Why so few? Landslides triggered by the 2002 Denali earthquake, Alaska

Tolga Gorum*, Oliver Korup, Cees J. van Westen, Mark van der Meijde, Chong Xu, Freek D. van der Meer

*Bu çalışma için yazışmadan sorumlu yazar

Araştırma sonucu: ???type-name???Makalebilirkişi

95 Atıf (Scopus)

Özet

The 2002 Mw 7.9 Denali Fault earthquake, Alaska, provides an unparalleled opportunity to investigate in quantitative detail the regional hillslope mass-wasting response to strong seismic shaking in glacierized terrain. We present the first detailed inventory of ~1580 coseismic slope failures, out of which some 20% occurred above large valley glaciers, based on mapping from multi-temporal remote sensing data. We find that the Denali earthquake produced at least one order of magnitude fewer landslides in a much narrower corridor along the fault ruptures than empirical predictions for an M ~8 earthquake would suggest, despite the availability of sufficiently steep and dissected mountainous topography prone to frequent slope failure. In order to explore potential controls on the reduced extent of regional coseismic landsliding we compare our data with inventories that we compiled for two recent earthquakes in periglacial and formerly glaciated terrain, i.e. at Yushu, Tibet (Mw 6.9, 2010), and Aysén Fjord, Chile (2007 Mw 6.2). Fault movement during these events was, similarly to that of the Denali earthquake, dominated by strike-slip offsets along near-vertical faults. Our comparison returns very similar coseismic landslide patterns that are consistent with the idea that fault type, geometry, and dynamic rupture process rather than widespread glacier cover were among the first-order controls on regional hillslope erosional response in these earthquakes. We conclude that estimating the amount of coseismic hillslope sediment input to the sediment cascade from earthquake magnitude alone remains highly problematic, particularly if glacierized terrain is involved.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)80-94
Sayfa sayısı15
DergiQuaternary Science Reviews
Hacim95
DOI'lar
Yayın durumuYayınlandı - 1 Tem 2014
Harici olarak yayınlandıEvet

Finansman

This work was supported by the United Nations University – ITC Center for Spatial Analysis for Disaster Risk Management ( www.itc.nl/unu-drm ). O.K. acknowledges support by the Potsdam Research Cluster for Georisk Analysis, Environmental Change and Sustainability (PROGRESS). We thank Tim Davies, John Clague, and Alexander Strom for their instructive and thought-provoking comments on an earlier version of this manuscript.

FinansörlerFinansör numarası
PROGRESS
Potsdam Research Cluster for Georisk Analysis, Environmental Change and Sustainability
United Nations University

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