Line length balancing to evaluate multi-phase submarine landslide development: an example from the Storegga Slide, Norway

Author:

Bull Suzanne1ORCID,Cartwright Joseph A.2ORCID

Affiliation:

1. GNS Science, 1 Fairway Drive, Avalon, Lower Hutt 5010, New Zealand

2. Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK

Abstract

AbstractThis study shows how simple structural restoration of a discrete submarine landslide lobe can be applied to large-scale, multi-phase examples to identify different phases of slide-lobe development and evaluate their mode of emplacement. We present the most detailed analysis performed to date on a zone of intense contractional deformation, historically referred to as the compression zone, from the giant, multi-phase Storegga Slide, offshore Norway. 2D and 3D seismic data and bathymetry data show that the zone of large-scale (>650 m thick) contractional deformation can be genetically linked updip with a zone of intense depletion across a distance of 135 km. Quantification of depletion and accumulation along a representative dip-section reveals that significant depletion in the proximal region is not accommodated in the relatively mild amount (c. 5%) of downdip shortening. Dip-section restoration indicates a later, separate stage of deformation may have involved removal of a significant volume of material as part of the final stages of the Storegga Slide, as opposed to the minor volumes reported in previous studies.

Publisher

Geological Society of London

Subject

Geology,Ocean Engineering,Water Science and Technology

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