Abstract
Bullen and Haddon1,2 have derived a density model for the Earth (model HB1) which is designed to accord with the observed free oscillation data. Their solution is based on Jeffreys's α and β (P and S velocity) distributions for the mantle and Bolt's α distribution for the core. To avoid the unlikely condition of a constant density throughout most of the lower mantle, they had to postulate an Earth model having a radius 15 to 20 km greater than that of the Jeffreys model. Taggart and Engdahl3, on the other hand, have used PcP data to determine a core radius of 3,477 ± 2 km, only 4 km greater than the Jeffreys value.
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MUIRHEAD, K., CLEARY, J. Free Oscillations of the Earth and the D″ Layer. Nature 223, 1146 (1969). https://doi.org/10.1038/2231146a0
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DOI: https://doi.org/10.1038/2231146a0
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