1. 1970 年噴火に先立つ活動(IV. 秋田駒ケ岳 1970-71 年の噴火活動の経過)
1971 年 16 巻 2-3 号 p. 107-111
詳細
1971 年 16 巻 2-3 号 p. 107-111
The geothermal survey and the seismic observation were carried out immediately before the outburst of Akita-Komagatake. The only one forerunning phenomenon of the eruptions was the appearance of high ground temperature area with many fumaroles. Neither volcanic-tremor nor B-type earthquake was observed before the beginning of the eruptions.
