QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

25 km NNW of Salmon, Idaho

· 16 km deep · released about 480 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lemhi County 52 kmRavalli County 78 kmBeaverhead County 96 kmDeer Lodge County 107 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
16 km below the surface
Felt
3 reports · strongest reported intensity II
Nearest
Lemhi County, 52 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 943 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 3 people have reported feeling it to USGS.

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 45.3776, -114.0632. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lemhi County, ID 52 km (32 mi) NNW of here earthquakes near Lemhi County
Ravalli County, MT 78 km (48 mi) S of here earthquakes near Ravalli County
Beaverhead County, MT 96 km (59 mi) WNW of here earthquakes near Beaverhead County
Deer Lodge County, MT 107 km (67 mi) SW of here earthquakes near Deer Lodge County
Idaho County, ID 121 km (75 mi) ESE of here earthquakes near Idaho County
Silver Bow County, MT 123 km (77 mi) WSW of here earthquakes near Silver Bow County

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

Aftershocks so far

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

  1. 2.7 10 km WNW of Wisdom, Montana
  2. 2.4 7 km W of Wisdom, Montana
  3. 1.9 8 km WNW of Wisdom, Montana
  4. 3.4 12 km WNW of Wisdom, Montana
  5. 1.7 32 km WSW of Salmon, Idaho
  6. 1.5 32 km WSW of Salmon, Idaho
  7. 2.0 10 km WNW of Wisdom, Montana
  8. 1.6 12 km WNW of Wisdom, Montana
  9. 1.8 12 km WNW of Wisdom, Montana
  10. 1.5 6 km ESE of Salmon, Idaho
  11. 1.6 4 km NNE of Salmon, Idaho
  12. 1.7 12 km WNW of Wisdom, Montana

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.