M2.5 : 1.57 h
M3.0 : 6.68 h
M3.5 : 1.19 d
M4.0 : 5.06 d
M4.5 : 21.6 d
M5.0 : 91.9 d
M5.5 : 1.07 y
M6.0 : 4.57 y
M6.5 : 19.5 y
M7.0 : 83.0 y
M7.5 : 354 y
M8.0 : 1510 y
Based on 1,357 events. Largest M7.0
n = Events per year with magnitude >= M
M <= 8.0
log10(n) = 6.90 - 1.259*M