QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3ml

41 km NE of Leadore, Idaho

· 12 km deep · released about 1.3 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Beaverhead County 21 kmLemhi County 65 kmClark County 96 kmMadison County 98 kmSilver Bow County 106 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
12 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
Beaverhead County, 21 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1694 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 1.3 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 44.9879, -113.0683. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Beaverhead County, MT 21 km (13 mi) SW of here earthquakes near Beaverhead County
Lemhi County, ID 65 km (40 mi) E of here earthquakes near Lemhi County
Clark County, ID 96 km (60 mi) NW of here earthquakes near Clark County
Madison County, MT 98 km (61 mi) WSW of here earthquakes near Madison County
Silver Bow County, MT 106 km (66 mi) SSW of here earthquakes near Silver Bow County
Custer County, ID 123 km (76 mi) NE of here earthquakes near Custer County

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

Aftershocks so far

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

  1. 1.7 14 km NW of Lima, Montana
  2. 1.9 23 km SSE of Dillon, Montana
  3. 2.0 28 km WSW of Dillon, Montana
  4. 1.6 26 km NW of Lima, Montana
  5. 2.0 30 km W of Lima, Montana
  6. 2.0 33 km NNW of Lima, Montana
  7. 1.6 22 km WSW of Lima, Montana
  8. 2.4 21 km WSW of Lima, Montana
  9. 2.0 40 km SW of Dillon, Montana
  10. 1.8 39 km SW of Dillon, Montana
  11. 1.9 39 km SW of Dillon, Montana
  12. 1.6 39 km SW of Dillon, Montana
  13. 2.4 41 km SW of Dillon, Montana
  14. 2.4 40 km NNE of Leadore, Idaho
  15. 2.6 41 km NE of Leadore, 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.

On USGS

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