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We present the results of ground-based Ultra Low Frequency (ULF) magnetic field measurements observed from June to August 2004 during the Bovec earthquake on 12 July 2004. Further we give information about the seis- mic activity in the local observatory region for an extended time span 2004 and 2005. ULF magnetic field data are pro- vided by the South European Geomagnetic Array (SEGMA) where the experience and heritage from the CHInese MAG- netometer (CHIMAG) fluxgate magnetometer comes to ap- plication. The intensities of the horizontal H and vertical Z magnetic field and the polarization ratio R of the verti- cal and horizontal magnetic field intensity are analyzed tak- ing into consideration three SEGMA observatories located at different close distances and directions from the earth- quake epicenter. We observed a significant increase of high polarization ratios during strong seismic activity at the ob- servatory nearest to the Bovec earthquake epicenter. Apart from indirect ionospheric effects electromagnetic noise could be emitted in the lithosphere due to tectonic effects in the earthquake focus region causing anomalies of the vertical magnetic field intensity. Assuming that the measured ver- tical magnetic field intensities are of lithospheric origin, we roughly estimate the amplitude of electromagnetic noise in the Earths crust considering an average electrical conductiv- ity of =10 3 S/m and a certain distance of the observa- tory to the earthquake epicenter.

Multi-point ground-based ULF magnetic field observations in Europe during seismic active periods in 2004 and 2005