QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6ml

23 km SE of Happys Inn, Montana

· 5.4 km deep · released about 280 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sanders County 29 kmLake County 70 kmFlathead County 75 kmLincoln County 80 kmMineral County 91 kmShoshone County 98 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
5.4 km below the surface
Felt
no reports yet
Nearest
Sanders County, 29 km SW
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.

How big was it?

This earthquake released about 280 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 55,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 39,000× the energy of this one
  3. Around the size people start to feel M 3.0 3.5× the energy of this one
  4. This earthquake M 2.6 about 280 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 47.9400, -114.9088. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sanders County, MT 29 km (18 mi) NE of here earthquakes near Sanders County
Lake County, MT 70 km (43 mi) WNW of here earthquakes near Lake County
Flathead County, MT 75 km (47 mi) WSW of here earthquakes near Flathead County
Lincoln County, MT 80 km (49 mi) SSE of here earthquakes near Lincoln County
Mineral County, MT 91 km (57 mi) N of here earthquakes near Mineral County
Shoshone County, ID 98 km (61 mi) NE of here earthquakes near Shoshone County

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

Aftershocks so far

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

  1. 1.7 19 km SW of Marion, Montana
  2. 2.3 18 km SW of Marion, Montana
  3. 2.0 19 km SW of Marion, Montana
  4. 2.2 7 km WNW of Lake Mary Ronan, Montana
  5. 1.7 7 km WNW of Lake Mary Ronan, Montana
  6. 1.8 6 km WNW of Lake Mary Ronan, Montana
  7. 1.7 21 km SSE of Happys Inn, Montana
  8. 2.0 17 km W of Niarada, Montana
  9. 1.8 3 km NW of Happys Inn, Montana
  10. 1.6 4 km NW of Niarada, Montana
  11. 2.6 4 km NW of Happys Inn, Montana
  12. 1.8 17 km WNW of Niarada, Montana
  13. 1.8 6 km NNW of Plains, Montana
  14. 1.7 11 km NW of Batavia, Montana
  15. 2.2 16 km ENE of Happys Inn, 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.