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

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)489-492
Number of pages4
JournalGeophysical Research Letters
Volume24
Issue number4
DOIs
Publication statusPublished - 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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