The anatomy of a large submarine slump on a sheared continental margin (SE Africa)

Dingle, R. V.

doi:10.1144/gsjgs.134.3.0293

Cited by 130 publications

(72 citation statements)

References 12 publications

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“…1) (Dingle, 1977). According to Dingle's (1977) studies, this Agulhas Slump is 750 km long and 106 km wide, with a volume of over 20,000 km 3 .…”

Section: Geological Backgroundmentioning

confidence: 99%

“…1) (Dingle, 1977). According to Dingle's (1977) studies, this Agulhas Slump is 750 km long and 106 km wide, with a volume of over 20,000 km 3 . It is a composite feature consisting of proximal and distal allochthonous sediment masses separated by a large glide plane scar (Dingle, 1977).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…According to Dingle's (1977) studies, this Agulhas Slump is 750 km long and 106 km wide, with a volume of over 20,000 km 3 . It is a composite feature consisting of proximal and distal allochthonous sediment masses separated by a large glide plane scar (Dingle, 1977). The head region is located in water depths of 190-700 m, while the toe region extends into the deep sea (Dingle, 1977).…”

Section: Geological Backgroundmentioning

confidence: 99%

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Sedimentary deposits on the southern South African continental margin: Slumping versus non-deposition or erosion by oceanic currents?

Uenzelmann-Neben¹,

Huhn²

2009

Marine Geology

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Seismic profiles extending from the southern South African shelf into the deep sea reveal a strong erosional activity, which affects large parts of the continental margin. Quaternary to Oligocene units and, in places, the complete sedimentary column appear to have been removed. Mass movements were previously considered as the origin of this erosion. However, structures indicating slumping can be identified in only a few places. The erosional activity is confined to specific water depths, which correlate well with the activity levels of water masses observed here. We thus suggest that the Agulhas Current, Antarctic Intermediate Water, North Atlantic Deep Water, and Antarctic Bottom Water have intensively shaped the sedimentary units over a long period. This indicates a stable circulation comparable to that at present day since the Neogene.

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“…1) (Dingle, 1977). According to Dingle's (1977) studies, this Agulhas Slump is 750 km long and 106 km wide, with a volume of over 20,000 km 3 .…”

Section: Geological Backgroundmentioning

confidence: 99%

Section: Geological Backgroundmentioning

confidence: 99%

Section: Geological Backgroundmentioning

confidence: 99%

See 1 more Smart Citation

Sedimentary deposits on the southern South African continental margin: Slumping versus non-deposition or erosion by oceanic currents?

Uenzelmann-Neben¹,

Huhn²

2009

Marine Geology

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“…Again the SMF is poorly dated (Ashabranner et al 2009). Off southern Africa, the Agulhas Slump has a proposed volume of 20 000 km 3 , although this figure is based on single-beam bathymetry data (Dingle 1977).…”

Section: (Iii) Non-glaciated Marginsmentioning

confidence: 99%

Submarine mass failures as tsunami sources: their climate control

Tappin

2010

Phil. Trans. R. Soc. A.

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Recent research on submarine mass failures (SMFs) shows that they are a source of hazardous tsunamis, with the tsunami magnitude mainly dependent on water depth of failure, SMF volume and failure mechanism, cohesive slump or fragmental landslide. A major control on the mechanism of SMFs is the sediment type, together with its post-depositional alteration. The type of sediment, fine- or coarse-grained, its rate of deposition together with post-depositional processes may all be influenced by climate. Post-depositional processes, termed sediment ‘preconditioning’, are known to promote instability and failure. Climate may also control the triggering of SMFs, for example through earthquake loading or cyclic loading from storm waves or tides. Instantaneous triggering by other mechanisms such as fluid overpressuring and hydrate instability is controversial, but is here considered unlikely. However, these mechanisms are known to promote sediment instability. SMFs occur in numerous environments, including the open continental shelf, submarine canyon/fan systems, fjords, active river deltas and convergent margins. In all these environments there is a latitudinal variation in the scale of SMFs. The database is limited, but the greatest climate influence appears to be in high latitudes where glacial/interglacial cyclicity has considerable control on sedimentation, preconditioning and triggering. Consideration of the different types of SMFs in the context of their climate controls provides additional insight into their potential hazard in sourcing tsunamis. For example, in the Atlantic, where SMFs are common, the tsunami hazard under the present-day climate may not be as great as their common occurrence suggests.

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“…Off of North Africa there are five or six large submarine landslides, including the giant Saharan debris flow. In the south Atlantic, submarine landslides lie off the Amazon Delta, with volumes of 2,500 km 3 (Maslin et al 1998); off of southern Africa is the Agulhas Slump with a proposed volume of 20,000 3 km (Dingle 1977) although this figure is based on pre-swath bathymetry data. Yet, of all these landslides on the margins of the Atlantic, that must be several hundred in number, the only direct evidence of any tsunamis associated with their failure, is from Storrega where there sedimentary deposits (Bondevik et al 2005)and the Grand Banks, where there are survivors accounts an sediments (e.g.…”

Section: Open Continental Slope and Risementioning

confidence: 99%

Mass Transport Events and Their Tsunami Hazard

Tappin

2010

Submarine Mass Movements and Their Consequences

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Mass transport events, such as those from submarine landslides, volcanic flank collapse at convergent margins and on oceanic islands, and subaerial failure are reviewed and found to be all potential tsunami sources. The intensity and frequency of the tsunamis resulting is dependent upon the source. Most historical records are of devastating tsunamis from volcanic collapse at convergent margins. Although the database is limited, tsunamis sourced from submarine landslides and from collapse on oceanic volcanoes have a climate influence and may not be as hazardous as their frequency suggests. Conversely, tsunamis sourced from submarine landslides at convergent margins may be more frequent historically than previously recognized and more hazardous.

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The anatomy of a large submarine slump on a sheared continental margin (SE Africa)

Cited by 130 publications

References 12 publications

Sedimentary deposits on the southern South African continental margin: Slumping versus non-deposition or erosion by oceanic currents?

Sedimentary deposits on the southern South African continental margin: Slumping versus non-deposition or erosion by oceanic currents?

Submarine mass failures as tsunami sources: their climate control

Mass Transport Events and Their Tsunami Hazard

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