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Paraglacial Rock-Slope Failure Following Deglaciation in Western Norway

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Landscapes and Landforms of Norway

Part of the book series: World Geomorphological Landscapes ((WGLC))

Abstract

The paraglacial framework describes the geomorphological response to glaciation and deglaciation, whereby non-renewable, metastable, glacially conditioned sediment sources are progressively released by a range of nonglacial processes. These include slope failures that directly modify the bedrock topography of mountain landscapes. This chapter synthesises recent research on the paraglacial evolution of western Norway’s mountain rock-slopes, and evaluates the importance of glaciation, deglaciation and associated climatic and non-climatic processes. Following an introduction to the concept of paraglacial landscape change, current understanding of rock-slope responses to deglaciation is outlined, focusing on the spatial distribution, timing, duration and causes of rock-slope failure activity. Preliminary analysis of an inventory of published ages for 49 prehistoric, moderate-large (>103 m3) rock-slope failures (RSFs) indicates that the great majority occurred in the Late Weichselian/Early Holocene transition (~13–9 ka), within 2 ka of deglaciation. Subsequent RSFs were much smaller, though event frequency increased again at 8–7 ka and 5–4 ka BP. The majority of dated RSFs were not directly triggered by deglaciation (debuttressing) but were preconditioned for more than 1000 years after ice withdrawal, until slopes collapsed. It is proposed that the primary causes of failure within 2 ka of ice retreat were stress redistribution, subcritical fracture propagation, with some events possibly triggered by seismic activity. While earthquakes may have triggered renewed failure of rock-slopes in the Late Holocene, it seems likely that permafrost degradation and water supply were locally important. Priority avenues for further research are briefly identified.

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Acknowledgements

The author is especially grateful to Paula Hilger, John Matthews and Peter Wilson for kindly supplying photographs, and to Reginald Hermanns for giving valuable feedback on an early draft. The author, however, is solely responsible for the final outcome. Technical support from Mr. Aiden Bygrave is gratefully acknowledged.

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    Alastair M. Curry

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Curry, A.M. (2021). Paraglacial Rock-Slope Failure Following Deglaciation in Western Norway. In: Beylich, A.A. (eds) Landscapes and Landforms of Norway. World Geomorphological Landscapes. Springer, Cham. https://doi.org/10.1007/978-3-030-52563-7_5

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