Abstract
Using data on spheroidal and torsional Earth oscillations, and taking account of the revised value of the Earth's moment of inertia, the variation of density and elasticity in the Earth has been re-examined. The most important among several new conclusions are that the radius of the core needs increasing by about 15 km and that a much reduced density gradient is required in the upper mantle.
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BULLEN, K., HADDON, R. Earth Oscillations and the Earth's Interior. Nature 213, 574–576 (1967). https://doi.org/10.1038/213574a0
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DOI: https://doi.org/10.1038/213574a0
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