Authors:Ágnes Skultéti, Tivadar M. Tóth, István János Kovács, Edit Király, and Judit Sándorné Kovács
Tüske , T.
2001 : A Mórágyi-rög metamorfitjainak szerkezeti értékelése (szakdolgozat) (in Hungarian, translated title: Tectonic interpretation of the metamorphism of the Mórágy Block [graduate thesis] . – Kézirat (manuscript
The paper presents some methods of transforming ETRS89 co-ordinates to official Slovenian datum (D48) co-ordinates. Together with traditional transformation methods of scaling, translation and rotation least squares collocation is also used. The results of different transformation procedures between the astrogeodetic network and global co-ordinate system (ETRS89) show a lot of the drawbacks of existing national co-ordinate frame.
Thermal convection has been modelled in a 3D model box, in order to estimate the areal density of upwellings and compare it to the density of hotspots, assumed as surface imprints of the cylindrical upwellings of the mantle. The number of the hotspots of the Earth is 40 to 100. If this is translated to a nondimensional areal plume density, using the depth of the convecting layer as length unit, a value of 2-6 is obtained for whole-mantle convection, while this value is 0.04-0.10 for a separately convecting upper mantle. The nondimensional theoretical areal plume density has been found about 0.2-1.0 for reasonable numerical models of the mantle. The fact, that the theoretical value lies between the densities estimated for one- and two-layer mantle systems, supports the possibility of a mixed regime, where some of the plumes come from the base of the mantle, some others from the 660 km boundary.