地球化学的手法による噴火予知

概要

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We have estimated the intensity of volcanic activity for a few volcanoes, and predicted some volcanic eruptions, by using geochemical methods. This paper reports some of our researches about several volcanoes in Japan. We have made researches about Oshima Volcano and Sakurajima Volcano. It was found that the HCl/S0_2 ratio in their volcanic gases increased with increasing the volcanic activity, that is, temperature of gases were high. The similar fact was observed from water soluble chemical compositions of ejecta obtained at the eruption of Usu Volcano in August of 1977. We have made researches also about Kusatsu-Shirane Volcano. It was found that, in the case of phreatic explosion, the more S0_2 gas contaminated into H_2S gas, the stronger the volcanic activity grew. In fact, Kusatsu-Shirane Volcano erupted in March of 1976, and the fact described above was confirmed. This paper also reports several other geochemical phenomena which would be related to volcanic activity.
特定非営利活動法人日本火山学会の論文
1978-04-15