02444nas a2200373   4500000000100000000000100001008004100002260000800043653006000051653001200111653001900123653006100142653004600203653002200249653001900271653002000290653001500310653002800325100001300353700001700366700001400383700001200397700001700409700001600426700001400442700001400456700001300470245016000483856004300643300001100686490000700697520135200704020001402056       2011                            d  bAGU10a3045 Marine Geology and Geophysics: Seafloor morphology10ageology10aand geophysics10a3070 Marine Geology and Geophysics: Submarine landslides10a8404 Volcanology: Volcanoclastic deposits10adebris avalanches10aflank collapse10aLesser Antilles10aMontserrat10asubmarine slope failure1 aE. Lebas1 aA. Le Friant1 aG. Boudon1 aS. Watt1 aP.J. Talling1 aN. Feuillet1 aC. Deplus1 aC. Berndt1 aM. Vardy00aMultiple widespread landslides during the long-term evolution of a volcanic island: Insights from high-resolution seismic data, Montserrat, Lesser Antilles  uhttp://dx.doi.org/10.1029/2010GC003451  aQ050060 v123 aNew 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 (\~20 km3) 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 Soufrière Hills-Soufrière 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 (\~520 km2), with a total volume of \~40 km3. 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.  a1525-2027