Fig. 1: Tectonic setting of Italy and vertical cross-sections of model Im25.
a Map of the main tectonic and structural features of the Italian region (modified after3); deformation rates6 are denoted by colored arrows (see legend). Relocated seismicity from the Italian Bulletin of INGV85 is represented by the dots, colored by earthquake depth. Isolines indicate the deepening of the Ionian slab86. The light red areas indicate volcanic provinces. b Vertical sections of the Im25 Vp model visualized in 3D; coastlines are plotted on top of the slices. See inset for a map view. c Corresponding vertical sections for the Im25 Vs model. The inset shows earthquakes (dots) and stations (triangles) used in this study. Red dots are the 123 events considered for the first 12 iterations, blue dots denote 40 events added at the 13th iteration. Grey lines indicate a schematic representation of plate boundaries at Moho depth (modified after6,29,87,88). The dashed line in the Adriatic Sea represents the theoretical separation between the two microplates that compose the Adriatic plate6.
