Abstract

Two S velocity models for the lower mantle are derived from the S travel times recently reported by Hales and Roberts. Observations of the difference in travel time of S and ScS are reported. On the basis of these observations it is estimated that the radius of the Earth's core is (3489.92 ± 4.66) km for one velocity model and (3486.10 ± 4.59) km for another.

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