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| | Abstract | | We have been developing a magnetic exploration system by using AUV and deep-tow system. The purpose is to construct a magnetic exploration system that is useful to estimate accurate abundance of seabed resources like hydrothermal deposit. In 2010, that system was tested in the Bayonnaise Knoll caldera both using a titanium towing frame during the R/V Bosei-maru cruise and using AUV Urashima during the R/V Yokosuka cruise. A large hydrothermal deposit, Hakurei deposit, lies in the southeast part of the caldera. In the former, we observed vector magnetic anomalies at depths of 400-570 m along tracks across the caldera. In the latter, we observed vector and intensity magnetic anomalies at altitudes of 60-100 m around the Hakurei deposit and at depth of 500 m above the caldera. A 3D gridded data of the vector magnetic anomaly was made by solving the Laplace's equation in the areas where observation data were not available, which is the unique procedure for analysis of the vector anomalies. Several magnetization solutions have been so far obtained by successive approximation and inversion methods. We will here present the analysis of magnetization structure in the survey area. Note that this study has been supported by MEXT. |
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