Physics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986geoj...87..633w&link_type=abstract
Geophysical Journal (ISSN 0016-8009), vol. 87, Nov. 1986, p. 633-668.
Physics
100
Anelasticity, Earth Mantle, Earth Rotation, Earth Tides, Nutation, Deformation, Diurnal Variations, Moon, Sun, Very Long Base Interferometry
Scientific paper
The paper models the effects of mantle anelasticity on luni-solar nutations, on tidal deformation, on tidal variations in rotation rate, and on the eigenfrequency of the free core nutation. The results can be used to invert observations to solve for the anelastic contributions to the shear and bulk moduli of the upper and lower mantle. Specific anelastic models are used to numerically estimate the effects of anelasticity on these geodetic observables. The nutation estimates are compared with observational results. Among the conclusions: (1) mantle anelasticity is likely to be the most important source of damping for the free core nutation; (2) present VLBI nutation results are, in principle, accurate enough to usefully bound anelasticity at diurnal periods. But the discrepancy between the VLBI observed nutations and the 1984 IAU nutation model cannot be explained by anelasticity and is not yet well enough understood to allow anelasticity to be determined from the data.
Bergen Zachary
Wahr John
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