M2.5 : 54.0 m
M3.0 : 3.14 h
M3.5 : 11.0 h
M4.0 : 1.60 d
M4.5 : 5.58 d
M5.0 : 19.5 d
M5.5 : 68.0 d
M6.0 : 238 d
M6.5 : 2.27 y
M7.0 : 7.93 y
M7.5 : 27.7 y
M8.0 : 96.8 y
M8.5 : 338 y
M9.0 : 1180 y
Based on 57,428 events. Largest M7.6
n = Events per year with magnitude >= M
M <= 9.0
log10(n) = 6.70 - 1.086*M