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| | Abstract | | We conducted electric (direct current, DC), transient electromagnetic (TEM), and boring surveys to investigate the subsurface resistivity structure of the southern part of the Sendai Plain in northeastern Japan that was intruded by seawater from the tsunami on March 11, 2011. The main purpose of the survey was to confirm the previous result of a helicopter-borne EM measurement that was also carried out in June 2012. The TEM results show a resistivity distribution to depths of approximately 150 m while the DC measurements show a detailed 2D resistivity distribution to a depth of 20 m. We also measured the boring core surface and pore water resistivity, and conducted pore water analysis to a depth of about 30 m. These results correlate well with the apparent resistivity model of the helicopter-borne EM investigation. In addition, further multiple resistivity surveys |
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