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NGS to Host International Comparison of Absolute Gravimeters

January 15, 2021

NOAA's Table Mountain Gravity Observatory near Boulder, Colorado, has been selected as the host of the next International Comparison of Absolute Gravimeters (ICAG) in the summer of 2023. These comparisons, which take place every four years, are certified by the International Bureau of Weights and Measures in Sevres, France. Institutions from around the world will send representatives to confirm the consistent operation of their extremely accurate gravity instruments. The event will also include informal meetings and discussions between the visiting scientists and NOAA staff. The event will be co-organized with researchers from the National Institute of Standards and Technology. This is the first international comparison to be held in North America. The goal is to identify and correct tiny offsets in the output of these instruments. NGS uses absolute gravity measurements to help monitor long-term changes to the new vertical datum.

For more information, contact: Derek Vanwestrum