Aline Saintot, Thierry Oppikofer, Marc-Henri Derron, iain Henderson


Large gravitational rock slope deformation affects Precambrian gneisses at four localities of the Romsdalen valley of Western Norway. At each locality, detailed studies have allowed to determine the mechanism of deformation and to assess the degree of susceptibility for failure. 1) Svarttinden is a 4.3 Mm3 translational rockslide. Its single basal detachment developed along a foliation-parallel cataclastic fault. Although a rockslide occurred along the same detachment and the deposits reached the edge of the plateau, no displacement of the current instability is detected. 2) At Flatmark distinct 2‑25 Mm3 blocks detached from the edge of the plateau by an opening along the steep foliation. The collapse of the blocks is explained by a complex mechanism of sliding and toppling. No displacement is actually detected on the instabilities. 3) At Børa blocks located at the edge of the plateau deformed by the same mechanism as at Flatmark. They have a maximum volume of 0.5 Mm3 and displacement rates of 0.2‑2 cm/year. The deformation at Børa has affected a large part of the plateau and the entire deformed volume would be of 50‑200 Mm3 but it is currently inactive. 4) A wedge failure at the edge of Mannen plateau is inferred to allow the 4-5 cm/year downward displacement of a 2‑3.5 Mm3 instability. The high susceptibility of failure led to a permanent monitoring of the site since 2009.


Agliardi, F., Crosta, G. B. and Zanchi, A. 2001. Structural constraints on deep-seated slope deformation kinematics. Engineering Geology 59: 83 102.

Ahnert, F. 1987. Process-response models of denudation at different spatial scales. Catena Supplement 10: 31 50.

Ambrosi, C. and Crosta, G.B. 2006. Large sackung along major tectonic features in the central Italian Alps. Engineering Geology 83: 183 200.

Bachmann, D., Bouissou, S. and Chemenda, A. 2004. Influence of weathering and pre-existing large scale fractures on gravitational slope failure: insights from 3-D physical modeling. Natural Hazards and Earth System Sciences 4: 711 717.

Böhme, M., Saintot, A., Henderson, I., Henriksen, H. and Hermanns, R.L. 2011. Slope instabilities in Sogn og Fjordane County, Norway. In Jaboyedoff, M. (ed.) Slope Tectonics, Geological Society, London, Special Publications 351: 97 111.

Blikra, L.H., Braathen, A., Anda, E., Stalsberg, K. and Longva, O. 2002. Rock avalanches, gravitational bedrock fractures and neotectonic faults onshore northern Norway: Examples, regional distribution and triggering mechanisms. NGU Report 2002.016, Geological Survey of Norway, Trondheim, Norway.

Blikra, L.H., Longva, O., Braathen, A., Anda, E., Dehls, J. and Stalsberg, K. 2006. Rock slope failures in Norwegian fjord areas: examples, spatial distribution and temporal pattern. In Evans, S.G., Scarascia Mugnozza, G., Strom, A. and Hermanns, R.L. (eds.) Landslides from Massive Rock Slope Failure, NATO Science Series, IV. Earth and Environmental Sciences 49, Springer: 475 496, Dordrecht, Netherlands.

Braathen, A., Blikra, L.H., Berg, S.S. and Karlsen, F. 2004. Rock slope failures in Norway; type, geometry, deformation mechanisms and stability. Norwegian Journal of Geology 84: 67 88.

Brideau, M.-A., Stead, D., Kinakin, D. and Fecova, K. 2005. Influence of tectonic structures on the Hope Slide, British Columbia, Canada. Engineering Geology 80: 342 359.

Brideau, M.-A., Yan, M. and Stead, D. 2009. The role of tectonic damage and brittle rock fracture in the development of large rock slope failures. Geomorphology 103: 30 49.

Cruden, D.M. 1976. Major slides in the Rockies. Canadian Geotechnical Journal 13: 8 20.

Cruden, D.M. and Varnes, D.J. 1996. Landslide types and processes. In Turner, A.K. and Schuster, R.L. (eds.) Landslides: Investigation and Mitigation. Special Report 247, Transportation Research Board, National Research Council, Washington DC: 36 75.

