Seafloor survey of Nishinoshima Island using an Autonomous Underwater Vehicle

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  • 自律型海中ロボットシステムによる西之島海底調査

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Description

Nishinoshima Island is an uninhabited volcanic island in the Ogasawara Islands of Tokyo. While it is clear that the terrestrial part of the island was covered with lava and volcanic ash due to a large-scale eruption in 2020, the underwater part had not been surveyed yet, and it was unclear how far the lava and volcanic ash have spread and what the situation is for fish and benthic organisms. In July 2021, underwater and seafloor observations were carried out using a low-cost autonomous underwater vehicle system. Despite the strong currents, we succeeded in taking detailed optical images of the seafloor, including the steep topography. Volcanic ash was deposited on the seafloor in the northern part of Nishinoshima Island, and flat topography was observed. In the northeastern part of the seafloor, the fume emission was observed. In addition, several kinds of nektons, from large fish such as sharks to small fish and an octopus, were captured on HATTORI’s camera.

Journal

  • Ogasawara research

    Ogasawara research 49 97-112, 2023-03

    東京都立大学小笠原研究委員会

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