<Ul> <Li> N (\ displaystyle N) is the number of events greater or equal to M (\ displaystyle M) </Li> <Li> M (\ displaystyle M) is magnitude </Li> <Li> a (\ displaystyle a) and b (\ displaystyle b) are constants </Li> </Ul> <Li> N (\ displaystyle N) is the number of events greater or equal to M (\ displaystyle M) </Li> <Li> M (\ displaystyle M) is magnitude </Li> <Li> a (\ displaystyle a) and b (\ displaystyle b) are constants </Li>

When does an aftershock happen after an earthquake