Modeling of the runup heights of the Hokkaido-Nansei-Oki tsunami of 12 July 1993 |
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Authors: | Katsuyuki Abe |
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Institution: | (1) Earthquake Research Institute, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, 113 Tokyo, Japan |
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Abstract: | 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 magnitudeM
t
is determined to be 8.1 from the maximum amplitudes of the tsunami recorded on tide gauges. This value is larger thanM
w
by 0.4 units. It is suggested that the tsunami potential of the Nansei-Oki earthquake is large forM
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 heightsH
n
for 23 segments in intervals of about 40 km each. The geographic variation ofH
n
is approximately explained in terms of the empirical relationship proposed byAbe (1989, 1993). The height prediction from the available earthquake magnitudes ranges from 5.0–8.4 m, which brackets the observed maximum ofH
n
, 7.7 m, at Okushiri Island. |
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Keywords: | Tsunami magnitude runup tsunami warning |
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