A5051538825- earthquake and tectonic studies
- Geological and Geochemical Analysis
- Earthquake Detection and Analysis
- High-pressure geophysics and materials
- Seismology and Earthquake Studies
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Seismic Waves and Analysis
- Landslides and related hazards
- Seismic Imaging and Inversion Techniques
- Geological and Geophysical Studies
- Geophysics and Gravity Measurements
- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Geochemistry and Geologic Mapping
- Methane Hydrates and Related Phenomena
- GNSS positioning and interference
- Geological Modeling and Analysis
- Geotechnical and Geomechanical Engineering
- Rock Mechanics and Modeling
- Geophysical Methods and Applications
- Geological Studies and Exploration
- Geological and Tectonic Studies in Latin America
- Geophysics and Sensor Technology
- Geological and Geophysical Studies Worldwide
- Geological formations and processes
University of California, Berkeley
2016-2025
Planetary Science Institute
2016-2025
Université Savoie Mont Blanc
2024
Université Grenoble Alpes
2024
Institut des Sciences de la Terre
2024
Université Gustave Eiffel
2024
Institut de Recherche pour le Développement
2024
Centre National de la Recherche Scientifique
2024
Geological Survey of Israel
2024
Berkeley Geochronology Center
2005-2024
Research Article| September 01, 2004 Continuous deformation of the Tibetan Plateau from global positioning system data Pei-Zhen Zhang; Zhang 1State Key Laboratory Earthquake Dynamics, Institute Geology, Chinese Administration, Beijing 100029, China, and State Loess Quaternary IEE, CAS, Xi'an, China Search for other works by this author on: GSW Google Scholar Zhengkang Shen; Shen 2State Department Earth Space Sciences, University California, Los Angeles, California 90024, USA Min Wang; Wang...
Synthetic aperture radar interferometry (InSAR) from Earth-orbiting spacecraft provides a new tool to map global topography and deformation of the Earth’s surface. Radar images taken slightly different viewing directions allow construction digital elevation models meter-scale accuracy. These data sets aid in analysis interpretation tectonic volcanic landscapes. If surface deformed between two image acquisitions, displacement with tens-of-meters resolution subcentimeter accuracy can be...
Rock-mechanics experiments, geodetic observations of postloading strain transients, and micro- macrostructural studies exhumed ductile shear zones provide complementary views the style rheology deformation deep in Earth's crust upper mantle. Overall, results obtained small-scale laboratory experiments robust constraints on mechanisms viscosities at natural conditions. Geodetic inferences viscous strength mantle are consistent with flow rocks temperatures water contents determined from...
We derive a detailed horizontal velocity field for the southeast borderland of Tibetan Plateau using GPS data collected from Crustal Motion Observation Network China between 1998 and 2004. Our results reveal complex deformation that indicates crust is fragmented into tectonic blocks various sizes, separated by strike‐slip transtensional faults. Most notably, regional includes 10–11 mm/yr left slip across Xianshuihe fault, ∼7 Anninghe‐Zemuhe‐Xiaojiang fault zone, ∼2 right shear zone trending...
We invert 115 differential interferograms derived from 47 synthetic aperture radar (SAR) scenes for a time‐dependent deformation signal in the Santa Clara valley, California. The is calculated by performing linear inversion that solves incremental range change between SAR scene acquisitions. A nonlinear extracted ERS InSAR data without imposing model of expected deformation. In cumulative land uplift observed during period 1992 to 2000 with maximum 41 ± 18 mm centered north Sunnyvale. Uplift...
High-resolution interferometric synthetic aperture radar (InSAR) permanent scatterer data allow us to resolve the rates and variations in of slow-moving landslides. Satellite-to-ground distances (range changes) on landslides increase at 5 7 millimeters per year, indicating average downslope sliding velocities from 27 38 year. Time-series analysis shows that displacement occurs mainly during high-precipitation season; 1997–1998 El Niño event, range change increased as much 11 The observed...
Abstract We evaluate the benefits of space‐derived ground deformation measurements for basin‐wide characterization aquifer‐system properties and groundwater levels. use Interferometric Synthetic Aperture Radar (InSAR) time series analysis ERS, Envisat, ALOS SAR data to resolve 1992–2011 in Santa Clara Valley, California. T‐mode principal component successfully isolates temporally variable patterns embedded multidecadal series. The reveal uplift at 0.4 cm/yr between 1992 2000 < 0.1 during...
Repeating earthquakes, or repeaters, are identical in location and geometry but occur at different times. They appear to represent recurring seismic energy release from distinct structures such as slip on a fault patch. Repeaters most commonly found creeping plate boundary faults, where patches loaded by surrounding slow slip, they can be used track creep depth. Their hosting environments also include volcanoes, subducted slabs, mining-induced structures, glaciers, landslides. While true...
