FEATURES OF GEOMAGNETIC EFFECTS OF SEISMOGEODYNAMIC CHANGES IN THE TERRITORY OF AZERBAIJAN

Abstract

In seismically active regions of the world, before strong earthquakes, it was recorded that the geomagnetic field has changed abnormally, and so far, the regularity of the seismomagnetic effect and other warning factors as a short-term, instantaneous forecast has not been fully confirmed. As one of the warning factors, since the signs of anomalous electromagnetic change are more convincing than other forecasting factors, data on changes in magnetic field over time at different points in Azerbaijan have been analyzed since the 1980’s. Measurement data of magnetometric regime observations in 6 regular points of the Republican Seismic Survey Center of ANAS have been analyzed in connection with earthquakes magnitude of M≥4.0 in the territory of Azerbaijan and features of epicenter-dependent change of seismomagnetic effect have been investigated. It has been found that anomalous magnetic changes sometimes last from 2-3 days to 25-30 days, and the amplitude of the changes is 30-40 nTl and sometimes more. Features of the seismomagnetic effect associated with M≥4.0 earthquakes in the territory of Azerbaijan. For the first time, based on the analysis carried out taking into account the depth of the hypocenter of the earthquake and the stratum
complex, it was determined that the seismomagnetic effect was observed in different forms. It has been shown that the seismomagnetic effect observed in the foci in the granite and basalt layers is bay-shaped and observed for about 20-25 days, while the seismomagnetic effect observed in the foci in the sedimentary layer is observed with rhythmic changes and sometimes uncharacteristicfor 40-50 days.