Holocene relative sea level history and Storegga tsunami run‐up in Lyngen, northern Norway
ABSTRACT We re‐investigated three isolation basins in Lyngen in Troms, Norway, that contained a mixed facies of terrestrial and marine origin. Here we show that the mixed facies was deposited by the Storegga tsunami. We reconstruct the run‐up of the tsunami to 6–7 m above mean sea level of that time...
| Published in: | Journal of Quaternary Science |
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| Main Authors: | , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Wiley
2018
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1002/jqs.3021 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.3021 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3021 |
| Summary: | ABSTRACT We re‐investigated three isolation basins in Lyngen in Troms, Norway, that contained a mixed facies of terrestrial and marine origin. Here we show that the mixed facies was deposited by the Storegga tsunami. We reconstruct the run‐up of the tsunami to 6–7 m above mean sea level of that time, in agreement with numerical modelling. In addition, our new cores revealed a layer of lake‐gyttja below marine deposits, and radiocarbon ages of plant fragments extracted from that gyttja date the sea level lowstand to 9400 cal a BP. These ages, and our new understanding of the mixed facies as Storegga tsunami deposits, improve the previously published sea‐level curve. The radiocarbon age of a sea urchin, assumed to have been killed in the Storegga tsunami event, shows that the reservoir age of the coastal waters in Troms was 400 years (Δ R = 45 ± 41) at that time − similar to the present‐day value. |
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