Absolute gravity observations on BIPM site A3 during the 1989 and 1994 International Comparisons of Absolute Gravimeters

摘要

Observations made with the JILA2 absolute gravimeter operated by the Geological Survey of Canada, during the 1989 and 1994 International Comparisons of Absolute Gravimeters, show that orientation-dependent systematic errors are introduced at the BIPM A3 site. With improved electronics, we can better identify instrument-induced vibrations which have a deleterious effect on the observations. Observations made in 1989 are compared with the measurements made in 1994. Furthermore, instrument orientation in 1994 is shown to have a damaging effect on the observations. This may suggest better designs for absolute gravity piers located on unconsolidated material.