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 are 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-negligeable risk from generation of tsunamis associated with potential future edifice collapse.
Comptes rendus Géosciences