ABSTRACT
Indeed the problem of the potential evolution of landslide movements with new climatic conditions can be dealt with in two different perspectives:
– A first approach leads to determine the real evolution of the movements of a set of large landslides, on which landmarks have been surveyed for about a century or more, with the corresponding evolution of the annual rainfall conditions in the area, considering that only a major trend in the precipitation amount may cause a significant increase in the average velocities of the landslide mass. It has been showed that a slight acceleration can be observed for slides covering 1 km2 or less in the regions where a notable rainfall increase has been recorded in the second half of the XXth century; however, for larger slides (with an area of several km2 and up to 45 km2), the acceleration is minimal when a slight long-term rainfall increase is observed to nil when no rainfall increase is recorded (Noverraz et al., 1998).
