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Ai, Fei; Förster, Annika; Stegmann, Sylvia; Kopf, Achim J (2014): Slope stability analyses based on sediment cores of the Ligurian Margin, Southern France. PANGAEA, https://doi.org/10.1594/PANGAEA.837975, Supplement to: Ai, F et al. (2014): Geotechnical Characteristics and Slope Stability Analysis on the Deeper Slope of the Ligurian Margin, Southern France. In: Kyoji Sassa, Paolo Canuti, Yueping Yin (eds.), Landslide Science for a Safer Geoenvironment, Volume 3: Targeted Landslides. Springer International Publishing AG, Switzerland, 549-555, https://doi.org/10.1007/978-3-319-04996-0_84

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Abstract:
Submarine slope failures of various types and sizes are common along the tectonic and seismically active Ligurian margin, northwestern Mediterranean Sea, primarily because of seismicity up to ~M6, rapid sediment deposition in the Var fluvial system, and steepness of the continental slope (average 11°). We present geophysical, sedimentological and geotechnical results of two distinct slides in water depth >1,500 m: one located on the flank of the Upper Var Valley called Western Slide (WS), another located at the base of continental slope called Eastern Slide (ES). WS is a superficial slide characterized by a slope angle of ~4.6° and shallow scar (~30 m) whereas ES is a deep-seated slide with a lower slope angle (~3°) and deep scar (~100 m). Both areas mainly comprise clayey silt with intermediate plasticity, low water content (30-75 %) and underconsolidation to strong overconsolidation. Upslope undeformed sediments have low undrained shear strength (0-20 kPa) increasing gradually with depth, whereas an abrupt increase in strength up to 200 kPa occurs at a depth of ~3.6 m in the headwall of WS and ~1.0 m in the headwall of ES. These boundaries are interpreted as earlier failure planes that have been covered by hemipelagite or talus from upslope after landslide emplacement.
Infinite slope stability analyses indicate both sites are stable under static conditions; however, slope failure may occur in undrained earthquake condition. Peak earthquake acceleration from 0.09 g on WS and 0.12 g on ES, i.e. M5-5.3 earthquakes on the spot, would be required to induce slope instability. Different failure styles include rapid sedimentation on steep canyon flanks with undercutting causing superficial slides in the west and an earthquake on the adjacent Marcel fault to trigger a deep-seated slide in the east.
Coverage:
Median Latitude: 43.528531 * Median Longitude: 7.386983 * South-bound Latitude: 43.510833 * West-bound Longitude: 7.351833 * North-bound Latitude: 43.541167 * East-bound Longitude: 7.436667
Date/Time Start: 2007-08-03T08:09:00 * Date/Time End: 2007-08-07T07:57:00
Size:
20 datasets

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Datasets listed in this publication series

  1. Ai, F; Förster, A; Stegmann, S et al. (2014): (Figure 3) Physical properties and water content of sediment core GeoB12044-2, Western Slide. https://doi.org/10.1594/PANGAEA.837945
  2. Ai, F; Förster, A; Stegmann, S et al. (2014): (Figure 3) Physical properties and water content of sediment core GeoB12045-2, Western Slide. https://doi.org/10.1594/PANGAEA.837946
  3. Ai, F; Förster, A; Stegmann, S et al. (2014): (Figure 3) Physical properties and water content of sediment core GeoB12048, Western Slide. https://doi.org/10.1594/PANGAEA.837947
  4. Ai, F; Förster, A; Stegmann, S et al. (2014): (Figure 3) Physical properties and water content of sediment core GeoB12053, Eastern slide. https://doi.org/10.1594/PANGAEA.837937
  5. Ai, F; Förster, A; Stegmann, S et al. (2014): (Figure 3) Physical properties and water content of sediment core GeoB12060, Eastern slide. https://doi.org/10.1594/PANGAEA.837932
  6. Ai, F; Förster, A; Stegmann, S et al. (2014): (Figure 3) Physical properties and water content of sediment core GeoB12064. https://doi.org/10.1594/PANGAEA.837153
  7. Ai, F; Förster, A; Stegmann, S et al. (2014): (Figure 3) Undrained shear strength of sediment core GeoB12044-2, Western Slide. https://doi.org/10.1594/PANGAEA.837948
  8. Ai, F; Förster, A; Stegmann, S et al. (2014): (Figure 3) Undrained shear strength of sediment core GeoB12045-2, Western Slide. https://doi.org/10.1594/PANGAEA.837949
  9. Ai, F; Förster, A; Stegmann, S et al. (2014): (Figure 3) Undrained shear strength of sediment core GeoB12048, Western Slide. https://doi.org/10.1594/PANGAEA.837950
  10. Ai, F; Förster, A; Stegmann, S et al. (2014): (Figure 3) Undrained shear strength of sediment core GeoB12053, Eastern slide. https://doi.org/10.1594/PANGAEA.837938
  11. Ai, F; Förster, A; Stegmann, S et al. (2014): (Figure 3) Undrained shear strength of sediment core GeoB12060, Eastern slide. https://doi.org/10.1594/PANGAEA.837933
  12. Ai, F; Förster, A; Stegmann, S et al. (2014): (Figure 3) Undrained shear stress (vane shear) of sediment core GeoB12064. https://doi.org/10.1594/PANGAEA.837303
  13. Ai, F; Förster, A; Stegmann, S et al. (2014): (Figure 3) Undrained shear stress of sediment core GeoB12044-2, Western Slide. https://doi.org/10.1594/PANGAEA.837952
  14. Ai, F; Förster, A; Stegmann, S et al. (2014): (Figure 3) Undrained shear stress of sediment core GeoB12045-2, Western Slide. https://doi.org/10.1594/PANGAEA.837956
  15. Ai, F; Förster, A; Stegmann, S et al. (2014): (Figure 3) Undrained shear stress of sediment core GeoB12048, Western Slide. https://doi.org/10.1594/PANGAEA.837974
  16. Ai, F; Förster, A; Stegmann, S et al. (2014): (Figure 3) Undrained shear stress of sediment core GeoB12053, Eastern slide. https://doi.org/10.1594/PANGAEA.837939
  17. Ai, F; Förster, A; Stegmann, S et al. (2014): (Figure 3) Undrained shear stress of sediment core GeoB12060, Eastern slide. https://doi.org/10.1594/PANGAEA.837936
  18. Ai, F; Förster, A; Stegmann, S et al. (2014): (Figure 3) Undrained shear stress of sediment core GeoB12064. https://doi.org/10.1594/PANGAEA.837309
  19. Ai, F; Förster, A; Stegmann, S et al. (2014): (Figure 4) Oedometer tests of METEOR cruise M73/1 sediment cores from the Ligurian Basin. https://doi.org/10.1594/PANGAEA.836921
  20. Ai, F; Förster, A; Stegmann, S et al. (2014): (Figure 5) Drained direct shear tests of METEOR cruise M73/1 sediment cores from the Ligurian Basin. https://doi.org/10.1594/PANGAEA.836952