Multiple widespread landslides during the long-term evolution of a volcanic island: Insights from high-resolution seismic data, Montserrat, Lesser Antilles
| Type | Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Date | 2011-05 | ||||||||
| Language | English | ||||||||
| Author(s) | Lebas E.1, 2, Le Friant A.1, 2, Boudon G.1, 2, Watt S. F. L.3, Talling P. J.4, Feuillet Nathalie1, 2, Deplus Christine1, 2, Berndt C.4, 5, Vardy M. E.3 | ||||||||
| Affiliation(s) | 1 : Inst Phys Globe, F-75238 Paris 05, France. 2 : CNRS, UMR 7154, F-75238 Paris 05, France. 3 : Univ Southampton, Sch Ocean & Earth Sci, Southampton SO14 3ZH, Hants, England. 4 : Natl Oceanog Ctr Southampton, Southampton SO14 3ZH, Hants, England. 5 : Leibniz Inst Marine Sci IFM GEOMAR, D-24148 Kiel, Germany. |
||||||||
| Source | Geochemistry Geophysics Geosystems (1525-2027) (Amer Geophysical Union), 2011-05 , Vol. 12 , N. 5 , P. Q05006 | ||||||||
| DOI | 10.1029/2010GC003451 | ||||||||
| WOS© Times Cited | 45 | ||||||||
| Keyword(s) | debris avalanches, flank collapse, submarine slope failure, Montserrat, Lesser Antilles | ||||||||
| Abstract | New high-resolution multichannel seismic data (GWADASEIS-2009 and JC45/46-2010 cruises; 72 and 60 channels, respectively) combined with previous data (AGUADOMAR-1999 and CARAVAL-2002; 6 and 24 channels, respectively) allow a detailed investigation of mass-wasting processes around the volcanic island of Montserrat in the Lesser Antilles. Seven submarine deposits have sources on the flanks of Montserrat, while three are related to the nearby Kahouanne submarine volcanoes. The most voluminous deposit (similar to 20 km(3)) within the Bouillante-Montserrat half-graben has not been described previously and is probably related to a flank instability of the Centre Hills Volcano on Montserrat, while other events are related to the younger South Soufriere Hills-Soufriere Hills volcanic complex. All deposits are located to the south or southeast of the island in an area delimited by faults of the Bouillante-Montserrat half-graben. They cover a large part of the southeast quarter of the surrounding seafloor (similar to 520 km(2)), with a total volume of similar to 40 km(3). Our observations suggest that the Bouillante-Montserrat half-graben exerts a control on the extent and propagation of the most voluminous deposits. We propose an interpretation for mass-wasting processes around Montserrat similar to what has happened for the southern islands of the Lesser Antilles. | ||||||||
| Full Text |
|