Abstract
The paper presents the results of a study of the relationship of seismic events with geomagnetic disturbances arising from the acoustic impact on the lower ionosphere, which are caused by vibrations of the Earth’s surface at distances of several thousand kilometers from the earthquake source. The measurements were carried out at Mikhnevo Observatory, which is equipped with an instrumental complex, including seismic, acoustic, electromagnetic, and ionospheric means of observation. It is also equipped with a time-reference system that uses GPS receivers, which ensures an accuracy of the measurement data synchronization of no worse than 20 ns. The regularities of the formation of atmospheric and geomagnetic effects of distant earthquakes and the dependence of the time of their occurrence on the distance to the seismic source are shown on the example of five seismic events. It is demonstrated that the difference in the nature and time of the occurrence of geomagnetic pulsations associated with the impact of acoustic waves on the ionosphere differ from the signals caused by the seismomagnetic effect.
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