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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
Geologica Belgica, 2018-01, Vol.21 (3-4), p.101-110
[Peer Reviewed Journal]
Geologica Belgica
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Title:
Seismotectonic activity in East Belgium: relevance of a major scarp and two associated landslides in the region of Malmedy
Author:
MREYEN, Anne-Sophie
;
DEMOULIN
,
Alain
;
HAVENITH, Hans-Balder
Subjects:
alte Massenbewegungen
;
analyse géomorphologique
;
anciens mouvements de masse
;
ancient mass movements
;
Earth sciences & physical geography
;
escarpement tectonique
;
geomorphological analysis
;
geomorphologische Analyse
;
Hockai Fault Zone
;
Hockai-Störungszone
;
LiDAR-DEM
;
LiDAR-DGM
;
LiSAR-DEM
;
MNT LiDAR
;
Physical, chemical, mathematical & earth Sciences
;
Physique, chimie, mathématiques & sciences de la terre
;
Sciences de la terre & géographie physique
;
seismic and electrical tomography
;
seismische und elektrische Tomopgraphie
;
Störungsausbiss
;
tectonic scarp
;
tomographie sismique et électrique
;
Zone de Faille de Hockai
Is Part Of:
Geologica Belgica, 2018-01, Vol.21 (3-4), p.101-110
Notes:
scopus-id:2-s2.0-85052824656
number 3-4
101-110
Volume 21 (2018)
Description:
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.
Publisher:
Geologica Belgica
Language:
English
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