1983 年の三宅島噴火に伴う温泉の化学組成の変化

概要

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Eruptions occurred on Miyake Island on the 3rd of October, 1983. An enormous amount of hot lava flowed from the middle slope of Mt. Oyama and also eruptions occurred at Shinmyo Pond and on the coast of the Pacific Ocean. During October 13 to 15, the authors collected water samples from hot and cold springs and lakes on Miyake Island. The analytical results are as follows : Tairo Pond showed 23.9℃ W. temp., 7.1 pH, 485 mg/l evaporated residues, 159 mg/l Cl and 76 mg/l SO_4 ; Shinmyo Pond showed 33.5℃ W. temp., 3.7 pH, 3377 mg/l evaporated residues, 1575 mg/l Cl and 531 mg/l SO_4 ; the new crater lake created by the eruptions showed 64.0℃ W. temp., 7.2 pH, 35965 mg/l evaporated residues, 19000 mg/l Cl and 2771 mg/l SO_4 ; a new pond created on the coast of the Pacific Ocean showed 56.0℃ W. temp., 7.2 pH, 38350 mg/l evaporated residues, 19750 mg/l Cl and 2583 mg/l SO_4. Shinmyo Pond was buried by the eruption which occurred at the edge of the pond on October 3, 1983. Therefore, the water in the pond was acid showing 3.7 pH and 1575 mg/l Cl, while before the eruption, it was alkaline.
特定非営利活動法人日本火山学会の論文
1984-12-28