著者

寺田 暁彦 中川 光弘 大島 弘光 青山 裕 神山 裕幸

出版者

東京大学地震研究所

雑誌

東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo (ISSN:00408972)

巻号頁・発行日

vol.79, no.1-2, pp.17-26, 2004

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In this paper, the authors describe remarkable thermo-activities especially at the fumaroles B on the southwestern cliff of the summit dome on Tarumae volcano, which unusually occurred soon after the Tokachi-oki erathquake that took place on Sep. 26 2003 (MJMA 8.0). The unusual thermoactivities include (1) increase in gas flux, (2) weak glow witnessed by the high-sensitive camera in the nighttime with positions moving night by night, and (3) ash ejection of about 24m^3. Since the high-sensitive cameras can detect thermal radiation, the observed glow would be evidence for high-temperature of rock surface. It is considered that the Tokachi-oki earthquake would affect the volcano to eject a large amount of high-temperature gas, which resulted in the weak but unusual glow and ash deposits of the order of 10m^3 in volume.