Airborne Electromagnetics to Improve Landslide Knowledge in Tropical Volcanic Environments

Caribbean areas are particular volcanic territories in tropical environments. These juxtapose several landslide-prone with different predisposing factors (poorly consolidated materials, superimposition of healthy materials on highly weathered high heterogeneity thicknesses, etc.). In these environments, where rapid development slopes and land use changes noticeable, it is necessary to better characterize unstable phenomena that cause damage infrastructure people. This characterization has be carried out the as well initiation conditions requires complementary investigations. study, focusing La Martinique, proposes a landslide analysis methodology combines new information about acquired by an airborne electromagnetics survey physical-based model. Once data interpreted compared field observations previous data, geological model produced introduced into physical test instability scenarios. The results show geophysical investigations (i) improve knowledge internal structure landslides surficial formations, (ii) specify spatial limits sensitive landslides, (iii) give understanding conditions, particularly hydrogeological triggering conditions.