We aim at improving our knowledge regarding slow-moving landslide evolution processes by means of passive seismic methods. Seismic arrays have been installed on two landslides (Super-Sauze, France and Valoria, Italy). We detect, locate and characterise three main types of seismic signals. One type corresponds to the regional earthquakes and is also external to the dynamics of the landslides. The two others are located into clusters close to fractured or scarp zones. The first type is interpreted as rock falls or brittle material propagating along the slide, while the second type is interpreted as fracture or shearing phenomena. We evaluate that displacements and precipitations might be correlated with seismic signals variations. Landslides are likely to move and to mechanically change in space and time, which implies a continuous monitoring of the seismic equipment and prevents from long-term acquisition.
