QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3ml

41 km SW of Dillon, Montana

· 1.1 km deep · released about 1.4 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Beaverhead County 21 kmLemhi County 67 kmClark County 94 kmMadison County 96 kmSilver Bow County 106 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 3.3 (ml)
Depth
1.1 km below the surface
Felt
4 reports · strongest reported intensity IV
Nearest
Beaverhead County, 21 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1962 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 4 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 120,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 5,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,800× the energy of this one
  4. This earthquake M 3.3 about 1.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.9× 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.

Where

Epicentre 44.9768, -113.0393. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Beaverhead County, MT 21 km (13 mi) SSW of here earthquakes near Beaverhead County
Lemhi County, ID 67 km (42 mi) E of here earthquakes near Lemhi County
Clark County, ID 94 km (58 mi) NW of here earthquakes near Clark County
Madison County, MT 96 km (60 mi) WSW of here earthquakes near Madison County
Silver Bow County, MT 106 km (66 mi) SSW of here earthquakes near Silver Bow County
Custer County, ID 124 km (77 mi) NE of here earthquakes near Custer County

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

Aftershocks so far

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

  1. 2.2 26 km ENE of Leadore, Idaho
  2. 2.4 32 km ENE of Leadore, Idaho
  3. 1.6 32 km ENE of Leadore, Idaho
  4. 2.4 7 km WNW of Dillon, Montana
  5. 1.6 12 km SSE of Dillon, Montana
  6. 2.2 10 km SSE of Dillon, Montana
  7. 1.6 26 km ENE of Leadore, Idaho
  8. 1.7 29 km WSW of Dillon, Montana
  9. 1.7 28 km WSW of Dillon, Montana
  10. 2.0 28 km WSW of Dillon, Montana
  11. 2.3 33 km WNW of Lima, Montana
  12. 1.7 8 km SSW of Dillon, MT
  13. 1.8 19 km W of Lima, Montana
  14. 2.2 24 km NNE of Lima, Montana
  15. 1.6 30 km NNW of Lima, 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.