Abstract
In this paper we describe the results of self potential survey conducted over Onikobe geothermal area in Narugo-cho, Miyagi prefecture, and discuss the relationship of the measured self potential anomaly to the calculated potential profile and the geologic structure. We introduce two types of models to interpret the measured self potential variation. In this analysis, it is assumed that the sources of self-potential generation are roughly coincident in location and depth with known faults. The potential fields generated by the models are compared with the actual profiles . A new model consisting of dipolar current distribution (Corwin et al., 1981) is generally valid for the interpretation of the field data obtained by both B and D3 survey lines. The agreement appears to be reasonably well. This implies that the self potential anomalies seen in Onikobe geothermal area may be related to the faults.
