Article (Scientific journals)
On the origin of late Quaternary palaeolandslides in the Liège (E Belgium) area
Demoulin, Alain; Pissart, Albert; Schroeder, C.
2003In International Journal of Earth Sciences, 92 (5), p. 795-805
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Keywords :
E Belgium; Geophysical investigation; Landslide; Palaeoseismicity; Slope stability; Quaternary; Belgium; Benelux; Eurasia; Europe; Liege [Belgium]; Western Europe
Abstract :
[en] A series of palaeolandslides is described in eastern Belgium, with geophysical investigations, trench analysis and a number of 14C dates complementing the field description. The proposed sliding mechanism stresses the importance of initial liquefaction of the upper Cretaceous Aachen sands underlying the ∼30-m-thick Vaals Clay Formation, in which all landslides are developed. Slope-stability analyses support the hypothesis of sudden landsliding and yield further useful information to discuss their origin. A main difficulty in determining the landslide trigger arises from insufficient absolute dates. Assuming that all landslides occurred simultaneously, we weigh the probabilities, respectively, of a climatic and a seismic trigger. Although the 150 A.D. possible date of landslide initiation falls close to one of the wettest periods of the Holocene, the spatial distribution of the deep slides and their proposed mechanism strongly suggest a seismic origin in connection with a rupture of the nearby Ostend segment of the active Hockai fault zone. However, considering that the nearby 1692, Verviers earthquake apparently caused no ground failure, it is probable that both the climatic and seismic triggers were jointly needed to provoke such deep and extended landsliding on moderate, generally stable slopes. © Springer-Verlag 2003.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Demoulin, Alain ;  Université de Liège - ULiège > Département de géographie > Unité de géographie physique et quaternaire (UGPQ)
Pissart, Albert ;  Université de Liège - ULiège
Schroeder, C.;  Dept. GeomaC, Lab Appl. Geol. Hydrogeology/Geophys, University of Liège, Sart Tilman, B18, Liège 4000, Belgium
Language :
English
Title :
On the origin of late Quaternary palaeolandslides in the Liège (E Belgium) area
Publication date :
2003
Journal title :
International Journal of Earth Sciences
ISSN :
1437-3254
eISSN :
1437-3262
Publisher :
Springer, Berlin, Germany
Volume :
92
Issue :
5
Pages :
795-805
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
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