QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

32 km S of Lima, Montana

· 10 km deep · released about 1,300 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 23 kmJefferson County 66 kmButte County 85 kmBeaverhead County 90 kmFremont County 93 kmMadison County 100 kmLemhi 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 3.1 (ml)
Depth
10 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Clark County, 23 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1687 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× more

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 44.3442, -112.6355. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, ID 23 km (14 mi) WNW of here earthquakes near Clark County
Jefferson County, ID 66 km (41 mi) NNW of here earthquakes near Jefferson County
Butte County, ID 85 km (53 mi) NNE of here earthquakes near Butte County
Beaverhead County, MT 90 km (56 mi) SSE of here earthquakes near Beaverhead County
Fremont County, ID 93 km (58 mi) W of here earthquakes near Fremont County
Madison County, ID 100 km (62 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

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

  1. 1.6 4 km SSE of Lima, Montana
  2. 2.2 2 km SSE of Lima, Montana
  3. 1.8 1 km SSE of Lima, Montana
  4. 1.5 2 km S of Lima, Montana
  5. 1.8 2 km S of Lima, Montana
  6. 3.5 0 km WSW of Lima, Montana
  7. 1.6 3 km S of Lima, Montana
  8. 1.6 2 km SSE of Lima, Montana
  9. 1.7 2 km SSE of Lima, Montana
  10. 1.7 12 km NNE of Lima, Montana
  11. 2.2 Idaho-Montana border region
  12. 1.6 7 km SSE of Lima, Montana
  13. 2.1 2 km S of Lima, Montana
  14. 1.6 2 km S of Lima, Montana
  15. 1.6 1 km S 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 180 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.