M. Hayakawa, J. Izutsu, A. P. Nickolaenko, A. . Schekotov, Y. P. Galuk, and I. G. Kudintseva, “Schumann resonance anomalies associated with two (M~7) Tohoku offshore earthquakes in the spring of 2021”, Ann. Geophys., vol. 66, no. 6, p. SE640, Dec. 2023.