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| Titel |
Elastic oscillations of water column in the 2003 Tokachi-oki tsunami source: in-situ measurements and 3-D numerical modelling |
| VerfasserIn |
M. A. Nosov, S. V. Kolesov |
| 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 ; 7, no. 2 ; Nr. 7, no. 2 (2007-04-02), S.243-249 |
| Datensatznummer |
250004448
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| Publikation (Nr.) |
 copernicus.org/nhess-7-243-2007.pdf |
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| Zusammenfassung |
| During the 2003 Tokachi-Oki tsunamigenic earthquake the real-time JAMSTEC
observatory obtained records which provided a unique opportunity to have a
look deep inside the tsunami source. Considering water column as a
compressible medium we processed the bottom pressure records in order to
estimate amplitude, duration and velocity of bottom displacement. Spectral
analysis of the records revealed a clear manifestation of the low-frequency
elastic oscillations of water column. We also presented 3-D finite-difference
numerical model developed in the framework of linear potential theory of
ideal compressible fluid to better understand dynamical processes in the
tsunami source. The model reproduces position of the main spectral maximum
rather correctly. However, due to neglecting of crust elasticity and to lack
of exact knowledge of spatiotemporal laws of bottom motion, there is an
essential difference between in-situ observed and computed spectra. |
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