Earthquake Information for Helena, Montana

Helena, MT has a high earthquake risk, with a total of 226 earthquakes since 1931. The USGS database shows that there is a 51.58% chance of a major earthquake within 50km of Helena, MT within the next 50 years. The largest earthquake within 30 miles of Helena, MT was a 3.9 Magnitude in 1975.

Risk Level:
High

Total Number of Earthquakes in Helena since 1931 within 30 miles

226

Probability of A 5.0 Earthquake within next 50 years

51.58%

Most Recent
Largest

4/19/2024 - 0.6 mag, 9.8mi depth 16.6424 mi from Winston, MT
2/14/2024 - 2.0 mag, -2.0mi depth 4.66524 mi from Townsend, MT
1/26/2024 - 0.4 mag, 10.4mi depth 3.86656 mi from Marysville, MT
10/10/2023 - 0.9 mag, -2.0mi depth 0.9172 mi from South Hills, MT
5/26/2022 - 0.2 mag, 8.4mi depth 2.98304 mi from Marysville, MT
2/10/2022 - 1.1 mag, -2.0mi depth 4.63013 mi from Townsend, MT
12/2/2021 - 1.9 mag, -2.0mi depth 5.42849 mi from Townsend, MT
10/26/2021 - 1.9 mag, -2.0mi depth 5.2829 mi from Townsend, MT
10/12/2021 - 1.8 mag, -2.0mi depth 5.36269 mi from Townsend, MT
10/6/2021 - 1.2 mag, 6.0mi depth 3.50547 mi from Elkhorn, MT
8/28/2021 - 2.9 mag, 5.4mi depth 6.59797 mi from Winston, MT
8/12/2021 - 1.7 mag, -2.0mi depth 4.83454 mi from Townsend, MT
8/3/2021 - 1.1 mag, -2.0mi depth 3.75908 mi from Townsend, MT
7/6/2021 - 1.7 mag, 12.1mi depth 9.8412 mi from Marysville, MT
6/22/2021 - 1.6 mag, -2.0mi depth 5.53359 mi from Townsend, MT
6/10/2021 - 1.4 mag, -2.0mi depth 4.26698 mi from Townsend, MT
6/3/2021 - 1.5 mag, -2.0mi depth 4.34361 mi from The Silos, MT
5/24/2021 - 2.6 mag, 1.7mi depth 3.61691 mi from Avon, MT
4/20/2021 - 0.9 mag, -2.0mi depth 4.52206 mi from The Silos, MT
4/19/2021 - 1.3 mag, -2.0mi depth 5.89452 mi from Townsend, MT
3/24/2021 - 3.1 mag, 4.8mi depth 9.41534 mi from Marysville, MT
1/27/2021 - 0.1 mag, 12.4mi depth 10.2959 mi from Lincoln, MT
1/26/2021 - 1.1 mag, 4.4mi depth 8.26825 mi from Avon, MT
1/25/2021 - -0.4 mag, 10.5mi depth 10.134 mi from Lincoln, MT
1/17/2021 - 1.1 mag, 13.4mi depth 9.96265 mi from Lincoln, MT
1/6/2021 - 1.4 mag, 1.7mi depth 7.7696 mi from Avon, MT
11/28/2020 - 0.9 mag, 16.1mi depth 11.4457 mi from Marysville, MT
11/24/2020 - 1.3 mag, 5.3mi depth 7.35764 mi from Avon, MT
11/15/2020 - 0.3 mag, 13.7mi depth 9.94266 mi from Lincoln, MT
7/22/2020 - 1.6 mag, -2.0mi depth 4.38656 mi from Townsend, MT
6/4/2020 - 0.6 mag, -2.0mi depth 2.15083 mi from Townsend, MT
4/19/2020 - 2.6 mag, 10.0mi depth 2.95033 mi from Boulder, MT
4/17/2020 - 2.8 mag, 10.0mi depth 3.682 mi from Boulder, MT
2/4/2020 - 2.0 mag, 14.6mi depth 10.7731 mi from Lincoln, MT
1/30/2020 - 3.3 mag, 5.0mi depth 7.29342 mi from Helena Valley Northwest, MT
12/17/2019 - 1.6 mag, -3.0mi depth 15.1687 mi from Helena Valley Northwest, MT
7/30/2019 - 1.4 mag, -2.0mi depth 3.21112 mi from Montana City, MT
6/18/2019 - 1.7 mag, -2.0mi depth 2.80948 mi from Montana City, MT
6/11/2019 - 1.5 mag, 15.5mi depth 9.60429 mi from Lincoln, MT
5/20/2019 - 0.9 mag, 10.0mi depth 15.6777 mi from Lincoln, MT
5/15/2019 - 0.9 mag, 12.1mi depth 10.3971 mi from Lincoln, MT
5/8/2019 - 1.2 mag, 4.7mi depth 16.6278 mi from Helena Valley Northeast, MT
5/8/2019 - -0.6 mag, 9.1mi depth 10.6966 mi from Helena West Side, MT
5/4/2019 - 1.4 mag, 9.8mi depth 4.45729 mi from Helena Valley Northwest, MT
5/1/2019 - 1.6 mag, -2.0mi depth 4.80295 mi from Townsend, MT
3/20/2019 - 2.6 mag, 14.8mi depth 13.3668 mi from Lincoln, MT
2/4/2019 - 2.0 mag, 12.4mi depth 12.8076 mi from Helena West Side, MT
10/11/2018 - 1.8 mag, -2.0mi depth 4.63809 mi from Townsend, MT
9/23/2018 - 2.7 mag, 9.7mi depth 10.3488 mi from Lincoln, MT
9/20/2018 - 1.3 mag, -2.0mi depth 4.39916 mi from Townsend, MT

