Recent studies show that casualties due to mass-movements reach almost 10000 people/year. Triggering of these instabilities are driven by various natural (rainfall, earthquakes, deglaciation) and anthropogenic factors. Understanding the mechanims of deformation of the landslides and the factors controlling the triggering of the landslides are the central points of my research. To achieve these aims, my research focus on the monitoring of slow-moving landslides in various tectonic and climatic environments (Peru, Nepal, France, Iran, Liban, Island) by the coupling of remote sensing images, GNSS and seismic monitoring.