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| | Abstract | | A MT survey was conducted in the Akanko hot springs to clarify a geothermal structure. MT measurements were carried out at 14 survey sites on two lines installed at the lake side and mountain side. 2D resistivity structure revealed conductive dike-like structures at the west site in both lines. A NS direction lineament detected by connecting two sites in each line and many geothermal manifestations are seen along the lineament. This suggests that the conductive structure is interpreted as a fracture zone channeling up flow of geothermal water. Low resistivity layers, 200 to 800m thick, spread over beneath the hot spring area and is interpreted as the reservoir of hot spring. These resistivity structures imply that geothermal water is supplied from the fracture zone in the west area and it flows to the east in the reservoir that formed by mixing it with the meteoric water. The new geothermal model was proposed based on this survey data. |
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