Calibration of the Latest Generation Superconducting Gravimeter iGrav-043 Using the Observatory Superconducting Gravimeter OSG-CT040 and the Comparisons of Their Characteristics at the Walferdange Underground Laboratory for Geodynamics, Luxembourg

Abstract In December 2019, the latest generation transportable superconducting gravimeter (SG) iGrav-043 purchased by University of Bonn was installed in Walferdange Underground Laboratory for Geodynamics (WULG) Grand Duchy Luxembourg. this paper, we estimate calibration factor iGrav-043, which is essential long-term gravity monitoring. We used simultaneously collected data from un-calibrated and calibrated Observatory OSG-CT040 that operates continuously at WULG since 2002. The tidal analysis provides a simple way to transfer one SG other. then assess compare analyses, instrumental drifts high frequency noises. After 20 years continuous operation, drift almost zero. From 533 days joint found exhibits composite behavior: just after setup two months fast exponential decrease 171 nm s ?2 , linear with rate 66 ± 10 per year. suggest period 3 sufficient calibrating iGrav. Accidental electrical power cuts triggered slight differences reaction recovery iGrav-043. However, it has been behavior not affected.