M2.5 : 5.6 d
M3.0 : 18.6 d
M3.5 : 62.2 d
M4.0 : 208 d
M4.5 : 1.9 y
M5.0 : 12.7 y
M5.5 : 85.6 y
M6.0 : 575 y
M6.5 : 3865 y
Based on 3,882 events. Largest M5.4
n = Events per year with magnitude >= M
M <= 4.5
log10(n) = 4.43 - 1.047*M
4.5 <= M <= 6.5log10(n) = 7.17 - 1.655*M