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1 2005

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Relation between gravity time variation, vertical surface movements and sediment thickness in the Carpathian Basin

Völgyesi L., Csapó G., Szabó Z.

Reports on Geodesy

2005

z. 2/73

255-262

The investigation of phenomena, influencing the short time variation of gravity, has gained importance with the increasing accuracy of gravity meters. Accordingly, we have studied vertical surface movements, attributable to two effects: compaction of sediments, on the one hand, and structural movements, on the other in the young sedimentary Pannonian Basin. ln most of the deep sedimentary regions positive correlation can be found between sediment thickness and subsidence. As a consequence of subsidence, observation pointsof the surface get into a different equipotential level of the Earth's gravity field. Calculating the effects of the vertical surface movements, determined by repeat levelling, for a 10-year time span, the variation of gravity io general should be about 3 μGal (1 μGal = 10-8m/s2), but at special places it may reach as much as 10-20 μGal.