Hayakawa, M.; Izutsu, J.; Nickolaenko, A. P.; Schekotov, A. .; Galuk, Y. P.; Kudintseva, I. G. Schumann Resonance Anomalies Associated With Two (M~7) Tohoku Offshore Earthquakes in the Spring of 2021. Ann. Geophys. 2023, 66, SE640.