M2.5 : 3.5 m
M3.0 : 20.9 m
M3.5 : 2.1 h
M4.0 : 12.3 h
M4.5 : 3.0 d
M5.0 : 18.0 d
M5.5 : 107 d
M6.0 : 1.74 y
M6.5 : 10.3 y
M7.0 : 61.5 y
M7.5 : 365 y
M8.0 : 2170 y
Based on 2,825 events. Largest M7.0
n = Events per year with magnitude >= M
M <= 8.0
log10(n) = 9.04 - 1.548*M