9. On the Tsunami which accompanied the Niigata Earthquake of June 16, 1964. : Source Deformation, Propagation and Tsunami Run-up

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The distribution of inundation height along the coast near the tsunami source shows two peaks. This feature has close relation to the deformation of the sea bottom in the source area. From a refraction diagram, the initial crest-height at each station along the Japanese coast seems to follow Green's law. The distribution of tsunami energy seems to have been controlled by the submarine topography. The coast near the tsunami source seems to have received strong reflected waves from north Korea. As to other feature of propagation, long-waves propagated along the slope of the continental shelf seem to have existed. From several tide-gauge records, it was concluded that tsunami waves have uniformly decayed. Decay coefficient is approximately 0.043 per hour.1964年6月16日13時02分,新潟県粟島附近で発生した地震(気象庁発表によれば,震央は38.4゜N,139.2°E,深さ40km,マグニチュード約7.7)に伴なつた津波は,浪源附近の沿岸で津波の高さ(M.S.L.上)4～5mに達し,広く日本海全域で観測された.各地の概要はTable 1に示す.この津波の規模は1900年以来,日本海に発生した4回の津波に比し最大で,1833年(天保4年)に今回とほぼ同地域で発生した津波に匹敵する.
1965-07-15