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L'??le de la Dominique, à l'origine des avalanches de débris les plus volumineuses de l'arc des Petites AntillesThe Island of Dominica,site for the generation of the most voluminous debris avalanches in the Lesser Antilles Arc |
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| Authors: | Anne Le Friant Georges Boudon Jean-Christophe Komorowski Christine Deplus |
| Institution: | 1. Laboratoire de physique des géomatériaux, UMR–CNRS 7046, et Observatoires volcanologiques, Institut de physique du globe de Paris, case 89, 4, place Jussieu, 75252 Paris cedex 05, France;2. Laboratoire de gravimétrie et géodynamique, UMR–CNRS 7096, Institut de physique du globe de Paris, case 89, 4, place Jussieu, 75252 Paris cedex 05, France |
| Abstract: | Results from recent fieldwork and the Aguadomar marine survey in the Lesser Antilles clearly indicate that the volcanic field of southern Dominica has experienced three major edifice collapse events. This led to formation of the most voluminous debris avalanches known in the Caribbean Arc. Submarine hummocky morphology with plurikilometric megablocks is characteristic of debris avalanche deposits. We propose that steep slopes on the western Caribbean side of the island and intense hydrothermal alteration lead to recurrent large-scale edifice collapses. Therefore islands in the Lesser Antilles face a non-negligible risk from generation of tsunamis associated with potential future edifice collapse. To cite this article: A. Le Friant et al., C. R. Geoscience 334 (2002) 235–243. |
| Keywords: | Lesser Antilles Dominica flank-collapse debris avalanches tsunami risk Petites Antilles Dominique déstabilisation de flanc avalanches de débris risque tsunami Géomatériaux Geomaterials |
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