QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

17 km NW of Lima, Montana

· 2.9 km deep · released about 85 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Beaverhead County 45 kmClark County 59 kmLemhi County 92 kmMadison County 93 kmJefferson County 110 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 2.3 (ml)
Depth
2.9 km below the surface
Felt
no reports yet
Nearest
Beaverhead County, 45 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 759 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 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 11× the energy of this one
  4. This earthquake M 2.3 about 85 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 44.7383, -112.7535. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Beaverhead County, MT 45 km (28 mi) SSE of here earthquakes near Beaverhead County
Clark County, ID 59 km (37 mi) NNW of here earthquakes near Clark County
Lemhi County, ID 92 km (57 mi) ESE of here earthquakes near Lemhi County
Madison County, MT 93 km (58 mi) SW of here earthquakes near Madison County
Jefferson County, ID 110 km (69 mi) NNW of here earthquakes near Jefferson County
Fremont County, ID 116 km (72 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

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

  1. 1.8 24 km N of Spencer, Idaho
  2. 2.3 25 km N of Spencer, Idaho
  3. 2.5 22 km N of Spencer, Idaho
  4. 1.9 23 km N of Spencer, Idaho
  5. 3.0 27 km N of Spencer, Idaho
  6. 1.8 24 km N of Spencer, Idaho
  7. 2.0 24 km N of Spencer, Idaho
  8. 1.8 27 km SW of Dillon, Montana
  9. 1.6 19 km NW of Lima, Montana
  10. 1.5 24 km N of Spencer, Idaho
  11. 2.0 23 km N of Spencer, Idaho
  12. 1.9 23 km N of Spencer, Idaho
  13. 2.5 22 km N of Spencer, Idaho
  14. 2.5 24 km N of Spencer, Idaho
  15. 1.9 23 km N of Spencer, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.6 on 2019-04-09 — it released about 2,800 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.