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| Titel |
Detailed analysis of tsunami waveforms generated by the 1946 Aleutian tsunami earthquake |
| VerfasserIn |
Y. Tanioka, T. Seno |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 1, no. 4 ; Nr. 1, no. 4, S.171-175 |
| Datensatznummer |
250000221
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| Publikation (Nr.) |
 copernicus.org/nhess-1-171-2001.pdf |
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| Zusammenfassung |
| The 1946
Aleutian earthquake was a typical tsunami earthquake which generated
abnormally larger tsunami than expected from its seismic waves.
Previously, Johnson and Satake (1997) estimated the fault model of this
earthquake using the tsunami waveforms observed at tide gauges. However,
they did not model the second pulse of the tsunami at Honolulu although
that was much larger than the first pulse. In this paper, we numerically
computed the tsunami waveforms using the linear Boussinesq equation to
determine the fault model which explains the observed tsunami waveforms
including the large second pulse observed at Honolulu. The estimated fault
width is 40–60 km which is much narrower than the fault widths of the
typical great underthrust earthquakes, the 1957 Aleutian and the 1964
Alasuka earthquakes. A previous study of the 1896 Sanriku earthquake,
another typical tsunami earthquake, suggested that the additional uplift
of the sediments near the Japan Trench had a large effect on the tsunami
generation. In this study, we also show that the additional uplift of the
sediments near the trench, due to a large coseismic horizon-tal movement
of the backstop, had a significant effect on the tsunami generation of the
1946 Aleutian earthquake. The estimated seismic moment of the 1946
Aleutian earthquake is 17–19 × 1020 20 Nm (Mw 8.1). |
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