Estimation of an eartquake focal mechanism from a satellite radar interferogram:Application to the December 4, 1992 Landers aftershock

Details Estimation of an eartquake focal mechanism from a satellite radar interferogram:Application to the December 4, 1992 Landers aftershock Estimation of an eartquake focal mechanism from a satellite radar interferogram:Application to the December 4, 1992 Landers aftershock

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22.1037f&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 9, p. 1037-1040

Mathematics

Logic

29

California, Dislocations (Materials), Earthquakes, Elastic Deformation, Interferometry, Iterative Solution, Radar Geology, Satellite-Borne Radar, Seismology, Displacement Measurement, Environmental Research Satellites, Least Squares Method, Monte Carlo Method, Shock Waves, Synthetic Aperture Radar

Scientific paper

Interferometric fringes generated by the phase difference between a pair of synthetic-aperture radar images acquired by the ERS-1 satellite were used to estimate the focal mechanism of a small, shallow thrust earthquake. The inversion procedure is an iterative, linerarized least-squares algorithm based on a standard elastic dislocation formulation for coseismic displacements. The preferred estimate is a thrust focal mechanism with its hypocenter at (N34.35 deg +/- 0.4 km, W 116.91 deg +/- 0.2 km, 2.6 +/- 0.3 km depth) on a plane dipping southward beneath the San Bernardino Mountains, with a moment magnitude of 5.4. The strike, dip and rake are N106 deg E +/- 7 deg, 28 deg +/- 4 deg, and 93 deg +/- 4deg, respectively on a fault 3.1 +/- 0.5 km wide and 2.9 +/- 0.4 km long. The precision of these estimates is competitive with seismological determinations.

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