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Home TRE  PSInSAR™ Applications Landslides San Francisco
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San Francisco (California)
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ERS data©ESA 1992-2001 - Layer: 60 cm orthophoto
©U.S. Geological Survey
3D map view of interpolated PSInSAR™ displacements of the study area. The location of the Hayward Fault is highlighted by the distinct change in colour. The underlying image is an orthorectified airphoto with 60 cm resolution (Courtesy of USGS).
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Time series of a critical PS detected in the central landslide.
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PSInSAR™ analysis was performed over the vicinity of Berkeley in the eastern San Francisco Bay area. The active Hayward Fault bounds the western margin of the East Bay Hills which rise to 370 m above sea level. The analysis identified 18.428 PS identifying three patches showing significant ground movement whose locations match those of mapped landslides. Satellite-to-ground distances (range changes) on landslides increase at rates of 5 to 7 millimetres per year, indicating average downslope sliding velocities from 27 to 38 millimetres per year. Time-series analysis shows that displacement occurs mainly during seasons of high-precipitation. During the 1997-1998 El Nino event, rates of range change increased to as much as 11 millimeters per year*.
*Dynamics of Slow-Moving Landslides from Permanent Scatterer Analysis
George E. Hilley, Roland Bürgmann, Alessandro Ferretti, Fabrizio Novali and Fabio Rocca
SCIENCE MAGAZINE, 25 June 2004, Volume 304, Number 5679, Pages 1952-1955 |
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