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\section{Full gravity gradient tensor and its eigenvalue analysis}  \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 : :\\  \begin{equation}  T = \begin{bmatrix}   \frac{\partial^{2}U}{\partial_x^{2}} & \frac{\partial^{2}U}{\partial_ x\partial_y} & \frac{\partial^{2}U}{\partial_x\partial_x} \\   \frac{\partial^{2}U}{\partial_y\partial_x} & \frac{\partial^{2}U}{\partial_y^{2}} & \frac{\partial^{2}U}{\partial_y\partial_z} \\  \frac{\partial^{2}U}{\partial_z\partial_x} & \frac{\partial^{2}U}{\partial_z\partial_y} & \frac{\partial^{2}U}{\partial_z^{2}}  \end{bmatrix}   = \begin{bmatrix}   g_{xx} & g_{xy} & g_{xz} \\ g_{yx} & g_{yy} & g_{yz}\\g_{zx} & g_{zy} & g_{zz}   \end{bmatrix}  \end{equation}