Distinction between the Storegga tsunami and the holocene marine transgression in coastal basin deposits of western Norway

Bondevik, Stein; Svendsen, John Inge; Mangerud, Jan

doi:10.1002/(sici)1099-1417(1998110)13:6<529::aid-jqs388>3.0.co;2-1

Cited by 48 publications

(27 citation statements)

References 19 publications

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“…Along the Norwegian coast a number of well-documented sea-level curves have been constructed (Kaland, 1984;Anundsen, 1985;Kjemperud, 1986;Svendsen and Mangerud, 1987;Bondevik et al, 1998). Because of uplift due to glacial unloading of Fennoscandia the 7300 14 C yr BP shorelines are tilted and found above the present sea level.…”

Section: Reconstructing the Run-up From Tsunami Depositsmentioning

confidence: 99%

The Storegga Slide tsunami—comparing field observations with numerical simulations

Bondevik

Løvholt

Harbitz

et al. 2005

Marine and Petroleum Geology

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Section: Reconstructing the Run-up From Tsunami Depositsmentioning

confidence: 99%

The Storegga Slide tsunami—comparing field observations with numerical simulations

Bondevik

Løvholt

Harbitz

et al. 2005

Marine and Petroleum Geology

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239

161

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“…Several older reconstructions of sea-level curves from Lista are shown in Fig. The inter-pretation was the subject of debate (Hafsten 1983;Kaland 1984) and the records at Bømlo were later shown to be a result of inundation by the Storegga tsunami prior to the (single) Tapes transgression (Bondevik et al 1997a(Bondevik et al , 1998. Whereas our curve shows one transgression followed by regression until today, the other curves depict a more complex course of shoreline displacement, with several transgressions and regressions.…”

Section: Multiple Holocene Transgressions?mentioning

confidence: 81%

A Holocene sea‐level curve and revised isobase map based on isolation basins from near the southern tip of Norway

Romundset

Fredin

Høgaas

2014

Boreas

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2015 (April): A Holocene sea-level curve and revised isobase map based on isolation basins from near the southern tip of Norway.We report a new Holocene relative sea-level curve based on the stratigraphy in five closely located isolation basins near Lista in southernmost Norway. The results detail the progress and timing of the mid-Holocene Tapes transgression, the peak of which in this region represents the highest postglacial sea level, as well as the rate of land emergence since then. One additional cored basin is situated above the marine limit. All the basins have bedrock sills that were levelled using a differential GPS. Isolation and ingression boundaries were identified by macrofossil analysis and radiocarbon dated on terrestrial plant remains. In most cases several dates were obtained from each transition. Relative sea level rose with a mean rate of 7 mm a −1 during the last part of the Tapes transgression 8600−8200 cal. a BP and then gradually slowed to a mean rate of 1 mm a −1 from 8200−7000 cal. a BP. Mean sea level reached ∼5 m higher than the present level when the transgression culminated. Land emergence took place after this, first slowly at a mean rate of 0.4 mm a −1 until ∼3900 cal. a BP before it increased to 2.6 mm between 3900 and 3400 cal. a BP. Since then it has slowly decreased until today and has been ∼0.2 mm a −1 for the last 2000 years. Based on the new curve we present updated Tapes isobases for the region that are displaced by ∼20 km in relation to the existing model. From one basin we also report a 5-10 cm thick layer of sorted, sandy gravel, embedded in a more than 5-m-thick deposit of homogeneous shallow-marine mud. The gravel was deposited ∼5500 cal. a BP, which is the same age as a tsunami deposit previously mapped in Shetland. As several typical characteristics of tsunami facies deposits are lacking, the origin of the gravel layer remains inconclusive. The age of boundaries between marine and lacustrine segments of the basin stratigraphy signify times when the sea level fell below or rose above the elevation of the bs_bs_banner

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“…Up-core towards left. (Svendsen & Mangerud 1987;Bondevik et al 1998). According to this, the regression minimum was reached at c. 9000 yr BP at a sea level of À7 m a.s.l.…”

Section: Resultsmentioning

confidence: 99%

“…In most of the coastal areas where Storegga tsunami deposits have been identified, both a rise in relative sea level, called the Tapes transgression, and the Storegga tsunami occurred at the same time. In fact, many of the deposits inferred previously to be Tapes transgression sediments in Norway (Faegri 1944;Kaland 1984;Svendsen & Mangerud 1990) are Storegga tsunami deposits (Bondevik et al 1998).…”

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confidence: 97%

Storegga tsunami sand in peat below the Tapes beach ridge at Harøy, western Norway, and its possible relation to an early Stone Age settlement

Bondevik

2003

Boreas

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Storegga tsunami sand in peat below the Tapes beach ridge at Harøy, western Norway, and its possible relation to an early Stone Age settlement STEIN BONDEVIK Bondevik, S. 2003 (September): Storegga tsunami sand in peat below the Tapes beach ridge at Harøy, western Norway, and its possible relation to an early Stone Age settlement. Boreas, Vol. 32, pp. 476-483. Oslo. ISSN 0300-9483.One of the early problems with the Storegga tsunami deposit was how to distinguish it from deposits of the mid-Holocene (Tapes) transgression. An excavation on Harøy, an island on the outermost western coast of Norway, shows a distinct, clean sand bed embedded in peat and clearly separated from the overlying Tapes beach deposits. This sand bed continues in the peat landwards of the beach ridge for at least 60 m. Radiocarbon dates of the peat show that the sand was deposited some time between 6900 and 7700 yr BP. The sedimentary structures of the bed, the 14 C dates, and the fact that this is the only sand bed in the peat, suggest that the sand bed was deposited by a short-lived event, the Storegga tsunami. On the neighbouring island, Fjørtoft, a Stone Age settlement, dated to 7500 yr BP, was discovered in the early 1970s. The settlement was found underneath a sand bed that later had been covered by the Tapes beach ridge deposits. When discovered, the sand covering the settlement was inferred as eolian sand. However, this investigation shows that the Storegga tsunami deposited a widespread sand bed on the land surface around this time with a similar grain size distribution to eolian sand. It is therefore suggested that the sand bed covering this settlement was deposited from the Storegga tsunami. Both the stratigraphy and 14 C dates demonstrate that the Tapes transgression maximum was reached well after the Storegga tsunami on Harøy, between 6500 and 6100 yr BP.

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Distinction between the Storegga tsunami and the holocene marine transgression in coastal basin deposits of western Norway

Cited by 48 publications

References 19 publications

The Storegga Slide tsunami—comparing field observations with numerical simulations

The Storegga Slide tsunami—comparing field observations with numerical simulations

A Holocene sea‐level curve and revised isobase map based on isolation basins from near the southern tip of Norway

Storegga tsunami sand in peat below the Tapes beach ridge at Harøy, western Norway, and its possible relation to an early Stone Age settlement

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