A5055265839- earthquake and tectonic studies
- Seismology and Earthquake Studies
- Geophysics and Gravity Measurements
- Earthquake Detection and Analysis
- GNSS positioning and interference
- Geological Modeling and Analysis
- Inertial Sensor and Navigation
- Distributed and Parallel Computing Systems
- Geological and Geochemical Analysis
- Scientific Computing and Data Management
- Seismic Waves and Analysis
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Landslides and related hazards
- Electromagnetic Simulation and Numerical Methods
- Electromagnetic Scattering and Analysis
- Geochemistry and Geologic Mapping
- Advanced Computational Techniques and Applications
- Ionosphere and magnetosphere dynamics
- Reservoir Engineering and Simulation Methods
- Soil Moisture and Remote Sensing
- Methane Hydrates and Related Phenomena
- Structural Health Monitoring Techniques
- Seismic Imaging and Inversion Techniques
- Criminal Justice and Corrections Analysis
- High-pressure geophysics and materials
Jet Propulsion Laboratory
2011-2022
Stanford University
2021
University of Southern California
2021
Palo Alto University
2021
California Institute of Technology
2000-2015
University of Arkansas at Little Rock
2011
Indiana University
2005
King's College London
2005
University of California, Irvine
2005
Indiana University Bloomington
2005
1 Introduction.- I Institutional and Cultural Patterns.- 2 Nature of Prison Exploitation.- 3 Setting Sexual Scene.- 4 Behavior, Orientation, Ethnicity.- II The Jockers, Punks, Sissies.- 5 Male Relationships.- 6 Punks in Prison.- 7 Behavior Attitudes the Homosexuals.- 8 Types Homosexuals III Reactions to Sex 9 Inmate Toward Homosexuality.- 10 Staff 11 Policy, Programs, Change.- Notes.- Appendix A: Questionnaires.- B: Tables.
Abstract This paper describes the methods used to estimate positions, velocities, breaks, and seasonal terms from daily Global Navigation Satellite System (GNSS) measurements. Break detection outlier removal have been automated so that decades of measurements thousands stations can be processed in a few hours. New are added, parameters updated every week. Model allow separation interseismic, annual, coseismic, postseismic signals. Tools available through GeoGateway ( http://geo-gateway.org )...
Abstract We present and discuss JTRF2014, the Terrestrial Reference Frame (TRF) Jet Propulsion Laboratory constructed by combining space‐geodetic inputs from very long baseline interferometry (VLBI), satellite laser ranging (SLR), Global Navigation Satellite Systems (GNSS), Doppler orbitography radiopositioning integrated submitted for realization of ITRF2014. Determined through a Kalman filter Rauch‐Tung‐Striebel smoother assimilating position observations, Earth orientation parameters,...
Abstract The current International Terrestrial Reference Frame is based on a piecewise linear site motion model and realized by reference epoch coordinates velocities for global set of stations. Although motions due to tectonic plates glacial isostatic adjustment dominate geodetic signals, at today's millimeter precisions, nonlinear earthquakes, volcanic activities, ice mass losses, sea level rise, hydrological changes, other processes become significant. Monitoring these (sometimes rapid)...
Abstract The 4 April 2010 M 7.2 El Mayor‐Cucapah earthquake that occurred in Baja California, Mexico and terminated near the U.S. Mexican border caused slip on Imperial, Superstition Hills, East Elmore Ranch Faults. pattern of was observed using radar interferometry from NASA's Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR) instrument collected 20–21 October 2009 12–13 2010. Right‐lateral 36 ± 9 14 2 mm Imperial Hills Faults, respectively. Left‐lateral Fault. widths zones...
Abstract The M w 6.0 South Napa earthquake of 24 August 2014 caused slip on several active fault strands within the West Fault Zone (WNFZ). Field mapping identified 12.5 km surface rupture. These field observations, near‐field geodesy and space geodesy, together provide evidence for more than ~30 deformation with a relatively complex distribution across number subparallel lineaments. Along ~7 section north epicenter, rupture is confined to single trace that cuts alluvial deposits,...
