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Co-seismic displacements of the 1992 landers earthquake sequence

U.S. Geological Survey, Pasadena, California 91106
U.S. Geological Survey, Menlo Park, California 94025
Lawrence Livermore National Lab, Livermore, California 94550
Department of Earth and Space Sciences UCLA, Los Angeles, California 90024
I.G.P.P. Scripps Institution of Oceanography, UCSD, La Jolla, California 92093
Department of Geological Sciences Stanford University, Stanford, California 94305

Abstract

We present co-seismic displacement vectors derived from Global Positioning System (GPS) measurements of 92 stations in southern California. These GPS results are combined with five well-determined GPS displacement vectors from continuously tracking stations of the Permanent GPS Geodetic Array, as well as line-length changes from USGS Geodolite and two-color laser trilateration observations, to determine a self-consistent set of geodetic data for the earthquake. These combined displacements are modeled by an elastic dislocation representation of the primary fault rupture planes. On average, the model residuals are about twice the estimated measurement errors.

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