M2.5 : 42.4 m
M3.0 : 2.46 h
M3.5 : 8.57 h
M4.0 : 1.24 d
M4.5 : 4.33 d
M5.0 : 15.1 d
M5.5 : 52.6 d
M6.0 : 183 d
M6.5 : 1.75 y
M7.0 : 6.09 y
M7.5 : 21.2 y
M8.0 : 74.0 y
M8.5 : 258 y
M9.0 : 898 y
M9.5 : 3130 y
Based on 83,779 events. Largest M8.3
n = Events per year with magnitude >= M
M <= 9.5
log10(n) = 6.80 - 1.084*M