Continuous GPS measurements of postglacial adjustment in Fennoscandia: 2. Modeling results
[1] Data collected under the auspices of the BIFROST GPS project yield a geographically dense suite of estimates of present-day, three-dimensional (3-D) crustal deformation rates in Fennoscandia [Johansson et al., 2002]. A preliminary forward analysis of these estimates [Milne et al., 2001] has indi...
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ftchalmersuniv:oai:research.chalmers.se:1671 2023-05-15T16:11:53+02:00 Continuous GPS measurements of postglacial adjustment in Fennoscandia: 2. Modeling results Milne, G.A. Mitrovica, J.X. Scherneck, Hans-Georg Davis, J.L. Johansson, Jan Koivula, H. Vermeer, M. 2004 text https://doi.org/10.1029/2003JB002619 https://research.chalmers.se/en/publication/1671 unknown http://dx.doi.org/10.1029/2003JB002619 https://research.chalmers.se/en/publication/1671 Earth and Related Environmental Sciences galaxies: Seyfert ISM: molecules radio lines: galaxies 2004 ftchalmersuniv https://doi.org/10.1029/2003JB002619 2022-12-11T06:52:24Z [1] Data collected under the auspices of the BIFROST GPS project yield a geographically dense suite of estimates of present-day, three-dimensional (3-D) crustal deformation rates in Fennoscandia [Johansson et al., 2002]. A preliminary forward analysis of these estimates [Milne et al., 2001] has indicated that models of ongoing glacial isostatic adjustment (GIA) in response to the final deglaciation event of the current ice age are able to provide an excellent fit to the observed 3-D velocity field. In this study we revisit our previous GIA analysis by considering a more extensive suite of forward calculations and by performing the first formal joint inversion of the BIFROST rate estimates. To establish insight into the physics of the GIA response in the region, we begin by decomposing a forward prediction into the three contributions associated with the ice, ocean, and rotational forcings. From this analysis we demonstrate that recent advances in postglacial sea level theory, in particular the inclusion of rotational effects and improvements in the treatment of the ocean load in the vicinity of an evolving continental margin, involve peak signals that are larger than the observational uncertainties in the BIFROST network. The forward analysis is completed by presenting predictions for a pair of Fennoscandian ice histories and an extensive suite of viscoelastic Earth models. The former indicates that the BIFROST data set provides a powerful discriminant of such histories. The latter yields bounds on the ( assumed constant) upper and lower mantle viscosity (nu(UM), nu(LM)); specifically, we derive a 95% confidence interval of 5 x 10(20) less than or equal to nu(UM) less than or equal to 10(21) Pa s and 5 x 10(21) less than or equal to nu(LM) less than or equal to 5 x 10(22) Pa s, with some preference for (elastic) lithospheric thickness in excess of 100 km. The main goal of the ( Bayesian) inverse analysis is to estimate the radial resolving power of the BIFROST GPS data as a function of depth in the mantle. ... Other/Unknown Material Fennoscandia Fennoscandian Chalmers University of Technology: Chalmers research Journal of Geophysical Research: Solid Earth 109 B2 |
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Open Polar |
collection |
Chalmers University of Technology: Chalmers research |
op_collection_id |
ftchalmersuniv |
language |
unknown |
topic |
Earth and Related Environmental Sciences galaxies: Seyfert ISM: molecules radio lines: galaxies |
spellingShingle |
Earth and Related Environmental Sciences galaxies: Seyfert ISM: molecules radio lines: galaxies Milne, G.A. Mitrovica, J.X. Scherneck, Hans-Georg Davis, J.L. Johansson, Jan Koivula, H. Vermeer, M. Continuous GPS measurements of postglacial adjustment in Fennoscandia: 2. Modeling results |
topic_facet |
Earth and Related Environmental Sciences galaxies: Seyfert ISM: molecules radio lines: galaxies |
description |
[1] Data collected under the auspices of the BIFROST GPS project yield a geographically dense suite of estimates of present-day, three-dimensional (3-D) crustal deformation rates in Fennoscandia [Johansson et al., 2002]. A preliminary forward analysis of these estimates [Milne et al., 2001] has indicated that models of ongoing glacial isostatic adjustment (GIA) in response to the final deglaciation event of the current ice age are able to provide an excellent fit to the observed 3-D velocity field. In this study we revisit our previous GIA analysis by considering a more extensive suite of forward calculations and by performing the first formal joint inversion of the BIFROST rate estimates. To establish insight into the physics of the GIA response in the region, we begin by decomposing a forward prediction into the three contributions associated with the ice, ocean, and rotational forcings. From this analysis we demonstrate that recent advances in postglacial sea level theory, in particular the inclusion of rotational effects and improvements in the treatment of the ocean load in the vicinity of an evolving continental margin, involve peak signals that are larger than the observational uncertainties in the BIFROST network. The forward analysis is completed by presenting predictions for a pair of Fennoscandian ice histories and an extensive suite of viscoelastic Earth models. The former indicates that the BIFROST data set provides a powerful discriminant of such histories. The latter yields bounds on the ( assumed constant) upper and lower mantle viscosity (nu(UM), nu(LM)); specifically, we derive a 95% confidence interval of 5 x 10(20) less than or equal to nu(UM) less than or equal to 10(21) Pa s and 5 x 10(21) less than or equal to nu(LM) less than or equal to 5 x 10(22) Pa s, with some preference for (elastic) lithospheric thickness in excess of 100 km. The main goal of the ( Bayesian) inverse analysis is to estimate the radial resolving power of the BIFROST GPS data as a function of depth in the mantle. ... |
author |
Milne, G.A. Mitrovica, J.X. Scherneck, Hans-Georg Davis, J.L. Johansson, Jan Koivula, H. Vermeer, M. |
author_facet |
Milne, G.A. Mitrovica, J.X. Scherneck, Hans-Georg Davis, J.L. Johansson, Jan Koivula, H. Vermeer, M. |
author_sort |
Milne, G.A. |
title |
Continuous GPS measurements of postglacial adjustment in Fennoscandia: 2. Modeling results |
title_short |
Continuous GPS measurements of postglacial adjustment in Fennoscandia: 2. Modeling results |
title_full |
Continuous GPS measurements of postglacial adjustment in Fennoscandia: 2. Modeling results |
title_fullStr |
Continuous GPS measurements of postglacial adjustment in Fennoscandia: 2. Modeling results |
title_full_unstemmed |
Continuous GPS measurements of postglacial adjustment in Fennoscandia: 2. Modeling results |
title_sort |
continuous gps measurements of postglacial adjustment in fennoscandia: 2. modeling results |
publishDate |
2004 |
url |
https://doi.org/10.1029/2003JB002619 https://research.chalmers.se/en/publication/1671 |
genre |
Fennoscandia Fennoscandian |
genre_facet |
Fennoscandia Fennoscandian |
op_relation |
http://dx.doi.org/10.1029/2003JB002619 https://research.chalmers.se/en/publication/1671 |
op_doi |
https://doi.org/10.1029/2003JB002619 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
109 |
container_issue |
B2 |
_version_ |
1765997084139323392 |