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On meteotsunamis around Tsushima Strait generated by the Baiu front

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Abstract

On July 15, 2009, a meteotsunami occurred over Tsushima Strait and flood damage was recorded on the west coast of Tsushima Island. This study investigated the meteorological systems related to that meteotsunami event using surface observation data, grid-point value data, and a mesoscale meteorological model. The mid-latitude trough in the mid-troposphere approached the moist air of the Baiu precipitation system, and a cold downdraft occurred over a wide area of western Japan. In the western Tsushima Strait, the warm, moist air of the lower atmosphere kept the front of the cold downdraft stationary. Around this area, an atmospheric gravity wave was generated continuously with the wave-conditional instability of the second kind mechanism and propagated toward Tsushima Island. The atmospheric gravity wave generated a pressure disturbance at sea level, which produced the meteotsunami. The frequency of the pressure disturbance using the numerical model had a peak in the 5- to 20-min period range, which corresponded with the peak frequency range of the observed tidal records.

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  1. Department of Global Environmental Studies, Hiroshima Institute of Technology, Hiroshima, Japan

    Kenji Tanaka

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  1. Kenji Tanaka
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Correspondence to Kenji Tanaka.

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Tanaka, K. On meteotsunamis around Tsushima Strait generated by the Baiu front. Nat Hazards 63, 805–822 (2012). https://doi.org/10.1007/s11069-012-0186-5

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  • DOI: https://doi.org/10.1007/s11069-012-0186-5

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