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| | Abstract | | A "Chinoike" pond has repeatedly appeared and disappeared in Mt. Akagi area. To better understand the geological structure of the "Chinoike" pond, gravity, electrical, and borehole surveys were conducted. The lake and groundwater were also monitored to understand the period of appearance of "Chinoike" and the following results were obtained. (1) A drastic reduction that was observed in the water level of the pond was caused by groundwater drainage. (2) The geological structure of the "Chinoike" pond generally followed the topographic structure of the mountain, and the sedimentary layer below the pond consists of the surface layer of the organic soil, the sand layer (1 - 3.7 m depth) and the deeper clay layer. (3) The distribution of the clay layer was the lowest in the south |
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