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タイトル: 69. 1968年十勝沖地震にともなう津波の調査
その他のタイトル: 69. A Survey of a Tsunami Accompanying the Tokachi-oki Earthquake of May, 1968
著者: 梶浦, 欣二郎
羽鳥, 徳太郎
相田, 勇
小山, 盛雄
著者(別言語): Kajiura, Kinjiro
Hatori, Tokutaro
Aida, Isamu
Koyama, Morio
発行日: 1969年3月17日
出版者: 東京大学地震研究所
掲載誌情報: 東京大学地震研究所彙報. 第46冊第6号, 1969.3.17, pp. 1369-1396
抄録: The earthquake occurred at 09 : 49, May 16, 1968 at 40.7°N, 143.6°E. The depth of the earthquake was 0 km. A tsunami was generated and arrived at the coasts of Hokkaido and Sanriku in the north-eastern part of Japan, in several ten minutes after the occurrence of the earthquake. The distribution of the tsunami height along the Sanriku coast is shown in Fig. 1. The maximum tsunami height of about 4 m above T. P. (roughly equal to the mean sea level) was observed in the vicinity of Kuji and Noda. The wave periods in most places were around 20 minutes but the tsunami recorder at Miyagi-Enoshima indicates the period of 10 minutes for the first few waves. The generating area of the tsunami estimated from tide gauge records is shown in Fig. 3. The area extends 230 km in the SE-NW direction. Judging from the initial motion of the tsunami observed by tide gauges, the subsidence of the bottom may have occurred in the north-western part of the tsunami source, and the upheaval in the south-eastern part. According to the statistical formula given by lida, this tsunami is of the standard size in both the wave height and the source dimension. The detailed descriptions of the tsunami are given for the areas (Hachinohe-Kesen'numa) surveyed by members of the Earthquake Research Institute. Since this tsunami arrived along the coasts at the time of a spring low tide, the inundation on land was not so wide-spread. However, the magnitude of the tsunami was not so small and fisheries suffered great property damage.
URI: http://hdl.handle.net/2261/12440
ISSN: 00408972
出現カテゴリ:東京大学地震研究所彙報
東京大学地震研究所彙報

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