Active tectonics and its interactions with Copahue volcano

The aim of this review is to describe the state-of-art of the neotectonic setting of this area as well as to present new data resulting from a recent structural field survey. The integrated analysis of literature and new structural data shows incongruities mainly in some regional structures and in the ENE-WSW striking fault system that affects and controls the feeding system of Copahue volcano. In addition, taking into account the very recent volcanic activity, the structural constraints and the earthquakes occurred in the area close to the volcano, a static stress numerical model was applied to simulate the variations of the local stress perturbing the normal activity of the volcanic plumbing system favouring magma ascent and consequent eruptions. At present, a comprehensive structural model is lacking and more in-depth studies can furnish a complete tectonic framework of the area, which can provide fundamental information to assess volcanic hazard, forecast future volcanic activity, and to enhance the development of the associated geothermal field.