Dahle, H., Anda, E., Saintot, A. and Sætre, S. 2008. Faren for fjellskred fra fjellet Mannen i Romsdalen. NGU Report 2008.087, Geological Survey of Norway, Trondheim, Norway [in Norwegian].

Dahle, H., Saintot, A., Blikra, L.H. and Anda, E. 2010. Geofagleg oppfølging av ustabilt fjellparti ved Mannen i Romsdalen. NGU Report 2010.022, Geological Survey of Norway, Trondheim, Norway [in Norwegian].

Dahle, H., Bjerke, P.L., Crosta, G., Hermanns, R.L., Anda, E. and Saintot, A. 2011. Faresoner for utløp, oppdemming og flom som følge av fjellskredfare ved Mannen, NGU Report 2011.058, Geological Survey of Norway, Trondheim, Norway [in Norwegian].

Eberhardt, E., Stead, D. and Coggan, J.S. 2004. Numerical analysis of initiation and progressive failure in natural rock slopes – the 1991 Randa Rockslide. International Journal of Rock Mechanics and Mining Sciences 41: 69 87.

El Bedoui, S., Guglielmi, Y., Lebourg, T. and Pérez, J.-L. 2008. Deep-seated failure propagation in a fractured rock slope over 10,000 years: the La Clapière slope, the south-eastern French Alps. Geomorphology 105: 232 238.

ESRI (Environmental Systems Research Institute) 2010. ArcGIS [software]. Version 10, Environmental Systems Research Institute Inc., Redlands, CA.

Etzelmüller, B., Romstad, B. and Fjellanger, J. 2007. Automatic regional classification of topography in Norway. Norwegian Journal of Geology 87: 167 180.

Farsund, T.Ø. 2010. Geology, DEM analysis and geohazard assessment of the Romsdalen valley. Unpublished MSc project thesis TGB4500, Department of geology and mineral resources engineering, Norwegian University of Sciences and Technology, Trondheim.

Farsund, T.Ø. 2011 Geological and numerical stability modelling of Mannen, Romsdalen MSc thesis in Petroleum Geosciences and Engineering, Norwegian University of Sciences and Technology, Trondheim.

Fell, R., Corominas, J., Bonnard, C., Cascini, L., Leroi, E. and Savage, W.Z. 2008. Guidelines for landslide susceptibility, hazard and risk zoning for land use planning. Engineering Geology 102: 85 98.

Fisher, R.A. 1953. Dispersion on a sphere. Proceedings of the Royal Society of London, Series A, 217: 295–305.

Ganerød, G.V., Grøneng, G., Rønning, J.S., Dalsegg, E., Elvebakk, H., Tønnesen, J.F., Kveldsvik, V., Eiken, T., Blikra, L.H. and Braathen, A. 2008. Geological model of the Åknes rockslide, western Norway. Engineering Geology 102: 1 18.

Giraud, A., Rochet, R. and Antoine, P. 1990. Processes of slope failure in crystallophyllian formations. Engineering Geology 29: 241-253.

Guzzetti, F., Cardinali, M. and Reichenbach, P. 1996. The influence of tectonic setting and lithology on the landslide type and pattern. Environmental and Engineering Geoscience 2: 531 555.

Henderson, I.H.C. and Saintot, A. 2007. Fjellskredundersøkelser i Møre og Romsdal. NGU Report 2007.043, Geological Survey of Norway, Trondheim, Norway [in Norwegian].

Henderson, I.H.C., Saintot, A. and Derron, M.-H. 2006. Structural mapping of potential rockslide sites in the Storfjorden area, Western Norway: the influence of bedrock geology on hazard analysis. NGU Report 2006.052, Geological Survey of Norway, Trondheim, Norway.

Henderson, I.H.C. and Saintot, A. 2011. Regional spatial variations in rockslide distribution from structural geology ranking: an example from Storfjorden, western Norway. In Jaboyedoff, M. (ed.) Slope Tectonics. Geological Society Special Publication 351, p. 79.

Hermanns, R.L. and Strecker, M.R. 1999. Structural and lithological controls on large Quaternary rock avalanches (sturzstroms) in arid northwestern Argentina. Geological Society of America Bulletin 111: 934 948.

Hoek, E. and Bray, J. 1981. Rock slope engineering, revised 3rd edition. The Institution of Mining and Metallurgy, London: 37 63.

