Morphological control of slope instability in contourites: a geotechnical approach

Type Article
Date 2018-06
Language English
Author(s) Miramontes Elda1, 2, Garziglia Sebastien1, Sultan NabilORCID1, Jouet Gwenael1, Cattaneo AntonioORCID1
Affiliation(s) 1 : IFREMER, Geosci Marines, F-29280 Plouzane, France.
2 : IUEM UBO, CNRS, UMR6538, Domaines Ocean, F-29280 Plouzane, France.
Source Landslides (1612-510X) (Springer Heidelberg), 2018-06 , Vol. 15 , N. 6 , P. 1085-1095
DOI 10.1007/s10346-018-0956-6
WOS© Times Cited 38
Keyword(s) Sediment drift, Submarine landslide, Undrained shear strength, Hemipelagite, Mediterranean Sea

Contourite drifts are sediment bodies formed by the action of bottom currents. They are common features found on continental slopes and are often affected by slope failure. However, processes controlling slope instability in contourite depositional systems are still not well constrained, and it is not clear whether contourites have particular properties that make them more susceptible to slope failure. In this study, we compare sedimentological and geotechnical properties of contouritic and hemipelagic sediments within the Corsica Trough (northern Tyrrhenian Sea) using geophysical data sets and sediment cores in order to get a better understanding of the controlling factors of slope stability. Geomorphological and slope stability analyses reveal that differences in sediment properties have little influence on the location of submarine landslides, in comparison with the morphology of the drifts. Hence, the steep downslope flanks of plastered drift deposits are the most susceptible zones for local failure initiation. Moreover, as erosion is common at the foot of plastered drifts, undercutting is thought to contribute to the development of large-scale failure up to the point that submarine landslides are triggered.

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