QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3ml

8 km ESE of Lima, Montana

· 8.9 km deep · released about 1.3 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 38 kmBeaverhead County 65 kmMadison County 91 kmFremont County 92 kmJefferson County 92 kmMadison County 114 kmLemhi County 115 kmButte County 117 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 3.3 (ml)
Depth
8.9 km below the surface
Felt
2 reports · strongest reported intensity II
Measured shaking
intensity III (ShakeMap)
Nearest
Clark County, 38 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2045 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 1.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 130,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 5,600× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,000× the energy of this one
  4. This earthquake M 3.3 about 1.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.8× 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 44.6178, -112.4934. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, ID 38 km (24 mi) NNW of here earthquakes near Clark County
Beaverhead County, MT 65 km (41 mi) SSE of here earthquakes near Beaverhead County
Madison County, MT 91 km (56 mi) SSW of here earthquakes near Madison County
Fremont County, ID 92 km (57 mi) WNW of here earthquakes near Fremont County
Jefferson County, ID 92 km (57 mi) N of here earthquakes near Jefferson County
Madison County, ID 114 km (71 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

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

  1. 1.8 33 km NNW of Lima, Montana
  2. 2.0 33 km SSW of Dillon, Montana
  3. 3.1 32 km S of Lima, Montana
  4. 1.5 17 km SSW of Lima, Montana
  5. 1.7 29 km SSW of Dillon, Montana
  6. 2.4 25 km N of Spencer, Idaho
  7. 1.5 38 km SSW of Virginia City, Montana
  8. 2.2 35 km NNE of Spencer, Idaho
  9. 1.5 37 km SSW of Dillon, Montana
  10. 2.5 21 km SW of Lima, Montana
  11. 2.0 36 km NNE of Spencer, Idaho
  12. 1.6 3 km ENE of Lima, Montana
  13. 2.6 16 km NE of Lima, Montana
  14. 1.8 46 km NNE of Spencer, Idaho
  15. 1.7 6 km E 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 89 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.