Journal
HOLOCENE
Volume 17, Issue 6, Pages 707-716Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0959683607080510
Keywords
Fjord; slope failures; trigger mechanisms; environmental change; seismic data; swath bathymetry; mass transport; Holocene
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The analyses of high-resolution seismic data, swath bathymetry data and sediment cores from the basin Svensksunddjupet in IsfJorden, Spitsbergen, reveal the deposits of repeated slope failures. Most of the slope failures occurred during three periods at c. 9650 cal. BP, 8350-8200 cal. BP and 3000 cal. BP. Suggested factors causing instability of the slopes include earthquake activity resulting from rapid isostatic uplift, excess pore pressure caused by relative sea-level fall and/or the presence of gas as well as climatic changes. Mass-transport deposits at the mouth of an incision at the southern slope of Svensksunddjupet are suggested to mainly relate to runoff from the land-based glacier Vardebreen. The increase of the mass-transport activity may indicate that Vardebreen either formed or increased in size at c. 7000 cal. BP.
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