QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

9 km NW of Clayton, Idaho

· 6.3 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Custer County 19 kmLemhi County 81 kmCamas County 95 kmBoise County 106 kmValley County 108 kmBlaine County 112 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 1.8 (ml)
Depth
6.3 km below the surface
Felt
no reports yet
Nearest
Custer County, 19 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 341 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 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 44.3308, -114.4723. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Custer County, ID 19 km (12 mi) WNW of here earthquakes near Custer County
Lemhi County, ID 81 km (50 mi) SW of here earthquakes near Lemhi County
Camas County, ID 95 km (59 mi) NNE of here earthquakes near Camas County
Boise County, ID 106 km (66 mi) ENE of here earthquakes near Boise County
Valley County, ID 108 km (67 mi) ESE of here earthquakes near Valley County
Blaine County, ID 112 km (70 mi) NNW of here earthquakes near Blaine County

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

Aftershocks so far

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

  1. 2.9 4 km NNE of Stanley, Idaho
  2. 1.7 25 km SSE of Challis, Idaho
  3. 2.0 8 km SSW of Challis, Idaho
  4. 2.3 7 km E of Challis, Idaho
  5. 2.7 8 km N of Stanley, Idaho
  6. 2.6 4 km NW of Challis, Idaho
  7. 2.4 2 km NW of Challis, Idaho
  8. 2.6 26 km S of Clayton, Idaho
  9. 1.7 14 km NNE of Challis, Idaho
  10. 2.1 21 km ESE of Stanley, Idaho
  11. 2.4 29 km S of Clayton, Idaho
  12. 1.8 3 km NNW of Stanley, Idaho
  13. 2.3 19 km NNE of Challis, Idaho
  14. 2.1 14 km W of Clayton, Idaho
  15. 2.6 15 km NNW of Stanley, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.3 on 2025-06-08 — it released about 6,200 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.