Abstract
AbstractThe retrograde rotational eigenmodes are produced by the interaction between solid mantle and liquid core in a rotating elliptical Earth, usually called free core nutation (FCN). The FCN quality factor (Q value), which depends on viscosity at the core‐mantle boundary (CMB), can effectively reflect the characteristics of energy dissipation at the CMB. The viscosity of the CMB is estimated for the first time based on the FCN quality factor Q values determined from stacking 27 high‐rate sampling and high‐precision tidal gravity observations at 23 stations in the Global Geodynamics Project (GGP) network around the world. The numerical results show that the dynamic viscosity can reach the order of 103 Pa·s. It is in good agreement with the most recent values deduced from VLBI observations by Smylie and Palmer. This result indicates that gravity is one of efficient techniques for the investigation of the Earth deep internal structure.
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