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Regional spatial variations in rockslide distribution from structural geology ranking: an example from Storfjorden, western Norway

By
Iain H. C. Henderson
Iain H. C. Henderson
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Aline Saintot
Aline Saintot
Geological Survey of Norway, Leiv Eirikssons Veg 39, 7491 Trondheim, Norway
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Published:
January 01, 2011

Abstract

Structural geology has recently become a key topic in landslide research. However, the link between regional structures, their cumulative contribution to rockslide development and their significance in a spatial framework is uncertain. We examine the influence of structures on rockslide susceptibility in the Storfjorden area, a 900 km2 fjord complex in western Norway that includes the monitored rockslide sites of Åknes and Heggursaksla. We have newly identified 52 potential rockslide sites from aerial photographs. The structural features critical for the development of large rockslides (fjord-dipping foliation, basal shear plane and breccia, extensional fracture and transfer fault) have a spatial bias in orientation. Rockslides are more likely to develop in specific fjord orientations that have favourably oriented structures. Therefore, the development of rockslides has a marked spatial distribution that we describe qualitatively with an inventory of structural features. Sites with the full plethora of features display the most movement, the largest volumes and are already under the closest scrutiny with regard to monitoring. These sites are also spatially biased, the largest clustering occurring in west Sunnylyvsfjorden. The utilization of structural criteria can show trends in spatial distribution of rockslide potential and on a regional scale can be an important tool in susceptibility analysis.

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Contents

Geological Society, London, Special Publications

Slope Tectonics

M. Jaboyedoff
M. Jaboyedoff
University of Lausanne, Switzerland
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Geological Society of London
Volume
351
ISBN electronic:
9781862395992
Publication date:
January 01, 2011

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