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Science 23 October 1992:
Vol. 258. no. 5082, pp. 625 - 630
DOI: 10.1126/science.258.5082.625
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Articles

Seismic Tomogram of the Earth's Mantle: Geodynamic Implications

Yoshio Fukao 1

1 Department of Earth and Planetary Sciences, Nagoya University, Chikusa, Nagoya 464-01, Japan

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.


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