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| Titel |
Near-source observations and modeling of the Kuril Islands tsunamis of 15 November 2006 and 13 January 2007 |
| VerfasserIn |
A. B. Rabinovich, L. I. Lobkovsky, I. V. Fine, R. E. Thomson, T. N. Ivelskaya, E. A. Kulikov |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: 2nd EGU Alexander von Humboldt Conference "The role of Geophysics in Natural Disaster Prevention" ; Nr. 14 (2008-01-02), S.105-116 |
| Datensatznummer |
250012090
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| Publikation (Nr.) |
 copernicus.org/adgeo-14-105-2008.pdf |
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| Zusammenfassung |
| Two major earthquakes near the Central Kuril Islands
(Mw=8.3 on 15 November 2006 and Mw=8.1 on 13 January 2007)
generated trans-oceanic tsunamis recorded over the entire Pacific Ocean. The
strongest oscillations, exceeding several meters, occurred near the source
region of the Kuril Islands. Tide gauge records for both tsunamis have been
thoroughly examined and numerical models of the events have been
constructed. The models of the 2006 and 2007 events include two important
advancements in the simulation of seismically generated tsunamis: (a) the
use of the finite failure source models by Ji (2006, 2007) which provide
more detailed information than conventional models on spatial displacements
in the source areas and which avoid uncertainties in source extent; and (b)
the use of the three-dimensional Laplace equation to reconstruct the initial
tsunami sea surface elevation (avoiding the usual shallow-water
approximation). The close agreement of our simulated results with the
observed tsunami waveforms at the open-ocean DART stations support the
validity of this approach. Observational and model findings reveal that
energy fluxes of the tsunami waves from the source areas were mainly
directed southeastward toward the Hawaiian Islands, with relatively little
energy propagation into the Sea of Okhotsk. A marked feature of both
tsunamis was their high-frequency content, with typical wave periods ranging
from 2–3 to 15–20 min. Despite certain similarities, the two tsunamis were
essentially different and had opposite polarity: the leading wave of the
November 2006 trans-oceanic tsunami was positive, while that for the January
2007 trans-oceanic tsunami was negative. Numerical modeling of both tsunamis
indicates that, due to differences in their seismic source properties, the
2006 tsunami was more wide-spread but less focused than the 2007 tsunami. |
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