Article (Scientific journals)
Long-term stability of tilt-controlled gPhoneX gravimeters
Fores, Benjamin; Klein, Gilbert; Le Moigne, Nicolas et al.
2019In Journal of Geophysical Research. Solid Earth, 124 (11), p. 12264-12276
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Keywords :
Gravity Monitoring; Spring gravimeters; Long-term gravity changes
Abstract :
[en] Abstract Spring relative gravimeters are considered too unstable to provide useful information on long-term gravity variations. In this paper, we prove that the new generation of spring gravimeter gPhoneX can reach long-term stability at the μGal level (10 nm.s-2) when the verticality of the gravimeter is maintained, if the instrumental drift can be correctly estimated. We conducted two comparisons with different gPhoneXs in different observatories and environmental conditions. In the ‘Walferdange Underground Laboratory for Geodynamics’ in Luxembourg, we compared time series from the gPhoneX (with and without tilt control), with data from a superconducting gravimeter. We found an agreement at the μGal level when the tilt control is switched on. We validated this result by repeating the experiment at the ‘Geodesy in Karstic Environment’ observatory in the South of France. The fit between the superconducting gravimeter and the gPhoneX hourly values gives similar results at all frequencies over 276 days of measurements. The linear correlation coefficient between the gPhoneX and superconducting gravimeter reaches 0.99, with a misfit of 6.0 nm.s-2. We demonstrated that tilt-controlled gPhoneXs are suitable for long-term gravity monitoring.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Fores, Benjamin ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Klein, Gilbert ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Le Moigne, Nicolas
Francis, Olivier  ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
External co-authors :
yes
Language :
English
Title :
Long-term stability of tilt-controlled gPhoneX gravimeters
Publication date :
2019
Journal title :
Journal of Geophysical Research. Solid Earth
ISSN :
2169-9356
Publisher :
Wiley
Volume :
124
Issue :
11
Pages :
12264-12276
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBilu :
since 08 November 2019

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