Sedimentary evidence for a mid-Holocene iceberg-generated tsunami in a coastal lake, west Greenland

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dc.contributor.authorLong, Antony J.
dc.contributor.authorSzczuciƄski, Witold
dc.contributor.authorLawrence, Thomas
dc.date.accessioned2016-06-16T12:26:51Z
dc.date.available2016-06-16T12:26:51Z
dc.date.issued2015-12
dc.description.abstractWe report sedimentological evidence for a tsunami from a coastal lake at Innaarsuit, Disko Bugt (west Greenland), which was most likely generated by a rolling iceberg. The tsunami invaded the lake c. 6000 years ago, during a period of time when relative sea level (RSL) was falling quickly because of isostatic rebound. We use the background rate of RSL fall, together with an age model for the sediment sequence, to infer a minimum wave run-up during the event of c. 3.3 m. The stratigraphic signature of the event bears similarities to that described from studies of the early-Holocene Storegga slide tsunami in Norwegian coastal basins. Conditions conducive to iceberg tsunami include a supply of icebergs, deep water close to the shore, a depositional setting protected from storms or landslide tsunami, and a coastal configuration that has the potential to amplify the height of tsunami waves as water depths shallow and the waves approach and impact the coast. Future warming of polar regions will lead to increased calving and iceberg production, at a time when human use of polar coasts will also grow. We predict, therefore, that iceberg-generated tsunami will become a growing hazard in polar coastal waters, especially in areas adjacent to large, fast-flowing, marine-terminating ice streams that are close to human populations or infrastructure.pl_PL
dc.description.sponsorshipPolish National Science Centre grant No. 2011/01/B/ST10/01553; NERC ARCICE thematic programme (GST022189); NERC Radiocarbon Dating Allocation No. 836.1299.pl_PL
dc.identifier.citationArktos vol. 1: 6, 2015, 16 pagespl_PL
dc.identifier.issn2364-9453
dc.identifier.urihttp://hdl.handle.net/10593/14733
dc.language.isoengpl_PL
dc.rightsinfo:eu-repo/semantics/openAccesspl_PL
dc.subjectIcebergpl_PL
dc.subjecttsunamipl_PL
dc.subjectisolation basinpl_PL
dc.subjectcoastal lakepl_PL
dc.subjectrelative sea levelpl_PL
dc.subjectnatural hazardpl_PL
dc.subjectGreenlandpl_PL
dc.subjectArcticpl_PL
dc.subjectlake sedimentspl_PL
dc.subjecttsunami depositspl_PL
dc.subjectdiatomspl_PL
dc.subjectgeohazardspl_PL
dc.titleSedimentary evidence for a mid-Holocene iceberg-generated tsunami in a coastal lake, west Greenlandpl_PL
dc.typeArtykuƂpl_PL

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