Mendeley出力
＜紀要論文＞
伊豆鳥島火山の噴気活動
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| 概要 | Torishima is an active volcanic island located on the Izu Arc, 570 km south of Tokyo at Honshu island. The eruptive activity is divided into two stages; the stratovolcano stage, and the central cone s...tage. The eruption during the historic period in Torishima volcano has occurred in 1902, 1939, and 2002. We conducted landing observation ofTorishima in May, 2004. Temperatures of the fumes and ground and compositions (CO_2, S0_2, H_2S) of volcanic gases were measured. The current activity of Torishima volcano is as follows: The highest temperature region showing approximately I00 ℃ is distributed along the narrow band inside the westside rim of Torishima caldera. The fume and ground temperatures at the north side in Io-yama, which is the central major cone of Torishima volcano are nearly constant at l00 ℃ from 1957 to present. CO_2 concentrations in volcanic gases from the fumaroles of the north side in Io-yama is in levels that have almost unchanged from 1965 to the present. A remarkable change of the fumarolic activity resulting from the eruption in 2002 was not detected in this observation.続きを見る |
| 目次 | I. はじめに II. 火山活動史の概略 III. 噴気活動 IV. 測定方法と測定結果 V. 考察 |
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| 登録日 | 2021.10.08 |
| 更新日 | 2022.06.20 |