Characterization, Geometry, Temporal Evolution and Controlling Mechanisms of the Jettan Rock-Slide, Northern Norway

Lars Harald Blikra; Hanne Hvidtfeldt Christiansen; Lene  Kristensen; Mario  Lovisolo

doi:10.1007/978-3-319-09057-3_40

Characterization, Geometry, Temporal Evolution and Controlling Mechanisms of the Jettan Rock-Slide, Northern Norway

Lars Harald Blikra, Hanne Hvidtfeldt Christiansen, Lene Kristensen, Mario Lovisolo

Geography

4 Citations (Scopus)

Abstract

The Jettan rockslide is an active topmost part of a large instability in paragneiss along the fjord Storfjorden in Northern Norway. It has deep back fractures in the top part with sliding planes at 45–50 m depth. The sliding planes seem to be controlled largely by SW-NE trending regional faults dipping steeply downslope towards NW. The displacements vary from about 2 cm–5 cm/year. The active movements demonstrate a systematic seasonal trend with displacements initiating during snowmelt in mid-May, decreasing during the late autumn and early winter and with low deformations until spring. The top part of the rockslide sectors has discontinuous permafrost, while sporadic permafrost is documented to exist in the open fractures in the lower parts. The seasonal changes is thought to be controlled by changing shear strength of the brecciated sliding planes due to either raising ice temperatures within the detachment zones and/or variations in water infiltration from local ice bodies to the unsaturated sliding zones.

Original language	English
Title of host publication	Engineering Geology for Society and Territory : Landslide Processes
Editors	Giorgio Lollino, Daniele Giordan, Giovanni B. Crosta, Jordi Corominas, Rafig Azzam, Janusz Wasowski, Nicola Sciarra
Number of pages	6
Volume	2
Publisher	Springer Science+Business Media
Publication date	1 Jan 2015
Pages	273-278
Chapter	40
ISBN (Print)	978-3-319-09056-6
ISBN (Electronic)	978-3-319-09057-3
DOIs	https://doi.org/10.1007/978-3-319-09057-3_40
Publication status	Published - 1 Jan 2015

Access to Document

10.1007/978-3-319-09057-3_40

Cite this

Blikra, L. H., Christiansen, H. H., Kristensen, L., & Lovisolo, M. (2015). Characterization, Geometry, Temporal Evolution and Controlling Mechanisms of the Jettan Rock-Slide, Northern Norway. In G. Lollino, D. Giordan, G. B. Crosta, J. Corominas, R. Azzam, J. Wasowski, & N. Sciarra (Eds.), Engineering Geology for Society and Territory: Landslide Processes (Vol. 2, pp. 273-278). Springer Science+Business Media. https://doi.org/10.1007/978-3-319-09057-3_40

Characterization, Geometry, Temporal Evolution and Controlling Mechanisms of the Jettan Rock-Slide, Northern Norway. / Blikra, Lars Harald; Christiansen, Hanne Hvidtfeldt; Kristensen, Lene et al.

Engineering Geology for Society and Territory: Landslide Processes. ed. / Giorgio Lollino; Daniele Giordan; Giovanni B. Crosta; Jordi Corominas; Rafig Azzam; Janusz Wasowski; Nicola Sciarra. Vol. 2 Springer Science+Business Media, 2015. p. 273-278.

Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research › peer-review

Blikra, LH, Christiansen, HH, Kristensen, L & Lovisolo, M 2015, Characterization, Geometry, Temporal Evolution and Controlling Mechanisms of the Jettan Rock-Slide, Northern Norway. in G Lollino, D Giordan, GB Crosta, J Corominas, R Azzam, J Wasowski & N Sciarra (eds), Engineering Geology for Society and Territory: Landslide Processes. vol. 2, Springer Science+Business Media, pp. 273-278. https://doi.org/10.1007/978-3-319-09057-3_40

Blikra LH, Christiansen HH, Kristensen L, Lovisolo M. Characterization, Geometry, Temporal Evolution and Controlling Mechanisms of the Jettan Rock-Slide, Northern Norway. In Lollino G, Giordan D, Crosta GB, Corominas J, Azzam R, Wasowski J, Sciarra N, editors, Engineering Geology for Society and Territory: Landslide Processes. Vol. 2. Springer Science+Business Media. 2015. p. 273-278 doi: 10.1007/978-3-319-09057-3_40

Blikra, Lars Harald ; Christiansen, Hanne Hvidtfeldt ; Kristensen, Lene et al. / Characterization, Geometry, Temporal Evolution and Controlling Mechanisms of the Jettan Rock-Slide, Northern Norway. Engineering Geology for Society and Territory: Landslide Processes. editor / Giorgio Lollino ; Daniele Giordan ; Giovanni B. Crosta ; Jordi Corominas ; Rafig Azzam ; Janusz Wasowski ; Nicola Sciarra. Vol. 2 Springer Science+Business Media, 2015. pp. 273-278

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abstract = "The Jettan rockslide is an active topmost part of a large instability in paragneiss along the fjord Storfjorden in Northern Norway. It has deep back fractures in the top part with sliding planes at 45–50 m depth. The sliding planes seem to be controlled largely by SW-NE trending regional faults dipping steeply downslope towards NW. The displacements vary from about 2 cm–5 cm/year. The active movements demonstrate a systematic seasonal trend with displacements initiating during snowmelt in mid-May, decreasing during the late autumn and early winter and with low deformations until spring. The top part of the rockslide sectors has discontinuous permafrost, while sporadic permafrost is documented to exist in the open fractures in the lower parts. The seasonal changes is thought to be controlled by changing shear strength of the brecciated sliding planes due to either raising ice temperatures within the detachment zones and/or variations in water infiltration from local ice bodies to the unsaturated sliding zones.",

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