CUED Publications database

Seismic triggering of submarine slides in soft cohesive soil deposits

Biscontin, G and Pestana, JM and Nadim, F (2004) Seismic triggering of submarine slides in soft cohesive soil deposits. Marine Geology, 203. pp. 341-354. ISSN 0025-3227

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Abstract

The geological profile of many submerged slopes on the continental shelf consists of normally to lightly overconsolidated clays with depths ranging from a few meters to hundreds of meters. For these soils, earthquake loading can generate significant excess pore water pressures at depth, which can bring the slope to a state of instability during the event or at a later time as a result of pore pressure redistribution within the soil profile. Seismic triggering mechanisms of landslide initiation for these soils are analyzed with the use of a new simplified model for clays which predicts realistic variations of the stress-strain-strength relationships as well as pore pressure generation during dynamic loading in simple shear. The proposed model is implemented in a finite element program to analyze the seismic response of submarine slopes. These analyses provide an assessment of the critical depth and estimated displacements of the mobilized materials and thus are important components for the estimation of submarine landslide-induced tsunamis. © 2003 Elsevier B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Slope stability Soft clay Soil deformation Soil dynamics Submarine landslides
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:25
Last Modified: 08 Dec 2014 02:24
DOI: 10.1016/S0025-3227(03)00314-1