Earthquake · reviewed by a seismologist
M 3.2ml
Earthquake near Malmstrom Air Force Base, MT
No earthquake was likely felt in Malmstrom Air Force Base in the 24 hours to 1:29 am MST (08:29 UTC). The last one was M 3.7, 14 km (9 mi) NW, at 7:40 am MDT on 18 September 2026, estimated intensity III (weak) in town; 176 felt reports to USGS. Every earthquake near Malmstrom Air Force Base
This page: a magnitude 3.2 earthquake was recorded 3 km (2 mi) northwest of Malmstrom Air Force Base, MT, at 6:22 pm MST on 31 January 2026 (01:22 UTC), 13 km deep. 199 people have reported feeling it to USGS.
USGS: 3 km NW of Malmstrom Air Force Base, Montana
7 km (5 mi) ENE of Great Falls, MT
- When
- 6:22 pm MST on 31 January 2026 ()
- Where
- 3 km (2 mi) northwest of Malmstrom Air Force Base, MT · earthquakes near Malmstrom Air Force Base
- Montana today
- every earthquake in Montana in the last 24 hours
- Magnitude
- M 3.2 (ml)
- Depth
- 13 km below the surface
- Felt
- 199 reports · strongest reported intensity III
- Nearest
- Cascade County, 26 km SSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 202 days ago
Earthquake alerts for Malmstrom Air Force Base, MT
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 45 km (28 mi) from the epicentre. In Malmstrom Air Force Base, 3 km away, the estimate is intensity III (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
Likely felt in: Great Falls 8 km, intensity III. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 1,900 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 180,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 7,900× the energy of this one
- Magna, Utah 2020 M 5.7 5,600× the energy of this one
- This earthquake M 3.2 about 1,900 lb of TNT
- Around the size people start to feel M 3.0 this one released 2× more
Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.
For this area
The largest earthquake within 50 km since 2016 was M 4.2 on 2026-01-29 — about 32 times the energy of this one.
Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.
Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.
Where
Epicentre 47.5295, -111.2090. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Cascade County, MT | 26 km (16 mi) | SSW | earthquakes near Cascade County |
| Chouteau County, MT | 70 km (44 mi) | NE | earthquakes near Chouteau County |
| Teton County, MT | 87 km (54 mi) | WNW | earthquakes near Teton County |
| Judith Basin County, MT | 88 km (55 mi) | SE | earthquakes near Judith Basin County |
| Lewis and Clark County, MT | 99 km (62 mi) | WSW | earthquakes near Lewis and Clark County |
| Meagher County, MT | 107 km (67 mi) | SSE | earthquakes near Meagher County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
5 earthquakes have been recorded within 50 km since this one.
- 3.7 7 km NNW of Black Eagle, Montana
- 2.4 9 km NNE of Black Eagle, Montana
- 1.9 9 km N of Black Eagle, Montana
- 2.6 10 km NNE of Black Eagle, Montana
- 3.7 3 km SE of Black Eagle, Montana
Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.
On USGS
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.