Abstract
Runup data in Hokkaido and in three prefectures in the Tohoku District are described with a few witnessed arrival times and with comments of tide records. The highest runup of 31.7 m was found at the bottom of a narrow valley on the west coast of Okushiri Island. In order to explain high runups of 20 m at Hamatsumae in the sheltered area, roles of edge waves, refraction of the Okushiri Spur and tsunami generation by causes other than the major fault motion should be understood. An early arrival of the tsunami on the west coast of Hokkaido suggests another tsunami generation mechanism in addition to the major fault motion.
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References
Hokkaido Tsunami Survey Group (1993),Tsunami Devastates Japanese Coastal Region, EOS, Trans. AGU74, 417–432.
Research Group for aftershocks of the July 12 (1993), Hokkaido-nansei-oki Earthquake, 1993,Geometry of the Aftershocks of the July 12, 1993, Hokkaido-Nansei-oki Earthquake, Programme and Abstracts, Seismol. Soc. Japan15 (in Japanese).
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Shuto, N., Matsutomi, H. Field survey of the 1993 Hokkaido Nansei-Oki earthquake tsunami. PAGEOPH 144, 649–663 (1995). https://doi.org/10.1007/BF00874388
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DOI: https://doi.org/10.1007/BF00874388