QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

30 km N of Sun Valley, Idaho

· 7.6 km deep · released about 51 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Custer County 34 kmCamas County 62 kmBlaine County 72 kmButte County 99 kmBoise County 109 kmLincoln County 110 kmElmore County 111 kmLemhi County 113 kmGooding 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 2.1 (ml)
Depth
7.6 km below the surface
Felt
no reports yet
Nearest
Custer County, 34 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1589 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 51 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 5.8 300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 210,000× 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 51 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 43.9727, -114.3518. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Custer County, ID 34 km (21 mi) SSW of here earthquakes near Custer County
Camas County, ID 62 km (39 mi) NNE of here earthquakes near Camas County
Blaine County, ID 72 km (45 mi) NNW of here earthquakes near Blaine County
Butte County, ID 99 km (62 mi) WNW of here earthquakes near Butte County
Boise County, ID 109 km (68 mi) E of here earthquakes near Boise County
Lincoln County, ID 110 km (69 mi) N of here earthquakes near Lincoln County

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

Aftershocks so far

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

  1. 2.3 11 km ENE of Stanley, Idaho
  2. 1.5 5 km S of Clayton, Idaho
  3. 2.8 12 km ENE of Stanley, Idaho
  4. 2.8 22 km WNW of Clayton, Idaho
  5. 1.7 southern Idaho
  6. 2.1 17 km ENE of Stanley, Idaho
  7. 1.7 southern Idaho
  8. 1.7 28 km E of Clayton, Idaho
  9. 1.5 Idaho-Montana border region
  10. 1.8 29 km S of Clayton, Idaho
  11. 2.4 19 km SE of Challis, Idaho
  12. 1.7 11 km ENE of Stanley, Idaho
  13. 1.8 17 km SSE of Clayton, Idaho
  14. 2.2 16 km ENE of Clayton, Idaho
  15. 1.6 18 km ENE of Clayton, 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.