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Multi-proxy characterisation of the Storegga tsunami and its impact on the early holocene landscapes of the southern North Sea

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Gaffney, Vincent, Fitch, Simon, Bates, Martin, Ware, Roselyn, Kinnaird, Tim, Gearey, Benjamin, Hill, Tom, Telford, Richard, Batt, Cathy, Stern, Ben et al.
(2020) Multi-proxy characterisation of the Storegga tsunami and its impact on the early holocene landscapes of the southern North Sea. Geosciences, 10 (7). 270. doi:10.3390/geosciences10070270

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Official URL: http://dx.doi.org/10.3390/geosciences10070270

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Abstract

Doggerland was a landmass occupying an area currently covered by the North Sea until marine inundation took place during the mid-Holocene, ultimately separating the British landmass from the rest of Europe. The Storegga Event, which triggered a tsunami reflected in sediment deposits in the northern North Sea, northeast coastlines of the British Isles and across the North Atlantic, was a major event during this transgressive phase. The spatial extent of the Storegga tsunami however remains unconfirmed as, to date, no direct evidence for the event has been recovered from the southern North Sea. We present evidence of a tsunami deposit in the southern North Sea at the head of a palaeo-river system that has been identified using seismic survey. The evidence, based on lithostratigraphy, geochemical signatures, macro and microfossils and sedimentary ancient DNA (sedaDNA), supported by optical stimulated luminescence (OSL) and radiocarbon dating, suggests that these deposits were a result of the tsunami. Seismic identification of this stratum and analysis of adjacent cores showed diminished traces of the tsunami which was largely removed by subsequent erosional processes. Our results confirm previous modelling of the impact of the tsunami within this area of the southern North Sea, and also indicate that these effects were temporary, localized, and mitigated by the dense woodland and topography of the area. We conclude that clear physical remnants of the wave in these areas are likely to be restricted to now buried, palaeo-inland basins and incised river valley systems.

Item Type: Journal Article
Subjects: G Geography. Anthropology. Recreation > GB Physical geography
G Geography. Anthropology. Recreation > GC Oceanography
G Geography. Anthropology. Recreation > GN Anthropology
Q Science > QE Geology
Divisions: Faculty of Science > Life Sciences (2010- )
Library of Congress Subject Headings (LCSH): Tsunamis, Geochemistry , Geomorphology , Mesolithic period , North Sea, Paleoseismology -- Holocene, Sediments (Geology) -- Analysis -- North Sea
Journal or Publication Title: Geosciences
Publisher: MDPI AG
ISSN: 2076-3263
Official Date: 15 July 2020
Dates:
DateEvent
15 July 2020Published
11 July 2020Accepted
Volume: 10
Number: 7
Article Number: 270
DOI: 10.3390/geosciences10070270
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
670,518 [ERC] Horizon 2020 Framework Programmehttp://dx.doi.org/10.13039/100010661
PUTJD829Eesti Teadusagentuurhttp://dx.doi.org/10.13039/501100002301

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