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Data from the very low/low frequency (VLF/LF) receiver in Petropavlovsk-Kamchatsky have been used to study the effects in the lower ionosphere in connection with two strong (М ≥ 6.5) earthquakes in the region of Kamchatka peninsula and in Japan that occurred in April 2023 and January 2024, respectively. Nighttime “bay-like” anomalies in the amplitude and phase of electromagnetic signals were observed during several days before the events and on days of earthquakes in the radio wave paths passing over epicenters’ areas while such anomalies in the signal variations in other radio wave paths passing far away from the epicenters of the earthquakes were not observed. During the intervals under consideration, no influence of other factors (magnetic storms, cyclones) which could cause similar disturbances was observed. We suppose that the anomalies in the radio signals behavior have been caused by the preparation and realization of these earthquakes. Spectral analysis of the seismic-induced disturbed signals revealed fluctuations with time periods in the range of 10–50 min that corresponds to the range of internal gravity waves periods.

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Disturbances of the VLF/LF-Wave Propagation in Association with Strong Seismic Activity of 2023–2024 as Observed on the Kamchatka Peninsula

  • 会议论文

  • 发表日期：

    2026年

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  • Maria S. Solovieva,
  • Galina N. Kopylova,
  • Galia M. Korkina,
  • Nadezhda R. Bulatova,
  • Victoria A. Kasimova

摘要

Data from the very low/low frequency (VLF/LF) receiver in Petropavlovsk-Kamchatsky have been used to study the effects in the lower ionosphere in connection with two strong (М ≥ 6.5) earthquakes in the region of Kamchatka peninsula and in Japan that occurred in April 2023 and January 2024, respectively. Nighttime “bay-like” anomalies in the amplitude and phase of electromagnetic signals were observed during several days before the events and on days of earthquakes in the radio wave paths passing over epicenters’ areas while such anomalies in the signal variations in other radio wave paths passing far away from the epicenters of the earthquakes were not observed. During the intervals under consideration, no influence of other factors (magnetic storms, cyclones) which could cause similar disturbances was observed. We suppose that the anomalies in the radio signals behavior have been caused by the preparation and realization of these earthquakes. Spectral analysis of the seismic-induced disturbed signals revealed fluctuations with time periods in the range of 10–50 min that corresponds to the range of internal gravity waves periods.