Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published October 1, 1999 | Published
Journal Article Open

Measuring near field coseismic displacements from SAR images: Application to the Landers Earthquake

Abstract

We describe a procedure to compute SAR interferograms based on the compensation of the images' mis‐registrations due to the ground deformation and on a specific adaptive filtering to improve the SNR in the measurement where displacement gradients are large. Applied to the Landers earthquake case, the registration reduces the phase noise by 20° (rms) near the fault and the interferogram reveals fringes that would not show out otherwise. The interferogram is validated by comparison, in the far field, with a GPS/EDM‐based model. The inferred displacement field shows discontinuities that follow the fault within few hundred meters. Close to the fault the measured displacements differ significantly from that predicted by elastic modeling of the far‐field data. Interferometry and measurements derived from the images' amplitude (offsets) appear to be complementary techniques providing original measurements that may help to reconcile seismological and geodetic models of coseismic deformation with measurements of fault‐slip at the surface.

Additional Information

© 1999 by the American Geophysical Union. Received 1 March 1999; accepted 16 June 1999. We are most grateful to E. Rignot and P. Chavel, K.W. Hudnut and G. Peltzer.

Attached Files

Published - MichelGRL1999b.pdf

Files

MichelGRL1999b.pdf
Files (7.8 MB)
Name Size Download all
md5:3b655ab0c358d9b9b4bf7de6453207a6
7.8 MB Preview Download

Additional details

Created:
August 22, 2023
Modified:
October 18, 2023