Active structures and thermal state of the Piton de la Fournaise summit revealed by combined UAV magnetic and thermal infrared measurements

In this study, we demonstrate the strong potential of combining Unmanned Aerial Vehicle (UAV)-based thermal infrared (IR) and magnetic measurements to image state volcanic edifices, as well distribution active volcano-tectonic features at depth. Since magnetization is strongly dependent on temperature alteration, thermally structures are also associated with a decrease in magnetization. Based analysis recent combined acquisitions, focus evolution summit activity Piton de la Fournaise. The comparison clearly highlights zones major activity, alteration high permeability, potentially areas low mechanical resistance. Those observations provide information preferential pathways for future constraints fluid transfer, diffusion, cooling processes occurring within volcano subsurface. Through reiterations, such UAV therefore particularly relevant monitoring hazards before, during after eruptions.