Fig. 3

Variations in the depths to the (a) 410 km, (b) 660 km discontinuities and (c) mantle transition zone thickness, determined from stacking of PRFs depth migrated using the GyPSuM 3D velocity model. (d) Indicates the topography/bathymetry variations along the profile and the depths to the (e) 410 km discontinuity, (f) 660 km discontinuity and (g) mantle transition zone thickness. The dashed horizontal red line indicates the (e) 410 km depth, (f) 660 km depth and (g) global average of mantle transition zone thickness.