Secular rotational motions and the mechanical structure of a dynamical viscoelastic earth

Details Secular rotational motions and the mechanical structure of a dynamical viscoelastic earth Secular rotational motions and the mechanical structure of a dynamical viscoelastic earth

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pepi...36..391y&link_type=abstract

(International Association of Seismology and Physics of the Earth's Interior, Symposium on Quantitative Geodynamics Lithospheric

Physics

11

Earth Mantle, Earth Planetary Structure, Earth Rotation, Lithosphere, Secular Variations, Viscoelasticity, Angular Velocity, Eigenvalues, Linear Equations, Liouville Equations, Rheology

Scientific paper

A survey is presented of analytical methods for computing the linear responses of the rotational axis of a layered viscoelastic earth to surface loading. Theoretical research in this area is first summarized, and the differences between the mechanical boundary conditions to be applied at the interface separating the upper and lower mantles for an adiabatically and chemically stratified mantle are discussed. Some examples of polar wander and secular variation of the spin rate from glacial excitation are presented for various types of chemical and viscosity stratifications. The effects of an artificial density jump at the base of the lithosphere in models are examined, and certain issues concerning the fluid tidal Love number for different types of density stratification are addressed. The meaning of effective plate thickness over geological time scales for rotational dynamics is discussed.

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