著者

羽鳥 徳太郎 小山 盛雄

出版者

東京大学地震研究所

雑誌

東京大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.49, no.1/3, pp.127-142, 1971-09-30

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For the tsunamis which were generated off the Pacific coast of Japan during the last 76 years (1894-1969), the tsunami travel times observed at 12 tide stations are listed in Table 1. Features of the frequency distribution of travel time for NE Japan are different from those for SW Japan, because of the difference of the geographic characteristics of the tsunami source (Fig. 1). In the former region, a large frequency is found in the range of 30~40min, in contrast to 10~20m in the latter region. Starting from 19 tide stations indicated in Fig. 2, the inverse refraction diagrams of long waves are drawn on bathymetric charts (Figs. 3-12). Wave fronts are shown at 2min intervals. The uncertainty of the diagrams may be within ±2min for most of the regions considered.