Radiocarbon dating of east america lake levels what does ohac mean on dating sites

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), AB(International Centre for Geohazards, Norwegian Geotechnical Institute, P. Box 3930 Ullevaal Stadion, Oslo, 0806 Norway ;), AC(International Centre for Geohazards, Norwegian Geotechnical Institute, P. Box 3930 Ullevaal Stadion, Oslo, 0806 Norway ;), AD(Department of Marine Biotechnology, Norwegian College of Fishery Science, University of Tromsoe, Tromsoe, 9037 Norway ;), AE(Department of Geology, University of Tromsoe, Dramsvegen 201, Tromsoe, 9037 Norway ;) One of the largest Holocene landslide mapped on Earth is the Storegga Slide offshore Norway.

Between 25 km3 material were mobilized in a retrogressive process, generating a huge tsunami dated to about 7300 14C years BP, or ca 8100 calendar years BP.

Such a comparison between observations and simulations help us to estimate important parameters for the slide; the initial acceleration, the maximum velocity, and the mass mobilization time during the slide process.

Best fit between field observations and simulations is obtained for a retrogressive slide having a maximum velocity below 35 m/s, probably around 25- 30 m/s.

The average difference between a radiocarbon date of a terrestrial sample such as a tree, and a shell from the marine environment is about 400 radiocarbon years (see Stuiver and Braziunas, 1993).

This apparent age of oceanic water is caused both by the delay in exchange rates between atmospheric CO2 and ocean bicarbonate, and the dilution effect caused by the mixing of surface waters with upwelled deep waters which are very old (Mangerud 1972).

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We compared the field observations of run-up heights with maximum surface elevations from new numerical simulations of the Storegga slide generated tsunami.A reservoir correction must therefore be made to any conventional shell dates to account for this difference.Reservoir corrections for the world oceans can be found at the Marine Reservoir Correction Database, a searchable database online at Queen's University, Belfast and the University of Washington.Spurious radiocarbon dates caused by volcanic emanations of radiocarbon-depleted CO2 probably also come under the category of reservoir corrections.Plants which grow in the vicinity of active volcanic fumeroles will yield a radiocarbon age which is too old. (1980) measured the radioactivity of modern plants growing near hot springs heated by volcanic rocks in western Germany and demonstrated a deficiency in radiocarbon of up to 1500 years through comparison with modern atmospheric radiocarbon levels.

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