Abstract
The effect of laterally homogeneous background viscosity profile on postglacial rebound induced surface motion on a laterally heterogeneous earth is investigated. The lateral viscosity perturbations are inferred from seismic tomography model S20A. Three different background viscosity models are investigated—they differ in lithospheric thickness and the viscosity jump across the 670 km discontinuity. The coupled Laplace-finite-element method is used to calculate present-day crustal motion on a spherical, self-gravitating, incompressible, viscoelastic earth with self-gravitating oceans, induced by the ICE-4G deglaciation model. Results show that background viscosity significantly affects the magnitude of the uplift rate, and both direction and magnitude of the tangential velocity. Thus a good handle on the background viscosity is very important in the study and interpretation of glacial isostatic data.
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