Gravity change in the Fennoscandian uplift area observed by absolute gravimetry.

• Main Authors: Timmen, L., Gitlein, O., Klemann, V., Wolf, D.
• Other Authors: 1.3 Earth System Modelling, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum
• Format: Conference Object
• Language: unknown
• Published: 2009
• Subjects: 550 - Earth sciences; Norway; Fennoscandia; Fennoscandian
• Online Access: https://gfzpublic.gfz-potsdam.de/pubman/item/item_238765

The Nordic countries Norway, Sweden, Finland and Denmark are a key study region for the research of glacial isostasy. In addition, it 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 Hannover gravimeter FG5-220, an overall accuracy of +-30nm/s2 is indicated for a single station determination. First results of linear gravity changes are derived for 11 stations in the central and southern part of the uplift area. Comparing with the predicted rates of a glacial rebound modelling, the gravity trends of the absolute measurements differ by 20% (r.m.s. discrepancy) from the uplift model. The mean difference between observed and predicted rates is -0.6 nm/s2 per year only.