Last Decade Gravity Data Processing in the ELGI

The Bouguer anomaly map shows an integrated image of the geological structures of the given area which depends on the density distribution of the rocks. It means that Bouguer anomaly map gives a summarized gravity effect of all geological formations to be found from the surface until a depth of several tens of kilometres. The different depths of the Moho in Central-Europe is determined by different crust thicknesses of the Carpathian Basin and its surrounding mountains (Alps, Carpathians and Dinarides) which are connected, first of all, to the isostatic roots of the mountain regions. A formula to calculate the isostatic effect of oceanic antiroots — or in case of Hungary the effect of deep sedimentary basins which cause the same effect — is known for a long while. So we realized full isostatic correction to get gravity Bouguer anomaly maps of Hungary without regional isostatic effects. We can get more information about the depths of gravity sources using spectral analysis and spectral depth estimations. The longest wavelengths are connected to crustal anomalies, while the shortest ones to the near surface gravity sources. We can separate gravity effects of different depths by spectral (matched) filtering of the Bouguer anomaly map.