M2.5 : 27.3 m
M3.0 : 1.58 h
M3.5 : 5.49 h
M4.0 : 19.0 h
M4.5 : 2.76 d
M5.0 : 9.57 d
M5.5 : 33.2 d
M6.0 : 115 d
M6.5 : 1.10 y
M7.0 : 3.81 y
M7.5 : 13.2 y
M8.0 : 45.9 y
M8.5 : 159 y
M9.0 : 553 y
M9.5 : 1920 y
Based on 13,447 events. Largest M8.3
n = Events per year with magnitude >= M
M <= 9.5
log10(n) = 6.99 - 1.081*M