Bonvalot Sylvain, Diament M., Gabalda Germinal. (1998). Continuous gravity recording with Scintrex CG-3M meters : a promising tool for monitoring active zones. Geophysical Journal International, 135 (2), p. 470-494. ISSN 0956-540X.
Titre du document
Continuous gravity recording with Scintrex CG-3M meters : a promising tool for monitoring active zones
Année de publication
1998
Type de document
Article
Auteurs
Bonvalot Sylvain, Diament M., Gabalda Germinal
Source
Geophysical Journal International, 1998,
135 (2), p. 470-494 ISSN 0956-540X
We acquired continuous series of microgravity measurements using several Scintrex CG-3M gravity meters for several weeks in 1997. The meters with 1 microGal resolution were installed side by side in a stable reference station at the ORSTOM research centre to perform identical data acquisition. We present and compare the instrumental responses obtained for the various gravity meters (measurement series of gravity field, standard deviation, internal temperature, tilts) and analyse their correlation with simultaneous recordings of meteorological parameters. The data have been processed in order to establish the mid- to long-term relative stability and the accuracy of the instruments, estimate the contribution of instrumental effects to gravity data measurements and quantify the amplitude of the time variations of the gravity field that might be detected with such instruments. This study emphasizes the sensitivity of some instrumental responses of the Scintrex CG-3M gravity meters (such as internal temperature or tilt) to local atmospheric-pressure variations. This sensitivity can lead to non-negligible perturbations of the gravity measurements through automatic corrections applied in real-time mode by the integrated software. We show that most of these instrumental artefacts can be easily removed in data post-processing by using simultaneous atmospheric-pressure data. After removal of an accurate Earth tide model, the instrumental drift and the instrumental effects, the temporal series are compared by computing differential signals... (D'après résumé d'auteur)
