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EQ and possible signal pairs
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M and d stand for the Japan Meteorological Agency magnitude and focal depth. R, τ, and ΔT are the epicentral distance to concerned station, duration, and lead time of the electric changes. ΔT is defined as the time difference between the onset of change and EQ. EQ source mechanisms are from refs. 10–12 and The National Research Institute of Earth Science and Disaster Prevention (http://argent.geo.bosai.go.jp/freesia/).
