Magnetic Survey LLC

"Global S-wave tomographic slice (oceans excluded) through Earth at 150 km depth, displaying the wide-spread high wave-speed anomalies of deep cratonic mantle roots—in shades of blue—that extend far beyond the boundaries of the exposed/inferred crust of 55 identifiable Archean nuclei (%Vs, where Vs is the perturbation in shear wave velocity relative to a modified AK135 reference model24). Cratons, with crust stable since about 1 Gyr ago and underpinned by lithosphere >150-km-thick occupy around 63% of the continental landmass. Asterisks identify modified cratons where ancient crust is underlain by recently thinned lithosphere. Composite cratons comprise multiple Archean nuclei/cratons. The 6 supercratons (bold text) comprise multiple composite cratons. Diagonal stripes cover regions strongly influenced by subducting slabs, which are not classified as cratons. For a 200-km-thick tomographic slice, and a similar image coloured according to conventions for scientific maps, see the Supplementary Information. The map was prepared using the global self-consistent, hierarchical, high-resolution geography database (https://www.soest.hawaii.edu/pwessel/gshhg/)."

Source: https://rdcu.be/dBFlP

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