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Seasonal subsidence and rebound in Las Vegas Valley, Nevada, observed by synthetic aperture radar interferometry
 

Summary: Seasonal subsidence and rebound in Las Vegas Valley, Nevada,
observed by synthetic aperture radar interferometry
Jo¨rn Hoffmann and Howard A. Zebker
Department of Geophysics, Stanford University, Stanford, California
Devin L. Galloway
U.S. Geological Survey, Sacramento, California
Falk Amelung
Hawaii Institute of Geophysics and Planetology, University of Hawaii, Honolulu, Hawaii
Abstract. Analyses of areal variations in the subsidence and rebound occurring over
stressed aquifer systems, in conjunction with measurements of the hydraulic head
fluctuations causing these displacements, can yield valuable information about the
compressibility and storage properties of the aquifer system. Historically, stress-strain
relationships have been derived from paired extensometer/piezometer installations, which
provide only point source data. Because of the general unavailability of spatially detailed
deformation data, areal stress-strain relations and their variability are not commonly
considered in constraining conceptual and numerical models of aquifer systems.
Interferometric synthetic aperture radar (InSAR) techniques can map ground
displacements at a spatial scale of tens of meters over 100 km wide swaths. InSAR has
been used previously to characterize larger magnitude, generally permanent aquifer system
compaction and land subsidence at yearly and longer timescales, caused by sustained

  

Source: Amelung, Falk - Rosenstiel School of Marine and Atmospheric Sciences, University of Miami

 

Collections: Geosciences