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

Michel, Rémi and Avouac, Jean-Philippe and Taboury, Jean (1999) Measuring near field coseismic displacements from SAR images: Application to the Landers Earthquake. Geophysical Research Letters, 26 (19). pp. 3017-3020. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20120907-152149864

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/1999GL900524 DOIUNSPECIFIED
http://www.agu.org/pubs/crossref/1999/1999GL900524.shtmlPublisherUNSPECIFIED
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.
Subject Keywords:Radio Science: Remote sensing; Seismology: Earthquake parameters; Structural Geology: Remote sensing
Record Number:CaltechAUTHORS:20120907-152149864
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120907-152149864
Official Citation:Michel, R., J. Avouac, and J. Taboury (1999), Measuring near field coseismic displacements from SAR images: Application to the Landers Earthquake, Geophys. Res. Lett., 26(19), 3017–3020, doi:10.1029/1999GL900524
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33946
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:07 Sep 2012 22:53
Last Modified:26 Dec 2012 16:08

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