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• W2055832005 endingPage "214" @default.
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• W2055832005 abstract "Abstract In this paper, we present the current practice of investigations of seafloor instabilities and deformation processes, based on extensive research conducted over the last years, which sets the scene for future research activities in this field. The mapping of the continental margins and coastal areas with ever increasing resolution systematically reveals evidence of instabilities and deformation processes, both active and palaeo-features. In order to properly assess the hazards and risks related to these features, an integrated and multi-disciplinary approach is essential, but challenging. Such an approach consists of combining field data (geophysics, geology, sedimentology, geochemistry and geotechnical data) with numerical simulations constrained by results from laboratory data. As such, it is of paramount importance to build a common knowledge base and understanding that unify these disciplines into more complete and conceptual models constrained by all the data. We review the status of this integrated approach adapted to palaeo-landslides (e.g., Storegga, Ana, Vesteralen) and recent deformations (Finneidfjord, Nice, Gulf of Guinea), allowing to identify gaps in our knowledge at these sites. By reviewing these case studies, one can conclude that each case remains highly site-specific in which both the regional and local geological–tectonic settings have a distinct effect of the type of instability or deformation taking place (or that can take place). Our knowledge on the actual triggers remains poorly constrained, and there is even ambiguity for historic landslides (e.g., Finneidfjord). Also our knowledge of the preconditioning factors is incomplete. There is a general lack of geotechnical data, both in situ and from laboratory, and therefore, modelling the dynamics (e.g., rheology) of the instabilities relies on a number of assumptions rather than facts. In addition, excess pore pressure and its evolution is one of the key parameters driving instabilities. Despite this fact, in situ (excess) pore pressure is rarely measured or monitored. Much work remains to be done to relate and integrate geotechnical data with geophysics, e.g., through inversion and rock physical models, in order to obtain additional quantitative information from the sub-surface, but also with respect to partial saturation (free gas, hydrate) and pore pressure behaviour, or lithologies. It is of critical importance to be able to identify the different processes which can lead to hazardous situations which include establishing recurrence intervals (timing and frequencies, through event recognition and age control) and magnitudes, so that proper mitigation measures can be developed. In this perspective, the smaller-scale instabilities deserve much attention, as there are many instances where such features had far-reaching consequences for society (e.g., Nice, Finneidfjord). In that perspective, human interferences (e.g., exploitation, drilling, blasting, loading) must be one of the factors that should be taken into consideration." @default.
• W2055832005 created "2016-06-24" @default.
• W2055832005 creator A5058020135 @default.
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• W2055832005 creator A5061358850 @default.
• W2055832005 creator A5066123360 @default.
• W2055832005 creator A5084490552 @default.
• W2055832005 date "2014-06-01" @default.
• W2055832005 modified "2023-10-17" @default.
• W2055832005 title "Seafloor instabilities and sediment deformation processes: The need for integrated, multi-disciplinary investigations" @default.
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