Fig. 8: Model set-ups.

3-D sketchs of the laboratory set-ups with the subducting plate at an early stage of the subduction process. a Tomographic Particle Image Velocimetry (PIV) setup used to compute the 3D mantle flow in a 10 cm (800 km) wide by 100 cm (8000 km) long by 8.25 cm (660 km) deep volume next to the subducting plate. b Stereoscopic PIV setup used to image the 3 components of the mantle flow in a horizontal section located at 2.8 cm (224 km) below the model surface.