QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6ml

25 km SW of Alberton, Montana

· 3.7 km deep · released about 240 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mineral County 45 kmMissoula County 65 kmClearwater County 75 kmRavalli County 95 kmLake County 102 kmShoshone County 107 kmGranite County 108 kmSanders County 109 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 2.6 (ml)
Depth
3.7 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
Mineral County, 45 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1962 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 240 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 63,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 45,000× the energy of this one
  3. Around the size people start to feel M 3.0 4× the energy of this one
  4. This earthquake M 2.6 about 240 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 46.8278, -114.6982. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mineral County, MT 45 km (28 mi) SE of here earthquakes near Mineral County
Missoula County, MT 65 km (40 mi) WSW of here earthquakes near Missoula County
Clearwater County, ID 75 km (46 mi) ENE of here earthquakes near Clearwater County
Ravalli County, MT 95 km (59 mi) NNW of here earthquakes near Ravalli County
Lake County, MT 102 km (63 mi) SSW of here earthquakes near Lake County
Shoshone County, ID 107 km (66 mi) ESE of here earthquakes near Shoshone County

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

Aftershocks so far

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

  1. 1.9 2 km NNE of Alberton, Montana
  2. 1.5 6 km S of Frenchtown, Montana
  3. 1.7 6 km S of Frenchtown, Montana
  4. 1.9 6 km S of Huson, Montana
  5. 1.9 3 km SSW of Alberton, Montana
  6. 1.7 2 km ENE of Alberton, Montana
  7. 2.2 2 km NE of Alberton, Montana
  8. 1.7 4 km WNW of Wye, Montana
  9. 1.7 4 km SSW of Alberton, Montana
  10. 2.1 3 km S of Alberton, Montana
  11. 2.2 1 km SE of Alberton, Montana
  12. 2.2 36 km W of Pinesdale, Montana
  13. 1.8 1 km SE of Alberton, Montana
  14. 1.9 18 km WSW of Alberton, Montana
  15. 1.6 4 km WNW of Wye, 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.