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Access to submarine slopes is usually limited and it is often difficult to rely on deep cores or in situ measurements to determine the geotechnical characteristics of the sediments involved in a slide when carrying out back-analyses of submarine mass movements and their consequences. The approach presented here uses geomorphology and basic geomechanical concepts to reduce uncertainties in slope stability and mobility analyses. It shows how geomorphology can be used to select the geomechanical input parameters required in failure and post-failure analyses. Typical parameters derived from such analyses are related to the strength of the material, the pore water pressure at the time of failure, and the rheological properties of post-failure debris or mud flows.

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