M2.5 : 15.0 m
M3.0 : 57.0 m
M3.5 : 3.62 h
M4.0 : 13.8 h
M4.5 : 2.20 d
M5.0 : 8.38 d
M5.5 : 32.0 d
M6.0 : 122 d
M6.5 : 1.27 y
M7.0 : 4.85 y
M7.5 : 18.5 y
M8.0 : 70.6 y
M8.5 : 269 y
M9.0 : 1030 y
Based on 14,672 events. Largest M7.8
n = Events per year with magnitude >= M
M <= 9.0
log10(n) = 7.45 - 1.163*M