Micallef, Aaron , Masson, D. G., Berndt, Christian and Stow, D. A. V. (2016) Submarine spreading in the Storegga Slide, Norwegian Sea. In: Atlas of submarine glacial landforms: modern, Quaternary and ancient. , ed. by Dowdeswell, Julian A., Canals, Miquel, Jakobsson, Martin, Todd, Brian J., Dowdeswell, Evelyn K. and Hogan, Kelly A.. Memoirs of the Geological Society of London, 46 . GSL (Geological Society London), London, pp. 411-412. ISBN 978-1-78620-268-0 DOI 10.1144/M46.88.

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Abstract

Spreading is a type of mass movement where a sediment unit is
extended and broken up into coherent blocks that are displaced
and tilted along a planar slip. High-resolution seafloor data demonstrate that spreading is a common style of submarine mass movement. Submarine spreading is clearly exemplified in the Storegga
Slide, Norwegian margin (Fig. 1a, b). The slide occurred
8100 + 250 cal a BP as a retrogressive slope failure (Haflidason
et al. 2005). It is one of the largest known submarine slides and the
site of repeated sliding activity. Failures on the Norwegian margin
are linked strongly to the growth and retreat of the Fennoscandian
ice sheets, in particular to the alternating deposition of glacigenic
debrites and basal and deformation tills during glacial maxima
(e.g. O1–O2 30–15 ka and O4–O7 200–130 ka sub-units of the
Naust Formation), and of fine-grained glacimarine, hemipelagic
and contouritic sediments during interglacials (e.g. O3 130–30 ka
sub-unit of the Naust Formation). The Naust sub-units are described
in full in Berg et al. (2005). Differences in the geotechnical properties of these sediments, coupled with seismicity, rapid sediment
deposition, associated high pore pressures and the regional topography and structural setting, are responsible for .20 slope failures
across the region during the Quaternary (Solheim et al. 2005).

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