Determination of rock densities in the Carpathian-Pannonian Basin lithosphere: based on the CELEBRATION 2000 experiment

The international seismic project CELEBRATION 2000 brought very goodinformation about the P-wave velocity distribution in the Carpathian-Pannonian Basinlitosphere. In this paper seismic data were used for transformations of in situ P-wavevelocities to in situ densities along all profiles running across the Western Carpathiansand the Pannonian Basin: CEL01, CEL04, CEL05, CEL06, CEL09, CEL11 and CEL12.The calculation of rock densities in the crust and lower lithosphere was done by thetransformation of seismic velocities to densities using the formulae of Sobolev-Babeyko,Christensen-Mooney and in the lower lithosphere also by Lachenbruch-Morgan’s formula.The density of the upper crust changes significantly in the vertical and horizontal directions,while the interval ranges of the calculated lower crust densities narrow downprominently. The lower lithosphere is the most homogeneous – the intervals of the calculateddensities for this layer are already very narrow. The average density of the uppercrust (ρ = 2.60 g·cm−3) is the lowest in the Carpathian Foredeep region. On the contrary,the highest density of this layer (ρ = 2.77 g·cm−3) is located in the Bohemian Massif. Theaverage densities ρ of the lower crust vary between 2.90 and 2.98 g·cm−3. The PalaeozoicPlatform and the East European Craton have the highest density (ρ = 2.98 g·cm−3 andρ = 2.97 g·cm−3, respectively). The lower crust density is the lowest (ρ = 2.90 g·cm−3) inthe Pannonian Basin. The range of calculated average densities ρ for the lower lithosphereis changed in the interval from 3.35 to 3.40 g·cm−3. The heaviest lower lithosphere can beobserved in the East European Craton (ρ = 3.40 g·cm−3). The lower lithosphere of theTransdanubian Range and the Palaeozoic Platform is characterized by the lowest densityρ = 3.35 g·cm−3.