Abstract
This paper presents the results of statistical analysis of measured tide level and numerical simulation of the secondary undulation by using the characteristic method induced by Tsunami at Hinase harbour in Okayama prefecture. Tsunami generated by the earthquake at the offshore of Chile on 27th January 2010 and the offshore of Tohoku on 11th March 2011 propagates to Seto Inland Sea, the secondary undulation is observed at Hinase harbour in Okayama prefecture. In 2010 and 2011, the maximum sea-level departures at Hinase are 0. 53 m and 0. 47 m, respectively. According to the spectral analysis, wave energy that wave period is about 39-93 min is large. The calculated root mean square of sea-level departure at Hinase is about 0. 23m and 0. 16m in 2010 and 2011 respectively, these values are equal to the observed ones approximately. In 2010 and 2011, the calculated root mean square of sea-level departure at Hinase is about 3 times as much as the observed one at Himeji harbour, so the resonance phenomenon is significant.
