M2.5 : 29.7 m
M3.0 : 2.26 h
M3.5 : 10.4 h
M4.0 : 1.98 d
M4.5 : 9.05 d
M5.0 : 41.4 d
M5.5 : 190 d
M6.0 : 2.38 y
M6.5 : 10.9 y
M7.0 : 49.9 y
M7.5 : 228 y
M8.0 : 1050 y
Based on 2,773 events. Largest M7.0
n = Events per year with magnitude >= M
M <= 8.0
log10(n) = 7.55 - 1.321*M