Abstract
Based on data from ground-based vertical sounding stations, the behaviors of the ionosphere F region before a strong M 6.8 earthquake off the coast of Hokkaido, Japan, and during the moderate magnetic storm before this earthquake are compared. It was found that the critical frequency of the ionosphere F region (foF2) above the Wakkanai ground-based ionosphere vertical sounding station, which was located in the preparation zone of this earthquake, suffered a long-term disturbance of slightly more than an hour nearly half a day before the earthquake. The magnitude of earthquake-induced disturbance is comparable to that caused by a magnetic storm.
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Original Russian Text © A.D. Legen’ka, V.V. Hegai, V.P. Kim, 2016, published in Geomagnetizm i Aeronomiya, 2016, Vol. 56, No. 3, pp. 353–364.
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Legen’ka, A.D., Hegai, V.V. & Kim, V.P. Disturbances in the F2 region critical frequency before the earthquake of September 11, 2008 off the coast of Hokkaido, Japan, and during a moderate magnetic storm based on data from ground-based vertical ionosphere sounding stations. Geomagn. Aeron. 56, 331–341 (2016). https://doi.org/10.1134/S0016793216030129
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DOI: https://doi.org/10.1134/S0016793216030129