QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

12 km E of Dillon, Montana

· 7.9 km deep · released about 340 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Beaverhead County 34 kmMadison County 45 kmSilver Bow County 76 kmClark County 104 kmJefferson County 105 kmGallatin County 107 kmDeer Lodge County 110 kmLemhi County 116 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 2.7 (ml)
Depth
7.9 km below the surface
Felt
7 reports · strongest reported intensity IV
Nearest
Beaverhead County, 34 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 643 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 7 people have reported feeling it to USGS.

How big was it?

This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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.

Where

Epicentre 45.2249, -112.4725. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Beaverhead County, MT 34 km (21 mi) ENE of here earthquakes near Beaverhead County
Madison County, MT 45 km (28 mi) WSW of here earthquakes near Madison County
Silver Bow County, MT 76 km (47 mi) S of here earthquakes near Silver Bow County
Clark County, ID 104 km (65 mi) N of here earthquakes near Clark County
Jefferson County, MT 105 km (65 mi) SSW of here earthquakes near Jefferson County
Gallatin County, MT 107 km (67 mi) WSW of here earthquakes near Gallatin County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

24 earthquakes have been recorded within 50 km since this one.

  1. 2.1 26 km SE of Dillon, Montana
  2. 2.0 13 km N of Dillon, Montana
  3. 1.6 11 km NNE of Dillon, Montana
  4. 2.5 9 km NNE of Dillon, Montana
  5. 1.5 14 km NNE of Dillon, Montana
  6. 2.5 10 km NNE of Dillon, Montana
  7. 1.8 27 km SW of Dillon, Montana
  8. 1.6 16 km SSW of Dillon, Montana
  9. 1.5 12 km N of Dillon, Montana
  10. 1.7 17 km NNE of Dillon, Montana
  11. 2.2 30 km NNW of Dillon, Montana
  12. 2.1 3 km SE of Twin Bridges, Montana
  13. 1.9 37 km SW of Dillon, Montana
  14. 2.4 13 km N of Dillon, Montana
  15. 1.6 23 km N 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.1 on 2024-10-07 — it released about 130 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.