Precise gravity measurements between Castlepoint and New Plymouth, North Island, New Zealand

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Woodward, D.J. 1982 Precise gravity measurements between Castlepoint and New Plymouth, North Island, New Zealand. [s.l.]: [s.n.]. Report / Geophysics Division 176 14 p.

Abstract: Gravity observations have been made on 80 benchmarks, 5-7 km apart from Castlepoint to New Plymouth as part of a programme to form a network of stations, which can be relocated and re-occupied to determine secular changes of gravity. The benchmarks form a line levelled by the Department of Lands and Survey in the 1978-79 as part of their programme to measure earth deformation. A LaCoste and Romberg model D gravity meter, D37, was used for the observations, which were made in a ladder sequence day by day. A minimum of three readings was made at each station. The internal consistency of the readings was such that after the effects of blunders and tares were removed, the root mean square residual of the observations was 75 nN/kg and the standard error of the gravity value (referred to an arbitrary base) at all the stations was less than 70 nN/kg