We propose a passive MT experiment centred on the location where earthquake swarms occur and mofette fields are observed. The major objectives are (i) imaging the regional electrical conductivity on crustal scale, including tectonic features such as fault zones, (ii) providing a site characterization for drilling locations, (iii) studying the behavior of rocks and fluids from the surface down to the source region of earthquake swarms, (iv) imaging fluid pathways, their hydraulic properties and their interconnection, in particular in relation to mofette fields (v) investigate existence and characteristics of possible lower crustal magmatic sources.