Earth’s mantle heterogeneity theories
Conceptual model sketches for proposed compositional structures of Earth's mantle, including "Marble cake", "Thermo-chemical piles", and "Mid-mantle blobs" theories.
Seismic mantle tomography maps
Surface projected global horizontal seismic S-wave velocity anomaly maps for different mantle depths revealing the two large low shear-wave velocity provinces (LLSVPs).