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The effects of mantle and anelasticity on nutations, earth tides, and tidal variations in rotation rateThe 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.
Document ID
19870035066
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Wahr, John
(Colorado Univ. Boulder, CO, United States)
Bergen, Zachary
(Colorado, University Boulder, United States)
Date Acquired
August 13, 2013
Publication Date
November 1, 1986
Publication Information
Publication: Geophysical Journal
Volume: 87
ISSN: 0016-8009
Subject Category
Geophysics
Accession Number
87A22340
Funding Number(s)
CONTRACT_GRANT: NSF EAR-84-07110
CONTRACT_GRANT: NAG5-485
Distribution Limits
Public
Copyright
Other

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