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

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

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3017m&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 19, p. 3017-3020

Mathematics

Logic

12

Geodesy And Gravity: Seismic Deformations, Radio Science: Remote Sensing, Seismology: Earthquake Parameters, Structural Geology: Remote Sensing

Scientific paper

We describe a procedure to compute SAR interferograms based on the compensation of the images' misregistrations 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.

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