Absolute gravimetry on the agulhas negras calibration line

Abstract

The Agulhas Negras Gravity Calibration Line was established in the mid 1980s using LaCoste & Romberg gravimeters model "G" only. Five gravity stations were irregularly positioned along its 200 km length, spanning a total range of 627 mGal. The new absolute gravimeter Micro-g Solutions A-10 #011 of Observatório Nacional was taken to each calibration station and new measurements were made. The local vertical gravity gradient was also measured at each calibration station. This report shows their new gravity values and compares them with previously published values based solely on relative gravimetry. These new absolute values of local gravity should be taken as updated reference values in any calibration work along the Agulhas Negras Calibration Line.