HR: 0800h
AN: G31C-0798 INVITED     [Abstracts]
TI: Viscoelastic response of an eccentrically-nested liquid-core model to surface-toroidal traction
AU: * Martinec, Z
EM: zdenek@gfz-potsdam.de
AF: Dept. 1 Geodesy and Remote Sensing GeoForschungsZentrum Potsdam, GeoForschungsZentrum Potsdam Telegrafenberg, Potsdam, 14473 Germany
AB: We present a semi-analytical solution to the 2-D forward modelling of viscoelastic relaxation in a heterogeneous sphere consisting of a concentrically-nested elastic lithosphere and a viscoelastic mantle, and an eccentrically-nested liquid core. Several numerical methods for 2-D and 3-D viscoelastic relaxation modelling have been applied recently, including finite-element and spectral-finite-difference schemes. The present semi-analytical approach provides a model response that can be used to validate more general numerical algorithms. The solution for the eccentrically-nested liquid core has been tested by comparing it to the analytical solution for viscoelastic relaxation in concentrically-nested spheres and excellent agreement has been obtained.
DE: 5416 Glaciation
DE: 3210 Modeling
DE: 3230 Numerical solutions
DE: 1227 Planetary geodesy and gravity (5420, 5714, 6019)
DE: 1236 Rheology of the lithosphere and mantle (8160)
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting