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Durham University

Department of Geography

Departmental Research Projects

Publication details

Milne, G.A, Davis, J.L, Mitrovica, J.X, Scherneck, H.-G, Johansson, J.M, Vermeer, M & Koivula, H Space-geodetic constraints on glacial isostatic adjustment in Fennoscandia. Science. 2001;291:2381-2385.

Author(s) from Durham

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 נ1020 to 1 נ1021 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.

Department of Geography