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by M.J. Huang, R.W. Sherburne, D.L. Parke and A.F. Shakal
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Introduction
Strong motion records were recovered at over thirty stations of the
California Strong Motion Instrumentation Program (CSMIP) following the
earthquake of 8 July 1986 which occurred approximately 18 km north of Palm
Springs. In total, records were recovered from 21 free-field stations, 8
buildings, 2 earth dams and one power plant. In addition to these records
recovered by CSMIP, records were also recovered by such agencies as the U.S.
Geological Survey and the University of Southern California.
Current estimates of the earthquake location and magnitude are
(K. Hutton, CIT, personal communication):
Hypocenter: 33.998 N, 116.607 W, 12 km depth. Magnitude: 5.9 ML
Origin Time: 09:20: 45 GMT (02:20:45 PDT), 8 July 1986.
Surface faulting was observed in the epicentral area (E. Hart, personal
communication). A total of about 7 cm of predominantly right-lateral
strike-slip displacement was observed on the Banning Fault, a branch fault
of the San Andreas Fault. The displacement observed was distributed over
several parallel fault strands crossing Highway 62. Minor rupture was also
observed on the Mission Creek Fault and along a branch fault at the mouth of
Whitewater Canyon.
Serious damage was reported at an electric power substation near Devers
Hill, and at the Whitewater Interstate 10 overpass west of North Palm
Springs.
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