the seismic potential of faults in California is limited in part by our ability to resolve spatial and temporal changes in fault slip rates across the Pacific-North American plate boundary, and quantify their uncertainties.... more
Poster 148	Geodesy	Strain accumulation on faults beneath Los Angeles: a geodesy-based picture accounting for the effects of sedimentary basins and anthropogenic surface deformation Chris Rollins, Donald Argus, Walter Landry, Sylvain Barbot, Jean-Philippe Avouac The Los Angeles region is contracting at ~8 mm/yr in the N 5° E direction due to the misalignment of the Mojave section of the San Andreas Fault with the direction of relative Pacific-North American plate motion. This contraction is accommodated by... more
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 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 151	Geodesy	Is the CFM5.0 an Improvement? Evidence from Mechanical Models of the Western Transverse Ranges Region Scott Marshall, Gareth Funning, Susan Owen The SCEC Community Fault Model (CFM) is a widely-used product that has existed for well over a decade and has seen numerous revisions. As with all community-derived products, testing the accuracy and performance of the model is key to further... more	14040, 15079, 16171, 13056
Poster 152	Geodesy	Constraining Interacting Fault Models in the Salton Trough with Remote Sensing Data Margaret Glasscoe, Jay Parker, Andrea Donnellan, Gregory Lyzenga, Chris Milliner Constraining the distribution of slip and determining the behavior of fault interactions is a complex problem. Field and remotely sensed data often lack the necessary coverage to fully resolve fault behavior. However, realistic physical models may... more
Poster 153	Geodesy	Single station automated detection of transient deformation in GPS time series with the relative strength index: A case study of Cascadian slow-slip Brendan Crowell, Yehuda Bock, Zhen Liu The discovery of transient slow-slip events over the past decades has changed our understanding of tectonic hazards and the earthquake cycle. Proper geodetic characterization of slow-slip events is necessary for studies of regional interseismic,... more
Poster 154	Geodesy	Estimating secular velocities from GPS data contaminated by postseismic motion at sites with limited pre-earthquake data Jessica Murray, Jerry Svarc Constant secular velocities estimated from Global Positioning System (GPS)-derived position time series are a central input for modeling interseismic deformation in seismically active regions. Both postseismic motion and temporally correlated noise... more

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