The Lageos constraint on deep mantle viscosity - Results from a new normal mode method for the inversion of viscoelastic relaxation spectra

Details The Lageos constraint on deep mantle viscosity - Results from a new normal mode method for the inversion of viscoelastic relaxation spectra The Lageos constraint on deep mantle viscosity - Results from a new normal mode method for the inversion of viscoelastic relaxation spectra

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.9411p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Sept. 30, 1985, p. 9411-9421.

Physics

98

Earth Mantle, Earth Rotation, Lageos (Satellite), Viscosity, Density Distribution, Glaciers, Lithosphere, Viscoelasticity

Scientific paper

An analysis of 5-1/2 years of orbital data for the Lageos satellite has shown that there exists a residual acceleration in the node of the orbit. This acceleration is predominantly attributable to a secular decrease of the degree 2 component of the earth's gravitational potential field, J2, at the rate j2. Using a deglaciation history for the earth following the last glacial maximum 18,000 yr B.P., Yoder et al. (1983) employed a very simple theory of the rotational response of the earth to deglaciation to show that the observed j2 might be explained as a response of the earth to ice sheet disintegration. This analysis was confirmed and refined by Wu and Pelter (1984). In the present paper comparisons are conducted between predicted and observed j2 in the context of particularly simple parameterizations of the radial viscoelastic structure. The present-day nontidal acceleration is simply explained as a consequence of the delayed viscoelastic relaxation of the earth following deglaciation.

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