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A superimposed epoch analysis has been undertaken, in order to find the\udcorrelation of the ionospheric perturbations with seismic activity. We take\udthe wave path from the Japanese LF transmitter (frequency=40 kHz) and an\udobserving station of Kochi (wave path length of 770 km), and a much longer\udperiod (of five years) than before, is considered. This subionospheric LF\udpropagation can be called "an integrated measurement" in the sense that any\udearthquakes in the LF sensitive area just around the great-circle path can\udinfluence the observed LF signals, so that we define the "effective\udmagnitude" (Meff) by integrating the total energy from different\udearthquakes in the sensitive area on a current day and by converting it back\udinto magnitude. A superimposed epoch analysis for the effective magnitude\udgreater than 6.0 has yielded that the ionosphere is definitely disturbed in\udterms of both amplitude and dispersion, and that these perturbations tend to\udtake place prior to an earthquake. The statistical z-test has also been\udperformed, which has indicated that the amplitude is definitely depleted 2–6\uddays before the earthquake day and also that the dispersion is very much\udenhanced during the same period. This statistical study has given strong\udsupport to the existence of seismo-ionospheric perturbations for high\udseismic activity

A statistical study on the effect of earthquakes on the ionosphere, based on the subionospheric LF propagation data in Japan