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Practical Experiences with the First Relative Gravimeter of Type Scintrex CG-6 Autograv in Dubai, The United Arab of Emirates

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Document pages: 11 pages

Abstract: In September 2019, the Dubai Municipality of Dubai Emirate, the UnitedArab of Emirates, has received its first Scintrex CG-6 Autograv gravity meter.This paper describes the installation and initial gravity signals with the newCG-6 Autograv gravimeter. Two gravity field sites have been selected in DubaiCity and Hatta mountainous area. The relative gravity field measurements havebeen recorded for about one month time span; two weeks in Dubai and two weeks in Hatta.Among different effects reducing the gravity measurements, the tide and driftcorrections have been focused on this paper. Two tidal models have been appliedto reduce the tide effect based on the automated ETGTAB of the CG-6 gravimeterand ETERNA3.3 software. The results regarding the tide correction show verysmall discrepancies between both models (ETGTAB and ETERNA3.3) of about 2.2 μGaland 2.6 μGal in terms of standard deviations at Dubai and Hatta gravitystations, respectively. So, the outcome of the precise tidal model of CG-6Autograv gravimeter is reliable for tidal reduction within Dubai area and itssurroundings. Regarding the drift correction, the CG-6 Autograv provides lowinstrument drift values about 2.44 μGal and -2.35 μGal per day for the Dubai and Hattastations, respectively. Furthermore, it is recommended that the Hatta gravitystation would be considered as a stable and trusted gravity site. For Dubaigravity station, the gravity observations are affected by some noises fromtraffic activities while recording the gravity signal during the working days.Therefore, it is recommended for Dubaigravity station to be measured during the weekends and at nights inorder to avoid any noises affecting the CG-6 gravimeter.

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