QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

10 km NNW of Challis, Idaho

· 5.0 km deep · released about 340 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Custer County 36 kmLemhi County 49 kmValley County 110 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 2.7 (ml)
Depth
5.0 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Custer County, 36 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 886 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 44.5930, -114.2805. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Custer County, ID 36 km (22 mi) N of here earthquakes near Custer County
Lemhi County, ID 49 km (30 mi) SW of here earthquakes near Lemhi County
Valley County, ID 110 km (68 mi) ESE of here earthquakes near Valley County
Beaverhead County, MT 125 km (78 mi) WSW of here earthquakes near Beaverhead County
Boise County, ID 133 km (82 mi) ENE of here earthquakes near Boise County
Butte County, ID 134 km (83 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

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

  1. 2.3 21 km NNW of Challis, Idaho
  2. 1.5 18 km NW of Challis, Idaho
  3. 2.0 26 km W of Challis, Idaho
  4. 2.1 26 km W of Challis, Idaho
  5. 1.6 32 km NNW of Challis, Idaho
  6. 2.0 4 km N of Clayton, Idaho
  7. 1.9 11 km SE of Challis, Idaho
  8. 1.6 19 km NW of Challis, Idaho
  9. 1.9 20 km NNW of Challis, Idaho
  10. 2.0 23 km NNW of Challis, Idaho
  11. 2.0 32 km NNW of Challis, Idaho
  12. 1.8 19 km NNW of Clayton, Idaho
  13. 2.0 24 km SE of Challis, Idaho
  14. 2.5 21 km NNE of Challis, Idaho
  15. 1.5 11 km WSW 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.