M2.5 : 1.72 h
M3.0 : 8.11 h
M3.5 : 1.60 d
M4.0 : 7.56 d
M4.5 : 35.7 d
M5.0 : 169 d
M5.5 : 2.19 y
M6.0 : 10.4 y
M6.5 : 48.9 y
M7.0 : 231 y
M7.5 : 1090 y
Based on 911 events. Largest M6.6
n = Events per year with magnitude >= M
M <= 7.5
log10(n) = 7.08 - 1.349*M