Article (Scientific journals)
Seismotectonic activity in East Belgium: relevance of a major scarp and two associated landslides in the region of Malmedy
Mreyen, Anne-Sophie; Demoulin, Alain; Havenith, Hans-Balder
2018In Geologica Belgica, 21 (3-4), p. 101-110
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Keywords :
Hockai Fault Zone; tectonic scarp; geomorphological analysis; LiSAR-DEM; seismic and electrical tomography; ancient mass movements
Abstract :
[en] Geomorphological markers such as scarps, river diversions and slope failures can be used as proxy indicators for the seismotectonic activity of a region. This study concentrates on the Malmedy-Bévercé area, E-Belgium, where formerly unknown geomorphological features have been recently discovered in the frame of a new regional geological mapping campaign. The area is characterised by gentle to locally very steep slopes along the Warche valley crossing the Stavelot Massif and the Malmedy Graben. Coupled with a LiDAR-DEM and UAV imagery analysis, field mapping has revealed a steep scarp extending near two landslides on the southern hillslopes of the Warche valley at Bévercé. These slope failures developed in the Permian conglomerates of the Malmedy Formation (also known as the Poudingue de Malmedy), which represent the infill of the Malmedy Graben. Roughly perpendicular to the graben axis, the scarp has a N330°E orientation similar to that of the seismotectonically active Hockai Fault Zone that crosses the Malmedy region in this area. In this paper, we present the geological and geomorphological context of the Bévercé scarp and of the largest landslide. Furthermore, we demonstrate the results of a geophysical reconnaissance survey of the structures (seismic refraction and electrical resistivity profiling). The geophysical results highlight a vertical displacement of the seismic layers and laterally changing electrical properties across the scarp, with very low resistivity values in its middle part. A low resistivity zone in the subsurface can also be found within the larger landslide, right in the prolongation of the scarp. All these observations hint at the presence of a major, probably seismically active, fault belonging to the eastern border of the Hockai Fault Zone.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Mreyen, Anne-Sophie  ;  Université de Liège - ULiège > Département de géologie > Géologie de l'environnement
Demoulin, Alain ;  Université de Liège - ULiège > Département de géographie > Unité de géographie physique et quaternaire (UGPQ)
Havenith, Hans-Balder  ;  Université de Liège - ULiège > Département de géologie > Géologie de l'environnement
Language :
English
Title :
Seismotectonic activity in East Belgium: relevance of a major scarp and two associated landslides in the region of Malmedy
Alternative titles :
[en] Seismotectonic activity in the region of Malmedy - new insights
Publication date :
07 August 2018
Journal title :
Geologica Belgica
ISSN :
1374-8505
eISSN :
2034-1954
Publisher :
Geologica Belgica, Belgium
Volume :
21
Issue :
3-4
Pages :
101-110
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 13 August 2018

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