Using many records of past tsunamis, an attempt was made to get more information on tsunamis by means of the spectral analyses of these records. The results of analyses of 8 tsunamis at more than 20 stations are shown in Figs. 1～6, in which we can see that the spectra of tsunamis at these stations are strongly affected by the response characteristics of the bays and shelves where the stations are situated. For example, the spectra obtained at Tosa-shimizu or Miyako have amplitude peaks at definite periods even for different tsunamis. Now, periods of the peaks which are larger than two-thirds of the maximum peak value were shown in Table I and, in the right column, the most predominant one of these periods was shown in comparison with the seich periods of the bay calculated by Dr. Honda and others. In Miyako and Tosashimizu, the results of observations coincide perfectly with calculated values. In Hachinohe, however, the periods of peaks vary from tsunami to tsunami. That is to say, the former stations have the character of sharp resonance, but the latter station has not.
雑誌名
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo
巻
41
号
1
ページ
299 - 314
発行年
1963-06-30
ISSN
00408972
書誌レコードID
AN00162258
フォーマット
application/pdf
日本十進分類法
453
出版者
東京大学地震研究所
出版者別名
Earthquake Research Institute, University of Tokyo
日本沿岸で観測された数箇の津波のスペクトルについて
ji0411020.pdf
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