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Institute of Geophysics and Planetary Physics
Scripps
Institution of Oceanography
University of California, San Diego
La
Jolla, California 92093-0225
(D.C.A., G.A., H.J.)
Department of Earth Sciences
University of Southern
California
Los Angeles, California 90089-0740
(S.O.)
Department of Earth and Space Sciences
University of
California, Los Angeles
Los Angeles, California
90024-1567
(Z.-K.S.)
U.S. Geological Survey
Menlo Park, California
94025
(J.S.)
Department of Geology
Central Washington
University
Ellensburg, Washington 98926
(K.E.A.)
Earth Resources Laboratory
Massachusetts Institute of
Technology
Cambridge, Massachusetts 02142-1324
(R.R.)
We describe the collection and processing of Global Positioning System (GPS) data from 77 locations around the Hector Mine earthquake, which we use to estimate coseismic displacements related to this shock. The existence of pre-event GPS data, some collected to monitor postseismic displacements from the 1992 Landers earthquake and some to establish survey control in the meizoseismal area, provided a relatively dense coverage close to the rupture zone. The data available were collected mostly within the 2 years prior to the 1999 earthquake; we reobserved many points within a few days after the shock, and all within 6 months after. We include corrections for interseismic motion to provide the best value possible for coseismic motion caused by this earthquake. The displacements in general display the pattern expected for a strike-slip fault, though a few show significant vertical motion. The maximum horizontal displacement observed was 2 m; one station between fault ruptures showed little horizontal motion, but significant uplift.
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