title: Electrical resistivity variations associated with earthquakes on the san andreas fault.
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.
authors.forename: A
authors.initials: A
authors.lastname: Mazzella
authors.forename: H F
authors.initials: HF
authors.lastname: Morrison