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Identification of Weak Layers and Their Role for the Stability of Slopes at Finneidfjord, Northern Norway

Identification of Weak Layers and Their Role for the Stability of Slopes at Finneidfjord, Northern Norway
Identification of Weak Layers and Their Role for the Stability of Slopes at Finneidfjord, Northern Norway
The 1996 Finneidfjord landslide, which took four human lives in northern Norway, initiated along a weak layer in the fjord-marine sediments before developing retrogressively across the shoreline. The integration of results from sediment cores, free-fall cone penetrometer tests and high-resolution 3D seismic data indicates that the slide-prone layer is a regional bed likely sourced from clay-slide activity in the catchment of the fjord. The sediments in this regional layer are softer and more sensitive than the typical bioturbated, fjord-marine deposits, which explains their role in slope instability. In addition, biogenic gas in the stratified event bed may further affect its geotechnical properties. Similar, fine-grained, stratified beds with comparable origin and properties occur in other Norwegian fjords. They are presum- ably also present along coastlines of other previously glaciated margins, where they could contribute to mass movements.
9789400721616
321-330
Springer
L'Heureux, J-S.
bd01b46b-e7ed-4450-881e-73b476c73c6d
Longva, O.
650820e6-adcd-4c02-9c1f-867de9303574
Steiner, A.
5edd1b04-ec65-44e8-8f09-11553a02f0bb
Hansen, L.
c07afee9-a9d5-4d89-9703-2a603a23b8fe
Vardy, Mark E.
8dd019dc-e57d-4b49-8f23-0fa6d246e69d
Vanneste, M.
37b5a71c-888c-4f29-8f7e-62b07b7fd81c
Haflidason, H.
ebb21efe-10de-485d-b77f-011b06f84a98
Brendryen, J.
179c3701-6360-46bc-b4e5-47de65d80bdb
Kvalstad, T.J.
d08080c7-44d8-49e9-9ef9-daa25bd425e4
Forsberg, C.F.
1876547d-d739-4398-8fe7-60139d5313c8
Chand, S.
079ed6bb-3458-497e-aa12-815ab79a4df8
Kopf, A.
e4ffc21c-4cfc-4944-89a1-6ac2ea70c577
Yamada, Y.
Kawamura, K.
Ikehara, K.
Ogawa, Y.
Urgeles, R.
Mosher, D.
Chaytor, J.
Strasser, M.
L'Heureux, J-S.
bd01b46b-e7ed-4450-881e-73b476c73c6d
Longva, O.
650820e6-adcd-4c02-9c1f-867de9303574
Steiner, A.
5edd1b04-ec65-44e8-8f09-11553a02f0bb
Hansen, L.
c07afee9-a9d5-4d89-9703-2a603a23b8fe
Vardy, Mark E.
8dd019dc-e57d-4b49-8f23-0fa6d246e69d
Vanneste, M.
37b5a71c-888c-4f29-8f7e-62b07b7fd81c
Haflidason, H.
ebb21efe-10de-485d-b77f-011b06f84a98
Brendryen, J.
179c3701-6360-46bc-b4e5-47de65d80bdb
Kvalstad, T.J.
d08080c7-44d8-49e9-9ef9-daa25bd425e4
Forsberg, C.F.
1876547d-d739-4398-8fe7-60139d5313c8
Chand, S.
079ed6bb-3458-497e-aa12-815ab79a4df8
Kopf, A.
e4ffc21c-4cfc-4944-89a1-6ac2ea70c577
Yamada, Y.
Kawamura, K.
Ikehara, K.
Ogawa, Y.
Urgeles, R.
Mosher, D.
Chaytor, J.
Strasser, M.

L'Heureux, J-S., Longva, O. and Steiner, A. et al. (2012) Identification of Weak Layers and Their Role for the Stability of Slopes at Finneidfjord, Northern Norway. In, Yamada, Y., Kawamura, K. and Ikehara, K. et al. (eds.) Submarine Mass Movements and Their Consequences. (Advances in Natural and Tehcnological Hazards Research, 31) Heidelberg, DE. Springer, pp. 321-330. (doi:10.1007/978-94-007-2162-3_29).

Record type: Book Section

Abstract

The 1996 Finneidfjord landslide, which took four human lives in northern Norway, initiated along a weak layer in the fjord-marine sediments before developing retrogressively across the shoreline. The integration of results from sediment cores, free-fall cone penetrometer tests and high-resolution 3D seismic data indicates that the slide-prone layer is a regional bed likely sourced from clay-slide activity in the catchment of the fjord. The sediments in this regional layer are softer and more sensitive than the typical bioturbated, fjord-marine deposits, which explains their role in slope instability. In addition, biogenic gas in the stratified event bed may further affect its geotechnical properties. Similar, fine-grained, stratified beds with comparable origin and properties occur in other Norwegian fjords. They are presum- ably also present along coastlines of other previously glaciated margins, where they could contribute to mass movements.

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Published date: 2012
Organisations: Geology & Geophysics

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Local EPrints ID: 301040
URI: http://eprints.soton.ac.uk/id/eprint/301040
ISBN: 9789400721616
PURE UUID: 7ef9fbc8-6d1b-47a8-b3db-1c13c3c41d51

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Date deposited: 27 Feb 2012 14:32
Last modified: 22 Jul 2022 18:00

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Contributors

Author: J-S. L'Heureux
Author: O. Longva
Author: A. Steiner
Author: L. Hansen
Author: Mark E. Vardy
Author: M. Vanneste
Author: H. Haflidason
Author: J. Brendryen
Author: T.J. Kvalstad
Author: C.F. Forsberg
Author: S. Chand
Author: A. Kopf
Editor: Y. Yamada
Editor: K. Kawamura
Editor: K. Ikehara
Editor: Y. Ogawa
Editor: R. Urgeles
Editor: D. Mosher
Editor: J. Chaytor
Editor: M. Strasser

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