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Calibration values for gravity base stations, McMurdo Station and Scott Base, Ross Island, Antarctica

Published online by Cambridge University Press:  03 June 2009

G.S. Wilson  and
K.J. Tinto
G.S. Wilson*
Affiliation:
Department of Marine Science & Department of Geology, University of Otago, PO Box 56, Dunedin, New Zealand
K.J. Tinto
Affiliation:
Department of Geology, University of Otago, PO Box 56, Dunedin, New Zealand
*
*gary.wilson@otago.ac.nz
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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; 77.8448°S, 166.6418°E; 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 (77.8490°S, 166.6794°E) at McMurdo Station, 982973.40 mGal for the MMD-N Station (77.8491°S, 166.7567°E) at Scott Base, and 982977.83 mGal for the newly established SBG-1 Station (77.8499°S, 166.7667°E) 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.

Keywords

gravity surveysLa Coste & Romberg gravity meter
Type
Earth Sciences
Information
Antarctic Science , Volume 21 , Issue 4 , August 2009 , pp. 367 - 372
Copyright
Copyright © Antarctic Science Ltd 2009

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