Space-Geodetic Constraints on Glacial Isostatic Adjustment in Fennoscandia
Artikel i vetenskaplig tidskrift, 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 satisÞes 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.

Författare

Glenn A. Milne

James L. Davis

Jerry X. Mitrovica

Hans-Georg Scherneck

Chalmers, Institutionen för radio- och rymdvetenskap

Jan Johansson

Chalmers, Institutionen för radio- och rymdvetenskap

Martin Vermeer

Hannu Koivula

Science

0036-8075 (ISSN)

Vol. 291 23 March 2001 2381-2385

Fundament

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Geofysik