The addition of water on or below the earth's surface generates changes in stress that can trigger both stable and unstable sliding landslides faults. While these behaviours are well-described by commonly used mechanical models developed from laboratory testing (e.g., critical-state soil mechanics rate-and-state friction), less is known about field-scale environmental conditions kinematic occur during transition to sliding. Here we use radar interferometry (InSAR) a simple 1D hydrological...
Deep-seated slow slip and tremor (SST), including events, episodic slip, low-frequency earthquakes, occur downdip of the seismogenic zone numerous subduction megathrusts plate boundary strike-slip faults. These events represent a fascinating perplexing mode fault failure that has greatly broadened our view earthquake dynamics. In this contribution, we review constraints on SST deformation processes from both geophysical observations active zones geological exhumed field analogues. We first...
Early warning systems (EWSs) to detect and monitor landslides are a great challenge. They important due the high cost of catastrophic challenging because difficulty in identifying diverse range landslide-triggering factors. While there has been very limited number successes, recent advances Earth observation (EO) from ground, aircraft, space have dramatically improved our ability active landslides. A growing body geotechnical theory suggests that prefailure behavior can offer clues location...
We use geodetic techniques to study the India‐Eurasia collision zone. Six years of GPS data constrain maximum surface contraction rates across Nepal Himalaya 18 ± 2 mm/yr at 12°N ±13° (1σ). These 150‐km‐wide deforming zone are well fitted with a dislocation model buried north dipping detachment fault striking 105°, which aseismically slips rate 20 1 mm/yr, our preferred estimate for India‐to‐southern‐Tibet convergence rate. This is in good agreement various geologic predictions 7 Himalaya. A...
Horizontal velocities of 26 Global Positioning System (GPS) stations in the northwest Himalayan region provide new constraints on partitioning India‐Eurasia convergence and elastic strain accumulation about locked Main Frontal Thrust (MFT). The northwest‐striking Karakorum fault slips at 11 ± 4 mm/yr contributes to east‐west extension southern Tibet westward motion Himalaya towards Nanga Parbat, rather than playing a role eastward extrusion Tibet. Crustal shortening across occurs within zone...
We use Global Positioning System (GPS) observations and elastic half-space models to estimate the distribution of coseismic postseismic slip along Izmit earthquake rupture. Our results indicate that large (reaching 5.7 meters) is confined upper 10 kilometers crust, correlates with structurally distinct fault segments, relatively low near hypocenter. Continued surface deformation during first 75 days after indicates an aseismic as much 0.43 meters on below These are consistent a transition...
Measurements of surface displacements using GPS constrain the motion and deformation India India‐Eurasia plate boundary along Himalaya. The velocities plate‐interior sites pole angular velocity vector with respect to Eurasia lie at 25.6±1.0°N 11.1±9.0°E, approximately 6° west NUVEL‐1A <3 Ma motion. rotation rate 0.44 ±0.03°Myr −1 is 14% slower than long‐term 0.51° Myr . Insignificant between interior indicate that exposed Indian stable within 7 · 10 −9 yr observed contraction across...
Research Article| June 01, 2007 Geodynamics of the southeastern Tibetan Plateau from seismic anisotropy and geodesy S. Sol; Sol 1Earth Environmental Sciences, Lehigh University, 31 Williams Drive, Bethlehem, Pennsylvania 18055, USA Search for other works by this author on: GSW Google Scholar A. Meltzer; Meltzer R. Bürgmann; Bürgmann 2Department Earth Planetary University California, Berkeley, California 94720, R.D. van der Hilst; Hilst 3Department Earth, Atmospheric, Massachusetts...
While deformation at the Earth's surface primarily occurs along tectonic plate boundaries, major earthquakes have shaken regions deep within continental interiors. Three of largest (M > 7.5) historic intraplate occurred Indian subcontinent, suggesting possibility significant deformation. We consider velocities determined from new GPS data collected 29 continuous stations and 41 survey‐mode in India between 1995 2007 to find a north‐south shortening rate 0.3 ± 0.05 nanostrain yr −1 , which...
The crust around the rupture zone of 1992 Landers earthquake has continued to deform in years following at rates ∼3 times greater than pre‐earthquake rates. We use a combination Global Positioning System (GPS) and synthetic aperture radar (InSAR) data collected during ∼3‐year epoch order investigate postseismic mechanisms responsible for high transient velocities. In maximize potential signal from viscoelastic relaxation we evaluate model first few months documented accelerated deformation....
The 26 December 2004 Sumatra earthquake produced static offsets at continuously operating GPS stations distances of up to 4500 kilometers from the epicenter. We used these displacements model and include consideration Earth's shape depth-varying rigidity. results imply that average slip was >5 meters along full length rupture, including approximately 650-kilometer-long Andaman segment. Comparison source derived far-field with seismically estimates suggests 25 35% total moment release...