抄録
Hachijojima is a gourd shaped volcanic island in the Pacific Ocean, comprisingNishiyama volcano and Higashiyama volcano. From the results of geothermal exploration since 1984, a promising geothermal resource was found on the island. Three exploration wells were drilled in northern part of Nakanogo in 1997, andconfirmed high temperature and high pressure vapor dominated geothermal resources which was sealed by cap rock of hydrothermal alteration. At present, a 3.3 MW geothermal power plant is under construction. Commercial operation will be started at the end of March 1999.
