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The Mor graben is one of the most complex geological structures in Hungary. The greatest earthquake in Hungary was located in this area in 1810. The displacement of the fault of Csokako is about 1200 m. For the vertical movement investigation of the graben we built up a precise levelling between Bodajk and Csokako in 1990. The measurements of the line were made in 1991 and 1992. The mean square error of the levelling is 0.3 mm. The data was processed with the help of a developed program.