QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

southern Idaho

· 6.4 km deep · released about 41 lb of TNT

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10 km30 km60 km120 km N Custer County 31 kmLemhi County 78 kmValley County 95 kmBoise County 103 kmCamas County 105 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
6.4 km below the surface
Felt
no reports yet
Nearest
Custer County, 31 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3043 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 41 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 5.8 370,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 260,000× the energy of this one
  3. Around the size people start to feel M 3.0 23× the energy of this one
  4. This earthquake M 2.1 about 41 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 44.4322, -114.5787. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Custer County, ID 31 km (20 mi) NW of here earthquakes near Custer County
Lemhi County, ID 78 km (48 mi) SW of here earthquakes near Lemhi County
Valley County, ID 95 km (59 mi) ESE of here earthquakes near Valley County
Boise County, ID 103 km (64 mi) ENE of here earthquakes near Boise County
Camas County, ID 105 km (65 mi) N of here earthquakes near Camas County
Blaine County, ID 126 km (78 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

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

  1. 1.7 2 km N of Challis, Idaho
  2. 2.2 6 km N of Stanley, Idaho
  3. 2.1 9 km NNW of Stanley, Idaho
  4. 1.7 6 km N of Stanley, Idaho
  5. 1.6 5 km N of Stanley, Idaho
  6. 1.6 33 km W of Challis, Idaho
  7. 2.4 9 km N of Stanley, Idaho
  8. 1.6 8 km N of Stanley, Idaho
  9. 1.6 16 km SE of Challis, Idaho
  10. 1.6 9 km N of Stanley, Idaho
  11. 1.6 7 km NNW of Stanley, Idaho
  12. 1.6 7 km NNW of Stanley, Idaho
  13. 2.5 12 km NNE of Stanley, Idaho
  14. 1.6 southern Idaho
  15. 1.8 9 km N 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.