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| | Abstract | | Marine magnetotelluric(MT) soundings around the Enshu Basin, off the Tokai region, Japan, were carried out to clarify the crustal and mantle structures. Ocean bottom electro-magneto meter (OBEM) and Ocean bottom electro meter (OBE) were used in this survey to measure two marine electromagnetic field data sets over the subducting Philippine Sea plate, from January to February and from April to July in 2007. Both time series data of horizontal electric and magnetic fields were obtained at five sites, and only horizontal electric field data were obtained four sites. Apparent resistivity and impedance phase at some of each site were calculated from these observed data with selecting the time series data which were removed spike noises and a resistivity inclination below the seafloor at the region was estimated. It is meaning for marine MT surveys to interpret the estimated resistivity model with considering the relation of the characteristic in generation mechanism of earthquake. |
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