M2.5 : 1.44 d
M3.0 : 4.41 d
M3.5 : 13.6 d
M4.0 : 41.7 d
M4.5 : 128 d
M5.0 : 1.08 y
M5.5 : 3.32 y
M6.0 : 10.2 y
M6.5 : 31.4 y
M7.0 : 96.6 y
M7.5 : 297 y
M8.0 : 913 y
M8.5 : 2810 y
Based on 96,872 events. Largest M7.3
n = Events per year with magnitude >= M
M <= 8.5
log10(n) = 4.84 - 0.976*M