Abstract
New height precise Earth Geopotential Model EGM08 made it possible to develop the value of the geoidal geopotential W0. This value is independent on Earth’s tides and others disturbances, therefore it can be used as basic quantity for many applications. Value W0 represents mean sea surface. W0 was developed from data of satellite altimetry which monitores actual ocean’s surface. This value is one of the four fundamental geodetic constants. This value has been accepted worldwide and is included to the International Earth Rotation and Reference Systems Service Conventions (IERS Conventions) 2003, 2007. This value defines in principle parameters of level ellipsoid which best fit to the surface defined by W0. The body of this level ellipsoid produces normal gravity. We developed other important parameters for determination of the density deviations (VTT technology), i.e. values of normal gravity ge at the equator and gp at the pole on the elipsoid E0 and the value of parameter β. All parameters above used for development of VTT technology are supplied by GPS/leveling data that enable to create so-called density deviation maps at any place in the World. In comparison with gravity anomalies, the density deviations represent more precise density anomalous places in the Earth’s crust. A construction of density deviation map is applied at two from geologically different regions—the Western Carpathians and the Central African Rifts.
Highlights
Relationship between Gravity survey versus VTT method is displayed by Figure 1
New height precise Earth Geopotential Model EGM08 made it possible to develop the value of the geoidal geopotential W0
We developed other important parameters for determination of the density deviations (VTT technology), i.e. values of normal gravity e at the equator and p at the pole on the elipsoid E0 and the value of parameter β
Summary
Relationship between Gravity survey versus VTT method is displayed by Figure 1. Basic parameters used for determination of Density deviation: Earth components—angular velocity rotation, gravity constant and precise dimension of the Earth, defined spatial position of points gained from GPS, levelling mean sea level and processing SW. All used satellite, including GPS, have origin of coordinates relating to Earth center These data such enabled find out density deviation value at points of GPS measurements. The method VTT was tested and applied on the many localities of different parts of the World, e.g. Carpathians, Central African Rifts, Guinea Bay, Middle East, North Sea, Siberia or Arctic areas. For puprposes of this contribution two parts have been chosen—the West Carpathians and Central African Rifts
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