Mass wasting along the NW African continental margin

Sebastian Krastel, Wei Li, Morelia Urlaub, Aggeliki Georgiopoulou, Russell Wynn, Tilmann Schwenk, Christopher Stevenson, Peter Feldens

Research output: Chapter in Book/Conference proceeding with ISSN or ISBNConference contribution with ISSN or ISBNResearchpeer-review

Abstract

The NW African continental margin is well known for the occurrence of large-scale but infrequent submarine landslides. The aim of this paper is to synthesize the current knowledge on submarine mass wasting off NW Africa with a special focus on the distribution and timing of large landslides. The described area reaches from southern Senegal to the Agadir Canyon. The largest landslides from south to north are the Dakar Slide, the Mauritania Slide, the Cap Blanc Slide, the Sahara Slide and the Agadir Slide. Volumes of individual slides reach several hundreds of cubic kilometres; run-outs are up to 900 km. In addition, giant volcanic debris avalanches are widespread on the flanks of the Canary Islands. All headwall areas are complex with clear indications of multiple failures. The most prominent similarity between all investigated landsides is the existence of widespread glide planes that follow the stratigraphy, which points to weak layers as most important preconditioning factor for the failures. Landslides with volumes larger than 100 m3 are close to being evenly distributed over time, contradicting previous suggestions that landslides off NW Africa occur at periods of low or rising sea level. The risk associated with the landslides off NW Africa, however, is relatively low due to their long recurrence rates.
Original languageEnglish
Title of host publicationSubaqueous mass movements
EditorsGwyn Lintern, David Mosher, Lorena Moscardelli, Peter Bobrowsky, C Campbell, Jason Chaytor, JJ Clague, Aggeliki Georgiopoulou, P Lajeunesse, Alexandre Normandeau, David Piper, M Scherwath, Cooper Stacey, Dominic Turmel
PublisherGeological Society of London
Volume477
DOIs
Publication statusPublished - 23 May 2018

Publication series

NameSpecial Publications
PublisherGeological Society of London
Volume477
ISSN (Print)0305-8719
ISSN (Electronic)2041-4927

Fingerprint

mass wasting
continental margin
landslide
submarine landslide
debris avalanche
canyon
stratigraphy
Africa

Cite this

Krastel, S., Li, W., Urlaub, M., Georgiopoulou, A., Wynn, R., Schwenk, T., ... Feldens, P. (2018). Mass wasting along the NW African continental margin. In G. Lintern, D. Mosher, L. Moscardelli, P. Bobrowsky, C. Campbell, J. Chaytor, JJ. Clague, A. Georgiopoulou, P. Lajeunesse, A. Normandeau, D. Piper, M. Scherwath, C. Stacey, ... D. Turmel (Eds.), Subaqueous mass movements (Vol. 477). (Special Publications; Vol. 477). Geological Society of London. https://doi.org/10.1144/SP477.36
Krastel, Sebastian ; Li, Wei ; Urlaub, Morelia ; Georgiopoulou, Aggeliki ; Wynn, Russell ; Schwenk, Tilmann ; Stevenson, Christopher ; Feldens, Peter. / Mass wasting along the NW African continental margin. Subaqueous mass movements. editor / Gwyn Lintern ; David Mosher ; Lorena Moscardelli ; Peter Bobrowsky ; C Campbell ; Jason Chaytor ; JJ Clague ; Aggeliki Georgiopoulou ; P Lajeunesse ; Alexandre Normandeau ; David Piper ; M Scherwath ; Cooper Stacey ; Dominic Turmel. Vol. 477 Geological Society of London, 2018. (Special Publications).
@inproceedings{eeb210d7ca0e4f0797757b9c06b7d53d,
title = "Mass wasting along the NW African continental margin",
abstract = "The NW African continental margin is well known for the occurrence of large-scale but infrequent submarine landslides. The aim of this paper is to synthesize the current knowledge on submarine mass wasting off NW Africa with a special focus on the distribution and timing of large landslides. The described area reaches from southern Senegal to the Agadir Canyon. The largest landslides from south to north are the Dakar Slide, the Mauritania Slide, the Cap Blanc Slide, the Sahara Slide and the Agadir Slide. Volumes of individual slides reach several hundreds of cubic kilometres; run-outs are up to 900 km. In addition, giant volcanic debris avalanches are widespread on the flanks of the Canary Islands. All headwall areas are complex with clear indications of multiple failures. The most prominent similarity between all investigated landsides is the existence of widespread glide planes that follow the stratigraphy, which points to weak layers as most important preconditioning factor for the failures. Landslides with volumes larger than 100 m3 are close to being evenly distributed over time, contradicting previous suggestions that landslides off NW Africa occur at periods of low or rising sea level. The risk associated with the landslides off NW Africa, however, is relatively low due to their long recurrence rates.",
author = "Sebastian Krastel and Wei Li and Morelia Urlaub and Aggeliki Georgiopoulou and Russell Wynn and Tilmann Schwenk and Christopher Stevenson and Peter Feldens",
year = "2018",
month = "5",
day = "23",
doi = "10.1144/SP477.36",
language = "English",
volume = "477",
series = "Special Publications",
publisher = "Geological Society of London",
editor = "Gwyn Lintern and David Mosher and Lorena Moscardelli and Peter Bobrowsky and C Campbell and Jason Chaytor and JJ Clague and Aggeliki Georgiopoulou and P Lajeunesse and Alexandre Normandeau and David Piper and M Scherwath and Cooper Stacey and Dominic Turmel",
booktitle = "Subaqueous mass movements",

