Present-day 3-D deformation of Fennoscandia: Analysis and interpretation of the BIFROST GPS observations
We present results of 2477 days of continuous GPS observations and daily geodetic solutions in the BIFROST networks. We analyse the position solutions in terms of regional motions induced by avariety of geophysical phenomena operating over a range of time scales. The primary purpose is to resolve co...
| Main Authors: | , , , , , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.194.3037 http://www.oso.chalmers.se/~hgs/Articles/Bifrost_at_WEGENER_2000.pdf |
| Summary: | We present results of 2477 days of continuous GPS observations and daily geodetic solutions in the BIFROST networks. We analyse the position solutions in terms of regional motions induced by avariety of geophysical phenomena operating over a range of time scales. The primary purpose is to resolve constant rates of deformation produced by the on-going glacial isostatic adjustment of the region following the deglaciation of the Fennoscandian ice sheet. Power spectrum analysis of the residuals indicate that we are able to determine constant rates of horizontal motion with a precision below 0.1 mm/yr (vertical below 0.2 mm/yr). The observed eld of motion is strongly correlated to that predicted by postglacial rebound models. However, anumber of discrepancies exist that are currently open to interpretation. These discrepancies may result from shortcomings of the adopted rebound model, such as uncertainties in the deglaciation model or the absence of lateral heterogeneity and/or anisotropy in the modelled earth response; or, alternatively, mayresult from neotectonic deformation. In this case, regional seismicity observations as well as predictions of the crustal stress eld caused by mantle advection will provide important diagnostic information. 2 |
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