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DENG MING WEI WENBO TAN HANDONG JIN SHENG DONG HAOBIN DENG JINGWU School of Geophysical Prospecting and Information Technology, China University of Geosciences, Beijing 100083, China  
Special prospecting instruments is used when the marine magnetotelluric prospecting is carried out. Both instruments and methods of the magnetotelluric prospecting on land are mature. When these methods are transplanted to the ocean, some engineering techniques about measurement on the seafloor must be solved. They include the picking up of the electric field signal, the monitoring of the environment on the seafloor, the error correction of the instrument in the non-real time monitor status, the pressurization and seal of the measurement unit, etc. In the development of the collector for seafloor magnetotelluric data, advanced technology about material, high precision electrocircuit, the reliable method of developing software and the firm structure of the instruments are use to solve the techniques effectively. The instruments were used to measure the magnetotelluric data firstly in Chinese sea area.
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