St. Ignatius Earthquake Information

St. Ignatius Earthquake Risk Grade

The USGS database shows that there is a 66.715% chance of a major earthquake within 50 miles of St. Ignatius, Montana within the next 50 years. The largest earthquake within 50 miles of St. Ignatius, Montana was a 4.9 Magnitude in 1978.

Probability of earthquakes within the next 50 years

Within 31 Miles / 50km above magnitude

Magnitude
Probability
5.0
66.715%
5.1
60.188%
5.2
53.794%
5.3
47.698%
5.4
42.021%
5.5
36.832%
Click To View More Magnitudes
5.6
32.164%
5.7
28.020%
5.8
24.380%
5.9
21.213%
6.0
18.478%
6.1
15.710%
6.2
13.336%
6.3
11.193%
6.4
9.259%
6.5
7.428%
6.6
5.645%
6.7
4.164%
6.8
2.943%
6.9
1.892%
7.0
0.936%
7.1
0.769%
7.2
0.572%
7.3
0.437%
7.4
0.208%
7.5
0.094%
7.6
0.032%
7.7
0.008%
7.8
0.001%
7.9
0.000%
8.0
0.000%
8.1
0.000%
8.2
0.000%
8.3
0.000%
8.4
0.000%
8.5
0.000%
8.6
0.000%
8.7
0.000%
8.8
0.000%
8.9
0.000%
9.0
0.000%
9.1
0.000%
9.2
0.000%

Historical Earthquake Data (Within 50 Miles)

All distances and depths in the table below are measured in miles.