M2.5 : 13.2 d
M3.0 : 44.2 d
M3.5 : 147 d
M4.0 : 1.35 y
M4.5 : 4.49 y
M5.0 : 15.0 y
M5.5 : 50.0 y
M6.0 : 167 y
M6.5 : 557 y
M7.0 : 1860 y
M7.5 : 6200 y
M8.0 : 20700 y
Based on 12,797 events. Largest M7.8
n = Events per year with magnitude >= M
M <= 8.0
log10(n) = 4.06 - 1.047*M