From THE horse's mouth FYI
https://www.iris.edu/hq/inclass/fact-sheet/how_often_do_earthquakes_occur


" On average, Magnitude 2 and smaller earthquakes occur several hundred times a day world wide. Major earthquakes, greater than magnitude 7, happen more than once per month. "Great earthquakes", magnitude 8 and higher, occur about once a year."


If writing ever becomes work I think I'm going to have to stop