Forward and Inverse Modelling of GPS Observations of Fennoscandian GIA
Abstract
Project BIFROST (Baseline Inferences for Fennoscandian Rebound Observations Sea Level and Tectonics) was initiated in 1993 to directly measure the present-day, 3-D crustal deformation field in Fennoscandia [Johansson et al., JGR, 107, 2002; Milne et al., Science, 291, 2001]. A dense array of continuously operating GPS (Global Positioning System) receivers was deployed between 1993 and 1997 to achieve this objective. The BIFROST GPS network is composed of two sub-networks, the Swedish SWEPOS {TM} network and the Finnish FinnRef{ {TM}} network which, together, provide a relatively uniform and broad spatial sampling of crustal motion in Sweden and Finland. We shall present results from both forward and inverse modelling analyses of the BIFROST data. In particular, we shall focus on the implications of the results for constraining sub-surface viscosity structure and the deglaciation history of the most recent Fennoscandian ice sheet. We shall also discuss the residual signal in the context of limitations of the earth and ice components of the GIA model as well as a regional neotectonic signal.
- Publication:
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AGU Spring Meeting Abstracts
- Pub Date:
- May 2004
- Bibcode:
- 2004AGUSM.G33A..06M
- Keywords:
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- 1208 Crustal movements: intraplate (8110);
- 1236 Rheology of the lithosphere and mantle (8160);
- 1243 Space geodetic surveys;
- 8107 Continental neotectonics