Fig. 4
From: Subducted oceanic crust as the origin of seismically slow lower-mantle structures
Top row: cross-sections through S40RTS beneath the African (left column) and Pacific (right column) plates. Each subsequent row is a cross-section through the recovered δ lnVs for dynamic models with different densities for the basaltic component after tomographic filtering. Geographic location of depth slice is provided in by the black vertical line through the globe. Broad low δ lnVs structures form in models where δρ≥3.1%. In many cases, high velocity features, which map onto recently subducted lithosphere, flank the low δ lnVs structures