Abstract
New reference gravity values are provided for gravity base stations at McMurdo Station and Scott Base. The new values are obtained by a relative survey including the Hut Point base station (an International Satellite Triangulation station; 77.84488S, 166.64188E; 982975.65 mGal) located 110 m north of Scott's 1901 Discovery Hut at McMurdo Station. This site is the only remaining station tied by previous surveys to the now defunct SATGRAV base Station located in the former Building 57, which was, in turn, measured by an absolute meter in 1995. New values are 982970.41 mGal for the THIEL-1 Station (77.84908S, 166.67948E) at McMurdo Station, 982973.40 mGal for the MMD-N Station (77.84918S, 166.75678E) at Scott Base, and 982977.83 mGal for the newly established SBG-1 Station (77.84998S, 166.76678E) under the flagpole at Scott Base. Our difference values are very consistent with previous surveys, including Nakagawa's value for MMD-N at Scott Base, which is within 0.2 mGal of our new value. Received 19 November 2008, accepted 19 January 2009
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