QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2ml

16 km E of Dillon, Montana

· 9.8 km deep · released about 2,000 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Beaverhead County 38 kmMadison County 42 kmSilver Bow County 76 kmJefferson County 103 kmGallatin County 104 kmClark County 105 kmDeer Lodge County 111 kmLemhi County 119 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 3.2 (ml)
Depth
9.8 km below the surface
Felt
no reports yet
Nearest
Beaverhead County, 38 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1963 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 2,000 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 170,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 7,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 5,400× the energy of this one
  4. This earthquake M 3.2 about 2,000 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 2.1× 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 45.2320, -112.4320. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Beaverhead County, MT 38 km (23 mi) ENE of here earthquakes near Beaverhead County
Madison County, MT 42 km (26 mi) WSW of here earthquakes near Madison County
Silver Bow County, MT 76 km (47 mi) SSE of here earthquakes near Silver Bow County
Jefferson County, MT 103 km (64 mi) SSW of here earthquakes near Jefferson County
Gallatin County, MT 104 km (65 mi) WSW of here earthquakes near Gallatin County
Clark County, ID 105 km (65 mi) N of here earthquakes near Clark County

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

Aftershocks so far

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

  1. 2.6 15 km N of Dillon, Montana
  2. 2.0 34 km SE of Dillon, Montana
  3. 1.7 29 km WSW of Dillon, Montana
  4. 1.7 28 km WSW of Dillon, Montana
  5. 2.0 28 km WSW of Dillon, Montana
  6. 1.9 33 km WNW of Twin Bridges, Montana
  7. 1.7 8 km SSW of Dillon, MT
  8. 2.8 8 km NE of Alder, Montana
  9. 1.9 23 km NNW of Dillon, Montana
  10. 1.6 16 km ESE of Dillon, Montana
  11. 1.6 30 km NE of Lima, Montana
  12. 1.5 30 km NE of Lima, Montana
  13. 3.5 27 km NE of Lima, Montana
  14. 1.5 34 km S of Virginia City, Montana
  15. 2.3 16 km NNE 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.