QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2ml

22 km NW of Challis, Idaho

· 17 km deep · released about 1,900 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Custer County 45 kmLemhi County 51 kmValley County 98 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 3.2 (ml)
Depth
17 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Custer County, 45 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1045 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,900 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 180,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 7,900× the energy of this one
  3. Magna, Utah 2020 M 5.7 5,600× the energy of this one
  4. This earthquake M 3.2 about 1,900 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 2× 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 44.6605, -114.4085. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Custer County, ID 45 km (28 mi) NNW of here earthquakes near Custer County
Lemhi County, ID 51 km (32 mi) SW of here earthquakes near Lemhi County
Valley County, ID 98 km (61 mi) ESE of here earthquakes near Valley County
Boise County, ID 128 km (80 mi) NE of here earthquakes near Boise County
Butte County, ID 146 km (91 mi) NW of here earthquakes near Butte County

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

Aftershocks so far

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

  1. 2.4 45 km NNE of Stanley, Idaho
  2. 1.7 24 km SE of Challis, Idaho
  3. 1.9 43 km NNE of Stanley, Idaho
  4. 2.1 43 km NNE of Stanley, Idaho
  5. 2.0 43 km NNE of Stanley, Idaho
  6. 1.8 33 km NNW of Challis, Idaho
  7. 1.7 32 km NNW of Challis, Idaho
  8. 1.8 43 km NNE of Stanley, Idaho
  9. 2.0 44 km NNE of Stanley, Idaho
  10. 2.1 43 km NNE of Stanley, Idaho
  11. 2.7 32 km NNW of Challis, Idaho
  12. 1.6 20 km NNW of Challis, Idaho
  13. 1.8 20 km NW of Challis, Idaho
  14. 1.5 8 km ESE of Challis, Idaho
  15. 1.6 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.