Distribution of maximum water levels due to the Japan Sea Tsunami on 26 May 1983.

概要

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By measuring the maximum water level of thetraces attained by the Japan Sea Tsunami on 26 May 1983, we obtained the distribution along the west coast of the northeast Japan. The level reaches a maximum at the coast eastward of the epicenter and decreases with the relationship 8.6 e<SUP>-0.017x</SUP> (m) with distance <I>x</I> (km) measured from the coast nearest to the epicenter. A small increase of levels was observed at coasts to the south of the tsunami source having distance larger than 200 km. With the aid of tide gauge records we revealedan excitation of edge wave which brought about the small increase of levels at the southern coast. In comparison with the decrease with distance obtained on the coasts of the main islands of Japan, some noticeable peaks were observed at several small islands. It is suggested that the reason why a short period component is predominant for the initial wave motion of tsunami is that the source region has depth of 3, 000meters. The feature of wave period is discussed in comparison with that of the 1964 Niigata Tsunami.
日本海洋学会の論文