Three-dimensional structure of the earth from splitting in free-oscillation spectra

Details Three-dimensional structure of the earth from splitting in free-oscillation spectra Three-dimensional structure of the earth from splitting in free-oscillation spectra

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.325..405g&link_type=abstract

Nature (ISSN 0028-0836), vol. 325, Jan. 29, 1987, p. 405-411.

Astronomy and Astrophysics

Astronomy

103

Astronomical Models, Free Vibration, Geodesy, Geodynamics, Planetary Structure, Resonant Frequencies, Earth Core, Earth Mantle, P Waves, Vibration Mode

Scientific paper

Observations of splitting in free oscillations spectra can be used to constrain the three-dimensional distribution of heterogeneity in the earth. Modes sampling mainly the earth's mantle are compatible with the distributions of mantle heterogeneity inferred from P-wave travel times. The anomalously large splitting of modes penetrating deeply into the core requires large departures from sphericity which are difficult to accommodate within the framework of an isotropic model; it is argued that anisotropy of the inner core offers the most natural explanation of these data.

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