M2.5 : 38.8 d
M3.0 : 130 d
M3.5 : 1.20 y
M4.0 : 4.04 y
M4.5 : 13.6 y
M5.0 : 45.7 y
M5.5 : 154 y
M6.0 : 517 y
M6.5 : 1740 y
Based on 1,881 events. Largest M5.5
n = Events per year with magnitude >= M
M <= 6.5
log10(n) = 3.61 - 1.054*M
Sweetwater Valley
log10(n) = 3.61 - 1.054*M