Absolute Determination of Gravity in Australia for the Purpose of Establishment of Precise Reference Frame for Mean Sea Level Change Monitoring in Southwestern Pacific
Absolute gravity measurements were made at three sites in Australia as the first step of an on-going bilateral collaboration between Japan and Australia for the purpose of monitoring mean sea level change in the southwestern Pacific region. The measurements were taken with 3 Micro-g solutions FG5 absolute gravimeters: two of the instruments are owned by the Geographical Survey Institute (GSI), Japan, and the third is owned by the Exploration and Mining Division of CSIRO, Australia.
Intercomparison of the 3 instruments at Mt. Stromlo over a period of 3 days, show agreement to better than 1 microgal. The standard deviations of a single drop are 12–27 microgals and the formal errors of the determined gravity values are about 1 microgal. The data taken by these instruments clearly show the 2–6 microgal ocean load tidal components, indicating the suitability of these instruments to detect any non-tidal gravity changes on the order of 1 microgal corresponding to a vertical crustal movement of 3mm. We intend to continue this project as a joint research for the future.
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