M2.5 : 6.28 h
M3.0 : 17.2 h
M3.5 : 1.96 d
M4.0 : 5.37 d
M4.5 : 14.7 d
M5.0 : 40.3 d
M5.5 : 110 d
M6.0 : 302 d
M6.5 : 2.26 y
M7.0 : 6.20 y
M7.5 : 17.0 y
M8.0 : 46.5 y
M8.5 : 127 y
M9.0 : 349 y
Based on 1,456 events. Largest M7.0
n = Events per year with magnitude >= M
M <= 9.0
log10(n) = 5.33 - 0.875*M