Abstract
Free-oscillation data reveal heterogeneity in the Earth's mantle whose geographical pattern is dominated by spherical harmonics of angular degree two and correlates well with the hydrostatically referenced geoid. The heterogeneity can be modelled as localized in the transition zone (420–670 km depth) and may be related to a large-scale component of mantle convection.
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Masters, G., Jordan, T., Silver, P. et al. Aspherical Earth structure from fundamental spheroidal-mode data. Nature 298, 609–613 (1982). https://doi.org/10.1038/298609a0
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DOI: https://doi.org/10.1038/298609a0
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