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Impact of 3-D Earth structure on Fennoscandian glacial isostatic adjustment: Implications for space-geodetic estimates of present-day crustal deformations

Whitehouse, Pippa; Latychev, Konstantin; Milne, Glenn A.; Mitrovica, Jerry X.; Kendall, Roblyn

Impact of 3-D Earth structure on Fennoscandian glacial isostatic adjustment: Implications for space-geodetic estimates of present-day crustal deformations Thumbnail


Authors

Konstantin Latychev

Glenn A. Milne

Jerry X. Mitrovica

Roblyn Kendall



Abstract

The importance of including lateral Earth structure in the analysis of Fennoscandian glacial isostatic adjustment (GIA) is investigated using a finite volume numerical formulation. Comparing output from radially-varying 1-D Earth models and models which account for the presence of plate boundaries, lateral variations in lithospheric thickness and viscosity heterogeneities in the upper and lower mantle, we find that perturbations to present-day rates of surface deformation due to the inclusion of 3-D Earth structure significantly exceed current observational uncertainties. Predicted residuals between 1-D and 3-D Earth models may be improved with the use of a 1-D model which approximates the local depth-dependent mean of the 3-D model. However, the remaining misfit is still large enough to significantly bias inferences of Earth structure and ice history. We conclude that lateral variations at both global and regional scales must be accounted for when interpreting GPS observations from Fennoscandia.

Citation

Whitehouse, P., Latychev, K., Milne, G. A., Mitrovica, J. X., & Kendall, R. (2006). Impact of 3-D Earth structure on Fennoscandian glacial isostatic adjustment: Implications for space-geodetic estimates of present-day crustal deformations. Geophysical Research Letters, 33, https://doi.org/10.1029/2006gl026568

Journal Article Type Article
Publication Date Jul 1, 2006
Deposit Date Oct 18, 2010
Publicly Available Date Oct 22, 2010
Journal Geophysical Research Letters
Print ISSN 0094-8276
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 33
DOI https://doi.org/10.1029/2006gl026568
Publisher URL http://www.agu.org/pubs/crossref/2006/2006GL026568.shtml

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Copyright Statement
Whitehouse, Pippa and Latychev, Konstantin and Milne, Glenn A and Mitrovica, Jerry X. and Kendall, Roblyn (2006), 'Impact of 3-D Earth structure on Fennoscandian glacial isostatic adjustment : implications for space-geodetic estimates of present-day crustal deformations'., Geophysical research letters, 33, L13502, 10.1029/2006GL026568. To view the published open abstract, go to http://dx.doi.org and enter the DOI.







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