Computer Science
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ecis..306...11b&link_type=abstract
(Royal Society, Discussion on the Earth's Core: Its Structure, Evolution and Magnetic Field, London, England, Jan. 27, 28, 1982.
Computer Science
Earth Core, Earth Planetary Structure, Propagation Velocity, Seismic Waves, Wave Propagation, Amplitudes, Density Distribution, Earth Movements, Free Vibration, Seismology, Stratification, Velocity Distribution, Vibration Damping
Scientific paper
The most accurate recent estimates of core seismic velocities are compared with the Jeffreys (1939) solution, emphasizing the present resolution capability and remaining uncertainties. A comparison is made of the relative contributions of seismic body wave and terrestrial eigenspectra measurements to the inverse problem of determining core elastic parameters, density, and damping. Linear perturbation algorithms and smoothing functions applied to the spectral data reduce their capacity for fine structural definition. At the 1400-3300 km radii of shell E, the outer core appears to be homogeneous and nonstratified, with small or zero rigidity and a dimensionless seismic factor of the order of 10,000. The inner core has a sharp outer boundary at about 1216 radius. Recent travel-time and waveform synthetics suggest a strong increase of P wave velocity in the upper 300 km of the inner core, which may be interpreted as a mixing or melting event.
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