}

Krastel, S, Li, W, Urlaub, M, Georgiopoulou, A, Wynn, R, Schwenk, T, Stevenson, C & Feldens, P 2018, Mass wasting along the NW African continental margin. in G Lintern, D Mosher, L Moscardelli, P Bobrowsky, C Campbell, J Chaytor, JJ Clague, A Georgiopoulou, P Lajeunesse, A Normandeau, D Piper, M Scherwath, C Stacey & D Turmel (eds), Subaqueous mass movements. vol. 477, Special Publications, vol. 477, Geological Society of London. https://doi.org/10.1144/SP477.36

Mass wasting along the NW African continental margin. / Krastel, Sebastian; Li, Wei; Urlaub, Morelia; Georgiopoulou, Aggeliki; Wynn, Russell; Schwenk, Tilmann; Stevenson, Christopher; Feldens, Peter.

Subaqueous mass movements. ed. / Gwyn Lintern; David Mosher; Lorena Moscardelli; Peter Bobrowsky; C Campbell; Jason Chaytor; JJ Clague; Aggeliki Georgiopoulou; P Lajeunesse; Alexandre Normandeau; David Piper; M Scherwath; Cooper Stacey; Dominic Turmel. Vol. 477 Geological Society of London, 2018. (Special Publications; Vol. 477).

Research output: Chapter in Book/Conference proceeding with ISSN or ISBNConference contribution with ISSN or ISBNResearchpeer-review

TY - GEN

T1 - Mass wasting along the NW African continental margin

AU - Krastel, Sebastian

AU - Li, Wei

AU - Urlaub, Morelia

AU - Georgiopoulou, Aggeliki

AU - Wynn, Russell

AU - Schwenk, Tilmann

AU - Stevenson, Christopher

AU - Feldens, Peter

PY - 2018/5/23

Y1 - 2018/5/23

N2 - The NW African continental margin is well known for the occurrence of large-scale but infrequent submarine landslides. The aim of this paper is to synthesize the current knowledge on submarine mass wasting off NW Africa with a special focus on the distribution and timing of large landslides. The described area reaches from southern Senegal to the Agadir Canyon. The largest landslides from south to north are the Dakar Slide, the Mauritania Slide, the Cap Blanc Slide, the Sahara Slide and the Agadir Slide. Volumes of individual slides reach several hundreds of cubic kilometres; run-outs are up to 900 km. In addition, giant volcanic debris avalanches are widespread on the flanks of the Canary Islands. All headwall areas are complex with clear indications of multiple failures. The most prominent similarity between all investigated landsides is the existence of widespread glide planes that follow the stratigraphy, which points to weak layers as most important preconditioning factor for the failures. Landslides with volumes larger than 100 m3 are close to being evenly distributed over time, contradicting previous suggestions that landslides off NW Africa occur at periods of low or rising sea level. The risk associated with the landslides off NW Africa, however, is relatively low due to their long recurrence rates.

AB - The NW African continental margin is well known for the occurrence of large-scale but infrequent submarine landslides. The aim of this paper is to synthesize the current knowledge on submarine mass wasting off NW Africa with a special focus on the distribution and timing of large landslides. The described area reaches from southern Senegal to the Agadir Canyon. The largest landslides from south to north are the Dakar Slide, the Mauritania Slide, the Cap Blanc Slide, the Sahara Slide and the Agadir Slide. Volumes of individual slides reach several hundreds of cubic kilometres; run-outs are up to 900 km. In addition, giant volcanic debris avalanches are widespread on the flanks of the Canary Islands. All headwall areas are complex with clear indications of multiple failures. The most prominent similarity between all investigated landsides is the existence of widespread glide planes that follow the stratigraphy, which points to weak layers as most important preconditioning factor for the failures. Landslides with volumes larger than 100 m3 are close to being evenly distributed over time, contradicting previous suggestions that landslides off NW Africa occur at periods of low or rising sea level. The risk associated with the landslides off NW Africa, however, is relatively low due to their long recurrence rates.

U2 - 10.1144/SP477.36

DO - 10.1144/SP477.36

M3 - Conference contribution with ISSN or ISBN

VL - 477

T3 - Special Publications

BT - Subaqueous mass movements

A2 - Lintern, Gwyn

A2 - Mosher, David

A2 - Moscardelli, Lorena

A2 - Bobrowsky, Peter

A2 - Campbell, C

A2 - Chaytor, Jason

A2 - Clague, JJ

A2 - Georgiopoulou, Aggeliki

A2 - Lajeunesse, P

A2 - Normandeau, Alexandre

A2 - Piper, David

A2 - Scherwath, M

A2 - Stacey, Cooper

A2 - Turmel, Dominic

PB - Geological Society of London

ER -

Krastel S, Li W, Urlaub M, Georgiopoulou A, Wynn R, Schwenk T et al. Mass wasting along the NW African continental margin. In Lintern G, Mosher D, Moscardelli L, Bobrowsky P, Campbell C, Chaytor J, Clague JJ, Georgiopoulou A, Lajeunesse P, Normandeau A, Piper D, Scherwath M, Stacey C, Turmel D, editors, Subaqueous mass movements. Vol. 477. Geological Society of London. 2018. (Special Publications). https://doi.org/10.1144/SP477.36