QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

36 km SW of Lima, Montana

· 4.7 km deep · released about 1,300 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 46 kmBeaverhead County 82 kmButte County 82 kmJefferson County 82 kmLemhi County 97 kmCuster County 107 kmFremont 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 3.1 (ml)
Depth
4.7 km below the surface
Felt
no reports yet
Nearest
Clark County, 46 km ESE
Nearest mapped fault
Beaverhead fault, 8 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3819 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 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× 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 44.4004, -112.9167. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, ID 46 km (29 mi) WNW of here earthquakes near Clark County
Beaverhead County, MT 82 km (51 mi) S of here earthquakes near Beaverhead County
Butte County, ID 82 km (51 mi) NNE of here earthquakes near Butte County
Jefferson County, ID 82 km (51 mi) NW of here earthquakes near Jefferson County
Lemhi County, ID 97 km (60 mi) SE of here earthquakes near Lemhi County
Custer County, ID 107 km (67 mi) E of here earthquakes near Custer 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. 1.7 Idaho-Montana border region
  2. 1.6 32 km ENE of Leadore, Idaho
  3. 1.6 10 km NE of Lima, Montana
  4. 2.4 10 km NE of Lima, Montana
  5. 2.3 10 km NE of Lima, Montana
  6. 3.0 10 km NE of Lima, Montana
  7. 2.2 10 km NE of Lima, Montana
  8. 2.4 2 km E of Lima, Montana
  9. 2.3 10 km NE of Lima, Montana
  10. 2.0 11 km NE of Lima, Montana
  11. 1.9 9 km ENE of Lima, Montana
  12. 2.0 11 km NE of Lima, Montana
  13. 2.3 11 km NE of Lima, Montana
  14. 2.2 10 km NE of Lima, Montana
  15. 2.4 10 km NE 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.