P-wave seismic tomography and lithosphere thickness variations across Western Europe. (a) P-wave velocities anomalies from global model UU-P07 (Amaru, 2007) along a section stretching between the East European Craton (Sweden) and the Western African Craton (Morocco). (b) Seismic lithosphere thickness after model LITHO1.0 (Pasyanos et al., 2014) along the same transect. Position of the high Vp anomaly corresponding to the Gibraltar slab in (a) is shown in grey. Hypocenters of major earthquakes are also shown. Abbreviations: Pyr.: Pyrenees; MC: Massif Central; GB: German Basin.