QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

9 km SSE of Lima, Montana

· 8.2 km deep · released about 51 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 34 kmBeaverhead County 70 kmJefferson County 86 kmFremont County 93 kmMadison County 100 kmButte County 109 kmMadison County 112 kmLemhi County 113 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, 34 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3181 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 51 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 5.8 300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 210,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 51 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 44.5547, -112.5598. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, ID 34 km (21 mi) NNW of here earthquakes near Clark County
Beaverhead County, MT 70 km (43 mi) SSE of here earthquakes near Beaverhead County
Jefferson County, ID 86 km (54 mi) NNW of here earthquakes near Jefferson County
Fremont County, ID 93 km (58 mi) WNW of here earthquakes near Fremont County
Madison County, MT 100 km (62 mi) SSW of here earthquakes near Madison County
Butte County, ID 109 km (67 mi) NNE of here earthquakes near Butte County

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

Aftershocks so far

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

  1. 1.6 23 km NW of Lima, Montana
  2. 1.5 29 km NE of Lima, Montana
  3. 1.6 16 km WSW of Lima, Montana
  4. 2.1 8 km E of Lima, Montana
  5. 1.6 29 km NNE of Spencer, Idaho
  6. 1.8 18 km S of Lima, Montana
  7. 1.9 26 km NNW of Lima, Montana
  8. 1.6 26 km SSW of Lima, Montana
  9. 2.2 10 km NE of Lima, Montana
  10. 2.2 26 km ENE of Leadore, Idaho
  11. 2.4 33 km NNE of Spencer, Idaho
  12. 2.4 32 km ENE of Leadore, Idaho
  13. 2.2 5 km ENE of Lima, Montana
  14. 2.4 10 km NE of Lima, Montana
  15. 2.8 11 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.