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| Summary: This study is made to investigate blast-induced ground vibrations occurred in two different quarries and to determine whether the blasts may cause damage to the structure in the surrounding area. The blasts were recorded with an acceleometer and these records were analysed with a signal analysis. Acceleometer, were set on places where ground characteristics are different and the records were investigated in terms of the effect of ground features. From the analysis of the 13 blastings results, there are important differences among the records of three-components acceleration time. It is also found that some blasts with high accelerations show high dominant frequences and low periods values at Fourier analysis. Considering the main structural frequences changing between 5-10 Hz, generally it is found that the damage risk of structures is of the lowest level. Since all data from these blasts aren' t adequate, It could not be developed a relationship among the blast amount, distance and acceleration. Addiotinally, blasts recorded in different distances show that acceleration is decreased as the distance from the blast. It is observed that blasts recorded in the rock area have high dominant frequences and low period values whereas it has low frequences and high period values in the filling ground. Blasts with low frequence values may cause rezonances at structures. Because of low acceleration values, there is no damagein the structure of surrounding area. But if there is repeated blasts having a high acceleration as well as high explosive amount then there will be observable cracks in the plaster of structures. Key words: Ground Vibration, Acceleometer, Quarry, Fourier Spectra, Rezonance
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