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Propagation of the Storegga tsunami into ice-free lakes along the southern shores of the Barents Sea
Article first published online: 8 JUN 2011
DOI: 10.1002/jqs.1511
Copyright © 2011 John Wiley & Sons, Ltd.
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How to Cite
Romundset, A. and Bondevik, S. (2011), Propagation of the Storegga tsunami into ice-free lakes along the southern shores of the Barents Sea. J. Quaternary Sci., 26: 457–462. doi: 10.1002/jqs.1511
Publication History
- Issue published online: 24 JUN 2011
- Article first published online: 8 JUN 2011
- Manuscript Accepted: 28 MAR 2011
- Manuscript Revised: 26 MAR 2011
- Manuscript Received: 27 JAN 2011
- Abstract
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Keywords:
- Storegga;
- tsunami deposits;
- coastal lakes;
- Barents Sea;
- Holocene
Abstract
Deposits in coastal lakes in northernmost Norway reveal that the Storegga tsunami propagated well into the Barents Sea ca. 8100–8200 years ago. A tsunami deposit – found in cores from five coastal lakes located near the North Cape in Finnmark – rests on an erosional unconformity and consists of graded sand layers and re-deposited organic remains. Rip-up clasts of lake mud, peat and soil suggest strong erosion of the lake floor and neighbouring land. Inundation reached at least 500 m inland and minimum vertical run-up has been reconstructed to 3–4 m. In this part of the Arctic coastal lakes are usually covered by >1 m of solid lake ice in winter. The significant erosion and deposition of rip-up clasts indicate that the lakes were ice free and that the ground was probably not frozen. We suggest that the Storegga slide and ensuing tsunami happened sometime in the summer season, between April and October. Copyright © 2011 John Wiley & Sons, Ltd.