Global Images of the Earth's Interior

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Science  03 Apr 1987:
Vol. 236, Issue 4797, pp. 37-48
DOI: 10.1126/science.236.4797.37


The three-dimensional maps of the earth's interior now span regions from the bottom of the crust to the inner core of the earth. Although a wealth of new information on the dynamics of the earth has been discovered, the inner core offers the greatest surprise: it appears to be anisotropic with the axis of symmetry aligned with the axis of rotation.