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California Geological Survey
655 S. Hope St., Suite
700
Los Angeles, California 90017
(J.A.T.)
U.S. Geological Survey
525 South Wilson Ave.
Pasadena,
California 91106
(K.J.K.)
California Geological Survey
801 K St., MS
12-31
Sacramento, California 95814
(W.A.B.)
Department of Geological Sciences
San Diego State
University
San Diego, California 92182
(T.K.R.)
Department of Geological Sciences
California State
University, San Bernardino
5500 University Parkway
San Bernardino,
California 92407-2397
(S.F.M.)
The Mw 7.1 Hector Mine earthquake occurred within the Mojave Desert portion of the eastern California shear zone and was accompanied by 48 km of dextral surface rupture. Complex northward rupture began on two branches of the Lavic Lake fault in the northern Bullion Mountains and also propagated southward onto the Bullion fault. Lesser amounts of rupture occurred across two right steps to the south. Surface rupture was mapped using postearthquake, 1:10,000-scale aerial photography. Field mapping provided additional detail and more than 400 fault-rupture observations; of these, approximately 300 measurements were used to characterize the slip distribution. En echelon surface rupture predominated in areas of thick alluvium, whereas in the bedrock areas, rupture was more continuous and focused within a narrower zone. Measured dextral offsets were relatively symmetrical about the epicentral region, with a maximum displacement of 5.25 ± 0.85 m.* Vertical slip was a secondary component and was variable, with minor west-side-down displacements predominating in the Bullion Mountains. Field and aerial photographic evidence indicates that most of the faults that ruptured in 1999 had had prior late-Quaternary displacement, although only limited sections of the rupture show evidence for prior Holocene displacement.
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