Geophysical Monographs #59; Vol. 9; 10.5x8.75x.75; 205 pages; 1990 IGU oversize HC in glossy boards. Square tight and clean. Bookplate of private sciences library but no other library marks or indications. Contents bright and clean. VG-.

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Bibliographic Details

Title

Variations in Earth Rotation

Publisher

Amer Geophysical Union, Washington, D. C.

Publication Date

1990

Language

English

ISBN 10

0875904599

ISBN 13

9780875904597

Binding

Hardcover

Condition

Very Good-

Seller catalogs

Sciences

About this title

Synopsis

Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 59.

As part of the Nineteenth General Assembly of The International Union of Geodesy and Geophysics Symposium (IUGG) in Vancouver, Canada, Union Symposium U4, "Variations in Earth Rotation" was held August 18-19 1987. The Convenor was Dennis D. McCarthy, U.S. Naval Observatory with P. Paquet, Observatoire Royal de Belgique and M. G. Rochester, St. Johns University serving as co-convernors. In a session on internal structure of the Earth papers dealt with the geophysical effects on Earth rotation parameters. Mantle anelasticity increases the free core nutation (FCN) period by a few days. The period of the FCN and the amplitudes of the main nutation components are sensitive to the ellipticity of the core?]mantle boundary (CMB), and a non-hydrostatic increase of 400m in the flattening of the CMB is a possible explanation of the discrepancies from theory. An alternative suggestion rests on the subseismic description of the nutation spectrum of the stratified liquid core. Evidently new models will have to take into account contributions from the oceans, mantle anelasticity, non-hydrostatic pre-stress, CMB topography and internal core structure.

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