Fig. 3
Plan views of results relative to the origin point (32°06.2′N, 139°52.0′E): a Electric field along the dive track and b effective self-potential. The color scale is explained in the legend at the right of each panel. Numbers in a correspond to the dive tracks, with arrows denoting the survey direction. The dive tracks are basically located in ascending order except for Line 8, which is located between Lines 4 and 5. The polarization of some electric field data in a is inverted so that the survey direction is assumed to be from southwest to northeast (for Lines 1–8) or from west to east (for Lines 9–12)