One Year of Registration with the C021 Cryogenic Gravimeter at Station Membach (Belgium)

The results of one year registration of the C021 superconducting gravimeter at Membach (Belgium) are presented. Emphasis is placed on different methods to calibrate the gravimeter. The Earth tide analysis reveals the high quality of the data; the agreement with the Wahr-Dehant-Wang model is excellent. The long-term gravity changes observed with the C021 superconducting gravimeter are coherent with those measured with the FG5-102 absolute gravity meter. We prove for the first time that the long-term signal of the C021 cryogenic gravimeter is mainly of geophysical origin, and that the drift is within the range of 1 microgal.