The inner core translational triplet and the density near earth's center

Details The inner core translational triplet and the density near earth's center The inner core translational triplet and the density near earth's center

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sci...255.1678s&link_type=abstract

Science (ISSN 0036-8075), vol. 255, March 27, 1992, p. 1678-1682. Research supported by NSERC.

Computer Science

46

Density Distribution, Earth Core, Earth Planetary Structure, Geomagnetism, Gravimetry, Ohmic Dissipation

Scientific paper

Four long records from superconducting gravimeters yield evidence of the triplet of translational oscillations of the solid inner core about its central position. Calculations of core oscillation modes allow identification of the three translational resonances at periods of 3.5820 +/- 0.0008, 3.7677 +/- 0.0006, and 4.015 +/- 0.001 hours by their rotational splitting. Each resonance is defined by approximately 20 successive spectral estimates. A new earth model brings the computed periods into agreement with observation. It has a central density of 12.960 g/cu cm, an inner core radius of 1221.1 km, and a density jump at the inner core boundary of 0.407 g/cu cm.

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