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Submarine landslides in polar continental margins related to loading/unloading by ice streams

AuthorsLlopart, Jaume ; Urgeles, Roger ; Camerlenghi, Angelo; Vanneste, Maarten; Forsberg, Carl Fredrick
Issue Date1-Nov-2015
Citation7th International Symposium on Submarine Mass Movements and Their Consequences. Conference Abstracts: 82 (2015)
AbstractSubmarine landslides in polar continental margins have been traditionally related to: a) pore pressure build-up due to rapid accumulation of glacial sediments (i.e. glacigenic debris flows); b) fluid flow migration throughout the sedimentary column (i.e. mud volcanoes); c) gas hydrates dissociation or d) earthquakes related to isostatic rebound during ice retreat. Here we consider the effect of ice load at the front of an ice stream over polar continental margin sediments inducing focused fluid flow towards the shelf edge and upper slope. A finite element model based on the shelf and slope stratigraphy and geotechnical characteristics of the Storfjorden Trough Mouth Fan sediments, NW Barents Sea, is used to study the ice load effect. During glacial maxima, ice streams induce pore pressure build-up in continental shelf/upper slope sediments as well as rapid accumulation of glacigenic debris flows in the slope. The overpressure developed during Glacial Maxima remains during the deglacial phase. This overpressure combined with downslope stratification of high water content and low shear stress deglacial/interglacial sediments results in a significant decrease in the factor of safety (FoS) of upper slope sediments, but it is not sufficient alone to trigger slope failure. The overpressures developed during Glacial Maxima that have not fully dissipated yet during the deglacial phase, in combination with increased seismic activity from isostatic rebound during ice retreat, may explain the occurrence of submarine landslides in low slope gradient areas of polar trough mouth fans
Description7th International Symposium on Submarine Mass Movements and Their Consequences, 1-4 November 2015, Wellington, New Zealand
Appears in Collections:(ICM) Comunicaciones congresos
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