著者

阿部 邦昭

出版者

日本歯科大学

雑誌

日本歯科大学紀要. 一般教育系 = Bulletin of the Nippon Dental University. General education (ISSN:03851605)

巻号頁・発行日

vol.41, pp.7-12, 2012-03-20

---

We analyzed initial waves of the 2010 Bonin Island tsunami which was recorded at tide stations in Japan. After reducing tidal level from the record we identified the initial wave and determined the arrival time, polarity, double amplitude and period. The amplitude, normalized at 1000 km in the epicentral distance in the assumption of geometrical spreading, was plotted to the period relative to dominant period of seiche. The resonance curve represents itself having the maximum at 1.4. Thus it is concluded that the initial wave follows a law of resonance. It suggests that the initial wave is amplified by the background oscillation.