QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

26 km SSW of Lima, Montana

· 8.2 km deep · released about 44 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 28 kmJefferson County 73 kmBeaverhead County 83 kmButte County 89 kmFremont County 97 kmMadison County 106 kmLemhi County 112 kmMadison 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 2.1 (ml)
Depth
8.2 km below the surface
Felt
no reports yet
Nearest
Clark County, 28 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2942 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 44 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 340,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 240,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 44 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 44.4020, -112.6760. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, ID 28 km (18 mi) WNW of here earthquakes near Clark County
Jefferson County, ID 73 km (45 mi) NNW of here earthquakes near Jefferson County
Beaverhead County, MT 83 km (52 mi) SSE of here earthquakes near Beaverhead County
Butte County, ID 89 km (55 mi) NNE of here earthquakes near Butte County
Fremont County, ID 97 km (60 mi) WNW of here earthquakes near Fremont County
Madison County, ID 106 km (66 mi) NW of here earthquakes near Madison County

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

Aftershocks so far

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

  1. 1.7 8 km E of Lima, Montana
  2. 1.6 7 km E of Lima, Montana
  3. 1.6 8 km E of Lima, Montana
  4. 1.9 7 km E of Lima, Montana
  5. 3.3 8 km ESE of Lima, Montana
  6. 2.3 6 km NNE of Lima, Montana
  7. 1.9 6 km E of Lima, Montana
  8. 1.8 20 km NW of Lima, Montana
  9. 1.6 27 km SW of Lima, Montana
  10. 1.8 55 km SW of Lima, Montana
  11. 1.8 29 km ENE of Leadore, Idaho
  12. 1.5 24 km WSW of Lima, Montana
  13. 2.3 29 km SW of Lima, Montana
  14. 1.6 47 km NE of Mackay, Idaho
  15. 2.3 27 km E of Leadore, Idaho

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.