Abstract
From studies of orthophotos and through field work, a complex deformation pattern has been recognized in the Lyngen area, Troms, Norway. The area is among the most alpine in Norway and contains a strong clustering of rock slope failures. The rock slope failures are characterized by two different deformation styles, and the difference in style is geographically separated by a fjord and valley lineament. Field studies suggest that two directions of tension oriented almost perpendicular to each other, utilize pre-existing brittle to brittle/ductile fabrics inherited from much older deformation events. The NE-SW direction of tension is parallel to the average displacement vector pointing down-dip along inherited faults. This vector is gravitationally controlled. The NW-SE displacement vector trends strike-parallel along the inherited faults. The presence of the latter appears to be confined geographically.
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Acknowledgments
This work is part of the project ROS Fjellskredanalyse i Troms, a collaboration project between the Norwegian Geological Survey (NGU) and the Norwegian Water Resources and Energy Directorate (NVE). The project is fully financed by NVE.
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Bunkholt, H., Redfield, T., Osmundsen, P.T., Oppikofer, T., Hermanns, R.L., Dehls, J. (2013). The Role of Inherited Structures in Deep Seated Slope Failures in Kåfjorden, Norway. In: Margottini, C., Canuti, P., Sassa, K. (eds) Landslide Science and Practice. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-31325-7_35
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