Horizontal slices through the P-wave velocity model of the Mauléon region (Villaseñor et al., 2019): (a) layer between 2 and 2.4 km depth, and (b) layer between 11.6 and 12 km depth. Open blue triangles are stations used in the tomography. Small circles are earthquakes with focal depth inside the layer. Velocities are shown as perturbation in percentage with respect to P-wave velocity in the initial model.