M2.5 : 42.0 m
M3.0 : 2.39 h
M3.5 : 8.18 h
M4.0 : 1.16 d
M4.5 : 3.98 d
M5.0 : 13.6 d
M5.5 : 46.5 d
M6.0 : 159 d
M6.5 : 1.49 y
M7.0 : 5.09 y
M7.5 : 17.4 y
M8.0 : 59.4 y
M8.5 : 203 y
M9.0 : 695 y
M9.5 : 2370 y
Based on 13,083 events. Largest M7.8
n = Events per year with magnitude >= M
M <= 9.5
log10(n) = 6.77 - 1.068*M