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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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.|
|Subject Keywords:||Radio Science: Remote sensing; Seismology: Earthquake parameters; Structural Geology: Remote sensing|
|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.|
|Deposited By:||Tony Diaz|
|Deposited On:||07 Sep 2012 22:53|
|Last Modified:||26 Dec 2012 16:08|
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