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Science 6 September 1974:
Vol. 185. no. 4154, pp. 855 - 857
DOI: 10.1126/science.185.4154.855
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Articles

Electrical Resistivity Variations Associated with Earthquakes on the San Andreas Fault

Aldo Mazzella 1 and H. Frank Morrison 1

1 Engineering Geoscience, University of California, Berkeley 94720

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.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Earthquake precursors.
T. RIKITAKE (1975)
Bulletin of the Seismological Society of America 65, 1133-1162
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Science. ISSN 0036-8075 (print), 1095-9203 (online)