Verifying the precision of a new generation absolute gravimeter FG5—Comparison with superconducting gravimeters and detection of oceanic loading tide

Shuhei Okubo, Shigeo Yoshida, Tadahiro Sato, Yoshiaki Tamura, Yuichi Imanishi

doi:10.1029/97gl00217

Verifying the precision of a new generation absolute gravimeter FG5—Comparison with superconducting gravimeters and detection of oceanic loading tide

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書誌事項

公開日: 1997-02-15

権利情報

http://onlinelibrary.wiley.com/termsAndConditions#vor

DOI

10.1029/97gl00217

公開者: American Geophysical Union (AGU)

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説明

<jats:p>We carried out a several day experiment at two sites to verify the precision of the FG5 absolute gravimeter through collocation with superconducting gravimeters. We found 2 to 4 microgal diurnal/semidiurnal signals in the time series of absolute gravity measurements. These signals agreed well with theoretical ocean tide both in amplitude and in phase, demonstrating that the FG5's precision is better than 2 microgal. Furthermore, we found that the discrepancy between the FG5 measurements and the SG measurements is 1.3 to 1.5 microgal. These results verify that the FG5 is precise to 1 to 2 microgal.</jats:p>