Overtones of Free Oscillations and the Structure of the Earth's Interior

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Science  25 Jun 1971:
Vol. 172, Issue 3990, pp. 1336-1338
DOI: 10.1126/science.172.3990.1336


Identification of 82 percent of all possible spheroidal overtones with greater than 300 seconds increases the resolving power of the set of gross searth data. Results of inversion indicate a change of composition in the deepest 500 kilometers of the mantle. The assumption that the inner core is rigid is required to satisfy simultaneously the data on free oscillations and travel times.