M2.5 : 25.7 m
M3.0 : 1.65 h
M3.5 : 6.31 h
M4.0 : 1.01 d
M4.5 : 3.88 d
M5.0 : 14.9 d
M5.5 : 57.1 d
M6.0 : 219 d
M6.5 : 2.31 y
M7.0 : 8.85 y
M7.5 : 34.0 y
M8.0 : 130 y
M8.5 : 501 y
Based on 18,086 events. Largest M8.0
n = Events per year with magnitude >= M
M <= 8.5
log10(n) = 7.23 - 1.168*M