M2.5 : 1.01 h
M3.0 : 3.41 h
M3.5 : 11.5 h
M4.0 : 1.63 d
M4.5 : 5.50 d
M5.0 : 18.6 d
M5.5 : 62.9 d
M6.0 : 213 d
M6.5 : 1.97 y
M7.0 : 6.67 y
M7.5 : 22.6 y
M8.0 : 76.3 y
M8.5 : 258 y
M9.0 : 873 y
Based on 6,862 events. Largest M8.1
n = Events per year with magnitude >= M
M <= 9.0
log10(n) = 6.59 - 1.059*M