Preliminary results from the superconducting gravimeter SG-060 installed in West Africa (Djougou, Benin) - Archive ouverte HAL Accéder directement au contenu
Chapitre D'ouvrage Année : 2014

Preliminary results from the superconducting gravimeter SG-060 installed in West Africa (Djougou, Benin)

Résumé

A GWR superconducting gravimeter of the new generation (OSG-60) has been installed in July 2010 in sub-humid West Africa, at the Djougou station in Benin. This station is located in the AMMA-CATCH long term hydrological observing system. We present the first results in terms of instrumental drift as well as the calibration results using FG5 absolute gravity measurements. We show that geophysical contributions due to hydrological load can bias the initial drift estimate. The noise level is compared to the Strasbourg SG as well as to the reference New Low Noise Model (NLNM) used in seismology. We also investigate the gravity response to atmospheric pressure changes and show that, because of the presence of large thermal tides, the gravity response to mass changes in the atmosphere is more complex than in the simple case of a constant barometric admittance.
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Dates et versions

hal-00926864 , version 1 (10-01-2014)

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Jacques Hinderer, Séverine Rosat, Basile Hector, Marta Calvo, J.-P. Boy, et al.. Preliminary results from the superconducting gravimeter SG-060 installed in West Africa (Djougou, Benin). Chris Rizos, Pascal Willis. Earth on the Edge: Science for a Sustainable Planet, Springer Berlin Heidelberg, pp.413-419, 2014, International Association of Geodesy Symposia, 978-3-642-37222-3. ⟨10.1007/978-3-642-37222-3_55⟩. ⟨hal-00926864⟩
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