Fig. 4From: Waveform inversion for 3-D S-velocity structure of D′′ beneath the Northern Pacific: possible evidence for a remnant slab and a passive plumeSchematic interpretation based on profile C–C′ in Figure 3. The basal thermal boundary layer is thicker beneath the subducted slab materials and a ‘passive plume’ has developed along the subducted slab remnantsBack to article page