Hossack, J.R. and Cooper, M.A. 1986. Collision tectonics in the Scandinavian Caledonides. Geological Society of London. Special Publication 19: 287-304.

InnovMetric 2012. PolyWorks: 3D scanner and 3D digitizer software from InnovMetric Software Inc., accessed 20.01.2012.

Jaboyedoff, M., Baillifard, F., Couture, R., Locat, J. and Locat, P. 2004a. New insight of geomorphology and landslide prone area detection using Digital Elevation Model(s). In Lacerda, W.A., Ehrlich, M., Fontoura, A.B. and Sayão, A. (eds.) Landslides: Evaluation and Stabilization, Taylor & Francis Group: 191 198, London.

Jaboyedoff, M., Baillifard, F., Couture, R., Locat, J. and Locat, P. 2004b. Toward preliminary hazard assessment using DEM topographic analysis and simple mechanical modeling by means of sloping local base level. In Lacerda, W.A., Ehrlich, M., Fontoura, A.B. and Sayão, A. (eds.) Landslides: Evaluation and Stabilization, Taylor & Francis Group: 199 205, London.

Jaboyedoff, M., Couture, R. and Locat, P. 2009. Structural analysis of Turtle Mountain (Alberta) using digital elevation model: Towards a progressive failure. Geomorphology 103: 5 16.

Jaboyedoff, M., Oppikofer, T., Derron, M.-H., Blikra, L.H., Böhme, M. and Saintot, A. 2011. Complex landslide behaviour and structural control: a three dimensional conceptual model of the Åknes rockslide, Norway. In Jaboyedoff, M. (ed.) Slope Tectonics, Geological Society, London, Special Publications 351: 147 162.

Julian, M. and Anthony, E. 1996. Aspects of landslide activity in the Mercantour Massif and the French Riviera, southeastern France. Geomorphology 15: 275 289.

Kellogg, K.S. 2001. Tectonic controls on a large landslide complex: Williams Fork Mountains near Dillon, Colorado. Geomorphology 41: 355 368.

Longchamp, C., Delasoie, F., Carrea, D., Derron, M.-H., Oppikofer, T. and Jaboyedoff, M. 2010. Analysis of groundbased Lidar data from Møre og Romsdal County (Norway), Unpublished Report IGAR – UNIL.

Longva, O., Blikra, L.H. and Dehls, J. 2009. Rock avalanches – distribution and frequencies in the inner part of Storfjorden, Møre og Romsdal County, Norway. NGU report 2009.002, Geological Survey of Norway, Trondheim, Norway.

Mahr, T. 1977. Deep-reaching gravitational deformations of high mountain slopes. Bulletin of the International Association of Engineering Geology 16: 121–127.

Mangerud, J. 2004. Ice sheet limits in Norway and on the Norwegian continental shelf. In Ehlers, J. and Gibbard, P.L. (eds.) Quaternary Glaciations Extent and Chronology Part I: Europe, Elsevier: 271 294.

Mosar, J. 2003. Scandinavia’s North Atlantic passive margin. Journal of Geophysical Research 108: NO. B8, 2360, doi:10.1029/2002JB002134.

Olesen, O., Dehls, J., Bungum, H., Riis, F., Hicks, E., Lindholm, C., Blikra, L.H., Fjeldskaar, W., Olsen, L., Longva, O., Faleide, J.I., Bockmann, L., Rise, L., Roberts, D., Braathen, A. and Brekke, H. 2000. Neotectonics in Norway, Final Report. Geological Survey of Norway, Report 2000.002, Geological Survey of Norway, Trondheim, Norway.

Olesen, O., Blikra, L.H., Braathen, A., Dehls, J.F., Olsen, L., Rise, L., Roberts, D., Riis, F., Faleide, J.I. and Anda, E. 2004. Neotectonic deformation in Norway and its implications: a review. Norwegian Journal of Geology 84: 3–34.

Oppikofer, T. 2009. Detection, analysis and monitoring of slope movements by high resolution digital elevation models, PhD thesis, Institute of Geomatics and Analysis of Risk, University of Lausanne, Lausanne, Switzerland.

