Seismic Tomogram of the Earth's Mantle: Geodynamic Implications

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Science  23 Oct 1992:
Vol. 258, Issue 5082, pp. 625-630
DOI: 10.1126/science.258.5082.625


Recent seismic tomography of the Earth's mantle has revealed a large-scale pattern of mantle convection comprising upwelling columnar plumes in the Pacific and Africa and downwelling planar sheets along the Circum Pacific. Upwelling and downwelling occur most extensively under the south Pacific and west Pacific, respectively. High-resolution image of plate subduction has been obtained from the dense seismic networks around Japan. Japanese seismologists are in the best position to resolve the internal structure of downwelling current as an integral part of the whole convection system.