23-25 September 2013
GEOMAR East shore
Europe/Berlin timezone
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Slope instability of glaciated continental margins: Constrains from permeability-compressibility tests and hydrogeological modeling off Storfjorden, NW Barents Sea

Presented by Mr. Jaume LLOPART on 24 Sep 2013 from 10:15 to 10:30
Type: Oral presentation, full-paper
Track: Oral presentations

Content

Climate variations control sediment supply to the continental slope as well as glacial advances and retreats, which (a) cause significant stress changes in the sedimentary column and redistribution of interstitial fluids, (b) induce a particular margin stratigraphic pattern and permeability architecture and (c) are at the origin of isostatic adjustments that may reactivate faults. We test this hypothesis using a combination of geophysical and geotechnical data from the Storfjorden Trough Mouth Fan, off southern Svalbard. The results of compressibility and permeability testing are used together with margin stratigraphic models obtained from seismic reflection data, as input for numerical finite elements models to understand focusing of interstitial fluids in glaciated continental margins and influence on timing and location of submarine slope failure. Available results indicate values of overpressure of 0.23-0.5 (slope-shelf) that persists to present-day. This overpressure started to develop in response to onset of Pleistocene glaciations and reduced by half the factor of safety of the continental slope.

Place

Location: GEOMAR East shore
Address: Wischhofstr. 1-3 / D-24148 Kiel
Room: Lecture Hall Geb. 8A

Primary authors

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Co-authors

  • Dr. Roger URGELES Institute of Marine Sciences (CSIC)
  • A. CAMERLENGHI Geophysics Research Section, Istituto Nazionale di Oceanografia e Geofisica Sperimentale-OGS, Trieste, Italy
  • R. G. LUCCHI Geophysics Research Section, Istituto Nazionale di Oceanografia e Geofisica Sperimentale-OGS, Trieste, Italy
  • B. DE MOL Dept. Geoci`encies Marines, Institut de Ci`encies del Mar (CSIC), Barcelona, Spain
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