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| | Abstract | | JAMSA conducted precise topography and self-potential explorations by an AUV, and resistivity method by a Deep-tow, and OBG surveys by a ROV, off the west of Iheyajima, where hydrothermal activities are suggested by plume explorations by a MBES. The precise topographic surveys confirmed several mounds with a diameter of several tens of meters, and clear self-potential anomalies were observed in these areas. However, resistivity exploration showed a small low resistivity near the surface, but not in the underground. In this area, three sampling surveys by a BMS were conducted by J-MARES, but none of the sulfide layers could be confirmed. In addition, the Ocean Bottom Gravity survey revealed a high gravity anomaly area corresponding to the direction of mounds. This may indicate the existence of intrusive rocks that cause hydrothermal activities. |
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