M2.5 : 1.58 h
M3.0 : 6.59 h
M3.5 : 1.15 d
M4.0 : 4.80 d
M4.5 : 20.1 d
M5.0 : 83.8 d
M5.5 : 351 d
M6.0 : 4.01 y
M6.5 : 16.8 y
M7.0 : 70.1 y
M7.5 : 293 y
M8.0 : 1230 y
Based on 2,319 events. Largest M6.7
n = Events per year with magnitude >= M
M <= 8.0
log10(n) = 6.85 - 1.242*M