Absolute Gravimetry with the Hannover Meters JILAg-3 and FG5-220, and their Deployment in a Danish-German Cooperation

authored by: Ludger Timmen, Olga Gitlein, Jürgen Müller, Gabriel Strykowski, Rene Forsberg
Abstract: Using absolute gravimetry, geodetic networks can be surveyed to realize a homogeneous gravity standard of regional to global extent and to monitor time dependent variations in the Earth's gravity field. With the receipt of the transportable free-fall gravimeter JILAg-3 at the Institut für Erdmessung (IfE, Leibniz Universität Hannover) in 1986, projects were initiated with a main objective to improve national and international gravimetric networks. Deficiencies in the definition of the absolute datum (gravimetric scale and level) could be overcome. As a second goal, absolute gravity determinations were performed to support the geodynamic research in regions where geophysical phenomena deform the Earth's surface. Presently, the FG5 gravimeter is the state-of-the-art in the measurements of absolute gravity. With the high measuring accuracy, new applications have been risen, e.g. the monitoring of environmental changes. For IfE, the FG5-220 is the second absolute meter obtained in 2002, and is the follow-up of the JILAg-3. Comparisons of results with both absolute gravimeters among themselves and with other instruments show that the results from both instruments are well adjusted to the international gravity standard. But a bias of +0.09 μm/s² has to be considered for the JILAg-3 measurements when comparing with FG5-220 results. As a case study for an interdisciplinary long-term research, a Danish-German cooperation is described. Besides the establishment of a national gravimetric reference, a strong geophysical background characterizes the joint projects performed since 1986.
Organisation(s): Institute of Geodesy
External Organisation(s): Technical University of Denmark
Type: Article
Journal: Zeitschrift fur Geodasie, Geoinformation und Landmanagement (ZFV)
Volume: 133
Pages: 149-163
No. of pages: 15
ISSN: 1618-8950
Publication date: 30.06.2008
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: General Earth and Planetary Sciences
Electronic version(s): https://geodaesie.info/zfv/heftbeitrag/586 (Access: Unknown)
: Details in the research portal "Research@Leibniz University"

BibTeX

@article{29cefc48bf754f73990c954a1514e6df,
title = "Absolute Gravimetry with the Hannover Meters JILAg-3 and FG5-220, and their Deployment in a Danish-German Cooperation",
abstract = "Using absolute gravimetry, geodetic networks can be surveyed to realize a homogeneous gravity standard of regional to global extent and to monitor time dependent variations in the Earth's gravity field. With the receipt of the transportable free-fall gravimeter JILAg-3 at the Institut f{\"u}r Erdmessung (IfE, Leibniz Universit{\"a}t Hannover) in 1986, projects were initiated with a main objective to improve national and international gravimetric networks. Deficiencies in the definition of the absolute datum (gravimetric scale and level) could be overcome. As a second goal, absolute gravity determinations were performed to support the geodynamic research in regions where geophysical phenomena deform the Earth's surface. Presently, the FG5 gravimeter is the state-of-the-art in the measurements of absolute gravity. With the high measuring accuracy, new applications have been risen, e.g. the monitoring of environmental changes. For IfE, the FG5-220 is the second absolute meter obtained in 2002, and is the follow-up of the JILAg-3. Comparisons of results with both absolute gravimeters among themselves and with other instruments show that the results from both instruments are well adjusted to the international gravity standard. But a bias of +0.09 μm/s2 has to be considered for the JILAg-3 measurements when comparing with FG5-220 results. As a case study for an interdisciplinary long-term research, a Danish-German cooperation is described. Besides the establishment of a national gravimetric reference, a strong geophysical background characterizes the joint projects performed since 1986.",
author = "Ludger Timmen and Olga Gitlein and J{\"u}rgen M{\"u}ller and Gabriel Strykowski and Rene Forsberg",
year = "2008",
month = jun,
day = "30",
language = "English",
volume = "133",
pages = "149--163",
journal = "Zeitschrift fur Geodasie, Geoinformation und Landmanagement (ZFV)",
issn = "1618-8950",
publisher = "Wissner Verlag",
number = "3",
}