Nearshore Flow Velocity of Southwest Hokkaido Earthquake Tsunami
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 126, Issue 3
Abstract
The nearshore flow velocity of the tsunami caused by the Southwest Hokkaido earthquake on July 12, 1993 (MJMA = 7.8), was estimated at Aonae on the southern end of Okushiri Island, Japan, by estimating the forces exerted on damaged structures constructed along the coast of the island through in situ strength tests. The velocity of the tsunami flow was calculated from the estimated tsunami forces using Morison's equation. The in situ strength tests yielded a maximum velocity of 10–18 m/s for a tsunami arriving at Aonae from a northeast direction. A direct estimate of the flow velocity of a tsunami on land is very rare, and the presented results will provide fundamental data for designing coastal structures to prevent subsequent tsunami disasters. If the flow velocity, together with the advancing direction and the true height of a tsunami could be predicted quantitatively, this analysis would be a powerful tool for the future assessment of tsunami disasters in other areas.
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Information
Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 126 • Issue 3 • May 2000
Pages: 136 - 143
History
Received: Dec 8, 1998
Published online: May 1, 2000
Published in print: May 2000
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