QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

25 km SSW of Clayton, Idaho

· 5.3 km deep · released about 49 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Custer County 33 kmCamas County 63 kmBlaine County 83 kmBoise County 98 kmElmore County 106 kmLemhi County 110 kmButte County 112 kmLincoln County 119 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 2.1 (ml)
Depth
5.3 km below the surface
Felt
no reports yet
Nearest
Custer County, 33 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2870 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 49 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 310,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 220,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 49 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 44.0352, -114.4913. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Custer County, ID 33 km (20 mi) SW of here earthquakes near Custer County
Camas County, ID 63 km (39 mi) NNE of here earthquakes near Camas County
Blaine County, ID 83 km (52 mi) NNW of here earthquakes near Blaine County
Boise County, ID 98 km (61 mi) E of here earthquakes near Boise County
Elmore County, ID 106 km (66 mi) NE of here earthquakes near Elmore County
Lemhi County, ID 110 km (69 mi) SSW of here earthquakes near Lemhi County

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

Aftershocks so far

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

  1. 2.4 7 km NW of Stanley, Idaho
  2. 2.4 7 km NW of Stanley, Idaho
  3. 2.1 5 km N of Stanley, Idaho
  4. 2.3 12 km N of Stanley, Idaho
  5. 2.0 7 km SW of Challis, Idaho
  6. 1.5 Idaho-Montana border region
  7. 1.6 22 km NNW of Clayton, Idaho
  8. 2.5 20 km SSW of Clayton, Idaho
  9. 2.9 30 km WNW of Mackay, Idaho
  10. 2.8 32 km E of Clayton, Idaho
  11. 2.2 30 km E of Clayton, Idaho
  12. 1.6 35 km ESE of Clayton, Idaho
  13. 1.9 13 km SE of Stanley, Idaho
  14. 2.1 14 km SE of Stanley, Idaho
  15. 1.7 southern 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.