M2.5 : 2.01 h
M3.0 : 6.54 h
M3.5 : 21.2 h
M4.0 : 2.88 d
M4.5 : 9.35 d
M5.0 : 30.4 d
M5.5 : 98.8 d
M6.0 : 321 d
M6.5 : 2.86 y
M7.0 : 9.29 y
M7.5 : 30.2 y
M8.0 : 98.2 y
M8.5 : 319 y
M9.0 : 1040 y
M9.5 : 3370 y
Based on 4,255 events. Largest M8.6
n = Events per year with magnitude >= M
M <= 9.5
log10(n) = 6.20 - 1.024*M