QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

23 km NNW of Dillon, Montana

· 5.9 km deep · released about 20 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Beaverhead County 36 kmSilver Bow County 52 kmMadison County 62 kmDeer Lodge County 82 kmJefferson County 92 kmLemhi County 108 kmGallatin County 120 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 1.9 (ml)
Depth
5.9 km below the surface
Felt
no reports yet
Nearest
Beaverhead County, 36 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3075 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 20 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 760,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 540,000× the energy of this one
  3. Around the size people start to feel M 3.0 48× the energy of this one
  4. This earthquake M 1.9 about 20 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 45.4252, -112.6963. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Beaverhead County, MT 36 km (22 mi) NNE of here earthquakes near Beaverhead County
Silver Bow County, MT 52 km (33 mi) S of here earthquakes near Silver Bow County
Madison County, MT 62 km (39 mi) W of here earthquakes near Madison County
Deer Lodge County, MT 82 km (51 mi) SSE of here earthquakes near Deer Lodge County
Jefferson County, MT 92 km (57 mi) SSW of here earthquakes near Jefferson County
Lemhi County, ID 108 km (67 mi) ENE of here earthquakes near Lemhi County

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

Aftershocks so far

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

  1. 1.6 17 km ESE of Dillon, Montana
  2. 1.5 16 km E of Dillon, Montana
  3. 1.6 17 km ESE of Dillon, Montana
  4. 1.5 19 km N of Dillon, Montana
  5. 1.5 30 km W of Dillon, Montana
  6. 1.6 18 km NNE of Dillon, Montana
  7. 2.1 27 km W of Dillon, Montana
  8. 1.7 18 km NNE of Dillon, Montana
  9. 2.3 17 km N of Dillon, Montana
  10. 1.6 17 km ESE of Dillon, Montana
  11. 1.7 10 km SW of Twin Bridges, Montana
  12. 1.7 17 km ESE of Dillon, Montana
  13. 1.6 17 km ESE of Dillon, Montana
  14. 1.5 16 km ESE of Dillon, Montana
  15. 1.7 17 km ESE 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

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