学会誌「自然災害科学」
自然災害科学55 Vol.19,No.3, 2000
【速報】[Preliminary Report]
有珠山2000年噴火の様式と活動の変化
Geochemical and Geothermal Study Associated with the Usu 2000 Eruption, and Changes of It's Activity
平林 順一*・安孫子 勤**・野上 健治*・鍵山 恒臣***・大場 武*・前川 徳光****・鈴木 敦生****・鈴木 隆*
Jun-ichi HIRABAYASHI*, Tsutomu ABIKO**, Kenji NOGAMI*, Tsuneomi, KAGIYAMA***, Takeshi OHBA*, Tokumitsu MAEKAWA****, Atsuo SUZUKI****, and Takashi SUZUKI*
Abstract
Seismic activity and ground deformation at the summit area of Usu volcano
started about one week before the Usu 2000 Eruption. The eruption took
place at Nishiyama crater on 31 March after 23 years dormancy. After the
eruption, phreatomagmatic or phreatic eruption are continued at the Nishiyama
and Konpira craters. The eruptive activity is decreased gradually.
Geochemical and geothermal observations carried out to understand the
mechanism and change of eruptive activity from just after the eruption.
The observation results indicate the subsurface water is closely connected
with the eruptive activity and its change. The water is one of the primary
factors of rapid decline of the eruptive activity.
キーワード:
有珠火山，噴火，火山ガス，地下水，放熱量
Key words:
Usu Volcano, eruption, volcanic gas, subsurface water, heat discharge
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東京工業大学火山流体研究センターVolcanic Fluid Research Center, Tokyo Institute of Technology
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室蘭工業大学応用化学科Department of Applied Chemistry, Muroran Institute of Technology
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東京大学地震研究所Earthquake Research Institute, University of Tokyo
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北海道大学地震火山研究観測センターSeismological and Volcanological Institute, Hokkaido University