Observations of Dominant Periods at Bays in Kii Peninsula and the Tsunami Response

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  • 紀伊半島沿岸における湾の卓越周期の測定と津波に対する応答
  • キイハントウ エンガン ニ オケル ワン ノ タクエツ シュウキ ノ ソクテイ ト ツナミ ニ タイスル オウトウ

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Abstract

We observed seiches at 28 bays in Kii Peninsula, Japan, by the use of a pressure gauge and determined the dominant periods from the spectra. The spectra were extracted from time series of 1 minute sampling for 6 hours using Hanning window. Comparing the dominant periods with the maximum wave heights observed at the heads in the 1944 Tonankai tsunami and the 1960 Chilean tsunami, we obtained tsunami height dependence on the dominant period. Moreover, a tsunami height ratio, defined as a ratio of the maximum tsunami height at the head to that at the open coast, was plotted as a function of the dominant period. They showed the maximums at 12-25 and 31-60 minutes for the 1944 Tonankai tsunami and the 1960 Chilean tsunami, respectively. It was attributed to resonance of bays. At the resonance periods the height ratios are 2 for 1944 and 4 for 1960 tsunamis, respectively. The dominant periods, thus obtained, are useful as basic data for predicting tsunami amplifications of bays.

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