Under-ground water at the foot of the volcano:Mt. Shiribetsu in Hokkaido
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The Rusutsu plateau covered with volcanic ash forms table-lands of 300-400m in elevation, being bounded by Mts. Yotei and Shiribetsu in directions of N. W. and S. E. In this area, no underwater and any river were found and men have never lived.<BR>After the 2nd World War, the government researched the underground wa-ter for a purpose of reclamation. Numbers of wells were excavated to 20-40m in depth through volcanic ash stratum to comply with the result of research. But before long, the wells were dried out due to the underground water-level being lowered below the bottom of wells. The reason was that the wells had not been reached to the impermeable layer.<BR>The writer engaged in the research works in this area since 1961 and concluded the followings.<BR>(1) No underground water exists in volcanic ash but it flows in lava under the ash stratum.<BR>(2) Test borings were made in 1963 after geological investigation. Next year, to follow the result, a deep well was excavated to 100m at the same site, obtaining more than the water of 400m3/day to fall down 10 cm of the waterlevel. This means that in case where the water-level falling down to 50cm, 1, 800m3/day of the water can be resulted.
- 日本陸水学会の論文
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