In 1906 the great San Francisco earthquake and fire destroyed much of city. As we approach 100-year anniversary that event, a critical concern is hazard posed by another such earthquake. this article, examine assumptions presently used to compute probability occurrence these earthquakes. We also present results numerical simulation interacting faults on Andreas system. Called Virtual California, can be times, locations, magnitudes simulated earthquakes fault in vicinity Francisco. Of...
Service-based geographic information system (GIS) technologies can enable an open-architecture cyberinfrastructure to provide standards-compliant data products and computing services for both earthquake research disaster planning response. Here, a service-based GIS framework is evaluated using examples from two science projects: QuakeSim E-Decider.
Abstract Tectonic motion across the Los Angeles region is distributed an intricate network of strike‐slip and thrust faults that will be released in destructive earthquakes similar to or larger than 1933 M 6.4 Long Beach 1994 6.7 Northridge events. Here we show regional thrust, strike‐slip, oblique are connected move concurrently with measurable surface deformation, even moderate magnitude earthquakes, as part a fault system accommodates north‐south shortening westerly tectonic escape...
Abstract We present a data‐driven approach to clustering or grouping Global Navigation Satellite System (GNSS) stations according observed velocities, displacements other selected characteristics. Clustering GNSS provides useful scientific information, and is necessary initial step in analysis, such as detecting aseismic transient signals (Granat et al., 2013, https://doi.org/10.1785/0220130039 ). Desired features of the data can be for clustering, including some subset displacement velocity...
A Global Positioning System (GPS) transmitter-receiver pair form a bistatic radar for ocean remote sensing when the receiving platform carries downlooking antenna capable of collecting GPS signal scattered off surface. The aggregate by and received in general configuration has been calculated representative geometries variety wind speeds directions, using integral equation method (IEM) combined with realistic correlation function (spectrum). role polarization reflected is investigated its...
In this manuscript, we introduce a framework for developing earthquake forecasts using Virtual Quake (VQ), the generalized successor to perhaps better known California (VC) simulator. We discuss basic merits and mechanics of simulator, present several statistics interest forecasting. also show that, though system as whole (in aggregate) behaves quite randomly, (simulated) sequences limited specific fault sections exhibit measurable predictability in form increasing seismicity precursory...
The M = 7.1 Hector Mine earthquake ruptured the Lavic Lake fault near Twentynine Palms, CA at 09:46 UTC October 16, 1999. Because it occurred eastern edge of Southern California Integrated GPS Network (SCIGN), a network permanent, continuously recording receivers for measuring crustal deformation field around Los Angeles, CA, was possible to determine associated with unprecedented speed and reliability. Thirty‐four stations recorded displacements over 3‐sigma level. measured can be modeled...
[1] Several common classes of model-free strain estimation techniques from geodetic deformation measurements were investigated to assess the systematic computational artifacts introduced into estimates different parameterizations. It is demonstrated that highly structured artifacts, which may be impossible distinguish real variations in strain, persistently appear rate field at and above spatial scale network samples field. These are biased by sampling, orientation sampling with respect...
We present the results of our participation in four phases Southern California Earthquake Center (SCEC) transient detection exercise (Lohman and Murray, 2013). In each phase, a blind test was conducted which sets synthetic Global Positioning Systems (GPS) data were released deadline set for submission results. For set, presence or absence events to be determined, location time specified. After all submissions received, ground‐truth information about any signals released. The generated by...
Abstract We use the 2017 Thomas fire and ensuing Montecito debris flow as a case study to demonstrate how application of various interferometric synthetic aperture radar postprocessing techniques can be used highlight scar major damage areas from flows. National Aeronautics Space Administration's airborne Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR) L‐band polarimetric (InSAR) for this study. Results that single image highlights burn areas. Coherence pairs show flow. An...
JPL's newly developed software for determining terrestrial reference frames, known as SREF (Square-root Reference frame Estimation Filter), has been used to produce JTRF2020, a combined determined from the input SINEX files submitted by IVS, IGS, ILRS, and IDS ITRF2020. SREF, being based on square-root information filter smoother, determines sequentially station position time series. For 525 GNSS, 194 DORIS, 116 SLR, 96 VLBI, or total of 931, series were used. Incorporating process noise in...