Abstract

This paper deals with the stability of gravity measurements in time of some specific sites in France (J9-Strasbourg, Cerga (Grasse), Brest, Welschbruch (Vosges Mountains)) as observed by regular gravity measurements since February 1997 with the absolute gravimeter FG5#206. The rate of repetition of absolute gravity measurements is variable ranging from one experiment every six weeks at Strasbourg to one per year at Brest. The variations of the gravity value are compared with the variations of the vertical position deduced from different collocation positioning techniques (Global Positioning System, Satellite Laser Ranging, Lunar Laser Ranging). This comparison will be analysed in order to bring new elements to a discussion on the discrimination between the gravity contribution resulting from vertical motion in the Earth’s vertical free air gradient field and the one originating from mass redistribution.

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