海水中のメタンを指標に用いた三宅島周辺海底における火山活動調査の結果について 土岐 知弘 角皆 潤 蒲生 俊敬 皆川 昌幸 特定非営利活動法人日本火山学会 火山 04534360 48 1 63 67 2003-03-18 In June 2000, several eruptions occurred on Miyake-jima Island, accompanied by volcanic and/or hydrothermal activity offshore from the island. In January 2001, water samples were collected from five stations around the island in order to reveal the existence of volcanic activity on the seafloor in the area. Concentrations and stable carbon isotopic compositions of dissolved methane in the water samples, however, showed no sign of submarine volcanic activity over the area. These results indicate that the submarine volcanic activity in the area was not in steady state at least during the sampling program. 2003-03-18 110003041305 AN10512786 6538823 JPN CJP NDL NII-ELS 3 14 Geochemical Exploration of Volcanic Activity on the Sea Floor Using CH_4 as a Tracer : Miyakejima Volcano, Izu-Bonin Arc, Japan TOKI Tomohiro TSUNOGAI Urumu GAMO Toshitaka MINAKAWA Masayuki Volcanological Society of Japan Bulletin of the Volcanological Society of Japan In June 2000, several eruptions occurred on Miyake-jima Island, accompanied by volcanic and/or hydrothermal activity offshore from the island. In January 2001, water samples were collected from five stations around the island in order to reveal the existence of volcanic activity on the seafloor in the area. Concentrations and stable carbon isotopic compositions of dissolved methane in the water samples, however, showed no sign of submarine volcanic activity over the area. These results indicate that the submarine volcanic activity in the area was not in steady state at least during the sampling program. 土岐 知弘 TOKI Tomohiro 北海道大学大学院理学研究科地球惑星科学専攻 Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University 角皆 潤 TSUNOGAI Urumu 北海道大学大学院理学研究科地球惑星科学専攻 Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University 蒲生 俊敬 GAMO Toshitaka 北海道大学大学院理学研究科地球惑星科学専攻 Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University 皆川 昌幸 MINAKAWA Masayuki 中央水産研究所海洋生産部海洋放射能研究室 Radioecology Section, Marine Productivity Division, National Research Institute of Fisheries Science