Preferential fluids ascent paths revealed by coupling chemical, electrical and magnetic methods: insights for risk mitigation in a long-dormant volcanic province (Monts Dore, France) [Dataset]

This study focuses on the dormant volcanic province of the Monts Dore in France, and in particular, around the Lake Pavin, in order to identify the preferential pathways by which volcanic fluids (water, gas, magma) can ascend. By combining data on soil CO2 flux with geophysical information (magnetism, electrical resistivity tomography), fluid circulation routes were mapped. The results highlighted two potential sites of fluid emission likely to affect inhabited areas, since simulations of potential lava flow propagation were also carried out on the basis of the identification of these high permeability areas. As a result, potential risks maps were drawn up to show the feasibility of identifying exposed areas to natural hazards even in long-term quiescent volcanic provinces. This research provides new methodological elements in order to assess volcanic risk and develop an adapted urban planning in long-dormant volcanic areas as the Monts Dore.