Oppikofer, T., Jaboyedoff, M., Blikra, L.H. and Derron, M.-H. 2009. Characterization and monitoring of the Åknes rockslide using terrestrial laser scanning. Natural Hazards and Earth System Sciences 9: 1003 1019.

Oppikofer, T., Jaboyedoff, M., Pedrazzini, A., Derron, M.-H. and Blikra, L.H. 2011. Detailed DEM analysis of a rockslide scar to improve the basal failure surface model of active rockslides. Journal of Geophysical Research 116: F02016. doi:10.1029/2010JF001807.

Oppikofer, T., Hermanns, R.L., Redfield, T.F., Sepúlveda, S.A., Duhart, P. and Bascuñan, I. 2012. Morphologic description of the Punta Cola rock avalanche and associated minor rockslides caused by the 21 April 2007 Aysén earthquake (Patagonia, southern Chile). Revista de la Asociación Geológica Argentina, this volume.

Pedrazzini, A., Froese, C.R., Jaboyedoff, M., Hungr, O. and Humair, F. in press. Combining digital elevation model analysis and run-out modelling to characterize hazard posed by a potentially unstable rock slope at Turtle Mountain, Alberta, Canada. Engineering Geology: doi:10.1016/j.enggeo.2011.03.015.

Roberts, D. 2003. The Scandinavian Caledonides: event chronology, palaeogeographic settings and likely modern analogues. Tectonophysics 363: 283-299.

Roberts, D. and Gee, D.G. 1985. An introduction to the structure of the Scandinavian Caledonides. In Gee, D.G. and Sturt B.A. (eds) The Caledonide Orogen - Scandinavia and related areas 55-68. John Wiley and Sons, Chichester.

Saintot, A., Elvebakk, H., Ganerød, G.V., Oppikofer, T. and Farsund, T. 2011a. Mannen unstable rock slope (Romsdal, Møre & Romsdal County): Logging of drill hole and core KH-01-10, geomorphological interpretation of a 1 m resolution digital elevation model and terrestrial laser scan displacement analysis. NGU Report 2011.026, Geological Survey of Norway, Trondheim, Norway.

Saintot, A., Henderson, I. and Derron, M.-H. 2011b. Inheritance of ductile and brittle structures in the development of large rock slope instabilities: examples from Western Norway. In Jaboyedoff, M. (ed.) Slope Tectonics, Geological Society, London, Special Publications 351: 27 78.

Sauchyn, D.J., Cruden, D.M. and Hu, H.Q. 1998. Structural control of the morphometry of open rock basins, Kananaskis region, southwestern Alberta. Geomorphology 22: 313–324.

Selby, M.J. 1993. Hillslope Materials and Processes. Oxford University Press, New York.

Skrednett 2012. Skreddata på nett., accessed 06.02.2012 [in Norwegian].

Torsvik, T.H., Andersen, T.B. Eide, E.A. and. Walderhaug, H.J. 1997. The age and tectonic significance of dolerite dykes in western Norway. Journal of Geological Society of London 154: 961– 973.

Tveten, E., Lutro, O. and Thorsnes, T. 1998. Geologisk kart over Norge, berggrunnskart Ålesund, 1:250,000. Geological Survey of Norway, Trondheim [in Norwegian].

Valle, P., Faerseth, R. B. and Fossen, H. 2002. Devonian–Triassic brittle deformation based on dyke geometry and fault kinematics in the Sunnhordland region, SW Norway. Norwegian Journal of Geology 82: 3–17.

Varnes, D.J. 1978. Slope movement types and processes. In Schuster, R.L. and Krizek, R.J. (eds.) Landslides, Analysis and Control. Transportation Research Board Special Report, 176. National Research Council, Washington, DC: 11 33.

Wallbrecher, E. 1986. Tektonische und gefügeanalytische Arbeitsweisen. Enke-Verlag, Stuttgart [in German].

Weinberger, R., Eyal, Y. and Mortimer, N. 2010. Formation of systematic joints in metamorphic rocks due to release of residual elastic strain energy, Otago Schist, New Zealand. Journal of Structural Geology 32: 288 305.

Welkner, D., Eberhardt, E. and Hermanns, R.L. 2010. Hazard investigation of the Portillo Rock Avalanche site, central Andes, Chile, using an integrated field mapping and numerical modelling approach. Engineering Geology 114: 278 297.

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