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<p>The establishment of the tsunami detection network by the Russian Tsunami Warning Service (TWS) at primary ports of the Kuril Islands, alongside the deployment of autonomous bottom pressure recorders by the Institute of Marine Geology and Geophysics of the Far Eastern Branch of the Russian Academy of Sciences in the coastal areas of the South Kuril Islands—primarily within the bays of Shikotan Island—has enabled the recording of multiple meteorologically-induced anomalous sea-level oscillations that resemble tsunamis between 2009 and 2020. This study presents a detailed analysis of an event that occurred on October 16, 2011, in the South Kuril Islands, recorded by six bottom pressure gauges and accompanied by digital atmospheric pressure measurements from three sites. The anomalous sea level oscillations, with a maximum trough-to-crest height of approximately 75&#xa0;cm in Malokurilsk Bay, were triggered by the passage of an atmospheric front characterized by a 6&#xa0;hPa pressure drop and a northeastward propagation speed of 100&#xa0;km/h. This generation mechanism closely resembles that of the most significant meteotsunami recorded in the Russian Far East, which took place on October 1, 2018. In this event, the wave height reached 189&#xa0;cm on the ocean side of Shikotan Island, a level comparable to that of moderate seismic tsunamis. Additionally, two further events are briefly described. The analysis of meteotsunami records and spectra, combined with high-resolution numerical simulations of the long-wave response to atmospheric disturbances, reveals that rapidly propagating atmospheric fronts along the Lesser Kuril Ridge can induce hazardous sea level oscillations in the bays of Shikotan Island, driven by specific resonant mechanisms. These oscillations occur concurrently with long ocean waves approaching the island from both its southeastern and northwestern sides. This phenomenon is attributed to Proudman resonance, which occurs in open sea areas where the propagation speed of the atmospheric front closely matches the phase speed of shallow-water waves. We examined the sensitivity of meteotsunami spectra to the propagation speed of the atmospheric front and identified narrow-band patterns of amplification. These findings enhance regional hazard assessments by providing a deeper understanding of the underlying processes and their potential impact on coastal communities.</p>

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Meteotsunamis in the area of the South Kuril Islands: observations and numerical modeling

  • 期刊论文

  • 发表日期：

    2026年3月13日

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  • Georgy Shevchenko,
  • Artem Loskutov,
  • Alexander Shishkin

摘要

The establishment of the tsunami detection network by the Russian Tsunami Warning Service (TWS) at primary ports of the Kuril Islands, alongside the deployment of autonomous bottom pressure recorders by the Institute of Marine Geology and Geophysics of the Far Eastern Branch of the Russian Academy of Sciences in the coastal areas of the South Kuril Islands—primarily within the bays of Shikotan Island—has enabled the recording of multiple meteorologically-induced anomalous sea-level oscillations that resemble tsunamis between 2009 and 2020. This study presents a detailed analysis of an event that occurred on October 16, 2011, in the South Kuril Islands, recorded by six bottom pressure gauges and accompanied by digital atmospheric pressure measurements from three sites. The anomalous sea level oscillations, with a maximum trough-to-crest height of approximately 75 cm in Malokurilsk Bay, were triggered by the passage of an atmospheric front characterized by a 6 hPa pressure drop and a northeastward propagation speed of 100 km/h. This generation mechanism closely resembles that of the most significant meteotsunami recorded in the Russian Far East, which took place on October 1, 2018. In this event, the wave height reached 189 cm on the ocean side of Shikotan Island, a level comparable to that of moderate seismic tsunamis. Additionally, two further events are briefly described. The analysis of meteotsunami records and spectra, combined with high-resolution numerical simulations of the long-wave response to atmospheric disturbances, reveals that rapidly propagating atmospheric fronts along the Lesser Kuril Ridge can induce hazardous sea level oscillations in the bays of Shikotan Island, driven by specific resonant mechanisms. These oscillations occur concurrently with long ocean waves approaching the island from both its southeastern and northwestern sides. This phenomenon is attributed to Proudman resonance, which occurs in open sea areas where the propagation speed of the atmospheric front closely matches the phase speed of shallow-water waves. We examined the sensitivity of meteotsunami spectra to the propagation speed of the atmospheric front and identified narrow-band patterns of amplification. These findings enhance regional hazard assessments by providing a deeper understanding of the underlying processes and their potential impact on coastal communities.