Imaging of CROP 18 deep crustal data

The re-processing and tomographic inversion of seismic reflection data acquired in southern Tuscany gave an accurate geometric model of the crustal structures in the region of the world-famous geothermal fields of Larderello and Monte Amiata. Accurate velocity analysis and the tomographic velocity model, computed down to 8 km depth, defined a complex geological structure with large horizontal and vertical structural and petrophysical variations. Highamplitude reflectors at intermediate crustal levels, brighter than the previously recognised K-horizon, the principal marker of the investigated area according to the literature, are clearly imaged on either side of the two main crustal domes, corresponding to the Larderello and Monte Amiata geothermal fields. Pre-stack depth migration was used to determine, iteratively, the deepest velocity model and to improve the seismic imaging of the structures.