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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 15, issue 1 | Copyright

Special issue: New observing strategies for monitoring natural and technological...

Nat. Hazards Earth Syst. Sci., 15, 135-146, 2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 20 Jan 2015

Research article | 20 Jan 2015

The influence of the grain-size, mineralogical and geochemical composition on the Verdesca landslide

V. Summa1, S. Margiotta1,2, R. Colaiacovo1, and M. L. Giannossi1 V. Summa et al.
  • 1Laboratory of Environmental & Medical Geology, CNR IMAA, C. da S. Loya, 85050, Tito Scalo, Potenza, Italy
  • 2Osservatorio Ambientale Val d'Agri, Via Vittorio Emanuele II, 3, 85052, Marsico Nuovo, Potenza, Italy

Abstract. Silty sands and clayey silts taken from a landslide in the Agri Valley have been analysed in order to study the role of sediment composition in the slope stability and the development of a slip zone. A geognostic hole was used to collect samples and monitor movements. A slip zone at a depth of about 14 m was identified. Compositional and physical–mechanical characterisation of samples was carried out. Some compositional characters, such as a 32–2 μm grain-size fraction, clay mineral content, cation exchange capacity and total nitrogen, increase in the slip zone. Some correlations have been found between geotechnical properties (residual shear strength and residual friction angle) and the same compositional characters, which can therefore be considered possible factors influencing slope stability.

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