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The Hector Mine, California, Earthquake of 16 October 1999: Introduction to the Special Issue

U.S. Geological Survey
345 Middlefield Road, MS 977
Menlo Park, California 94025
(V.E.L., M.J.R.)

Seismological Laboratory
California Institute of Technology
Pasadena, California 91125
(E.H.)

The first 300 words of the full text of this article appear below.

The Hector Mine, California, earthquake (M_w 7.1) struck the Mojave Desert at 09:46 UTC, 16 October 1999. The earthquake occurred approximately 55 km northwest of the town of Twentynine Palms, California, and about 200 km east-northeast of Los Angeles (Fig. 1). The shock was widely felt throughout southern California, southern Nevada, western Arizona, and northernmost Baja California, Mexico. The Hector Mine earthquake, like the M_w 7.3 Landers earthquake seven years earlier, was associated with fault rupture in the eastern California shear zone (ECSZ) (Fig. 1), which is an approximately 80-km-wide zone of deformation that accommodates about 24% of the relative Pacific–North American plate motion (Sauber et al., 1986, 1994; Dokka and Travis, 1990; Savage et al., 1990, 2001; Gan et al., 2000; Miller et al., 2001). A block diagram highlighting some of the basic aspects of the Hector Mine earthquake is presented in Figure 2. A preliminary summary of the Hector Mine earthquake, its effects, and the response of the geoscience community is presented by Scientists from the U.S. Geological Survey; Southern California Earthquake Center, and California Division of Mines and Geology (USGS, SCEC, and CDMG, 2000).

View larger version (163K): [in this window] [in a new window]   Figure 1. Oblique satellite view of northern Baja California, Mexico, westernmost Arizona, and all of southern California. Select cities, geographic features, and generalized traces of major faults drawn for reference. Hector Mine rupture (thick black line) and 1992 Landers rupture shown within eastern California shear zone. View to the northwest. Photograph from National Aeronautics and Space Administration (NASA) Johnson Space Center, Space Shuttle mission STS103, roll 701, frame 39, December 1999.

View larger version (65K): [in this window] [in a new window]   Figure 2. Schematic block diagram with vertical cut along 1999 Hector Mine rupture plane (Simons et al., 2002, this issue) and summarizing . . . [Full Text of this Article]