M2.5 : 8.17 h
M3.0 : 1.08 d
M3.5 : 3.46 d
M4.0 : 11.0 d
M4.5 : 35.1 d
M5.0 : 112 d
M5.5 : 357 d
M6.0 : 3.12 y
M6.5 : 9.94 y
M7.0 : 31.7 y
M7.5 : 101 y
M8.0 : 322 y
M8.5 : 1030 y
Based on 605,381 events. Largest M7.5
n = Events per year with magnitude >= M
M <= 8.5
log10(n) = 5.55 - 1.007*M