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Geoacta

On-line version ISSN 1852-7744

Abstract

MIRANDA, Silvia; HERRADA, Alfredo  and  PACINO, María Cristina. Instrumental response of scintrex autograv cg-5 (s/n 40484) gravity meter in continuous and survey modes. Geoacta [online]. 2013, vol.38, n.1. ISSN 1852-7744.

Due to its technical characteristics and simplicity of measurement, the automatic gravimeter Scintrex CG-5 is used by a wide range of users. Several investigations have shown that the performance of each gravimeter must be assessed in particular, since the response of each instrument is affected differently by external factors, giving rise to residuals that could be of the order of the demanded accuracy. In this work, for the gravimeter Scintrex CG-5 S/N 40484: 1) It was investigated under laboratory conditions for the continuous mode, the influence on gravimetric records of meteorological variables (atmospheric pressure and temperature). The long term instrumental drift (35 days records) was also determined. 2) In survey mode was carried out a calibration, a determination of vertical gradient of local gravity, and measurements on points located in the province of San Juan. Gravity differences between stations and the gravimeter parameters were estimated by means of a network adjustment. Based on our results, we conclude that this instrument could detect in continuous mode (e.g., crustal movements, hydrogeology, etc.) or in survey mode, variations of gravity with accuracies of some microgals. In both cases it is necessary to follow a proper measurement protocol and post-processing of data.

Keywords : Microgravimetry; Relative gravimetry; Automatic gravity meters.

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