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Poster (Scientific congresses and symposiums)
Integrated geological-geophysical models of unstable slopes in seismogenic areas in NW and SE Europe
Mreyen, Anne-Sophie; Micu, Mihai; Onaca, Alexandru et al.
2017EGU General Assembly
 

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Keywords :
seismic landslides; Hockai Fault Zone; Vrancea-Buzau
Abstract :
[en] We will present a series of new integrated 3D models of landslide sites that were investigated in distinctive seismotectonic and climatic contexts: (1) along the Hockai Fault Zone in Belgium, with the 1692 Verviers Earthquake (M 6 - 6.5) as most prominent earthquake that occurred in that fault zone and (2) in the seismic region of Vrancea, Romania, where four earthquakes with Mw > 7.4 have been recorded during the last two centuries. Both sites present deep-seated failures located in more or less seismically active areas. In such areas, slope stability analyses have to take into account the possible contributions to ground failure. Our investigation methods had to be adapted to capture the deep structure as well as the physico-mechanical characteristics that influence the dynamic behaviour of the landslide body. Field surveys included electrical resistivity tomography profiles, seismic refraction profiles (analysed in terms of both seismic P-wave tomography and surface waves), ambient noise measurements to determine the soil resonance frequencies through H/V analysis, complemented by geological and geomorphic mapping. The H/V method, in particular, is more and more used for landslide investigations or sites marked by topographic relief (in addition to the more classical applications on flat sites). Results of data interpretation were compiled in 3D geological-geophysical models supported by high resolution remote sensing data of the ground surface. Data and results were not only analysed in parallel or successively; to ensure full integration of all inputs-outputs, some data fusion and geostatistical techniques were applied to establish closer links between them. Inside the 3D models, material boundaries were defined in terms of surfaces and volumes. Those models were used as inputs for 2D dynamic numerical simulations completed with the UDEC (Itasca) software. For some sites, a full back-analysis was carried out to assess the possibility of a seismic triggering of the landslides.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Mreyen, Anne-Sophie  ;  Université de Liège - ULiège > Département de géologie > Géologie de l'environnement
Micu, Mihai;  Romanian Academy of Bucharest > Institute of Geography
Onaca, Alexandru
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 :
Integrated geological-geophysical models of unstable slopes in seismogenic areas in NW and SE Europe
Publication date :
April 2017
Number of pages :
A0
Event name :
EGU General Assembly
Event organizer :
Copernicus.org
Event place :
Vienna, Austria
Event date :
23-04-2017 to 28-04-2017
Audience :
International
Available on ORBi :
since 21 November 2017

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