M2.5 : 25.5 m
M3.0 : 1.41 h
M3.5 : 4.65 h
M4.0 : 15.4 h
M4.5 : 2.12 d
M5.0 : 7.03 d
M5.5 : 23.3 d
M6.0 : 77.0 d
M6.5 : 255 d
M7.0 : 2.31 y
M7.5 : 18.2 y
M8.0 : 143 y
M8.5 : 1120 y
Based on 14,214 events. Largest M8.0
n = Events per year with magnitude >= M
M <= 7.0
log10(n) = 6.91 - 1.040*M
7.0 <= M <= 8.5log10(n) = 12.17 - 1.791*M