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| Titel |
Meteotsunamis: atmospherically induced destructive ocean waves in the tsunami frequency band |
| VerfasserIn |
S. Monserrat, I. Vilibić, A. B. Rabinovich |
| 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 ; 6, no. 6 ; Nr. 6, no. 6 (2006-12-12), S.1035-1051 |
| Datensatznummer |
250003814
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| Publikation (Nr.) |
 copernicus.org/nhess-6-1035-2006.pdf |
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| Zusammenfassung |
| In light of the recent enhanced activity in the study of tsunami waves and
their source mechanisms, we consider tsunami-like waves that are induced by
atmospheric processes rather than by seismic sources. These waves are mainly
associated with atmospheric gravity waves, pressure jumps, frontal passages,
squalls and other types of atmospheric disturbances, which normally generate
barotropic ocean waves in the open ocean and amplify them near the coast
through specific resonance mechanisms (Proudman, Greenspan, shelf, harbour).
The main purpose of the present study is to describe this hazardous
phenomenon, to show similarities and differences between seismic and
meteorological tsunamis and to provide an overview of meteorological
tsunamis in the World Ocean. It is shown that tsunamis and meteotsunamis
have the same periods, same spatial scales, similar physical properties and
affect the coast in a comparably destructive way. Some specific features of
meteotsunamis make them akin to landslide-generated tsunamis. The generation
efficiency of both phenomena depend on the Froude number (Fr), with
resonance taking place when Fr~1.0. Meteotsunamis are much less energetic than
seismic tsunamis and that is why they are always local, while seismic
tsunamis can have globally destructive effects. Destructive meteotsunamis
are always the result of a combination of several resonant factors; the low
probability of such a combination is the main reason why major meteotsunamis
are infrequent and observed only at some specific locations in the ocean. |
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