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Open image in new windowIntegrated Geological-Geophysical Models of Unstable Slopes in Seismic Areas

  • Anne-Sophie MreyenEmail author
  • Mihai Micu
  • Alexandru Onaca
  • Philippe Cerfontaine
  • Hans-Balder Havenith
Conference paper

Abstract

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 and (2) in the seismic region of Vrancea, Romania. Both sites are 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 were implemented in 2D and 3D numerical dynamic models (presented in a companion paper).

Keywords

Multiple investigation methods H/V Geomodelling Seismic landslides Fault zones 

Notes

Acknowledgements

Part of this work was supported by the WBI—Romanian Academy project ‘Evaluation des risques long-termes liés aux mouvements de masse déclenchés par les séismes dans la région de Vrancea, Roumanie’.

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Anne-Sophie Mreyen
    • 1
    Email author
  • Mihai Micu
    • 2
  • Alexandru Onaca
    • 3
  • Philippe Cerfontaine
    • 1
  • Hans-Balder Havenith
    • 1
  1. 1.Department of GeologyUniversity of LiegeLiegeBelgium
  2. 2.Romanian AcademyInstitute of GeographyBucharestRomania
  3. 3.Department of GeologyWest University of TimișoaraTimișoaraRomania

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