Study of the Underground River Covered by Mishima Lava Flow, Mt., Fuji

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  • 三島熔岩流中の地下川について
  • ミシマ ヨウガンリュウ チュウ ノ チカガワ ニ ツイテ

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Abstract

In the vicinity of the city of Mishima, Shizuoka Prefecture, Japan, there is along lava flow (Mishima lava flow) which issued from the southeastern side of Fuji Volcano., From this lava flow, clear water amounting to 330, 000 gallons per minute gushes out forming numerous springs., Since 1948, the writer has examined the underground river supposed to lie upslope from these springs, for the purpose of investigating water sources for the irrigation of rice fields., This underground river is called the Ko-Mishimagawa (Old River of Mishima) by the writer., It flows principally in a tuffaceous formation of Hakone Volcano situated to the northeast and eventually fills up two cavernous zones in the Mishima lava flow where the latter meets the tuffaceous formation of Hakone., At 300 localities, the thickness of the lave flow and the topography of the river-bed were determined by the Wenner method of electric prospecting, based on the fact that the resistivity of the lave is high, while that of the tuff is low., The location of the river-bed and the presence of underground water in the lave flow thus supposed were secured by three boreholes.,

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