Bulk attenuation in the earth and viscosity of the core

Details Bulk attenuation in the earth and viscosity of the core Bulk attenuation in the earth and viscosity of the core

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.285..204a&link_type=abstract

Nature, vol. 285, May 22, 1980, p. 204-207.

Mathematics

13

Bulk Modulus, Earth Core, Seismic Waves, Vibration Damping, Viscosity, Wave Attenuation, Iron, Liquid Metals, Oscillations, Q Values, Relaxation Method (Mathematics), Relaxation Time

Scientific paper

Recent studies indicate that bulk absorption is required somewhere in the earth to explain the damping of the radial modes of free oscillation. This excess absorption, if attributed to bulk viscosity in the core, requires a value of approximately 500 P. This is theoretically reasonable and may be due to structural or concentration fluctuations. The shear viscosity is at least several orders of magnitude smaller.

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