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| Titel |
Numerical modelling of historical landslide-generated tsunamis in the French Lesser Antilles |
| VerfasserIn |
B. Poisson, R. Pedreros |
| 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 ; 10, no. 6 ; Nr. 10, no. 6 (2010-06-17), S.1281-1292 |
| Datensatznummer |
250008234
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| Publikation (Nr.) |
 copernicus.org/nhess-10-1281-2010.pdf |
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| Zusammenfassung |
| Two historical landslide-induced tsunamis that reached the coasts of the
French Lesser Antilles are studied. First, the Martinique coast was hit by a
tsunami down the western flank of Montagne Pelée at the beginning of the
big eruption of May 1902. More recently, the northeastern coast of Guadeloupe
was affected by a tsunami that had been generated around Montserrat by
pyroclastic flows entering the sea, during the July 2003 eruption of the
Soufrière Hills volcano. We use a modified version of the GEOWAVE model to
compute numerical simulations of both events. Two source hypotheses are
considered for each tsunami. The comparison of the simulation results with
reported tsunami height data helps to discriminate between the tested source
decriptions. In the Martinique case, we obtain a better fit to data when
considering three successive lahars entering the sea, as a simplified single
source leads to an overstimation of the tsunami wave heights at the coast. In
the Montserrat case, the best model uses a unique source which volume
corresponds to published data concerning the peak volume flow. These findings
emphasize the importance of an accurate description of the relevant volume as
well as the timing sequence of the source event in landslide-generated
tsunami modelling. They also show that considering far-field effects in
addition to near-field effects may significantly improve tsunami modelling. |
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