九重火山1995-96年噴火活動に伴う火山灰中の発泡ガラス含有量の経時変化

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The October eruption in 1995 occurred at the eastern frank or Mt. Hosshozan in Kuju volcano after 250-years dornancy, In this paper, the variation in content of vesiculated glass shards in ejected ash during October '95 to Februry '96 has been examined to reconstruct the condition of conduit and to predict the ascent of the latent magma. In order to concentrate the vesiculated glass shards, heavy liquid (SPT; Sodium Polytungstate) separation has been used on several samples. As the result, the significant increment of the content of vesiculated glass shards was detected from the ash around December 20, 1995, and the series of magmatic activity is assumed that a new stage began at that time. Such a magmatic activity continued till the early in February. But after that time, there have been no significant events of magmatic activity.
特定非営利活動法人日本火山学会の論文
1997-11-25