7/6/2017 - 3.9 mag, 10.8mi depth 12.8981 mi from Lincoln, MT
7/18/1975 - 3.9 mag, 5.0mi depth 3.0031 mi from Helena Valley Northwest, MT
2/13/1976 - 3.8 mag, 1.0mi depth 3.6178 mi from Helena Valley Northwest, MT
3/12/2017 - 3.8 mag, 19.6mi depth 14.7881 mi from Deer Lodge, MT
1/16/2011 - 3.7 mag, 15.2mi depth 6.4254 mi from Marysville, MT
7/16/1986 - 3.6 mag, 5.0mi depth 4.8037 mi from Jefferson City, MT
7/16/1986 - 3.6 mag, 5.0mi depth 4.9677 mi from Jefferson City, MT
7/19/1975 - 3.5 mag, 5.0mi depth 3.049 mi from Helena Valley West Central, MT
10/24/1986 - 3.5 mag, 3.4mi depth 4.6775 mi from Elkhorn, MT
10/18/1986 - 3.5 mag, 5.0mi depth 3.5808 mi from Elkhorn, MT
3/12/2017 - 3.5 mag, 12.2mi depth 15.9887 mi from Deer Lodge, MT
11/26/1982 - 3.4 mag, 5.0mi depth 2.1488 mi from Elkhorn, MT
2/3/2016 - 3.4 mag, 2.0mi depth 4.5893 mi from Clancy, MT
11/22/2017 - 3.4 mag, 8.1mi depth 12.1992 mi from Lincoln, MT
10/3/2015 - 3.4 mag, 4.3mi depth 5.03827 mi from Helena Valley Northwest, MT
11/9/1986 - 3.3 mag, 5.0mi depth 1.7875 mi from Boulder, MT
1/30/2020 - 3.3 mag, 5.0mi depth 7.29342 mi from Helena Valley Northwest, MT
10/19/1986 - 3.3 mag, 5.0mi depth 3.3258 mi from Elkhorn, MT
2/25/1989 - 3.2 mag, 5.0mi depth 10.3704 mi from Lincoln, MT
9/4/1977 - 3.2 mag, 5.0mi depth 1.4664 mi from Helena West Side, MT
10/31/1995 - 3.2 mag, 10.6mi depth 8.4466 mi from Marysville, MT
6/16/1999 - 3.2 mag, 3.9mi depth 9.9691 mi from Craig, MT
10/18/1986 - 3.2 mag, 5.0mi depth 4.9091 mi from Elkhorn, MT
7/6/2008 - 3.1 mag, 12.1mi depth 3.7904 mi from Elkhorn, MT
2/3/1993 - 3.1 mag, 23.0mi depth 8.8961 mi from Marysville, MT
7/18/1975 - 3.1 mag, 5.0mi depth 3.8013 mi from Helena Valley West Central, MT
12/3/1986 - 3.1 mag, 0.0mi depth 9.1676 mi from Jefferson City, MT
3/24/2021 - 3.1 mag, 4.8mi depth 9.41534 mi from Marysville, MT
12/6/2015 - 3.1 mag, 3.0mi depth 5.44792 mi from Clancy, MT
6/18/2015 - 3.0 mag, 10.6mi depth 7.86535 mi from Helena Valley Northwest, MT
6/20/2016 - 3.0 mag, -2.8mi depth 8.0911 mi from Helena West Side, MT
4/18/2009 - 3.0 mag, 21.8mi depth 7.3497 mi from Marysville, MT
3/22/2003 - 2.9 mag, 10.3mi depth 3.0942 mi from Helena Valley West Central, MT
12/26/1998 - 2.9 mag, 5.8mi depth 5.2446 mi from Jefferson City, MT
12/19/1994 - 2.9 mag, 6.3mi depth 1.8688 mi from Marysville, MT
9/13/2012 - 2.9 mag, 9.1mi depth 8.3198 mi from Helena Valley Northeast, MT
5/31/2007 - 2.9 mag, 5.3mi depth 11.9719 mi from Lincoln, MT
8/28/2021 - 2.9 mag, 5.4mi depth 6.59797 mi from Winston, MT
7/29/2015 - 2.9 mag, 12.9mi depth 11.1775 mi from Deer Lodge, MT
10/14/2009 - 2.9 mag, 27.6mi depth 4.216 mi from Avon, MT
9/28/2009 - 2.9 mag, 24.0mi depth 4.0588 mi from Avon, MT
4/11/2010 - 2.8 mag, 17.8mi depth 19.6745 mi from Helena Valley Northeast, MT
12/2/2010 - 2.8 mag, 14.3mi depth 6.4993 mi from Marysville, MT
6/4/2003 - 2.8 mag, 16.2mi depth 6.0518 mi from Marysville, MT
4/17/2020 - 2.8 mag, 10.0mi depth 3.682 mi from Boulder, MT
1/5/2010 - 2.8 mag, 11.6mi depth 4.4439 mi from Helena Valley Northwest, MT
9/23/2018 - 2.7 mag, 9.7mi depth 10.3488 mi from Lincoln, MT
2/10/2015 - 2.7 mag, 3.2mi depth 2.9267 mi from Helena Valley West Central, MT
10/7/1978 - 2.7 mag, 5.0mi depth 1.4821 mi from Helena West Side, MT
1/1/1999 - 2.7 mag, 5.4mi depth 5.0355 mi from Jefferson City, MT

