From an Unstable Rock Slope at Åkerneset to Tsunami Risk in Western Norway
Coastal Engineering 88 (2014) 101–122 Contents lists available at ScienceDirect Coastal Engineering journal homepage: www.elsevier.com/locate/coastaleng Rockslide tsunamis in complex fjords: From an unstable rock slope at Åkerneset to tsunami risk in western Norway C.B. Harbitz a,b,c,⁎, S. Glimsdal a,b,c, F. Løvholt a,b,c,V.Kveldsvikb,G.K.Pedersena,c, A. Jensen a a Department of Mathematics, University of Oslo, PO Box 1053 Blindern, 0316 Oslo, Norway b Norwegian Geotechnical Institute (NGI), PO Box 3930 Ullevaal Stadion, N-0806 OSLO, Norway c International Centre for Geohazards (ICG), c/o NGI, PO Box 3930 Ullevaal Stadion, N-0806 OSLO, Norway article info abstract Article history: An unstable rock volume of more than 50 million m3 has been detected in the Åkerneset rock slope in the narrow Received 17 December 2012 fjord, Storfjorden, Møre & Romsdal County, Western Norway. If large portions of the volume are released as a Received in revised form 2 February 2014 whole, the rockslide will generate a tsunami that may be devastating to several settlements and numerous vis- Accepted 5 February 2014 iting tourists along the fjord. The threat is analysed by a multidisciplinary approach spanning from rock-slope sta- Available online xxxx bility via rockslide and wave mechanics to hazard zoning and risk assessment. The rockslide tsunami hazard and the tsunami early-warning system related to the two unstable rock slopes at Keywords: Rockslide Åkerneset and Hegguraksla in the complex fjord system are managed by Åknes/Tafjord Beredskap IKS (previous- Tsunami ly the Åknes/Tafjord project). The present paper focuses on the tsunami analyses performed for this company to Risk better understand the effects of rockslide-generated tsunamis from Åkerneset and Hegguraksla.
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