QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2ml

21 km NW of Lima, Montana

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

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Beaverhead County 40 kmClark County 64 kmMadison County 89 kmLemhi County 90 kmJefferson County 115 kmFremont 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
8.5 km below the surface
Felt
no reports yet
Nearest
Beaverhead County, 40 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1562 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 44.7857, -112.7585. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Beaverhead County, MT 40 km (25 mi) SSE of here earthquakes near Beaverhead County
Clark County, ID 64 km (40 mi) NNW of here earthquakes near Clark County
Madison County, MT 89 km (56 mi) SW of here earthquakes near Madison County
Lemhi County, ID 90 km (56 mi) E of here earthquakes near Lemhi County
Jefferson County, ID 115 km (72 mi) NNW of here earthquakes near Jefferson County
Fremont County, ID 119 km (74 mi) WNW of here earthquakes near Fremont County

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

Aftershocks so far

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

  1. 2.0 28 km WSW of Dillon, Montana
  2. 1.5 32 km SW of Lima, Montana
  3. 2.1 26 km SSW of Lima, Montana
  4. 2.3 33 km WNW of Lima, Montana
  5. 2.4 22 km NE of Lima, Montana
  6. 1.6 30 km NE of Lima, Montana
  7. 1.5 30 km NE of Lima, Montana
  8. 3.5 27 km NE of Lima, Montana
  9. 1.8 19 km W of Lima, Montana
  10. 1.7 22 km NE of Lima, Montana
  11. 2.1 9 km SSE of Lima, Montana
  12. 2.2 24 km NNE of Lima, Montana
  13. 2.2 5 km NNE of Lima, Montana
  14. 2.3 32 km S 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.