Fig. 2

(b,c) PRFs, 3D-depth migrated and stacked using a 3D velocity model (GyPSuM), are plotted along profile AA*, marked in Fig. 3. Yellow horizontal lines in the (b) and (c) panels indicate depths to the 410 km and 660 km discontinuities respectively. (a) Shows the number of PRFs stacked in the corresponding grid.