View All

Earthquake Probability for Helena, MT

View the probability of a major earthquake within the next 50 years in Helena, MT.

Probability of Earthquakes Within the Next 50 Years For Magnitudes Between 5.0 and 9.2

(within 31 km/51 miles above magnitude)

5.0

51.58%

5.1

45.41%

5.2

45.41%

5.2

39.69%

5.3

34.47%

5.4

29.78%

5.5

25.63%

5.6

22.00%

5.7

18.84%

5.8

16.11%

5.9

13.78%

6.0

11.78%

6.1

9.88%

6.2

8.27%

6.3

6.87%

6.4

5.67%

6.5

4.61%

6.6

3.47%

6.7

2.49%

6.8

1.57%

6.9

0.74%

7.0

0.11%

7.1

0.04%

7.2

0.01%

7.3

0.00%

7.4

0.00%

7.5

0.00%

7.6

0.00%

7.7

0.00%

7.8

0.00%

7.9

0.00%

8.0

0.00%

8.1

0.00%

8.2

0.00%

8.3

0.00%

8.4

0.00%

8.5

0.00%

8.6

0.00%

8.7

0.00%

8.8

0.00%

8.9

0.00%

9.0

0.00%

9.1

0.00%

9.2

0.00%

Earthquake Count for Helena, MT

View the number of earthquake incidents in Helena, MT by year that are more than 2.5 Magnitude.

List of Earthquake Incidents for Helena, MT

Total Number of Earthquakes in Helena, MT within 30 miles. All distances and depths in the table are measured in miles.

04/19/2024

0.6

9.8

16.64

Earthquake Information for Helena, Montana

Earthquake Probability for Helena, MT

Probability of Earthquakes Within the Next 50 Years For Magnitudes Between 5.0 and 9.2

Earthquake Count for Helena, MT

List of Earthquake Incidents for Helena, MT

Risk Of Natural Disasters In Helena, MT

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