2010 Volume 66 Issue 1 Pages 181-185
A large amplified meteotsunami (seiche) occurred at Urauchi bay of Kamikoshiki Island on 24-26 February 2009. This study investigated the meteorological conditions related to the event using surface observation and non-hydrostatic meteorological model. The convective systems around the cold front, changed from the stationary front, evolved as the pressure wave band in the middle of the East China Sea while the extratropical low occurred in the north of the front system. The propagation of the pressure wave bands was 20-30m/s corresponding to the low troposphere wind (about 1.5~4 km ASL). Continuous wavelet analysis showed that the peak frequency of the pressure fluctuation was ranged between 10 and 30 minutes, corresponding to the eigenoscillation period of the Urauchi bay of Kamikoshiki Island.