Close examination of the resistivity record of the Yamazaki resistivity variometer in operation at Aburatsubo brought out a precursor-like change starting a few days prior to the Izu-Hanto-Oki earthquake of magnitude 6.9 on May 9, 1974. This is different from an imminent precursor having a precursor time of 4 hours as already reported for the same earthquake. The precursor, should it be a precursor at all, is of the order of 10-4 in rate of resistivity change and 10-8 in linear strain. Similarity between the resistivity change, change in the maximum amplitude of volcanic tremor on Volcano Mihara, Oshima Island and the tidal G factor observed at the southern Izu Peninsula is discussed.