Has anyone looked to see if there is a pattern to the frequency or severity of earthquakes?

Question

I wonder if there has ever been a statistical look at earthquake frequency or severity to see if the occurrences are random or if there is some pattern to them. Do small tremors predict larger ones? Does the average length between quakes differ from one area to another? Is that figure significant (statistically speaking).

Answer 1

I am sure the government has many people looking at this.

They are called the National Geological Survey team.