QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

47 km WSW of Salmon, Idaho

· 19 km deep · released about 480 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lemhi County 46 kmCuster County 84 kmValley County 93 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
19 km below the surface
Felt
no reports yet
Nearest
Lemhi County, 46 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2206 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 45.0117, -114.4597. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lemhi County, ID 46 km (29 mi) WNW of here earthquakes near Lemhi County
Custer County, ID 84 km (52 mi) N of here earthquakes near Custer County
Valley County, ID 93 km (58 mi) E of here earthquakes near Valley County
Ravalli County, MT 122 km (76 mi) SSW of here earthquakes near Ravalli County
Idaho County, ID 122 km (76 mi) SE of here earthquakes near Idaho County
Boise County, ID 151 km (94 mi) NE of here earthquakes near Boise County

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

Aftershocks so far

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

  1. 2.6 southern Idaho
  2. 2.0 33 km NNW of Challis, Idaho
  3. 2.2 southern Idaho
  4. 2.1 28 km WNW of Challis, Idaho
  5. 2.3 32 km NNW of Challis, Idaho
  6. 2.3 32 km NNW of Challis, Idaho
  7. 2.5 33 km NNW of Challis, Idaho
  8. 2.5 33 km NNW of Challis, Idaho
  9. 2.0 southern Idaho
  10. 2.3 29 km WNW of Challis, Idaho
  11. 1.8 32 km NNW of Challis, Idaho
  12. 2.0 34 km NNW of Challis, Idaho
  13. 1.6 18 km NW of Challis, Idaho
  14. 2.2 24 km NW of Challis, Idaho
  15. 1.6 28 km WNW 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.