The identification of bedrock for construction purposes in areas threatened by discontinuous deformations can be accomplished using various geophysical methods. The paper presents the results of studies conducted using the GPR method in the Zakrzówek horst area in Cracow as a site rich in karst structures (caves, cavities, sinkholes). A number of tests were carried out on the field using GPR equipment: ProEx System and RAMAC/GPR CU II of the Swedish company Mala Geoscience. During measurements 250 MHz shielded antennas were used. The following measurement parameters were changed during tests: sampling frequency, number ofstacks and distance between traces. The influence of the above parameters on the quality ofrecorded GPR images was analyzed.
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