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| | Abstract | | Ocean Bottom Gravity Survey using an ROV was carried out in the Izena Cauldron which is located in the middle Okinawa Trough. A new multi-purpose towing system, which is composed of a hanging sensor platform and a winch system as a lifting device, was useful for secure and efficient observation work. As a result, twenty one gravity data were obtained along a west-east trending survey line of 1,200m length in two days. A preliminary result based on comparison with simple Bouguer anomaly profiles using different crustal densities shows that a bulk density of the north mound where is a high potential area of SMS is around 2.5 g/cm^3. |
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