Abstract
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.
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Anderson, D. Bulk attenuation in the Earth and viscosity of the core. Nature 285, 204–207 (1980). https://doi.org/10.1038/285204a0
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DOI: https://doi.org/10.1038/285204a0
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