QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

6 km ENE of Lima, Montana

· 11 km deep · released about 680 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 42 kmBeaverhead County 61 kmMadison County 88 kmFremont County 95 kmJefferson County 97 kmLemhi County 113 kmMadison County 118 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 2.9 (ml)
Depth
11 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Clark County, 42 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1354 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 680 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 22,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 16,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.4× the energy of this one
  4. This earthquake M 2.9 about 680 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 44.6548, -112.5143. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, ID 42 km (26 mi) NNW of here earthquakes near Clark County
Beaverhead County, MT 61 km (38 mi) SSE of here earthquakes near Beaverhead County
Madison County, MT 88 km (55 mi) SSW of here earthquakes near Madison County
Fremont County, ID 95 km (59 mi) WNW of here earthquakes near Fremont County
Jefferson County, ID 97 km (60 mi) N of here earthquakes near Jefferson County
Lemhi County, ID 113 km (70 mi) ESE of here earthquakes near Lemhi County

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

Aftershocks so far

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

  1. 1.8 3 km SSE of Lima, Montana
  2. 1.5 3 km SE of Lima, Montana
  3. 2.6 6 km E of Lima, Montana
  4. 2.4 Idaho-Montana border region
  5. 1.8 Idaho-Montana border region
  6. 2.6 8 km ESE of Lima, Montana
  7. 2.0 35 km S of Lima, Montana
  8. 2.4 1 km WSW of Lima, Montana
  9. 2.2 8 km E of Lima, Montana
  10. 1.6 3 km SSE of Lima, Montana
  11. 1.7 3 km SSE of Lima, Montana
  12. 2.1 3 km SSE of Lima, Montana
  13. 2.3 3 km SSE of Lima, Montana
  14. 1.6 3 km SSE of Lima, Montana
  15. 1.9 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 350 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.