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Apparent calibration shift of the Scintrex CG-5 gravimeter caused by reading-dependent scale factor and instrumental drift

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Abstract

Calibration measurements of the Scintrex CG-5 gravimeter were conducted using absolute gravity stations of the Japan Gravity Standardization Net, to constrain the scale factor and its temporal changes. The calibration data were obtained from a total gravity interval of 1.4 Gal through six campaigns, conducted for over 5 years between years 2012 and 2017. The scale factors varied by 1500 ppm in a range from 0.9991 to 1.0006, according to station combinations of the six campaigns. The scale factor depends primarily on the gravity reading ranges: for similar gravity reading ranges, no significant differences in the estimated scale factors were recognised, even though station combinations and observed times are different. Therefore, the gravity readings can be corrected by introducing a gravity reading-dependent scale factor. Furthermore, even though the scale factor essentially depends on gravity readings and not on time, temporal changes were observed during repeated calibration measurements at the same station combinations. A long-term instrumental drift of the CG-5 gravimeter could explain this phenomenon. In conclusion, the calibration shifts recognised during repeated measurements were apparently caused by: (1) the scale factor dependence on the gravity reading ranges and (2) the shift of the gravity reading ranges due to the instrumental drift.

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Acknowledgements

I am grateful to the staff of Geodetic Department, the Geospatial Information Authority of Japan (GSI), for providing data on the JGSN stations and for consultation on our measurements at the stations. I wish to thank Dr. Y. Miyabuchi of Kumamoto University, Tokai University Space Information Center, Japan Airport Terminal Building Co., Ltd., New Chitose Airport Terminal Building Co., Ltd., Okinawa Regional Headquarters, JMA, Ishigakijima Local Meteorological Observatory for supporting measurements at the gravity stations. Measurements at the JGSN stations and at the Izu-Oshima volcano were supported by the staff of the Meteorological Research Institute and of the Izu-Oshima Resident Office for Volcanic Disaster Mitigation, JMA. I would like to thank the Associate Editor Professor Ilias N. Tziavos and the anonymous reviewers for improving my manuscript through their constructive and critical comments.

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  1. Meteorological Research Institute, Japan Meteorological Agency, 1-1 Nagamine, Tsukuba, Ibaraki, 305-0052, Japan

    Shin’ya Onizawa

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  1. Shin’ya Onizawa
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Correspondence to Shin’ya Onizawa.

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Onizawa, S. Apparent calibration shift of the Scintrex CG-5 gravimeter caused by reading-dependent scale factor and instrumental drift. J Geod 93, 1335–1345 (2019). https://doi.org/10.1007/s00190-019-01247-9

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  • DOI: https://doi.org/10.1007/s00190-019-01247-9

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