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Since the thirties we have been knowing the terminus seismoelectrical effect . At that time American, German and Russian scientists were studying this phenomenon . First useful field tests were carried out then by Marmer and Sparks (Geophysics 24 (1959)2, IS. 297-308). Since the seventies seismological research has drawn more attention to the effect. The current paper will present results gained from digital seismic surveys.