Abstract
Geophysical, geotechnical and hydrological surveys were conducted in the French Alps on a small landslide in black marl material to assess the stability. The geophysical survey, consisting of electromagnetic, geo-electric and relative differences in water content. The data on the basal slip surface, together with geotechnical parameters (cohesion and angle of internal friction), were used to make a stability analysis. This analysis revealed that a groundwater level of 4 m below the ground surface is the critical threshold for reactivating the landslide. The hydrological investigation, which entailed measurements of saturated permeability and pressure heads, indicated that instability depended on long-term wet conditions with little evapotranspiration.
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