Submarine slide initiation and evolution offshore Pointe Odden, Gabon — Analysis from annual bathymetric data (2004–2009)

Biscara, Laurie; Hanquiez, Vincent; Leynaud, D.; Marieu, Vincent; Mulder, Thierry; Gallissaires, J.-M.; Crespin, Jean-Pierre; Braccini, E.; Garlan, Thierry

doi:10.1016/j.margeo.2011.11.008

Cited by 28 publications

(18 citation statements)

References 21 publications

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“…2c). There is no evidence for submarine erosion close to the slide but bottom currents may have led to repeated failure owing to over-steepening of the slope and enhanced deposition (Biscara et al 2012). Haflidason et al (2004) and Bryn et al (2005b) showed that current velocities peaked for water depths in which the Storegga Slide was probably initiated.…”

Section: Resultsmentioning

confidence: 99%

The Fram Slide off Svalbard: a submarine landslide on a low-sedimentation-rate glacial continental margin

Elger

Berndt

Krastel

et al. 2014

JGS

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Submarine slope failures are a widespread, hazardous phenomenon on continental margins. The prevailing opinion links large submarine landslides along the glaciated NW European continental margins to overpressure generated by the alternation of rapidly deposited glacigenic and hemipelagic material. Here, we report a newly discovered large landslide complex off NW Svalbard. It differs from all known large slides off NW Europe, as the available data rule out that this slope failure resulted from rapid glacigenic deposition. This suggests that processes such as contour currents, tectonic faulting, and overpressure build-up related to the gas hydrate system must be considered for hazard assessment.

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Section: Resultsmentioning

confidence: 99%

The Fram Slide off Svalbard: a submarine landslide on a low-sedimentation-rate glacial continental margin

Elger

Berndt

Krastel

et al. 2014

JGS

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“…At a global scale, top-down processes generally occur in moderate to high sediment-supply margins, alimented by coastal and fluvial sedimentary inputs, and are more frequent and active during the glacial phases (Canals et al, 2000;Baztan et al, 2005;Harris and Whiteway, 2011). Bottom-up processes are governed by the development of stacked mass-movements retrograding through the lower slope to the shelf margin and are more commonly observed in sediment-undersupplied margins, in tectonically active high-gradient bedrock slopes (Lo Iacono et al, 2011;Biscara et al, 2012;Micallef et al, 2012). Commonly, both of these mechanisms contribute to canyon shaping and development, with top-down turbidity processes producing axial incision from the shelf, and bottom-up retrograding landslides widening the canyons and producing downslope debris flows (Pratson and Coakley, 1996;Lo Iacono et al, 2011 in controlling the evolution and the morphology of submarine canyons, above all along continental margins affected by tilting and vertical movements (Mountjoy et al, 2009;Ratzov et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Submarine canyons of north-western Sicily (Southern Tyrrhenian Sea): Variability in morphology, sedimentary processes and evolution on a tectonically active margin

Iacono

Sulli

Agate

2014

Deep Sea Research Part II: Topical Studies in Oceanography

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a b s t r a c tSwath-bathymetry, mono-channel and multi-channel seismic reflection records acquired during the last two decades on the northern Sicilian margin have unveiled a dense network of submarine canyons within the depth range of 80-2100 m. The canyons display a relevant variability in their geometry, morphology and sedimentary processes. The margin shows a young, tectonically active shelf to slope setting, linking the Sicilian-Maghrebian Thrust Belt to the Tyrrhenian oceanic realm, developed during the Neogene-Quaternary time span. The aim of this study is to highlight the main governing factors that contributed to the evolution and differentiation of the northern Sicilian canyons, mainly focusing on the Gulf of Palermo and on the Gulf of Castellammare. Tectonic control is more evident in the canyons of the Gulf of Palermo, with submarine landslides retrograding on a steep slope and mainly controlling their evolution. Otherwise, canyons, tributaries and gullies mapped in the Gulf of Castellammare developed on a less steep substrate and display sinuous to meandering paths, with a relevant role of coastal/shelf sedimentary inputs and downslope turbidity processes in their formation. Results suggest that, despite the geographically close proximity of the two study areas, the different structural settings of the Castellammare and Palermo Basins are mainly responsible for canyon variability. Data indicate likely ongoing uplift and tilting movements along the Sicilian margin, influencing the development of the studied canyons, which have probably been more active during the Quaternary glacial maxima than they are in the present day.

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“…The relief and structure of the tip slope is varied and mainly related to the development of surface mass movements (Rucińska 2015; Rudowski et al 2016) commonly reported in the areas of the continental slope (inter alia Hampton et al 1996;McAdoo et al 2000;Canals et al 2004;Baeten et al 2013), underwater slopes of volcanic, tectonic and glacial lakes (inter alia Gardner et al 2000;Strupler et al 2017), and of large river deltas (inter alia Prior & Suhayda 1979;Nemec 1990;Biscara et al 2012). The inventory and nature of these forms is very similar, although of course the scale as well as the structure of the slope is different.…”

Section: Discussionmentioning

confidence: 99%

Seismic architecture of the tip of the Hel Peninsula, Poland

Rucińska-Zjadacz¹,

Rudowski²,

Wróblewski³

2018

Baltica

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The article presents results of a pioneering research on the main geological features of the Hel Peninsula based on the analysis of seismic profiles and their comparison with geological cross-sections made on the basis of drillings. The following three parts of the tip structure have been identified: barrier basement (1), barrier core (2) and barrier upper part (3). Seismic facies distinguished therein were subsequently geologically interpreted as follows: Cretaceous marl and limestone (1.1), glacial till and diamicton (1.2), silt and clay of limnoglacial/limnic/marine origin (1.3), barrier sand of the core (2), and sand and peat of the barrier upper part (3). Geological cross-sections covering the geological structure of the tip of the Hel Peninsula underwater slope and the surrounding seabed. The slope base and the distal sand colluvium extent on the seafloor were determined. This paper is the first to present a crosswise section in this part of the Hel Peninsula.

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Submarine slide initiation and evolution offshore Pointe Odden, Gabon — Analysis from annual bathymetric data (2004–2009)

Cited by 28 publications

References 21 publications

The Fram Slide off Svalbard: a submarine landslide on a low-sedimentation-rate glacial continental margin

The Fram Slide off Svalbard: a submarine landslide on a low-sedimentation-rate glacial continental margin

Submarine canyons of north-western Sicily (Southern Tyrrhenian Sea): Variability in morphology, sedimentary processes and evolution on a tectonically active margin

Seismic architecture of the tip of the Hel Peninsula, Poland

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