Electric Signals on and under the Ground Surface Induced by Seismic Waves

<table>Raw data recorded before and after the arrival of seismic waves from a M6.3 earthquake: (a) at Honjo, (b) at Kyowa, and (c) at Sennan. Upper row graphs show raw data of the earth potential difference (EPD). Middle ones show raw data of the signals related to the atmospheric electricity (AE). Lower one shows raw data of the ground velocity (only at Sennan). Broken lines show the origin time. The time is in JST (= UT + 9 hr).</table>

International Journal of Geophysics

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Figure 3

Figure 3: Electric Signals on and under the Ground Surface Induced by Seismic Waves 