TY - ECHAP
KW - Earth and Environmental Science
AU - Barry Voight
AU - Anne Friant
AU - Georges Boudon
AU - Christine Deplus
AU - Jean-Christophe Komorowski
AU - Elodie Lebas
AU - Stephen Sparks
AU - Peter Talling
AU - Jess Trofimovs
AU - Yasuhiro Yamada
AU - Kiichiro Kawamura
AU - Ken Ikehara
AU - Yujiro Ogawa
AU - Roger Urgeles
AU - David Mosher
AU - Jason Chaytor
AU - Michael Strasser
AU - Yasuhiro Yamada
AU - Kiichiro Kawamura
AU - Ken Ikehara
AU - Yujiro Ogawa
AU - Roger Urgeles
AU - David Mosher
AU - Jason Chaytor
AU - Michael Strasser
AB - Long undersea debris runout can be facilitated by a boundary layer formed by weak marine sediments under a moving slide mass. Undrained loading of such offshore sediment results in a profound drop of basal shear resistance, compared to subaerial shear resistance, enabling long undersea runout. Thus large long-runout submarine landslides are not truly enigmatic (Voight and Elsworth 1992, 1997), but are understandable in terms of conventional geotechnical principles. A corollary is that remoulded undrained strength, and not friction angle, should be used for basal resistance in numerical simulations. This hypothesis is testable via drilling and examining the structure at the soles of undersea debris avalanches for indications of incorporation of sheared marine sediments, by tests of soil properties, and by simulations. Such considerations of emplacement process are an aim of ongoing research in the Lesser Antilles (Caribbean Sea), where multiple offshore debris avalanche and dome-collapse debris deposits have been identified since 1999 on swath bathymetric surveys collected in five oceanographic cruises. This paper reviews the prehistoric and historic collapses that have occurred offshore of Antilles arc islands and summarizes ongoing research on emplacement processes.
CY - Dordrecht
N2 - Long undersea debris runout can be facilitated by a boundary layer formed by weak marine sediments under a moving slide mass. Undrained loading of such offshore sediment results in a profound drop of basal shear resistance, compared to subaerial shear resistance, enabling long undersea runout. Thus large long-runout submarine landslides are not truly enigmatic (Voight and Elsworth 1992, 1997), but are understandable in terms of conventional geotechnical principles. A corollary is that remoulded undrained strength, and not friction angle, should be used for basal resistance in numerical simulations. This hypothesis is testable via drilling and examining the structure at the soles of undersea debris avalanches for indications of incorporation of sheared marine sediments, by tests of soil properties, and by simulations. Such considerations of emplacement process are an aim of ongoing research in the Lesser Antilles (Caribbean Sea), where multiple offshore debris avalanche and dome-collapse debris deposits have been identified since 1999 on swath bathymetric surveys collected in five oceanographic cruises. This paper reviews the prehistoric and historic collapses that have occurred offshore of Antilles arc islands and summarizes ongoing research on emplacement processes.
PB - Springer Netherlands
PP - Dordrecht
PY - 2012
SN - 978-94-007-2162-3
SP - 417
EP - 428
TI - Undrained Sediment Loading Key to Long-Runout Submarine Mass Movements: Evidence from the Caribbean Volcanic Arc
UR - http://dx.doi.org/10.1007/978-94-007-2162-3_37
VL - 31
ER -