Fig. 1

(a) Location of survey area in the Kujukuri coastal plain with 5-m bathymetric contours. White dots denote the places where current dipole electrodes were placed. (b) Survey area and flight lines. The thick black line indicates the transmitter cable, which was placed 300–400 m inland and parallel with the coastal line. Meaningful data were obtained along flight lines with a thicker color. A black dot indicates the wellbore site in Hayashi et al. (2009).