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Published May 22, 1980 | public
Journal Article

Bulk attenuation in the Earth and viscosity of the core


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 ~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.

Additional Information

© 1980 Nature Publishing Group. Received 17 October 1979; accepted 19 February 1980. This research was supported by the NSF under grant EAR 77- 14675. Jeff Given helped in the computations; R. Hart, F. Gilbert and R. Buland provided useful results. I thank H. Kanamori, A. Dziewonski and J. Flinn for helpful discussions.

Additional details

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