M2.5 : 4.63 m
M3.0 : 26.6 m
M3.5 : 2.54 h
M4.0 : 14.5 h
M4.5 : 3.48 d
M5.0 : 19.9 d
M5.5 : 114 d
M6.0 : 1.79 y
M6.5 : 10.3 y
M7.0 : 59.0 y
M7.5 : 338 y
M8.0 : 1940 y
Based on 2,691 events. Largest M7.0
n = Events per year with magnitude >= M
M <= 8.0
log10(n) = 8.85 - 1.517*M