| 講演要旨(和文) | | 海底熱水鉱床を対象として、時間領域の電磁探査法の適用を進めている。これまでに開発したROV移動型方式と固定型方式に加えて、2015年度にはROVによる海底曳航型方式を開発した。ROV海底曳航型測定は、移動型測定の測定効率と固定型測定の高いS/Nを合わせ持つ。本方式を使用して、実海域における調査試験を沖縄海域の既知の鉱床で行った。その結果、海底と海底下に広がる熱水鉱床に起因する見掛比抵抗異常を明瞭にとらえ、本方式が実際的な海底での調査に対してより有効であることが証明された。ここでは測定結果の一例を紹介する。 |
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| | 講演要旨(英文) | | We are developing Time Domain EM technologies for the exploration of the ocean bottom hydrothermal mineral deposits. The two measuring systems of moving type and fixed type were introduced in 2012. Currently, in addition to the two systems, the new measuring system of towed type by ROV has been developed. Towing type measurement system promotes highly efficient operation and shows as low noise levels as the fixed type. Test surveys using the towed type were conducted at Okinawa area of known seabed hydrothermal deposits. As the results, apparent resistivity anomalies are clearly shown at the mineral deposits, and the new system is proved to be more practical for the marine mineral deposit surveys than the previous two systems. |
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