Application of Marine Controlled-source Electromagnetic Sounding to Submarine Massive Sulphides Explorations Available to Purchase

In conventional marine CSEM methods, we need a survey vessel that tows a long cable to which both an EM transmitter and receivers are attached. Therefore, it is difficult to survey shallow sub-seafloor structure below the seafloor of complex topography around submarine massive sulphides (SMS) because of the risk of cable-tangling. In this research, we propose a new marine CSEM method to solve this problem using two autonomous underwater vehicles (AUV). Using this method, it is possible to keep a low height of diving AUVs from the seafloor, so we can carry out the exploration of SMS effectively. We discussed the possibility of new CSEM method employing the 2.5-D FEM program. From numerical results, it is possible to detect the rough existent area of SMS and the rough thickness of SMS.