Reports

Electrical Resistivity Variations Associated with Earthquakes on the San Andreas Fault

Science  06 Sep 1974:
Vol. 185, Issue 4154, pp. 855-857
DOI: 10.1126/science.185.4154.855

Abstract

A 24 percent precursory change in apparent electrical resistivity was observed before a magnitude 3.9 earthquake of strike-slip nature on the San Andreas fault in central California. The experimental configuration and numerical calculations suggest that the change is associated with a volume at depth rather than some near-surface phenomenon. The character and duration of the precursor period agree well with those of other earthquake studies and support a dilatant earthquake mechanism model.

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