Abstract
Seismic tomography based on P-wave travel times and improved earthquake locations provides further evidence for mantle-wide convective flow. The use of body waves makes it possible to resolve long, narrow structures in the lower mantle some of which can be followed to sites of present-day plate convergence at the Earth's surface. The transition from subduction-related linear structures in the mid-mantle to long-wavelength heterogeneity near the core-mantle boundary remains enigmatic, but at least some slab segments seem to sink to the bottom of the mantle.
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van der Hilst, R., Widiyantoro, S. & Engdahl, E. Evidence for deep mantle circulation from global tomography. Nature 386, 578–584 (1997). https://doi.org/10.1038/386578a0
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DOI: https://doi.org/10.1038/386578a0
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