Large-scale mass wasting on the northwest African continental margin: Some general implications for mass wasting on passive continental margins

Sebastian Krastel, Russell B. Wynn, Aggeliki Georgiopoulou, Jacob Geersen, Rüdiger Henrich, Mathias Meyer, Tilmann Schwenk

Research output: Chapter in Book/Conference proceeding with ISSN or ISBNConference contribution with ISSN or ISBN

Abstract

The continental margin off Northwest Africa is shaped by a complex interplay of sediment transport processes, directed both downslope and alongslope. During several recent cruises, sediment transport processes between 12°N and 29°N off Senegal, Mauritania, and Western Sahara were investigated by means of geophysical and sedimentological methods. Sediment transport on the Northwest African continental margin operates with different rates and styles: some sections of the margin show a large concentration of upper slope canyons but no indication for significant mass wasting, whereas other sections are characterized by large-scale mass wasting with no canyons or gullies. Four mega-slides, each affecting over 20,000 km2 of seafloor, have been identified along the continental slope off Northwest Africa. All slides are complex in morphology and show a stepped headwall pattern typical for retrogressive failure. Several buried mass transport deposits are seismically imaged beneath all near-surface slides indicating a long history of mass wasting for some sections of the margin. Two of the mega-slides show headwalls at atypically large water depths, deeper than 3,000 m.

Original languageEnglish
Title of host publicationSubmarine Mass Movements and Their Consequences - 5th International Symposium
PublisherKluwer Academic Publishers
Pages189-199
Number of pages11
ISBN (Print)9789400721616
DOIs
Publication statusPublished - 1 Jan 2012
Event5th International Symposium on Submarine Mass Movements and Their Consequences - Kyoto, Japan
Duration: 24 Oct 201126 Oct 2011

Publication series

NameSubmarine Mass Movements and Their Consequences - 5th International Symposium

Conference

Conference5th International Symposium on Submarine Mass Movements and Their Consequences
CountryJapan
CityKyoto
Period24/10/1126/10/11

Keywords

  • Acoustic imaging
  • Canyons
  • Geohazards
  • Submarine landslides

Fingerprint Dive into the research topics of 'Large-scale mass wasting on the northwest African continental margin: Some general implications for mass wasting on passive continental margins'. Together they form a unique fingerprint.

  • Cite this

    Krastel, S., Wynn, R. B., Georgiopoulou, A., Geersen, J., Henrich, R., Meyer, M., & Schwenk, T. (2012). Large-scale mass wasting on the northwest African continental margin: Some general implications for mass wasting on passive continental margins. In Submarine Mass Movements and Their Consequences - 5th International Symposium (pp. 189-199). (Submarine Mass Movements and Their Consequences - 5th International Symposium). Kluwer Academic Publishers. https://doi.org/10.1007/978-94-007-2162-3_17