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Glacial isostasy and the interplay between upper and lower mantle lateral viscosity heterogeneities

Author:
Sabadini, R.   Gasperini, P.  


Journal:
Geophysical Research Letters


Issue Date:
1989


Abstract(summary):

From the analysis of sea-level data near the centre of the former Fennoscandian ice sheet and the theoretical predictions of vertically and laterally stratified Earth models, the authors explore the extent to which lateral viscosity variations could have influenced the estimate of long term mantle viscosity. A finite element scheme in cylindrical symmetry was followed focusing on the effects of lateral viscosity contrasts of different magnitudes and wavelengths. Sea-levels are consistent with long wavelength lateral viscosity contrasts of at most 2 orders of magnitude; short wavelength variations, comparable with the lateral extension of the surface load, should be ruled out. Differences in the average viscosities inferred from laterally stratified and uniform mantle models, may be as high as 1 order of magnitude


Page:
429-432


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