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| | Abstract | | Subsurface resistivity structure in the vicinity of subduction zone is useful information that characterizes not only earthquakes generation mechanism but also the distribution of natural resources such as gas hydrate. Since the generation of both earthquake and natural resources could all be related to the migration of interstitial fluid, it is justified to use an electromagnetic method that is sensitive to the existence of water. In the course of our analysis for marine MT data acquired at Eastern Nankai, we confirmed that the three dimensional geographical features influence the MT responses according to the value of skewness. It is said that there are the three dimensional geographical effects when the skewness value becomes beyond 0.3, while the value in Eastern Nankai was between 0.3 and 0.6 in almost all frequencies at the all sites. Therefore, it is indispensable to accommodate 3D topographic feature in our data analysis. |
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