Deep Sea Bottom Methane Hydrate Investigations Aboard Fisheries Training Ship II -Investigations of methane plume generation using various ultrasonic instruments‐

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  • 漁業練習船による深海底メタンハイドレート探査II―各種超音波計器によるメタンプルーム発生状況の把握－

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<p>In May 2022 and May 2023, the methane hydrate plume generated from the seafloor at a depth of about 560 to 570 meters in the Joetsu Basin was investigated on the training cruise of Nagasaki University's fishery training vessel "Nagasaki-Maru". These observations have mainly been made with “the quantitative echo sounder”, also with “the multi-beam echo sounder”, “the sub-bottom profilers”, “the full-circle scanning sonar” and “the expandable conductivity, temperature and depth profiler”, which equipped at “Nagasaki-maru”. From these, we were able to confirm some plumes at a specific area that continued for over 10 years, and we were also able to estimate the surrounding seafloor shape, the subseafloor structure, which could estimate the presence of methane hydrate solid, and the water structure, which could prove the deflection and melting properties of the plumes.</p>

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