The new EM tomography system was planned for the detailed survey of mineral exploration. EM tomography system consists of surface; transmitter (3-component loop sources) and borehole; receiver (vertical component), and uses frequencies in the 8 - 8,192 Hz range. As the first step of the system development, we conducted model studies using SLDM (3D) developed by Druskin (1994). The phase data of EM tomography is very sensitive to the anomaly and 3-component sources are useful especially for multi-dimensions structure case. Also, these simulation results were used for the system design such as necessary sensitivity of receiver, transmitting moment and so on.


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