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Science 25 May 1984:
Vol. 224. no. 4651, pp. 869 - 872
DOI: 10.1126/science.224.4651.869
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Articles

Seismic Potential Revealed by Surface Folding: 1983 Coalinga, California, Earthquake

ROSS S. STEIN 1 and GEOFFREY C. P. KING 2

1 U.S. Geological Survey, Menlo Park, California 94025
2 Bullard Laboratories, Department of Earth Science, Cambridge University, Cambridge, England CB3 OEZ

The 2 May 1983 Coalinga, California, earthquake (magnitude 6.5) failed to rupture through surface deposits and, instead, elastically folded the top few kilometers of the crust. The subsurface rate of fault slip and the earthquake repeat time are estimated from seismic, geodetic, and geologic data. Three larger earthquakes (up to magnitude 7.5) during the past 20 years are also shown to have struck on reverse faults concealed beneath active folds.

Submitted on January 13, 1984
Accepted on February 23, 1984


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