Undrained sediment loading key to long-runout submarine mass movements : evidence from the Caribbean Volcanic Arc

Voight, Barry, Friant, Anne, Boudon, Georges, Deplus, Christine, Komorowski, Jean-Christophe, Lebas, Elodie, Sparks, R. Stephen J., Talling, Peter J., & Trofimovs, Jessica (2012) Undrained sediment loading key to long-runout submarine mass movements : evidence from the Caribbean Volcanic Arc. In Yamada, Y., Kawamura, K., & Ikehara, K. (Eds.) Submarine Mass Movements and their Consequences. Springer, Dordrecht, pp. 417-428.

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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.

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ID Code: 52952
Item Type: Book Chapter
Additional Information: Advances in Natural and Technological Hazards Research Volume 31, 2012, pp 417-428; paper presesnted in Submarine mass movements and their consequences : 5th International symposium
Keywords: Submarine Landslide, Submarine Mass Movement, Mass-Transport Deposit, Geohazard, Lesser Antilles, Marine Geophysical Surveys, Undrained Shear Strength, Hydroplaning
DOI: 10.1007/978-94-007-2162-3_37
ISBN: 9789400721623
Divisions: Current > Schools > School of Earth, Environmental & Biological Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 20 Mar 2013 22:02
Last Modified: 12 Jun 2013 15:05

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