Development research on new method for resistivity imaging using artificial electric noise caused by DC-railway leakage current

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In order to develop new method for underground resistivity imaging using artificial electric noise, which should be removed in ordinary electromagnetic surveys, caused by DC-railway leakage current, werevealed the characteristics of the DC-railway leakage currents by careful scrutiny of existingmultipoint and simultaneous observed electromagnetic data and clarified the issues in case of using leakage currents as active sources. In process of the careful scrutiny, weobtained three-dimensional resistivity image around the focal region of the 2007 Noto Hanto earthquake.