Open Session - SWISS GEOSCIENCE MEETINGs

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Symposium 9: Natural Hazards and Risks
Figure 1. Mean level variations of SSH along 6 passes in Caspian Sea.
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The Deep Seated Gravitational Slope Deformation of Landarenca
(Graubünden, Switzerland): A Geological-Geotechnical Analysis
Fossati David*, Kos Andrew*
*Group of Engineering Geology, Geological Institute, Wolfgang-Pauli-Str. 15, 8093 Zürich (fossatid@student.ethz.ch)
A complex deep seated gravitational slope deformation (DSGSD) located in the south western part of the Calanca valley
(Graubünden, Switzerland), in the area of Landarenca will be described using an multi-disciplinary approach, where field
surveys, remote sensing and geodetic measurements are applied to the site for the first time. The DSGSD lies within isoclinally
folded gneisses and mica schists of the Adula and Simano nappes. Geomorphologic features such as terraces, steep rock
cliffs, tension cracks, scarps, counterscarps and combined scarp-tension crack structures characterize the area. The area of
the DSGSD involves at least 1 square kilometre with an approximate volume of 185 million cubic meters. An integration of
results indicate the DSGSD to be slightly active with velocities of up to 8mm per year. Movements involve discontinuous
creeping, i.e. a combination of creeping and sliding and the DSGSD can be defined as a slightly active, deep seated kink band
slumping, in a developed stage.
REFERENCES
Amann, F. 2006: Grosshangbewegung Cuolm da Vi (Graubünden, Schweiz) – geologisch-geotechnische Befunde und
numerische Untersuchungen zur Klärung des Phänomens. Diss. Univ. Erlangen-Nürnberg.
Agliardi, F., Crosta, G. & Zanchi, A. 2001: Structural constraints on deep-seated slope deformation kinematics. Eng. Geol. 59
(1-2), 83-102.
Kieffer, D. S. 1998: Rock slumping: A compound failure mode of jointed hard rock slopes. PhD Thesis. University of
California, Berkeley.