Table 1 Results of absolute gravity measurements with FG5 absolute gravimeters at Mizusawa
Year | Date | Serial numbers of FG5/dropping chamber | Effective number of drops | Mean gravity acceleration, µGal | Drop-to-drop scatter, µGal | Standard error of mean gravity, µGal | Instrumental offset, µGal |
|---|---|---|---|---|---|---|---|
2015 | July 8–10 | 212/212 | 8,700 | 980,146,211.57 | 13.4 | 0.14 | – |
2016 | June 25–27 | 241/212 | 7,731 | 980,146,212.17 | 30.5 | 0.35 | – |
2017 | June 24–26 | 212/109 | 10,712 | 980,146,207.54 | 13.5 | 0.13 | – |
2018 | June 23–25 | 109/241B | 9,875 | 980,146,213.15 | 14.1 | 0.14 |  + 8.6 |
2019 | June 29–30 | 241/212 | 6,564 | 980,146,201.94 | 26.6 | 0.33 | – |
2020 | October 2–3 | 241/241 | 7,669 | 980,146,195.95 | 23.7 | 0.27 | – |
2021 | June 25–27 | 109/109 | 14,809 | 980,146,199.90 | 8.4 | 0.07 | – |