M2.5 : 11.3 m
M3.0 : 44.3 m
M3.5 : 2.89 h
M4.0 : 11.3 h
M4.5 : 1.84 d
M5.0 : 7.19 d
M5.5 : 28.1 d
M6.0 : 110 d
M6.5 : 1.18 y
M7.0 : 4.60 y
M7.5 : 18.0 y
M8.0 : 70.2 y
M8.5 : 275 y
M9.0 : 1070 y
Based on 8,672 events. Largest M8.1
n = Events per year with magnitude >= M
M <= 9.0
log10(n) = 7.63 - 1.184*M