M2.5 : 1.13 d
M3.0 : 2.90 d
M3.5 : 7.42 d
M4.0 : 19.0 d
M4.5 : 48.8 d
M5.0 : 125 d
M5.5 : 320 d
M6.0 : 2.25 y
M6.5 : 5.76 y
M7.0 : 14.8 y
M7.5 : 37.8 y
M8.0 : 96.9 y
M8.5 : 248 y
M9.0 : 637 y
Based on 36,019 events. Largest M7.3
n = Events per year with magnitude >= M
M <= 9.0
log10(n) = 4.55 - 0.817*M