QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2ml

43 km WSW of Salmon, Idaho

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

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lemhi County 42 kmCuster County 85 kmValley County 98 kmRavalli County 119 kmBeaverhead County 119 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
10 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Lemhi County, 42 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1511 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 45.0286, -114.4034. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lemhi County, ID 42 km (26 mi) WNW of here earthquakes near Lemhi County
Custer County, ID 85 km (53 mi) N of here earthquakes near Custer County
Valley County, ID 98 km (61 mi) ENE of here earthquakes near Valley County
Ravalli County, MT 119 km (74 mi) SSW of here earthquakes near Ravalli County
Beaverhead County, MT 119 km (74 mi) W of here earthquakes near Beaverhead County
Idaho County, ID 123 km (77 mi) SE of here earthquakes near Idaho County

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

Aftershocks so far

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

  1. 1.5 19 km NNW of Challis, Idaho
  2. 1.8 32 km NW of Challis, Idaho
  3. 1.7 33 km NW of Challis, Idaho
  4. 1.6 51 km WSW of Salmon, Idaho
  5. 1.9 18 km S of Salmon, Idaho
  6. 1.8 18 km NNE of Challis, Idaho
  7. 1.8 45 km WSW of Salmon, Idaho
  8. 2.6 46 km WSW of Salmon, Idaho
  9. 1.6 27 km NW of Challis, Idaho
  10. 1.5 48 km WSW of Salmon, Idaho
  11. 2.3 22 km NNE of Challis, Idaho
  12. 1.8 22 km NNE of Challis, Idaho
  13. 2.4 12 km NW of Challis, Idaho
  14. 1.9 23 km NNE of Challis, Idaho
  15. 1.6 55 km E of Yellow Pine, 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

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