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| | Abstract | | The subsurface resistivity structure in the vicinity of subduction zone is key information that characterizes not only the generation mechanism of earthquakes but also the distribution of natural resources such as gas hydrate. This is because resistivity is sensitive to the existence of water. Marine magnetotelluric survey is now applicable to estimate the crustal resistivity structure near costlines due to the development of the obsearvation equipment. On the other hand, the MT data come to be afected by the three ensionality of seafoor structures. In this study, we confirmed how three-dimensional topography distorts MT responses of TM-mode and TE-mode, and determined TE-mode is suitable to be interpreted using two-dimensional analysis. Thenn we estimated the crustal resistivity structure in Eastern Nankai by TE-mode analysis, and con rmed the resistivity changes along the subduction boundary. |
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