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 , Talling, Peter J., Zervos, Antonis, 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. Open Access In: Submarine Mass Movements and Their Consequences. , ed. by Yamada, Yasuhiro, Kawamura, Kiichiro, Ikehara, Ken, Ogawa, Yujiro, Urgeles, Roger, Mosher, David, Chaytor, Jason and Strasser, Michael. Advances in Natural and Technological Hazards Research, 31 . Springer, Dordrecht, Netherlands, pp. 277-287. ISBN 978-94-007-2161-6 DOI 10.1007/978-94-007-2162-3_25.

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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.

Document Type: Book chapter
Keywords: Overpressure; Continental margin; Submarine landslide; Slope ­stability modelling
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1007/978-94-007-2162-3_25
Date Deposited: 13 Jun 2018 12:30
Last Modified: 13 Jun 2018 12:30
URI: http://oceanrep.geomar.de/id/eprint/43262

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