Research Activities Plumbing system of a volcanic island (Miyakejima, Japan) 3-D Electrical Resistivity Tomography of an ancien meander (Vallon-Pont-d’Arc, France) 3-D Electrical Resistivity Tomography of the Solfatara Crater (Campi Flegrei, Italy) 3-D Electrical Resistivity Tomography of a lava lake (Hawaii, USA) Anatomy of a fumarolic system (Campi Flegrei, Italy) Changes in CO2 diffuse degassing induced by seismic waves