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Space-geodetic constraints on glacial isostatic adjustment in Fennoscandia

Milne, G.A; Davis, J.L; Mitrovica, J.X; Scherneck, H.-G; Johansson, J.M; Vermeer, M; Koivula, H

Authors

G.A Milne

J.L Davis

J.X Mitrovica

H.-G Scherneck

J.M Johansson

M Vermeer

H Koivula



Abstract

Analysis of Global Positioning System (GPS) data demonstrates that ongoing three-dimensional crustal deformation in Fennoscandia is dominated by glacial isostatic adjustment. Our comparison of these GPS observations with numerical predictions yields an Earth model that satisfies independent geologic constraints and bounds both the average viscosity in the upper mantle (5 × 1020 to 1 × 1021 pascal seconds) and the elastic thickness of the lithosphere (90 to 170 kilometers). We combined GPS-derived radial motions with Fennoscandian tide gauge records to estimate a regional sea surface rise of 2.1 ± 0.3 mm/year. Furthermore, ongoing horizontal tectonic motions greater than ~1 mm/year are ruled out on the basis of the GPS-derived three-dimensional crustal velocity field.

Citation

Milne, G., Davis, J., Mitrovica, J., Scherneck, H., Johansson, J., Vermeer, M., & Koivula, H. (2001). Space-geodetic constraints on glacial isostatic adjustment in Fennoscandia. Science, 291(5512), 2381-2385. https://doi.org/10.1126/science.1057022

Journal Article Type Article
Publication Date Mar 23, 2001
Deposit Date Feb 26, 2007
Journal Science
Print ISSN 0036-8075
Electronic ISSN 1095-9203
Publisher American Association for the Advancement of Science
Peer Reviewed Peer Reviewed
Volume 291
Issue 5512
Pages 2381-2385
DOI https://doi.org/10.1126/science.1057022

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