M2.5 : 1.53 h
M3.0 : 6.83 h
M3.5 : 1.27 d
M4.0 : 5.69 d
M4.5 : 25.4 d
M5.0 : 114 d
M5.5 : 1.39 y
M6.0 : 6.22 y
M6.5 : 27.8 y
M7.0 : 124 y
M7.5 : 556 y
Based on 1,439 events. Largest M6.6
n = Events per year with magnitude >= M
M <= 7.5
log10(n) = 7.01 - 1.301*M