Forty-three years of absolute gravity observations of the Fennoscandian postglacial rebound in Finland
Abstract Postglacial rebound in Fennoscandia causes striking trends in gravity measurements of the area. We present time series of absolute gravity data collected between 1976 and 2019 on 12 stations in Finland with different types of instruments. First, we determine the trends at each station and a...
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crspringernat:10.1007/s00190-020-01470-9 2023-05-15T16:11:45+02:00 Forty-three years of absolute gravity observations of the Fennoscandian postglacial rebound in Finland Bilker-Koivula, Mirjam Mäkinen, Jaakko Ruotsalainen, Hannu Näränen, Jyri Saari, Timo National Land Survey of Finland 2021 http://dx.doi.org/10.1007/s00190-020-01470-9 http://link.springer.com/content/pdf/10.1007/s00190-020-01470-9.pdf http://link.springer.com/article/10.1007/s00190-020-01470-9/fulltext.html en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Journal of Geodesy volume 95, issue 2 ISSN 0949-7714 1432-1394 Computers in Earth Sciences Geochemistry and Petrology Geophysics journal-article 2021 crspringernat https://doi.org/10.1007/s00190-020-01470-9 2022-01-04T07:08:35Z Abstract Postglacial rebound in Fennoscandia causes striking trends in gravity measurements of the area. We present time series of absolute gravity data collected between 1976 and 2019 on 12 stations in Finland with different types of instruments. First, we determine the trends at each station and analyse the effect of the instrument types. We estimate, for example, an offset of 6.8 μgal for the JILAg-5 instrument with respect to the FG5-type instruments. Applying the offsets in the trend analysis strengthens the trends being in good agreement with the NKG2016LU_gdot model of gravity change. Trends of seven stations were found robust and were used to analyse the stabilization of the trends in time and to determine the relationship between gravity change rates and land uplift rates as measured with global navigation satellite systems (GNSS) as well as from the NKG2016LU_abs land uplift model. Trends calculated from combined and offset-corrected measurements of JILAg-5- and FG5-type instruments stabilized in 15 to 20 years and at some stations even faster. The trends of FG5-type instrument data alone stabilized generally within 10 years. The ratio between gravity change rates and vertical rates from different data sets yields values between − 0.206 ± 0.017 and − 0.227 ± 0.024 µGal/mm and axis intercept values between 0.248 ± 0.089 and 0.335 ± 0.136 µGal/yr. These values are larger than previous estimates for Fennoscandia. Article in Journal/Newspaper Fennoscandia Fennoscandian Springer Nature (via Crossref) Journal of Geodesy 95 2 |
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Open Polar |
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Springer Nature (via Crossref) |
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English |
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Computers in Earth Sciences Geochemistry and Petrology Geophysics |
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Computers in Earth Sciences Geochemistry and Petrology Geophysics Bilker-Koivula, Mirjam Mäkinen, Jaakko Ruotsalainen, Hannu Näränen, Jyri Saari, Timo Forty-three years of absolute gravity observations of the Fennoscandian postglacial rebound in Finland |
topic_facet |
Computers in Earth Sciences Geochemistry and Petrology Geophysics |
description |
Abstract Postglacial rebound in Fennoscandia causes striking trends in gravity measurements of the area. We present time series of absolute gravity data collected between 1976 and 2019 on 12 stations in Finland with different types of instruments. First, we determine the trends at each station and analyse the effect of the instrument types. We estimate, for example, an offset of 6.8 μgal for the JILAg-5 instrument with respect to the FG5-type instruments. Applying the offsets in the trend analysis strengthens the trends being in good agreement with the NKG2016LU_gdot model of gravity change. Trends of seven stations were found robust and were used to analyse the stabilization of the trends in time and to determine the relationship between gravity change rates and land uplift rates as measured with global navigation satellite systems (GNSS) as well as from the NKG2016LU_abs land uplift model. Trends calculated from combined and offset-corrected measurements of JILAg-5- and FG5-type instruments stabilized in 15 to 20 years and at some stations even faster. The trends of FG5-type instrument data alone stabilized generally within 10 years. The ratio between gravity change rates and vertical rates from different data sets yields values between − 0.206 ± 0.017 and − 0.227 ± 0.024 µGal/mm and axis intercept values between 0.248 ± 0.089 and 0.335 ± 0.136 µGal/yr. These values are larger than previous estimates for Fennoscandia. |
author2 |
National Land Survey of Finland |
format |
Article in Journal/Newspaper |
author |
Bilker-Koivula, Mirjam Mäkinen, Jaakko Ruotsalainen, Hannu Näränen, Jyri Saari, Timo |
author_facet |
Bilker-Koivula, Mirjam Mäkinen, Jaakko Ruotsalainen, Hannu Näränen, Jyri Saari, Timo |
author_sort |
Bilker-Koivula, Mirjam |
title |
Forty-three years of absolute gravity observations of the Fennoscandian postglacial rebound in Finland |
title_short |
Forty-three years of absolute gravity observations of the Fennoscandian postglacial rebound in Finland |
title_full |
Forty-three years of absolute gravity observations of the Fennoscandian postglacial rebound in Finland |
title_fullStr |
Forty-three years of absolute gravity observations of the Fennoscandian postglacial rebound in Finland |
title_full_unstemmed |
Forty-three years of absolute gravity observations of the Fennoscandian postglacial rebound in Finland |
title_sort |
forty-three years of absolute gravity observations of the fennoscandian postglacial rebound in finland |
publisher |
Springer Science and Business Media LLC |
publishDate |
2021 |
url |
http://dx.doi.org/10.1007/s00190-020-01470-9 http://link.springer.com/content/pdf/10.1007/s00190-020-01470-9.pdf http://link.springer.com/article/10.1007/s00190-020-01470-9/fulltext.html |
genre |
Fennoscandia Fennoscandian |
genre_facet |
Fennoscandia Fennoscandian |
op_source |
Journal of Geodesy volume 95, issue 2 ISSN 0949-7714 1432-1394 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1007/s00190-020-01470-9 |
container_title |
Journal of Geodesy |
container_volume |
95 |
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2 |
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1765996922673299456 |