Geochemical Exploration of Volcanic Activity on the Sea Floor Using CH<sub>4</sub> as a Tracer : Miyakejima Volcano, Izu-Bonin Arc, Japan

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  • TOKI Tomohiro
    Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University
  • TSUNOGAI Urumu
    Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University
  • GAMO Toshitaka
    Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University
  • MINAKAWA Masayuki
    Radioecology Section, Marine Productivity Division, National Research Institute of Fisheries Science

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  • 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
  • カイスイチュウ ノ メタン オ シヒョウ ニ モチイタ ミヤケジマ シュウヘン カイテイ ニ オケル カザン カツドウ チョウサ ノ ケッカ ニ ツイテ

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Abstract

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.

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