April 20, on the border of Iran and Iraq began a series of earthquakes with a magnitude of 3.5 to 5.0. It is rather strange that there were no major earthquakes, but it was only a magnitude of 5. Typically many aftershocks usually appears after 6-6.5 magnitude earthquake, but in this case it was not observed.
If you look at the statistics for the region, there were more strong aftershocks, which ultimately were not accompanied by such an unusual seismic activity. Yes, and also force some aftershocks compared to the first earthquake.