Figure 10: Coseismic electric field variation for the Tohoku earthquake (3.11) at Hasaki (lower sheet) and the strong motion seismograph (UD component) at nearest K-net observation site CHB005 (upper sheet, (1): EW, (2): NS, (3): UD). The vertical line “org”, “P”, and “S” are origin time of 3.11, P wave arrival time, and S wave arrival time at CHB, respectively. There is very faint electric phase corresponding P arrival time and none phase corresponding to S arrival. The first large negative peak coincides with the peak acceleration and the second prominent peak did not correspond to any phase.