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| | Abstract | | Seabed resources like seafloor hydrothermal deposits have recently again attracted much attention. It is, however, difficult to estimate accurate abundance of those resources. From such a standpoint, we have been developing new electrical and magnetic exploration systems by using AUV, ROV, and a deep-tow system in order to estimate detailed structures of the seafloor since 2008. We have made each device of magnetic and electrical exploration systems on an experimental basis, and have tested and improved that. In 2010, the magnetic exploration system was tested practically in the Bayonnaise Knoll area both using a titanium towing frame during the R/V Bosei-maru cruise and using AUV "Urashima" during the R/V Yokosuka cruise. From these tests, we have succeeded in measuring three components and total intensity of the geomagnetic field, and have obtained detailed magnetic anomaly in the Hakurei deposit area. In the future, we will improve the accuracy of the measurement, add a positioning and data-communication system for the deep-tow system, develop an analysis method of 3D magnetic structures, etc., to construct the practical magnetic exploration system. We will also need to increase data density in order to obtain the precise structures. Note that this study has been supported by MEXT. |
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