QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

47 km ENE of Lima, Montana

· 7.3 km deep · released about 41 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madison County 59 kmClark County 62 kmBeaverhead County 77 kmFremont County 78 kmGallatin County 105 kmJefferson County 114 kmMadison 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 2.1 (ml)
Depth
7.3 km below the surface
Felt
no reports yet
Nearest
Madison County, 59 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1643 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 41 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 5.8 370,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 260,000× the energy of this one
  3. Around the size people start to feel M 3.0 23× the energy of this one
  4. This earthquake M 2.1 about 41 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 44.7997, -112.0320. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madison County, MT 59 km (37 mi) S of here earthquakes near Madison County
Clark County, ID 62 km (39 mi) NNE of here earthquakes near Clark County
Beaverhead County, MT 77 km (48 mi) ESE of here earthquakes near Beaverhead County
Fremont County, ID 78 km (48 mi) NNW of here earthquakes near Fremont County
Gallatin County, MT 105 km (65 mi) SW of here earthquakes near Gallatin County
Jefferson County, ID 114 km (71 mi) NNE of here earthquakes near Jefferson County

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

Aftershocks so far

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

  1. 2.0 3 km SSE of Lima, Montana
  2. 2.0 3 km SSE of Lima, Montana
  3. 1.8 3 km SSE of Lima, Montana
  4. 1.5 Idaho-Montana border region
  5. 1.5 3 km SE of Lima, Montana
  6. 2.6 6 km E of Lima, Montana
  7. 2.4 Idaho-Montana border region
  8. 1.8 53 km NNE of Spencer, Idaho
  9. 2.6 8 km ESE of Lima, Montana
  10. 1.7 36 km NE of Spencer, Idaho
  11. 1.9 37 km SW of Big Sky, Montana
  12. 2.2 8 km E of Lima, Montana
  13. 2.5 46 km NW of Island Park, Idaho
  14. 1.6 3 km SSE of Lima, Montana
  15. 1.7 3 km SSE 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.6 on 2019-04-09 — it released about 5,800 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.