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Geographica Helvetica
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Volume 61, issue 3
Geogr. Helv., 61, 201–208, 2006
https://doi.org/10.5194/gh-61-201-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.
Geogr. Helv., 61, 201–208, 2006
https://doi.org/10.5194/gh-61-201-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Sep 2006

30 Sep 2006

Subsurface investigations of landslides using geophysical methods : geoelectrical applications in the Swabian Alb (Germany)

R. Bell1, J.-E. Kruse1, A. Garcia2, T. Glade1, and A. Hördt R. Bell et al.
  • 1Geographisches Institut, Universität Bonn, Meckenheimer Allee 166, 53115 Bonn, Germany
  • 2Institut für Geologie, Fachbereich Geophysik, Universität Bonn, Nussallee 8, 53115 Bonn, Germany
  • Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstrasse 3, 38106 Braunschweig, Germany

Abstract. Landslides occur frequently all over the world, causing at times considerable economic damage, injuries and even death. In order to improve hazard assessment, common landslide types of a given region need to be investigated in detail. While traditional techniques of subsurface investigation are expensive and only provide point information, geophysical methods are suitable tools for gathering 2D and 3D information on the subsurface quickly, reliably and cost-effectively.

In this study, the suitability and limitations of 2D resistivity for the determination of landslide extent, structure and soil moisture conditions are presented. For this purpose, two identical profiles were taken during a two-month period. Significant differences in electrical resistivity (>1000 Ωm) due to varying soil moisture conditions were observed. Using various inversion parameters, it was possible to model two distinct subsurface images. Regrettably, the sliding plane could not be detected reliably, possibly due to the homogeniety of the landslide material and underlying bedrock.

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