Loma Prieta, California, Earthquake October 17, 1989. Crack system near Summit Road, half a mile southeast of Highway 17.
Dates
Date Taken
1989
Summary
Loma Prieta, California, Earthquake October 17, 1989. Crack system near Summit Road, half a mile southeast of Highway 17. As it crosses Summit Road, the crack trends nearly north, rather than northwest, and displays a large component of left-lateral displacement. In general, the upthrown block is on the downhill side of this crack. The swale along the crack on the northeast side of Summit Road ridge in this area suggests similar displacement may have occurred in the past. Figure 10-C, U.S. Geological Survey Circular 1045.
Summary
Loma Prieta, California, Earthquake October 17, 1989. Crack system near Summit Road, half a mile southeast of Highway 17. As it crosses Summit Road, the crack trends nearly north, rather than northwest, and displays a large component of left-lateral displacement. In general, the upthrown block is on the downhill side of this crack. The swale along the crack on the northeast side of Summit Road ridge in this area suggests similar displacement may have occurred in the past. Figure 10-C, U.S. Geological Survey Circular 1045.
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