Observing Gravity Change in the Fennoscandian Uplift Area with the Hanover Absolute Gravimeter
Observing Gravity Change in the Fennoscandian Uplift Area with the Hanover Absolute Gravimeter
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DOI：
10.1007/s00024-011-0397-9
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发表时间：
2012-08
影响因子：
2
通讯作者：
L. Timmen;O. Gitlein;V. Klemann;D. Wolf
中科院分区：
文献类型：
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作者：
L. Timmen;O. Gitlein;V. Klemann;D. Wolf
北欧国家挪威、瑞典、芬兰和丹麦是冰川均衡研究的重点地区。此外，这种研究为绝对重力测量提供了一个独特的机会，以显示其作为地球物理研究的大地测量工具的能力。在一项多国合作中，自2003年以来，国际重力研究所在芬诺斯坎迪亚进行了年度绝对重力测量。对于汉诺威重力仪FG5-220，单站测定的总体精度为±30 nm/s2。首先给出了隆起区中部和南部10个台站的重力线性变化结果。与冰川回弹模型预测的速率相比，绝对测量的重力趋势与隆升模型每年相差3.8 nm/s2(均方根差)。观测到的速率与预测的速率之间的平均差异仅为每年0.8 nm/s2。得到的比例因子−为1.63±0.20 nm/s2/mm，它描述了观测重力和高度率的平均比值。
The Nordic countries Norway, Sweden, Finland and Denmark are a key study region for research of glacial isostasy. In addition, such research offers a unique opportunity for absolute gravimetry to show its capability as a geodetic tool for geophysical research. Within a multi-national cooperation, annual absolute gravity measurements have been performed in Fennoscandia by IfE since 2003. For the Hanover gravimeter FG5-220, overall accuracy of ±30 nm/s2is indicated for a single station determination. First results of linear gravity changes are derived for ten stations in the central and southern part of the uplift area. Comparing with the rates predicted by glacial rebound modelling, the gravity trends of the absolute measurements differ by 3.8 nm/s2per year (root-mean-square discrepancy) from the uplift model. The mean difference between observed and predicted rates is 0.8 nm/s2per year only. A proportionality factor of −1.63 ± 0.20 nm/s2per mm has been obtained, which describes the mean ratio between the observational gravity and height rates.