QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

32 km E of Clayton, Idaho

· 17 km deep · released about 480 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Custer County 21 kmLemhi County 80 kmButte County 88 kmBlaine County 91 kmCamas County 100 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 2.8 (ml)
Depth
17 km below the surface
Felt
no reports yet
Nearest
Custer County, 21 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2371 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 2× the energy of this one
  4. This earthquake M 2.8 about 480 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 44.2122, -114.0000. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Custer County, ID 21 km (13 mi) ESE of here earthquakes near Custer County
Lemhi County, ID 80 km (50 mi) S of here earthquakes near Lemhi County
Butte County, ID 88 km (55 mi) NW of here earthquakes near Butte County
Blaine County, ID 91 km (57 mi) N of here earthquakes near Blaine County
Camas County, ID 100 km (62 mi) NE of here earthquakes near Camas County
Beaverhead County, MT 135 km (84 mi) SW of here earthquakes near Beaverhead County

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

Aftershocks so far

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

  1. 2.4 26 km ESE of Challis, Idaho
  2. 2.1 16 km SSW of Clayton, Idaho
  3. 1.6 19 km W of Challis, Idaho
  4. 2.3 23 km E of Challis, Idaho
  5. 1.9 22 km NNE of Sun Valley, Idaho
  6. 2.2 33 km NW of Mackay, Idaho
  7. 1.7 24 km ESE of Clayton, Idaho
  8. 2.3 16 km SSE of Clayton, Idaho
  9. 2.7 13 km SSE of Clayton, Idaho
  10. 1.5 12 km SW of Clayton, Idaho
  11. 1.7 21 km E of Clayton, Idaho
  12. 1.7 16 km SSW of Clayton, Idaho
  13. 2.4 15 km NE of Challis, Idaho
  14. 1.6 23 km E of Clayton, Idaho
  15. 2.4 12 km NW of Challis, 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.