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\subsection{Theory of GGT}  \label{}   The practical gradio meter systems for rapidly measuring GGT have been developed (Bell et al., 1997; Jekeli, 1993). Mikus and Hinojosa (2001) propose the method of approximating of the GGT from measured gravity data. The full gravity gradient tensor, symbol T, can be written in the form (Eq. (1)):  \begin{bmatrix} 0 \{center}0  & -1 \\ 1 & 0 \end{bmatrix} = \begin{bmatrix} 11 & -11 \\ 21 & 20 \end{bmatrix}\\ \begin{equation}  \label{eq.1}  p = g_{xx}g_{yy} + g_{xx}g_{zz} + g_{yy}g_{zz}−g_{zx}g_{xz}−g_{xy}g_{yx}−g_{zy}g_{yz};