Anomalies of Schumann resonances as observed near Nagoya associated with two huge (M∼7) Tohoku offshore earthquakes in 2021

Hayakawa, M.; Izutsu, J.; Schekotov, A.Y.; Nickolaenko, A.P.; Galuk, Y.; Kudintseva, I.G.

Авторы: Hayakawa M., Izutsu J., Schekotov A.Yu, Nickolaenko A.P., Galuk YuP, Kudintseva I.G.
Журнал: Journal of Atmospheric and Solar-Terrestrial Physics
Том: 225
Номер: 105761
Год издания: 2021
Издательство: Pergamon Press Ltd.
Местоположение издательства: United Kingdom
Первая страница: 1
Последняя страница: 9
DOI: 10.1016/j.jastp.2021.105761
Аннотация: Anomalies in Schumann resonance (SR) (or global electromagnetic ELF (extremely low frequency) resonance dueto global lightning activity in the Earth-ionosphere cavity) attract lot of attention in possible association withearthquakes (EQs). The first anomalies were observed in Japan for EQs in Taiwan when the distance betweenobservatory and the EQ epicenter was a few Mm (1 Mm = 1000 km). Recently, Hayakawa et al. (2019, 2020a, b)have suggested a new SR anomaly related to the nearby (a few hundred km) EQs unlike the previous distant EQs.This paper presents the SR anomalies observed in the vicinity of Nagoya-city for two relatively close (~1000 km)successive EQs of the magnitude around 7 that occurred offshore the Tohoku prefecture in Japan. The anomaly ischaracterized by the enhancement in amplitudes of SR modes, and this abnormal behavior was detected beforeand after each of the two EQs. Observational data were interpreted using the seismogenic perturbations of thelower ionospheric conductivity. Model computations imply the full wave solution of ELF electromagneticproblem in form of Riccati equation and the 2D telegraph equations. We show that observed anomalous alterationsin the SR spectra might be attributed to two types of seismogenic modifications: the compression or theexpansion of the vertical profiles of mesosphere conductivity over the EQ epicenter.
Добавил в систему: Щекотов Александр Юрьевич

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Anomalies of Schumann resonances as observed near Nagoya associated with two huge (M∼7) Tohoku offshore earthquakes in 2021статья

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