Pascal Lacroix (Université Grenoble Alpes)




Doua, Fontannes


Life and death of slow-moving landslides

In the most destructive and catastrophic landslide events, rocks, soil and fluids can travel at speeds approaching several tens of metres per second. However, many landslides, commonly referred to as slow-moving landslides, creep at rates ranging from millimetres to several metres per year and can persist for years to decades. Slow-moving landslides are highly erosive features that control the landscape morphology in many mountainous regions. The persistent and long-term motion of slow-moving landslides also provides an exceptional opportunity to investigate landslide processes and mechanisms. Based on a combination of satellite images analysis, and in situ seismic, geodetic, and hydrologic monitoring, I will analyse the processes associated with some of the forcings (earthquakes, rainfalls, glacier retreat) that drive their motion. I will then show the value of new satellite constellations for detecting landslides and their possible acceleration, which can even lead to catastrophic failures.  Finally, I will discuss the potential of these satellites for landslide time-of-failure prediction.