Geothermal system in the Yuzawa-Ogachi area, northern Honshu.

概要

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Geothermal system in the Yuzawa-Ogachi area is investigated on the basis of the results of geological and geochemical survey including bore hole drilling.The isothermal map at 500 meters below the sea level suggests that the center of geothermal activity is beneath Mt. Yamabushidake and the Uenotai area. The temperature decreases gradually to the northeast and southwest. This fact indicates that the geothermal heat source in this area will be the magma reservoir beneath Late Quaternary volcanoes, namely, Takamatsudake and Oyasudake volcanoes.The geothermal reservoir of this area was previously known at the Uenotai and the Akinomiya areas which were near the boundary of the uplifted and subsided zones of basement rocks.This time, N57-Y0-3 bore hole located in the uplifted zone caught the geothermal reservoir in the basement granitic rocks. Therefore, the geothermal reservoir of this area is probably distributed widely in and surroundings of the uplifted zone.
日本地熱学会の論文