Earth’s Seismic Activity and Galactic Cosmic Rays: Global and Regional Characteristics in Solar Cycles 21–24

In this paper, we have shown that in the interval from 2007 to 2011, which is taken as a measure of the global intensity of the Earth’s seismic activity, the N EQ/Year ( M ≥ 5.0) number of strong (the magnitude is M ≥ 5.0) crustal (the hypocenter depth is 0 ≤ h ≤ 60 km) earthquakes per year significantly exceeds the upper limit of the level of two standard deviations from the average calculated from 1973 to 2019 (21–24th cycles of solar activity), while the maximum relative deviation (in 2011) from it is ≈ 78%. This situation is observed at the end of the 23rd cycle and the beginning of the 24th cycle of solar activity. The indicated time interval is characterized by the maximum intensity of galactic cosmic rays at a distance of 1 a.u. outside the Earth’s magnetosphere at a fixed rigidity of 10 GV over the entire period of observations (from the 1950s to the present) while the value of the relative intensity of galactic cosmic rays (δ Year ) is significantly higher than the average and is the highest for the entire observation time calculated on the interval from the 21st to the 24th cycle of solar activity.