| Summary: | We determined absolute gravity at a base station located in the north-east corner of the U.S. Polar Rock Repository based on two field surveys conducted in summer 2005. We used a CG-5 Scintrex Autograv System for our measurements. The meter can measure relative gravity to a precision of 0.001 mGal. To find the absolute gravity we visited three tie-point sites, one located at the OSU Main Library, one in downtown Columbus and one south-west of town near Bolton Airfield. The sites were set up by the NOAA and NGS and absolute gravity was determined using a relative gravimeter (Lacoste-Romberg) which in turn was tied back to a site of known gravity. An absolute gravity measurement was conducted by NOAA-NGS in summer 2005 at OSU, in Mendenhall Laboratory. At each of the sites, we recorded a series of gravity measurements. These were subsequently used to calculate absolute gravity at the rock repository base station where measurements were taken at the start and end of the survey. We found the absolute gravity at the base station to be 980082.070 mGal with an error of about 0.035 mGal. This report is a summary of this investigation.
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