Earthquake · reviewed by a seismologist
M 1.5ml
Earthquake near Dillon, MT
No earthquake was likely felt in Dillon in the 24 hours to 3:03 pm MST (22:03 UTC). The last one was M 2.0, 14 km (9 mi) N, at 2:45 pm MDT on 7 May 2026, estimated intensity II (weak) in town. Every earthquake near Dillon
This page: a magnitude 1.5 earthquake was recorded 45 km (28 mi) northeast of Dillon, MT, at 1:08 am MST on 27 February 2022 (08:08 UTC), 4.7 km deep.
USGS: 3 km ESE of Twin Bridges, Montana
- When
- 1:08 am MST on 27 February 2022 ()
- Where
- 45 km (28 mi) northeast of Dillon, MT · earthquakes near Dillon
- Montana today
- every earthquake in Montana in the last 24 hours
- Magnitude
- M 1.5 (ml)
- Depth
- 4.7 km below the surface
- Felt
- no reports yet
- Nearest
- Madison County, 37 km SE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1718 days ago
Earthquake alerts for Dillon, MT
Get a notification in this browser when USGS records an earthquake near Dillon, MT. No account or email needed.
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 minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 9 km (6 mi) from the epicentre. In Dillon, 45 km away, the estimate is intensity I (not felt). 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.
How big was it?
This earthquake released about 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
- Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
- Around the size people start to feel M 3.0 180× the energy of this one
- This earthquake M 1.5 about 5.4 lb of TNT
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 4.0 on 2016-09-03 — about 6,200 times the energy of this one.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.6 16 km N of Dillon, Montana · 32 km SW of this epicentre
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 45.5357, -112.2858. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Madison County, MT | 37 km (23 mi) | SE | earthquakes near Madison County |
| Silver Bow County, MT | 50 km (31 mi) | NW | earthquakes near Silver Bow County |
| Beaverhead County, MT | 65 km (40 mi) | SW | earthquakes near Beaverhead County |
| Jefferson County, MT | 68 km (42 mi) | NNE | earthquakes near Jefferson County |
| Gallatin County, MT | 87 km (54 mi) | E | earthquakes near Gallatin County |
| Deer Lodge County, MT | 91 km (56 mi) | NW | earthquakes near Deer Lodge County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
59 earthquakes have been recorded within 50 km since this one.
- 2.2 30 km NNW of Dillon, Montana
- 2.1 3 km SE of Twin Bridges, Montana
- 2.3 3 km NNW of Pony, Montana
- 2.0 2 km NNW of Pony, Montana
- 2.4 13 km N of Dillon, Montana
- 1.6 23 km N of Dillon, Montana
- 2.4 8 km SSE of Pony, Montana
- 1.6 4 km ESE of Twin Bridges, Montana
- 2.4 3 km SE of Twin Bridges, Montana
- 1.6 13 km E of Dillon, Montana
- 1.5 1 km NNE of Twin Bridges, Montana
- 1.6 12 km NNE of Dillon, Montana
- 1.6 12 km NNE of Dillon, Montana
- 2.0 7 km SE of Pony, Montana
- 1.5 14 km E of Dillon, 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.