Helena, United States: 37 earthquakes of magnitude 4.0+ detected within 100 km.
Map
The map centers on Helena and highlights the most recent earthquakes detected within 100 km.
Timeline
| UTC | Magnitude | Region | Depth |
|---|
Monthly profile
Historic snapshot
Strongest years
| Year | Max magnitude | Earthquakes |
|---|---|---|
| 2019 | M 4.2 | 3 |
| 2017 | M 5.8 | 5 |
| 2016 | M 4.3 | 2 |
| 2009 | M 4.0 | 1 |
| 2000 | M 4.1 | 2 |
| 1998 | M 4.3 | 1 |
| 1989 | M 4.0 | 1 |
| 1984 | M 4.0 | 1 |
| 1977 | M 4.6 | 2 |
| 1975 | M 4.0 | 1 |
| 1974 | M 4.4 | 1 |
| 1972 | M 4.2 | 1 |
| 1966 | M 4.8 | 1 |
| 1963 | M 4.5 | 1 |
| 1958 | M 4.4 | 1 |
| 1935 | M 6.1 | 4 |
| 1929 | M 4.7 | 1 |
| 1928 | M 4.9 | 1 |
| 1926 | M 5.4 | 1 |
| 1925 | M 6.6 | 5 |
| 1910 | M 5.4 | 1 |