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Marine Geophysical Research

, Volume 32, Issue 1–2, pp 225–243 | Cite as

Morphology, distribution and origin of recent submarine landslides of the Ligurian Margin (North-western Mediterranean): some insights into geohazard assessment

  • Sébastien MigeonEmail author
  • Antonio Cattaneo
  • Virginie Hassoun
  • Christophe Larroque
  • Nicola Corradi
  • Francesco Fanucci
  • Alexandre Dano
  • Bernard Mercier de Lepinay
  • Françoise Sage
  • Christian Gorini
Original Research Paper

Abstract

Based on new multibeam bathymetric data, seismic-reflection profiles and side-scan sonar images, a great number of submarine failures of various types and sizes was identified along the northern margin of the Ligurian Basin and characterized with 3 distinct end-members concerning their location on the margin, sedimentary processes and possible triggering mechanisms. They include superficial landslides mainly located in the vicinity of the main mountain-supplied rivers and on the inner walls of canyons (typically smaller that 108 m3 in volume: Type 1), deep scars 100–500 m high along the base of the continental slope (Type 2), and large-scale scars and Mass Transport Deposits (MTDs) affecting the upper part of the slope (Type 3 failures). The MTDs are located in different environmental contexts of the margin, including the deep Var Sedimentary Ridge (VSR) and the upper part of the continental slope in the Gulf of Genova (Finale Slide and Portofino Slide), with volumes of missing sediment reaching up to 1.5 × 109 m3. High sedimentation rates related to hyperpycnal flows, faults and earthquake activity, together with sea-level fluctuations are the main factors invoked to explain the distribution and sizes of these different failure types.

Keywords

Ligurian Sea Submarine landslides Seafloor morphology Seismic-reflection profiles Side-scan sonar 

Notes

Acknowledgments

The authors would like to thank the captains and crew of the RV Le Suroît (Ifremer-Genavir) and the RV Téthys II (INSU-CNRS). This work was funded by the French research programs “GDR Marges”, “Reliefs de la Terre” and “Action Marges”. The final version of the manuscript benefited from constructive suggestions and comments by Sam Johnson and an anonymous reviewer.

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Sébastien Migeon
    • 1
    Email author
  • Antonio Cattaneo
    • 2
  • Virginie Hassoun
    • 1
  • Christophe Larroque
    • 3
  • Nicola Corradi
    • 4
  • Francesco Fanucci
    • 5
  • Alexandre Dano
    • 1
  • Bernard Mercier de Lepinay
    • 3
  • Françoise Sage
    • 1
  • Christian Gorini
    • 6
  1. 1.UMR GéoAzurUniversité de Nice-Sophia Antipolis, CNRS, OCAVillefrance/MerFrance
  2. 2.IFREMERPlouzanéFrance
  3. 3.UMR GéoAzurUniversité de Nice-Sophia Antipolis, CNRS, OCAValbonneFrance
  4. 4.University of GenovaGenoaItaly
  5. 5.University of TriesteDiGeItaly
  6. 6.UMR iSTePUniversité Pierre et Marie CurieParis cedex05France

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