The Oshima tsunami of Aug. 29, 1741 (Kampo 1) is the largest tsunami (Imamura-Iida scale m=3) generated in the Japan Sea. According to old documents, the wide area (length 500 km) from west Hokkaido, Tsugaru to Sado Is. suffered severe damage by this tsunami. 1,467 persons were drowned at various villages within 120 km (Matsumae to Kumaishi) along the west coast of the Oshima Peninsula. In the temples of Matsumae and Esashi, there are old monuments which were built just after the tsunami to pray for the repose of the tsunami victims. From the present field investigation, these tsunami monuments are illustrated. Considering ground level, inundation heights of the tsunami along the west coast of the Oshima Peninsula seem to have reached 6 to 8 m with the localized run-up maximum of about 15 meters. The eruptions of the Oshima volcano began 11 days before the tsunami generation and the volcanic activity continued for three months, but earthquakes were not recorded. Judging from the tsunami magnitude and the distribution pattern of wave-heights, it seems that the source area of tsunami extends 100 km or more along a bathymetric line of 3,000 m off the Oshima Peninsula.
雑誌名
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo
巻
54
号
2
ページ
343 - 350
発行年
1979-12-25
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
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北海道渡島大島津波(1741年)の供養碑
ji0542006.pdf
(1.22MB)
