The Hokkaido-Nansei-Oki earthquake (M w 7.7) of July 12, 1993, is one of the largest tsunamigenic events in the Sea of Japan. The tsunami magnitude M1 is determined to be 8.1 from the maximum amplitudes of the tsunami recorded on tide gauges. This value is larger than M w by 0.4 units. It is suggested that the tsunami potential of the Nansei-Oki earthquake is large for M w . A number of tsunami runup data are accumulated for a total range of about 1000 km along the coast, and the data are averaged to obtain the local mean heights H n for 23 segments in intervals of about 40 km each. The geographic variation of H n is approximately explained in terms of the empirical relationship proposed by Abe (1989, 1993). The height prediction from the available earthquake magnitudes ranges from 5.0–8.4m, which brackets the observed maximum of H w , 7.7 m, at Okushiri Island.
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- Modeling of the Runup Heights of the Hokkaido-Nansei-Oki Tsunami of 12 July 1993
- Birkhäuser Basel