An Accuracy Assessment of Absolute Gravimetric Observations in Fennoscandia

We compare a suite of absolute gravimeters used to monitor the temporal changes of gravity at a number of sites in Fennoscandia. Direct comparisons are made from simultaneous observations at selected sites within and outside of the postglacial uplift region. We also compare results at sites visited...

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Bibliographic Details
Main Authors: Pettersen, Bjørn Ragnvald, Bilker-Koivula, Mirjam, Breili, Kristian, Engfeldt, Andreas, Falk, Reinhard, Gitlein, Olga, Gjevestad, Jon Glenn Omholt, Hoppe, W, Lysaker, Dagny I, Mäkinen, Jaakko, Omang, Ove Christian Dahl, Reinhold, A, Timmen, Ludger
Format: Article in Journal/Newspaper
Language:English
Published: The Finnish Society of Built Environment Research 2010
Subjects:
Absolute gravimetry
Fennoscandia
Online Access:https://journal.fi/njs/article/view/3659
Description
Summary:We compare a suite of absolute gravimeters used to monitor the temporal changes of gravity at a number of sites in Fennoscandia. Direct comparisons are made from simultaneous observations at selected sites within and outside of the postglacial uplift region. We also compare results at sites visited by two instruments with some separation in time. We conclude from four years of data that gravity differences are obtained within an rms error of ± 3 Gal. The data reveal no systematic biases between the instruments, but occasional shifts from one year to another are noted. We consider that annual instrument comparisons are required to ensure data integrity in a regional observing program that extends over more than a decade.

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