The morphology, setting and processes of the Afen Slide

Wilson, Christian; Long, David S.; Bulat, J.

doi:10.1016/j.margeo.2004.10.005

Cited by 54 publications

(45 citation statements)

References 22 publications

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“…The cores taken from inside the slide area show much greater variability than those from the undisturbed sediments outside the slide ( Fig. 8) (also Wilson et al, 2004). The variability of the disturbed material may be explained by the chaotic nature of deposition with individual clasts in various states of over or under-consolidation present within the matrix of reworked material from the debris flow.…”

Section: Geotechnical Measurementsmentioning

confidence: 95%

Triggering mechanisms of slope instability processes and sediment failures on continental margins: a geotechnical approach

et al. 2004

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The Costa target areas exhibit the variability of slope instabilities needed to improve our understanding of sediment physical and mechanical properties in areas prone to sliding. That is why in this project, we have analysed the different slope failures events from different parts of the Costa target areas, which reflect diverse triggering mechanisms. The aim of the first part of this study was to identify the geotechnical response of the sediment to different external mechanisms (earthquake, rapid sedimentation and gas hydrate melting). We have focused on the relation between external mechanisms and the consequence change in the in-situ stress state and the physical, mechanical, and elastic properties of the sediment.In the second part of the paper, the geotechnical properties of the sediment from different Costa areas are presented. Comparison between observed geotechnical properties and the theoretical behaviour was done in order to improve our understanding of the origin of the different observed slides. D

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Section: Geotechnical Measurementsmentioning

confidence: 95%

Triggering mechanisms of slope instability processes and sediment failures on continental margins: a geotechnical approach

et al. 2004

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“…in Owen et al, 2007;673 Lee, 2009). The Canadian abyssal plain turbidites (Grantz et al, 1996), Afen 674 slide (Wilson et al, 2004), Rockall bank slump (Flood et al, 1979) and north 675 tent 14 C dates. Landslide ages inferred from sediment thickness and nearby 677 sedimentation rates, such as for the Andøya slide (Laberg et al, 2000), Peach 678 2 and 3 debris flows (Holmes et al, 1998), Currituck slide (Prior et al, 1986) 679 and Amazon shallow E debris flow (Maslin et al, 2005), were omitted as well.…”

mentioning

confidence: 99%

Timing and frequency of large submarine landslides: implications for understanding triggers and future geohazard

Urlaub¹,

Talling²,

Masson³

2013

Quaternary Science Reviews

168

164

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Large submarine landslides can have serious socioeconomic consequences as they have the potential to cause tsunamis and damage seabed infrastructure. It is important to understand the frequency of these landslides, and how that frequency is related to climate-driven factors such as sea level or sedimentation rate, in order to assess their occurrence in the future. Recent studies have proposed that more landslides occur during periods of sea level rise and lowstand, or during periods of rapid sedimentation. In this contribution we test these hypotheses by analysing the most comprehensive global data set of ages for large (> 1km 3 ) late Quaternary submarine landslides that has been compiled to date. We include the uncertainties in each landslide age that arise from both the dating technique, and the typically larger uncertainties that result from the position of the samples used for dating. Contrary to the hypothesis that continental slope stability is linked to sea level change, the data set does not show statistically significant patterns, trends or clusters in landslide abundance. If such a link between sea level and landslide frequency exists it is too weak to be detected using the available global data base. It is possible that controlling factors vary between different geographical areas, and their role is therefore hidden * Corresponding author Email address: m.urlaub@noc.soton.ac.uk (Morelia Urlaub)Preprint submitted to Elsevier March 1, 2013in a global data set, or that the uncertainties within the dates is too great to see an underlying correlation. Our analysis also shows that there is no evidence for an immediate influence of rapid sedimentation on slope stability as failures tend to occur several thousand years after periods of increased sedimentation rates. The results imply that there is not a strong global correlation of landslide frequency with sea level changes or increases in local sedimentation rate, based on the currently available ages for large submarine landslides.

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“…Discrepancies between 234 Th fluxes and those expected from in situ 238 U decay within the bottom mixed layer are evidence for stripping of 234 Th by resuspended sediments [296]. The effect is greater in abyssal areas of the Atlantic Ocean, where tidal currents are stronger [295] than in the abyssal Mediterranean [293].…”

Section: (G) Pelagic Sedimentationmentioning

confidence: 88%

Aspects of marine geoscience: a review and thoughts on potential for observing active processes and progress through collaboration between the ocean sciences

Mitchell

2012

Phil. Trans. R. Soc. A.

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Much progress has been made in the UK in characterizing the internal structures of major physiographic features in the oceans and in developing understanding of the geological processes that have created or shaped them. UK researchers have authored articles of high impact in all areas described here. In contrast to terrestrial geoscience, however, there have been few instrumented observations made of active processes by UK scientists. This is an area that could be developed over the next decades in the UK. Research on active processes has the potential ability to engage the wider public: Some active processes present significant geo-hazards to populations and offshore infrastructure that require monitoring and there could be commercial applications of technological developments needed for science. Some of the suggestions could involve studies in shallow coastal waters where ship costs are much reduced, addressing tighter funding constraints over the near term. The possibilities of measuring aspects of volcanic eruptions, flowing lava, turbidity currents and mass movements (landslides) are discussed. A further area of potential development is in greater collaboration between the ocean sciences. For example, it is well known in terrestrial geomorphology that biological agents are important in modulating erosion and the transport of sediments, ultimately affecting the shape of the Earth's surface in various ways. The analogous effect of biology on large-scale geomorphology in the oceans is also known but remains poorly quantified. Physical oceanographic models are becoming increasingly accurate and could be used to study further the patterns of erosion, particle transport and deposition in the oceans. Marine geological and geophysical data could in turn be useful for further verification of such models. Adapting them to conditions of past oceans could address the shorter-period movements, such as due to internal waves and tides, which have been barely addressed in palaeoceanography.

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The morphology, setting and processes of the Afen Slide

Cited by 54 publications

References 22 publications

Triggering mechanisms of slope instability processes and sediment failures on continental margins: a geotechnical approach

Triggering mechanisms of slope instability processes and sediment failures on continental margins: a geotechnical approach

Timing and frequency of large submarine landslides: implications for understanding triggers and future geohazard

Aspects of marine geoscience: a review and thoughts on potential for observing active processes and progress through collaboration between the ocean sciences

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