Space-Geodetic Constraints on Glacial Isostatic Adjustment in Fennoscandia
Journal article, 2001

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 satis├×es independent geologic constraints and bounds both the average viscosity in the upper mantle (5 x 10^20 to 1 x 10^21 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.


Glenn A. Milne

James L. Davis

Jerry X. Mitrovica

Hans-Georg Scherneck

Chalmers, Department of Radio and Space Science

Jan Johansson

Chalmers, Department of Radio and Space Science

Martin Vermeer

Hannu Koivula


0036-8075 (ISSN)

Vol. 291 23 March 2001 2381-2385


Basic sciences


Onsala Space Observatory

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