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Contributors
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- By Federico Agliardi, Andrea Alpiger, Gianluca Bianchi Fasani, Lars Harald Blikra, Brian D. Bornhold, Edward N. Bromhead, Marko H.K. Bulmer, D. Calvin Campbell, Marie Charrière, Masahiro Chigira, John J. Clague, John Coggan, Giovanni B. Crosta, Tim Davies, Marc-Henri Derron, Mark Diederichs, Erik Eberhardt, Carlo Esposito, Robin Fell, Paolo Frattini, Corey R. Froese, Monica Ghirotti, Valentin Gischig, James S. Griffiths, Stephen R. Hencher, Reginald L. Hermanns, Kris Holm, Seyyedmahdi Hosseyni, Niels Hovius, Christian Huggel, Florian Humair, Oldrich Hungr, D. Jean Hutchinson, Michel Jaboyedoff, Matthias Jakob, Julien Jakubowski, Randall W. Jibson, Katherine S. Kalenchuk, Nikolay Khabarov, Oliver Korup, Luca Lenti, Serge Leroueil, Simon Loew, Oddvar Longva, Patrick MacGregor, Andrew W. Malone, Salvatore Martino, Scott McDougall, Mika McKinnon, Mauri McSaveney, Patrick Meunier, Dennis Moore, Jeffrey R. Moore, David C. Mosher, Michael Obersteiner, Lucio Olivares, Thierry Oppikofer, Luca Pagano, Massimo Pecci, Andrea Pedrazzini, David Petley, Luciano Picarelli, David J.W. Piper, John Psutka, Nicholas J. Roberts, Gabriele Scarascia Mugnozza, David Stapledon, Douglas Stead, Richard E. Thomson, Paolo Tommasi, J. Kenneth Torrance, Nobuyuki Torii, Gianfranco Urciuoli, Gonghui Wang, Christopher F. Waythomas, Malcolm Whitworth, Heike Willenberg, Xiyong Wu
- Edited by John J. Clague, Simon Fraser University, British Columbia, Douglas Stead, Simon Fraser University, British Columbia
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- Book:
- Landslides
- Published online:
- 05 May 2013
- Print publication:
- 23 August 2012, pp vii-x
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26 - The Åknes rockslide, Norway
- Edited by John J. Clague, Simon Fraser University, British Columbia, Douglas Stead, Simon Fraser University, British Columbia
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- Book:
- Landslides
- Published online:
- 05 May 2013
- Print publication:
- 23 August 2012, pp 323-335
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- Chapter
- Export citation
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Summary
Abstract The Åknes rockslide is a large, slow-moving landslide in Precambrian gneiss in Sunnylvsfjorden in western Norway. It has a volume of more than 50 million m3 and parts are moving at velocities of 2–8 cm per year. If the sliding mass were to fall into the fjord, it would generate large tsunami waves. Given the hazard, a major site investigation was conducted and a monitoring program was established in cooperation with a number of national and international groups. The monitoring program integrated a variety of surface and subsurface instruments, including extensometers, crackmeters, tiltmeters, single lasers, GPS, total station, ground-based radar, geophones, climate station, and borehole inclinometers and piezometers. Reliable power and communications systems operate the instruments and transmit data. Movement data collected to date demonstrate continuous movement throughout the year, but with significant seasonal differences. During spring snowmelt and heavy precipitation events, the rate of movement can increase to 1 mm per day, which is 10 times the annual mean. Preliminary early-warning levels and associated actions have been implemented based on data from the Åknes rockslide and information on historic rockslides elsewhere in coastal Norway.