Abstract
SUMMARY Daily measurement of apparent resistivity from 1984 May to 1985 October in Shillong Plateau, India, has been carried out for an earthquake-precursor study. The resistivity changes which occur 7 to 10 days before earthquakes do not necessarily satisfy the dilatancy hypothesis, which, of late, has been subjected to criticisms of not being a generalized phenomenological explanation of precursor resistivity variation. Prior to earthquakes, resistivity may increase or decrease or may not even show any change depending on the orientation of measuring electrodes, the elastic nature of the geological formation where observations are made and the direction of tectonic stress.
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