Resistivity changes as a precursor of earthquake.

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Abstract
Twenty-one resistivity changes as precursors of an earthquake as observed by means of a Yamazaki resistivity variometer are analyzed. On the basis of a Weibull distribution analysis applied to the observed data, it is made clear that a characteristic parameter of the distribution of precursor time takes on an almost the same value as that for a group of short-term precursors, such as land deformation, tilt and strain, and underground water. No correlation between earthquake magnitude and precursor time is alsofound for both the groups. It is surmised that the resistivity precursors, as well as the others cited in the above, may be caused by preliminary failure immediately prior to the main rupture in the earth's crust.

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