Fig. 3: Vertical cross-sections of models Im00 and Im25 for section HH’ and 3D visualization of Im25 Vp/Vs structure under Mt. Etna volcano.
The cross-sections are a continuation of Fig. 2 showing section HH' of Figs. 1b, c. The sub-figures a, b show a close-up of the area around Mt. Etna volcano (red triangle) in a block of 60 km x 63 km and 50 km depth. In (a) the block is seen from the top and in (b) in a 3D view; black segment in the map is the trace of the section on the right; black or white lines denote the Sicilian coast in the two sub-figures, respectively. Isovolumes represent the Vp/Vs Im25 model inside the block with orange denoting Vp/Vs = 1.95 and dark yellow denoting Vp/Vs = 2.2. A shallow, high Vp/Vs feature (2.2) is imaged right below the volcano and another high Vp/Vs isovolume (1.95) deepens southeastward below the Malta Escarpment.
