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Stack of 65 ERS1-ERS2 (descending) interferograms processing using ROI_PAC (NED DEM and Delft orbits). Bins with less than 34 inteferograms have been eliminated. Each bin divided by cumulative timespan to yield average rate (cm/year). Positive refers to an increase in distance from satellite along line-of-sight (subsidence or horizontal motion away). Detrended with a least-squares fit to SCEC CVM 3.0 - this process results in the area labeled "probably artifact" in north. Some of the shorter wavelength blue features in the south are likely also artifacts, due to unwrapping errors.

While I believe most short-wavelength features are accurate, this is still preliminary. Borrego Springs and Alligretti farms are areas of known growundwater withdrawal. A paper is in preparation; otherwise, best to reference Mellors, R.J., A. van Zandt, and O. Rojas, (2005) The temporal and spatial distribution of deformation in the western Salton trough from 1992-2001 as observed by InSAR, Eos Trans. AGU, 86(52), Fall Meet. Suppl., Abstract G43A-06.

Data is copyright of ESA and acquired from the WINSAR consortium.
This image could not have been created without WINSAR and those who worked on ROI_PAC (thanks!).