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GEOREF RECORD

Tsunami propagation over a wide, shallow continental shelf caused by the Storegga Slide, southeastern North Sea, Denmark

M. Fruergaard, S. Piasecki, P. N. Johannessen, N. Noe-Nygaard, T. J. Andersen, M. Pejrup and L. H. Nielsen
Tsunami propagation over a wide, shallow continental shelf caused by the Storegga Slide, southeastern North Sea, Denmark
Geology (Boulder) (December 2015) 43 (12): 1047-1050

Abstract

The large Storegga slide, which occurred on the Norwegian Atlantic shelf approximately 8150 yr ago, triggered a tsunami that has been identified in sediment deposits along the coasts of Greenland, Norway, the Faroe Islands, the Shetland Islands, Scotland, and the northernmost coasts of England, but hitherto not along the southeastern shores of the North Sea. It has generally been assumed that the shallow continental shelf of the North Sea attenuated and dissipated the energy of the tsunami before it reached those coastlines. We used radiocarbon and optically stimulated luminescence dating as well as stratigraphic, lithologic, chemical, and palynological analyses of sediment cores to identify tsunami deposits on the barrier island of Romo located on the southwestern North Sea coast of Denmark. We show that tsunami sediments were deposited in a freshwater paleolake that is located approximately 16 m below present-day mean sea level. The tsunami sediment run-up was between 1.5 m and 5.5 m above the contemporaneous sea level. Our results demonstrate that the Storegga slide tsunami propagated across the wide (>500 km) and relatively shallow (depth <95 m) continental shelf of the North Sea and resulted in run-up along adjacent coastlines. In contradiction to earlier theoretical studies, the coastline of the southeastern North Sea cannot be regarded as being sheltered from impacts of North Atlantic tsunami incidents.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 43
Serial Issue: 12
Title: Tsunami propagation over a wide, shallow continental shelf caused by the Storegga Slide, southeastern North Sea, Denmark
Affiliation: University of Caen Lower Normandy, Morphodynamique Continentale et Cotiere, Caen, France
Pages: 1047-1050
Published: 20151222
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 23
Accession Number: 2016-002004
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2015351
Illustration Description: illus. incl. sketch map
N55°07'60" - N55°07'60", E08°49'60" - E08°49'60"
Secondary Affiliation: University of Copenhagen, DNK, DenmarkGeological Survey of Denmark and Greenland, DNK, Denmark
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201601
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