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dc.contributor.authorHilger, Paula
dc.contributor.authorHermanns, Reginald
dc.contributor.authorGosse, John C
dc.contributor.authorJacobs, B
dc.contributor.authorEtzelmüller, Bernd
dc.contributor.authorKrautblatter, Michael
dc.date.accessioned2019-02-20T12:12:10Z
dc.date.available2019-02-20T12:12:10Z
dc.date.created2019-01-10T11:10:17Z
dc.date.issued2018
dc.identifier.citationThe Holocene. 2018, 28 (12), 1841-1854.nb_NO
dc.identifier.issn0959-6836
dc.identifier.urihttp://hdl.handle.net/11250/2586526
dc.description.abstractOversteepened valley walls in western Norway have high recurrences of Holocene rock-slope failure activity causing significant risk to communities and infrastructure. Deposits from six to nine catastrophic rock-slope failure (CRSF) events are preserved at the base of the Mannen rock-slope instability in the Romsdal Valley, western Norway. The timing of these CRSF events was determined by terrestrial cosmogenic nuclide dating and relative chronology due to mapping Quaternary deposits. The stratigraphical chronology indicates that three of the CRSF events occurred between 12 and 10 ka, during regional deglaciation. Congruent with previous investigations, these events are attributed to the debuttressing effect experienced by steep slopes following deglaciation, during a period of paraglacial relaxation. The remaining three to six CRSF events cluster at 4.9 ± 0.6 ka (based on 10 cosmogenic 10Be samples from boulders). CRSF events during this later period are ascribed to climatic changes at the end of the Holocene thermal optimum, including increased precipitation rates, high air temperatures and the associated degradation of permafrost in rock-slope faces. Geomorphological mapping and sedimentological analyses further permit the contextualisation of these deposits within the overall sequence of post-glacial fjord-valley infilling. In the light of contemporary climate change, the relationship between CRSF frequency, precipitation, air temperature and permafrost degradation may be of interest to others working or operating in comparable settings.nb_NO
dc.language.isoengnb_NO
dc.publisherSAGE Publicationsnb_NO
dc.titleMultiple rock-slope failures from Mannen in Romsdal Valley, western Norway, revealed from Quaternary geological mapping and 10Be exposure datingnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber1841-1854nb_NO
dc.source.volume28nb_NO
dc.source.journalThe Holocenenb_NO
dc.source.issue12nb_NO
dc.identifier.doi10.1177/0959683618798165
dc.identifier.cristin1653886
dc.description.localcode© 2018. This is the authors' accepted and refereed manuscript to the article. The final authenticated version is available online at: https://journals.sagepub.com/doi/10.1177/0959683618798165nb_NO
cristin.unitcode194,64,90,0
cristin.unitnameInstitutt for geovitenskap og petroleum
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1


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