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This paper analysed physical known parameters which connect changes in mechanical field of the matter with electromagnetic wave occurrence. Previous laboratory investigations and theoretical prediction from Pride (1994), gives hope for detailed analysis of magnetograms to discover the seismic effects of disturbance of the magnetic field. In this paper is studied influence of the earthquake from 12.10.2013 in Crete, Greece, or magnetograms from geomagnetic stations on Plackovica and Skopje. Because of the low value of the amplitude of geomagnetic variation caused from seismic action, the transformation was made in the geromagnetic field in dH/dt time domain. The area of expected impact of seismo-magnetic phenomena in the magnetogram is defined, depending on the distance between the source of the earthquake and the area were magnetogram is registered (geomagnetic observatory), taking into account propagation velocity of the seismo-magnetic disturbances. Successful laboratory experiments and basic theory for correlation of seismic and geomagnetic field gives opportunity for development of seismomagnetism. [ABSTRACT FROM AUTHOR]