伊豆大島三原山における火口ガスの連続化学観測

概要

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Two gas monitoring systems were set after the 1986 eruption at the summit area of Mt. Mihara, Izu-Oshima,. One system has been developed to observe the H_2, CO_2 and O_2 concentrations in the fumarolic gas and in the atmosphere. The other system monitors the H_2 concentration in the atmosphere in the crater area in order to evaluate the degassing activity of magma. Mt. Mihara explosively erupted on 16 November, 1987 after an interval of about one year since the last eruption. Both gas monitoring systems detected the increase in the H_2 releasing activity from the crater area about one month preceding to the explosion. Geochemical monitoring would be useful for detecting the volcanic activity and the prediction of eruption.
特定非営利活動法人日本火山学会の論文
1988-04-01