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Martina Böhme, Norges Geologiske Undersøkelse (Norway)
Lars Harald Blikra, Norges Geologiske Undersøkelse (Norway)
Marc-Henry Derron, Norges Geologiske Undersøkelse (Norway)
John Dehls, Norges Geologiske Undersøkelse (Norway)
Iain Henderson, Norges Geologiske Undersøkelse (Norway)
Michel Jaboyedoff, University of Lausanne (Switzerland)
Aline Saintot, Norges Geologiske Undersøkelse (Norway)
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During the last century Norway has been afflicted by several natural disasters with large loss of life due to landslides and related tsunamis. In the future there is likely to be an increase in problems regarding landslides because of increased precipitation and melting of permafrost as a result of climate change. A major challenge for society is to efficiently find and investigate possible future events. Assuming that future rockslides will occur under similar geological and geometrical circumstances as past rockslides have occurred, it is essential to study ancient and also currently known rock-slope instabilities in order to limit the effect of big catastrophes in the future. For this reason, the critical factors involved in the development of rockslides in certain regions of western Norway are determined and quantitative spatial relationships between the occurrences of rockslides and their controlling factors or structures are established.
An integrated approach employing different methods and data sources including all kind of accessible remote sensing data, such as satellite images, orthophotos, InSAR and Lidar data, is used to analyse rock-slope instabilities spatially. It has been recently shown that especially Lidar-derived DEMs have a high potential to detect current instabilities morphologically. The activity of the newly detected instabilities will now be quantified by the use of InSAR techniques. In addition, fieldwork including integrated structural geology and geomorphology in parts of the investigation area yields an extensive amount of data and also provides ground checks of the results.
The final objective is to delineate instabilities on a regional scale and assess the present activity using mainly remote sensing technologies, with more efficient methods than the currently used "trial-and-error" surveys. This integrated approach aims to provide a better understanding of the spatial distribution of rockslide events and the underlying reasons for their development.
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