Analysis on Meteotsunami Occurred at Tsushima Strait along with Baiu Front Moving South

Abstract

On 15 July 2009, a meteotsunami occurred at Tsushima Strait and with the flood damage at Sasuna community area in the west of Tsushima Island. This study analyzed the meteorological conditions in relation to the meteotsunami event. The baiu front system moved south from Korean Peninsula to the north Kyushu and San-in area in the morning of 15 July, accompanied with the strong cold downdraft. The pressure disturbance occurred by the acoustic gravity mode 100-120 km west from Tsushima Island in the middle of the strait, where the surface moist air from the southwest was lifted by cold downdraft. The cycle of the pressure disturbances were around 10 minutes, which is nearly same as the eigenoscillation of the small bays of the Tsushima.