Montana earthquakes

M3.9 earthquake 13 km N of Dillon, Montana

A magnitude 3.9 earthquake struck 13 km N of Dillon, Montana on Mon, Jul 28, 2014, 6:51 AM MDT (12:51 UTC), 10 km (6 mi) below the surface.

Automatic solution: the magnitude and location may still be revised.

Dillon forecastMore in Montana

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
3.9 (mc), minor
Local time
UTC
2014-07-28 12:51:29 UTC
Depth
9.8 km (6.1 mi), shallow
Epicenter
45.340° N, 112.608° W
Region
Montana
Felt reports
29
Strongest shaking
IV, light shaking
Tsunami flag
No
Status
Automatic solution, may be revised

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated
IV, light shaking
Map
Automatic
USGS ShakeMap: estimated shaking intensity around the epicenter
Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

29 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

Did You Feel It? map: shaking reported by the public
Shaking reported by the public, by area. Map: USGS Did You Feel It?

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting
Strike-slip
Moment magnitude
3.8 Mwr
Nodal plane 1
Strike 81°, dip 74°, rake 174°
Nodal plane 2
Strike 173°, dip 85°, rake 16°

How well it is located

An automatic solution; a seismologist may revise it.

Location uncertainty
About 0.4 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.50
Station coverage gap
34°
Stations used
72

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 9 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 1.631 km SSW of Dillon, Montana · 4435 days ago · 4 km deep · 45 km away
  2. 1.518 km N of Dillon, Montana · 4430 days ago · 9 km deep · 5 km away
  3. 2.313 km ESE of Harrison, Montana · 4430 days ago · 13 km deep · 83 km away
  4. 1.619 km N of Salmon, Idaho · 4429 days ago · 9 km deep · 99 km away
  5. 2.143 km NNE of Spencer, Idaho · 4420 days ago · 15 km deep · 90 km away
  6. 1.816 km NNE of Cardwell, Montana · 4410 days ago · 11 km deep · 93 km away
  7. 2.018 km N of Salmon, Idaho · 4406 days ago · 25 km deep · 99 km away
  8. 1.816 km NE of Twin Bridges, Montana · 4396 days ago · 10 km deep · 48 km away
  9. 1.527 km SW of Lima, Montana · 4385 days ago · 10 km deep · 99 km away

Before

  1. 2.218 km NNE of Dillon, Montana · 4444 days ago · 10 km deep · 4 km away
  2. 1.740 km WNW of Hebgen Lake Estates, Montana · 4448 days ago · 7 km deep · 88 km away
  3. 1.714 km NNE of Dillon, Montana · 4454 days ago · 11 km deep · 2 km away
  4. 1.841 km WNW of Hebgen Lake Estates, Montana · 4459 days ago · 7 km deep · 87 km away
  5. 1.641 km WNW of Hebgen Lake Estates, Montana · 4459 days ago · 6 km deep · 87 km away
  6. 1.610 km WSW of Lima, Montana · 4461 days ago · 13 km deep · 82 km away
  7. 2.414 km NNW of Lima, Montana · 4462 days ago · 12 km deep · 65 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event mb30664 (also filed as usb000rxxz). Read Tue, Sep 22, 2026, 5:15 PM UTC.