How do ~2° slopes fail in areas of slow sedimentation? A sensitivity study on the influence of accumulation rate and permeability on submarine slope stability


Urlaub, Morelia, Zervos, Antonis, Talling, Peter J., Masson, Doug G. and Clayton, Chris I. (2012) How do ~2° slopes fail in areas of slow sedimentation? A sensitivity study on the influence of accumulation rate and permeability on submarine slope stability. In, Yamada, Yasuhiro, Kawamura, Kiichiro, Ikehara, Ken, Ogawa, Yujiro, Urgeles, Roger, Mosher, David, Chaytor, Jason and Strasser, Michael (eds.) Submarine Mass Movements and Their Consequences. Heidelberg, DE, Springer, 277-287. (Advances in Natural and Technological Hazards Research Series, 31). (doi:10.1007/978-94-007-2162-3_25).

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Description/Abstract

Overpressure generation due to rapid sediment deposition can result in low effective stresses within the sediment column. It has been proposed that these large overpressures are the main preconditioning factor for causing large-scale submarine slope failure on passive continental margins, such as those in the Gulf of Mexico and offshore Norway. The rate of overpressure generation depends on the sedimentation rate, sediment compressibility and permeability. The Gulf of Mexico and the Norwegian continental slope have experienced comparatively high sediment input, but large-scale slope failure also occurs in locations with very low sedimentation rates such as the Northwest African continental margin. Here we show results from 2D numerical modelling of a 2° continental slope subjected to deposition rates of 0.15 m/ka. These results do not indicate any evidence for significant overpressure or slope instability. We conclude that factors other than overpressure must be fundamental for initiating slope failure, at least in locations with low sedimentation rates

Item Type: Book Section
ISBNs: 9789400721616
Keywords: Overpressure, Continental margin, Submarine landslide, Slope ­stability modelling
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
Q Science > QE Geology
Divisions: Faculty of Engineering and the Environment > Civil, Maritime and Environmental Engineering and Science
Faculty of Natural and Environmental Sciences > Ocean and Earth Science > Geology & Geophysics
National Oceanography Centre (NERC) > Marine Geoscience
ePrint ID: 202779
Date Deposited: 09 Nov 2011 15:17
Last Modified: 27 Mar 2014 19:47
Publisher: Springer
URI: http://eprints.soton.ac.uk/id/eprint/202779

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