| Title | Self-Potential Survey in Hachijojima |
|---|---|
| Authors | Takayuki Nishino, Norio Kainuma, Kazuo Matsuyama and Atsushi Muraoka |
| Year | 2000 |
| Conference | World Geothermal Congress |
| Keywords | geothermal, self-potential, hachijojima island, monitoring |
| Abstract | Self-potential survey was carried out around Hachijojima geothermal power station. The regional self-potential distribution indicates that the power plant is located near the northeastern margin of the central part of a NW-SE trending high-potential zone, which presumably originated in an up-current of hydrothermal solutions. The continuous monitoring of self-potential indicates that a potential-fall zone formed some 200 m southeast of the power plant after the beginning of steam production. The change in self-potential probably resulted from a change in reservoir related to the steam production. Periodical surveys on the self-potential will be carried out in the future to study how to extract and analyze self-potential fluctuations caused by a change in reservoirs. |