Physics
Scientific paper
Aug 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002e%26psl.202...49w&link_type=abstract
Earth and Planetary Science Letters, Volume 202, Issue 1, p. 49-60.
Physics
13
Scientific paper
The importance of mode coupling in a viscoelastic self-gravitating spherical earth with lateral variations in linear or nonlinear rheology is investigated with a finite-element model coupled to Poisson's equation. Both the lateral viscosity variations and the harmonic load are axisymmetric. The effects of self-gravitation, viscosity contrast and the location of the abrupt lateral change in viscosity in a linear mantle are studied and are found to be significant in determining the strength of mode coupling. It is demonstrated that a larger number of harmonics than generally assumed is required to give accurate description of the induced deformation. Mode coupling is also found to be important in a nonlinear mantle especially when the harmonic degree l is large.
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