parallel matlab code for seismic tomography data inversion Abstract: The objective of the thesis is to verify the effectiveness of staggered grid mesh applied to two known inversion methods in resolution enhancement. The staggered grid is an approach to enhance resolution and smoothness by averaging several coarse grid inversion solutions by shifting an original grid in both directions in case of 2D inversion without risk of undetermination associated with a fine grid. In this thesis we have taken an overview about the traveltime seismic tomography, with a focus on crosshole tomography and the use of staggered grid for inversion enhancement. The practical work was to improve some properties of an already developed matlab code (SGRAT), which is stand for Staggered Grid Random Tomography invented by Godio Alberto, and Luigi Sambuelli 2011; besides recovering some running errors and an application to synthetic and real field datasets.