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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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- Chapter
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24 - Randa:
- Edited by John J. Clague, Simon Fraser University, British Columbia, Douglas Stead, Simon Fraser University, British Columbia
-
- Book:
- Landslides
- Published online:
- 05 May 2013
- Print publication:
- 23 August 2012, pp 297-309
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- Chapter
- Export citation
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Summary
Abstract In this chapter we summarize integrated investigations carried out at the Randa rock-slope instability in Matter Valley, Switzerland, between 2000 and 2010. We present a 3D geometric and structural model of the current instability, which consists of 5–6 million m3 of crystalline rock. We also document the complex kinematic behavior and discuss the driving factors for observed slope movements. We show that both the May 1991 failure and the current instability are bounded laterally by the same large-scale fault, and at the base by a planar or stepped rupture surface daylighting at the contact with the Randa orthogneiss. The spatial distribution of current displacements indicates toppling in the upper section of the instability between 2200 and 2400 m asl and sliding in the lower area between 1900 and 2200 m asl. Continuous displacement time series from the surface and deep boreholes show increasing deformation rates when ground surface temperatures decrease in fall and a decrease after snowmelt in spring as the rock warms. We have not detected displacement signatures related to heavy rainstorms or snowmelt. Mapping of the locations of springs and recordings of borehole pore water pressure demonstrate locally perched groundwater in open fractures, and a low regional groundwater table located at or below the basal rupture surface. Numerical modeling results support the hypothesis that thermo-mechanical coupled deformation resulting from annual temperature changes and critically stressed fractures in a complex topography is the primary mechanism driving deep-seated displacements at Randa.