Stability Analysis of the Hudson Apron Slope, Off New Jersey, U.S.A.

Locat, Jacques; Desgagnés, Priscilla; Leroueil, Serge; Lee, H. J.

doi:10.1007/978-94-010-0093-2_30

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…An analysis of the geomechanical or geotechnical properties of sediments is paramount in addressing the sediment's role in submarine failure (e.g. Locat et al, 2003a). For the Traenadjupet slide (Fig.…”

Section: Geomechanical Properties Of Sedimentsmentioning

confidence: 99%

Submarine mass movements on glaciated and non-glaciated European continental margins: A review of triggering mechanisms and preconditions to failure

Leynaud

Mienert

Vanneste³

2009

Marine and Petroleum Geology

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Section: Geomechanical Properties Of Sedimentsmentioning

confidence: 99%

Submarine mass movements on glaciated and non-glaciated European continental margins: A review of triggering mechanisms and preconditions to failure

Leynaud

Mienert

Vanneste³

2009

Marine and Petroleum Geology

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“…Factor of safety analysis (e.g., and ) of the slope during sedimentation and overpressure genesis predicted low factors of safety but did not successfully predict unstable conditions (FS < 1) [ Dugan and Flemings , 2002]. Sediment strength analyses coupled with stability modeling for the New England margin concluded that high overpressures and weak sediments are required to drive failures on such low‐angle slopes (<4°) and that the measured shear strength is consistent with marginal stability for the New England slope [ Locat et al , 2003]. Together the overpressure modeling and slope stability assessment successfully reproduce the regional overpressure profile and indicate that high overpressures are required to precondition the slope for repeated failures, such as those that were observed.…”

Section: Examples Of Overpressured Systemsmentioning

confidence: 99%

Offshore sediment overpressures of passive margins: Mechanisms, measurement, and models

Dugan

Sheahan

2012

Reviews of Geophysics

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[1] Fluid pressure in excess of hydrostatic equilibrium, or overpressure, in offshore environments is a widespread phenomenon that contributes to the migration and storage of fluids, solutes, and energy and to the potential mechanical instability of these sediments. Overpressure exists in deep and shallow systems and is most likely to be found where low-permeability (<10 À16 m 2 ) layers have inhibited pore fluid escape or there have been large forcing mechanisms (e.g., rapid sedimentation, tectonic stressing, heating, and volume-creating reactions). The genesis and magnitude of overpressure can be controlled by physical processes (e.g., rapid sedimentation (>mm/yr), tectonic loading, and lateral fluid transfer) and thermal and chemical processes (e.g., aquathermal expansion, hydrocarbon generation, mineral diagenesis, and organic maturation). In systems where nearlithostatic overpressures are generated, potentially unstable sediments are created. Failures of these sediments can create large-scale natural disasters, generate fractures, and damage seafloor and subseafloor infrastructure. Detailed characterization of overpressured systems has been accomplished through geological and geotechnical analyses, including investigation of physical-mechanical properties (mainly porosity, consolidation state, and shear strength), inversion of geophysical data (e.g., compressional and/or shear velocities), measurement of in situ properties, and postevent analyses. Process-based models have been developed to explain the origin of overpressure in terms of rate of overpressure genesis. This allows identification of potentially unstable zones and assessment of the potential for failure. Future development in measurements and in coupling of models will lead to more accurate analysis and prediction of fluid pressure in offshore sediments, which in turn will facilitate better hazard analyses and will enable safer and more cost-effective offshore drilling practices and other offshore infrastructure development.Citation: Dugan, B., and T. C. Sheahan (2012), Offshore sediment overpressures of passive margins: Mechanisms, measurement, and models, Rev. Geophys., 50, RG3001,

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“…The New Jersey study area also showed evidence of mass movements. Locat et al (2003) conducted a geotechnical analysis of a failure on the Hudson Apron slope using results of testing on ODP cores (Austin et al, 1998;Dugan et al, 2002) and long Calypso piston cores. The analysis showed that high excess pore pressures were required to cause the failure and that they probably acted in the context of a layered system with groundwater seepage.…”

Section: Contributions To Submarine Landslide Research From the Strat...mentioning

confidence: 99%

Submarine Mass Movements on Continental Margins

Lee

Locat

Desgagnés

et al. 2007

Continental Margin Sedimentation

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Submarine landslides can be important mechanisms for transporting sediment down sloping seabeds. They occur when stresses acting downslope exceed the available strength of the seabed sediments. Landslides occur preferentially in particular environments, including fjords, active river deltas, submarine canyons, volcanic islands and, to a lesser extent, the open continental slope. Evaluating the relative stability of different seabeds requires an understanding of driving stresses and sediment strength. Stresses can be caused by gravity, earthquakes and storm waves. Resisting strength can be reduced by pore water and gas pressures, groundwater seepage, rapid sediment deposition, cyclic loading and human activity. Once slopes have become unstable or have failed, strength may continue to decrease, leading to sediment debris flows and possibly turbidity currents. Recent submarine landslide research has: shown that landslides and sediment waves may generate similar deposits, which require careful interpretation; expanded our knowledge of how strength develops in marine sediment; improved techniques for predicting sediment rheology; and developed methodologies for mapping and predicting the medium-to large-scale regional occurrence of submarine landslides.

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Stability Analysis of the Hudson Apron Slope, Off New Jersey, U.S.A.

Cited by 4 publications

References 16 publications

Submarine mass movements on glaciated and non-glaciated European continental margins: A review of triggering mechanisms and preconditions to failure

Submarine mass movements on glaciated and non-glaciated European continental margins: A review of triggering mechanisms and preconditions to failure

Offshore sediment overpressures of passive margins: Mechanisms, measurement, and models

Submarine Mass Movements on Continental Margins

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