Storegga

Digital 3D elevation model of the North Atlantic with marking of the position of the Storegga slide (yellow). The relief is shown here strongly exaggerated , so that the continental slope appears very steep.

As Storegga (Norwegian: large edge ), the continental slope in the European North Sea off the Norwegian coast on the southern Vøring Plateau referred below which has formed far-reaching into the North Atlantic rubble and mud heap extended by repeated landslides over the millennia a .

Dating

The Storegga slide , also known as the Storegga event , took place in several phases about 8200 years ago (7250 ± 250 ¹⁴ C yrs BP ) according to radiocarbon dating , with the majority of the slide mass being mobilized during the first slide event.

Storegga slide

Place and direction ...

... as well as the heights of the generated tsunamis

event

Deposits of the Storegga tsunami (gray, upper layer), bracketed by peat (dark brown layers), taken near Maryton on the Montrose Depression in Scotland

The landslides are associated with the progressive destabilization of gas hydrates , especially methane hydrate . A major slide event with the shelf edge breaking off can lead to a tsunami . As a result of the Storegga landslide, tsunam-inherent deposits can still be found on the Atlantic coasts in Northern Europe: On the Norwegian coast, the tidal wave was at least 10-12 meters above sea level. Also on the Shetland Islands , a tidal wave more than 20 meters high was detected on the basis of deposits. The sinking of the Dogger Bank , the last island left from Doggerland , was completed in the process. Depending on the region in which such large submarine slides occur, the resulting tidal waves can cause considerable damage to coasts.

With a length of over 800 km and a volume of around 5600 km³, it is one of the largest landslides known worldwide .

literature

• BJ Coles: Doggerland's Loss and the Neolithic . In: B. Coles, J. Coles, M. Schou Jorgensen (Eds.): Bog Bodies, Sacred Sites and Wetland Archeology, 12th Department of Archeology, University of Exeter: WARP (Wetland Archeology Research Project) Occasional Paper 1999, p 51-57.
• Bernhard Weninger, Rick Schulting, Marcel Bradtmöller, Lee Clare, Mark Collard, Kevan Edinborough, Johanna Hilpert, Olaf Jöris, Marcel Niekus, Eelco J. Rohling, Bernd Wagner: The catastrophic final flooding of Doggerland by the Storegga Slide tsunami. In: Documenta Praehistorica. Vol. 35, 2008, doi: 10.4312 / dp.35.1 .

Individual evidence

1. ^ H. Haflidason, R. Lien, HP Sejrup, CF Forsberg, P. Bryn: The dating and morphometry of the Storegga Slide. In: Marine and Petroleum Geology. B. 22, No. 1-2, 2005, pp. 123-136, doi: 10.1016 / j.marpetgeo.2004.10.008 (alternative full text access : ResearchGate ).
2. ↑ Jürgen Mienert, Maarten Vanneste, Stefan Bünz, Karin Andreassen, Haflidi Haflidason, Hans Petter Sejrup: Ocean warming and gas hydrate stability on the mid-Norwegian margin at the Storegga Slide. In: Marine and Petroleum Geology. Vol. 22, No. 1–2, 2005, pp. 233–244, doi: 10.1016 / j.marpetgeo.2004.10.018 .
3. ↑ Bernhard Weninger, Rick Schulting, Marcel Bradtmöller, Lee Clare, Mark Collard, Kevan Edinborough, Johanna Hilpert, Olaf Jöris, Marcel Niekus, Eelco J. Rohling, Bernd Wagner: The catastrophic final flooding of Doggerland by the Storegga Slide tsunami. In: Documenta Praehistorica. Vol. 35, 2008, doi: 10.4312 / dp.35.1 .
4. ↑ ^{a b} M. Latif: Climate Change and Climate Dynamics . Ulmer Verlag, 2009, p. 180 f.

Coordinates: 64 °  N , 0 °  E