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CIMDAS

SANTA CLARA VALLEY, CALIFORNIA

InSAR imagery reveals seasonal and long-term land-surface-elevation changes influenced by ground-water levels and fault alignment in the Santa Clara Valley.

SEASONAL RECOVERABLE SUBSIDENCE

  

Interferogram showing seasonal recoverable subsidence 1997
Between January and August 1997 seasonal, recoverable subsidence occurred due to seasonal ground-water level declines. Subsidence patterns during this period are similar to historical subsidence patterns (1934-1967).
Profiles of ground displacements.  

Profiles of ground displacements sampled from cross sections A-A' and B-B' on the seasonal interferogram reveal steep displacement gradients near the trace of an inferred northwesterly extension of the buried Silver Creek Fault zone. Recent geophysical surveys (seismic reflection/refraction), undertaken as a result of the interferogram, confirm the presence of buried faults at this boundary (R. Catchings, USGS, written communication, 2000).

Modified from Galloway, et.al., Measuring Land Subsidence from Space, Fact Sheet-051-00 April 2000		  

Links to other Santa Clara Valley interferograms.

3-D representation of the seasonal recoverable subsidence interferogram (Jan-Aug 1997)

Link to relief map of seasonal recoverable subsidence 1997

Long -term land surface elevation changes.

Link to long-term land surface elevation changes.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Galloway, D.L., Jones, D.R., Ingebritsen, S.E., Measuring Land Subsidence from Space, Fact Sheet-051-00 April 2000