Geophysical signatures of volcano geothermal systems.
Currenti G., Napoli R.
We present a multi-parametric numerical model (hydrological, thermal, mechanical) to determine the response of ground deformation, gravity and magnetic field to the characteristics of a geothermal system and to its dynamic. These different geophysical observables are jointly evaluated as a consequence of a hydrothermal unrest at Vulcano Island and their spatio-temporal evolution is investigated as the description of the volcanic island becomes more realistic, focusing on the topography, the heterogeneous structure and the hydrological properties. A generic unrest of 1 year engenders on the ground surface low-amplitude changes in the investigated geophysical observables, that, however, could be detected by monitoring networks equipped with modern state-of-the-art instruments. Devising easy-to-use computational experiments enables us to learn how the hydrothermal system responds to un unrest and which fingerprints it may leave in the geophysical signals.