Figure 7
From: The tectonic puzzle of the Messina area (Southern Italy): Insights from new seismic reflection data

Block diagram showing the geometry of the Apennines-Calabrian subduction zone, the differential advancement/retreat of the slab hinge relative to the Sardinia upper plate, in comparison with the Sicilian segment and the state of stress at the surface.
The Messina Strait area is located at the transfer zone where the two tectonic mechanisms partly overlap.