Abstract:
This paper is devoted to a comparative analysis of gravity changes as observed both by an absolute gravimeter (AG-FG5 model 206) and a superconducting gravimeter (SG-GWR model C026) operating in paralel in Strasbourg in 1997-1998. Two main objectives will be sought: on the one hand, we want to establish the calibration capability of AG/SG parallel registrations, especially with respect to stability in time, duration requirement and precision; on the other hand, the absolute gravity values will be superimposed on the superconducting gravimeter observations in order to estimate long-term gravity changes and to attempt to separate true physical effects from the instrumental drift contribution of the cryogenic meter.