M2.5 : 1.46 d
M3.0 : 4.63 d
M3.5 : 14.7 d
M4.0 : 46.5 d
M4.5 : 147 d
M5.0 : 1.28 y
M5.5 : 4.05 y
M6.0 : 12.8 y
M6.5 : 40.7 y
M7.0 : 129 y
M7.5 : 408 y
M8.0 : 1290 y
M8.5 : 4100 y
Based on 71,548 events. Largest M7.3
n = Events per year with magnitude >= M
M <= 8.5
log10(n) = 4.90 - 1.002*M