Physics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.4745h&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, April 10, 1986, p. 4745-4765.
Physics
108
Earth Motion, Forced Vibration, Geodesy, Nutation, Radio Interferometers, Very Long Base Interferometry, Annual Variations, Data Reduction, Earth Core, Earth Rotation, Extragalactic Radio Sources
Scientific paper
Very long baseline interferometry (VLBI) observations of compact extragalactic radio sources collected in North America and Europe between July 1980-December 1984 are analyzed. The nutations derived from VLBI data are compared with the nutations in the Wahr series (1981). Good correlation of the data is observed; however, it is detected that a correction of -1.80 + or - 0.18-i(0.42 + or - 0.18) is required for the amplitude of the retrograde annual nutation in the Wahr series. The change in free core nutation resonance frequency is calculated to explain the derivation in the retrograde annual nutation. It is concluded that VLBI earth nutation measurements have sufficient accuracy to be sensitive to core-mantle boundary properties.
Gwinn Carl R.
Herring Thomas A.
Shapiro Irwin I.
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