A5058617908- Planetary Science and Exploration
- Aeolian processes and effects
- earthquake and tectonic studies
- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Astro and Planetary Science
- Earthquake Detection and Analysis
- Geological and Geochemical Analysis
- Space Exploration and Technology
- Satellite Image Processing and Photogrammetry
- Seismic Waves and Analysis
- Winter Sports Injuries and Performance
- Seismology and Earthquake Studies
- Remote Sensing and LiDAR Applications
- Seismic Imaging and Inversion Techniques
- Geochemistry and Geologic Mapping
- Landslides and related hazards
- Biocrusts and Microbial Ecology
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Arctic and Antarctic ice dynamics
- Coastal and Marine Dynamics
- 3D Surveying and Cultural Heritage
- High-pressure geophysics and materials
- Scientific Research and Discoveries
- Robotics and Sensor-Based Localization
Jet Propulsion Laboratory
2015-2024
Moroccan Foundation for Advanced Science, Innovation and Research
2024
California Institute of Technology
2008-2018
Planetary Science Institute
2014
NASA Planetary Science
2006
Abstract Coseismic surface deformation in large earthquakes is typically measured using field mapping and with a range of geodetic methods (e.g., InSAR, lidar differencing, GPS). Current methods, however, either fail to capture patterns near‐field coseismic or lack preevent data. Consequently, the characteristics off‐fault parameters that control it remain poorly understood. We develop standardized method fully measure surface, near‐field, at high resolution COSI‐Corr program by correlating...
Recent methodological progress, Co-Registration of Optically Sensed Images and Correlation, outlined here, makes it possible to measure horizontal ground deformation from optical images on an operational basis, using the COSI-Corr software package.In particular, its sub-pixel capabilities allow for accurate mapping surface ruptures measurement co-seismic offsets.We retrieved fault rupture 2005 Mw 7.6 Kashmir earthquake ASTER images, we also present a dense 1992 7.3 Landers California,...
The increasing availability of high‐quality optical satellite images should allow, in principle, continuous monitoring Earth's surface changes due to geologic processes, climate change, or anthropic activity. For instance, sequential have been used measure displacements at coseismic ground deformation [e.g., Van Puymbroeck et al. , 2000], ice flow [ Scambos 1992; Berthier 2005], sand dune migration Crippen 1992], and landslides Kääb 2002; Delacourt 2004]. Surface related agriculture,...
Geodetic slip inversions for three major (Mw > 7) strike-slip earthquakes (1992 Landers, 1999 Hector Mine and 2010 El Mayor–Cucapah) show a 15–60 per cent reduction in near the surface (depth < 2 km) relative to at deeper depths (4–6 km). This significant difference between coseismic depth has been termed shallow deficit (SSD). The large magnitude of this an enigma since it cannot be explained by creep during interseismic period or triggered from nearby earthquakes. One potential explanation...
Abstract The first in situ investigation of an active dune field on another planetary surface occurred 2015–2016 when the Mars Science Laboratory Curiosity rover investigated Bagnold Dunes Mars. High Resolution Imaging Experiment images show clear seasonal variations that are good agreement with atmospheric model predictions intra‐annual sand flux and migration directions together indicate campaign during a period low wind activity. limited changes nevertheless occurred, movement large...
Brief Report| March 25, 2014 The 2013 Mw 7.7 Balochistan Earthquake: Seismic Potential of an Accretionary Wedge R. Jolivet; Jolivet aSeismological Laboratory, Department Geological and Planetary Sciences, California Institute Technology, 1200 E Blvd, Pasadena, 91125 Search for other works by this author on: GSW Google Scholar Z. Duputel; Duputel *Now at Institut de Physique du Globe Strasbourg, UdS EOST/CNRS UMR 7516, France. B. Riel; Riel M. Simons; Simons L. Rivera; Rivera cInstitut France...
Abstract During its ascent up Mount Sharp, the Mars Science Laboratory Curiosity rover traversed Bagnold Dune Field. We model sand modal mineralogy and grain size at four locations near traverse, using orbital shortwave infrared single‐scattering albedo spectra a Markov chain Monte Carlo implementation of Hapke's radiative transfer theory to fully constrain uncertainties permitted solutions. These predictions, evaluated against in situ measurements one site from rover, show that X‐ray...
We measure the displacement field resulting from 1975–1984 Krafla rifting crisis, NE Iceland, using optical image correlation. Images are processed COSI‐Corr software package. Surface extension is accommodated on normal faults and fissures which bound rift zone, in response to dike injection at depth. Correlation of declassified KH‐9 spy SPOT5 satellite images reveals between 1977–2002 (2.5 m average opening over 80 km), while correlation aerial photos 1957–1990 provide measurements total...
Abstract Subpixel correlation of preevent and postevent air photos reveal the complete near‐field, horizontal surface deformation patterns 1992 M w 7.3 Landers 1999 7.1 Hector Mine ruptures. Total displacement values for both earthquakes are systematically larger than “on‐fault” displacements from geologic field surveys, indicating significant distributed, inelastic occurred along these Comparison two data sets shows that 46 ± 10% 39 22% total were distributed over fault zones averaging 154...
Abstract Fault slip distributions provide important insight into the earthquake process. We analyze high-resolution along-strike co-seismic profiles of 1992 M w = 7.3 Landers and 1999 7.1 Hector Mine earthquakes, finding a spatial correlation between fluctuations distribution geometrical fault structure. Using spectral analysis, we demonstrate that observed variation is neither random nor artificial, but self-affine fractal rougher for Landers. show wavelength amplitude variability...
Abstract. Accurate measurements of ice flow are essential to predict future changes in glaciers and caps. Glacier displacement can principle be measured on the large scale by cross-correlation satellite images. At weekly monthly scales, expected is often same order as noise for commonly used images, complicating retrieval accurate glacier velocity. Assessments velocity short timescales over complex areas such mountain ranges therefore still lacking but better understand how dynamics driven...
Applications such as change detection and digital elevation model extraction from optical images require a rigorous modeling of the acquisition geometry. We show that unrecorded satellite jitter during image acquisition, uncertainties on CCD arrays geometry are current major limiting factors for applications requiring high accuracy. These artifacts identified quantified several satellites, i.e., SPOT, ASTER, QuickBird, HiRISE.
Correlation of KH9 spy and SPOT5 satellite images, airphotos, digital elevation model differencing, electronic distance measurement, leveling survey data is used to constrain the deformation resulting from 1975–1984 Krafla rifting crisis. We find that diking typically extends depths 5 km, while dike tops range 0 km in caldera region 3 at northern end rift. Extension accommodated by depth normal faulting shallowest crust. In southern section rift, surface opening 80% depth. Over 70–80 length...
Abstract Shallow coastal regions are among the fastest evolving landscapes but notoriously difficult to measure with high spatiotemporal resolution. Using Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR) data, we demonstrate that signal‐to‐noise L band synthetic aperture radar (SAR) can reveal subaqueous channel networks at distal ends of river deltas. 27 UAVSAR images collected between 2009 and 2015 from Wax Lake Delta in Louisiana, USA, show under normal tidal conditions,...
Abstract We used aerial photos taken before and after the 21 September 1999, M w 7.6, Chi‐Chi earthquake in central Taiwan to measure near‐field ground deformation. A total of 12 pairs images were processed with Co‐registration Optically Sensed Images Correlation produce a horizontal displacement map 10 km × area near Tsaotun. Using different viewing angles, both vertical slip across fault zone can be measured. Our measurements when resampled into lower resolution are consistent...