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| | Abstract | | Ocean bottom hydrothermal deposits have been found in the Japanese Exclusive Economic Zones, mainly in Okinawa and Izu Ogasawara areas, and are attracted attentions for the future mineral resources. The marine TDEM (Time Domain Electro-Magnetic) systems were developed by Waseda University for exploring ocean bottom hydrothermal mineral deposits. The pressure-resistant metal container has profound effects on the measurements of the magnetic fields created by the induced currents in the deposits. The noise due to the currents in the container is very serious to measure the signal from the deposits. In this study, the two techniques to reduce the effects of the container were evaluated with the three-dimensional finite difference numerical modeling. |
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