QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2ml

16 km ENE of Happys Inn, Montana

· 16 km deep · released about 60 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sanders County 47 kmLincoln County 59 kmFlathead County 68 kmLake County 86 kmShoshone County 114 kmMineral County 114 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 2.2 (ml)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Sanders County, 47 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1336 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 60 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 250,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 180,000× the energy of this one
  3. Around the size people start to feel M 3.0 16× the energy of this one
  4. This earthquake M 2.2 about 60 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 48.1529, -114.9466. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sanders County, MT 47 km (29 mi) NNE of here earthquakes near Sanders County
Lincoln County, MT 59 km (36 mi) SE of here earthquakes near Lincoln County
Flathead County, MT 68 km (42 mi) WSW of here earthquakes near Flathead County
Lake County, MT 86 km (53 mi) NW of here earthquakes near Lake County
Shoshone County, ID 114 km (71 mi) NE of here earthquakes near Shoshone County
Mineral County, MT 114 km (71 mi) N of here earthquakes near Mineral County

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

Aftershocks so far

14 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. 2.4 23 km ENE of Noxon, Montana
  9. 2.0 17 km W of Niarada, Montana
  10. 1.8 3 km NW of Happys Inn, Montana
  11. 1.6 4 km NW of Niarada, Montana
  12. 2.6 4 km NW of Happys Inn, Montana
  13. 1.8 17 km WNW of Niarada, Montana
  14. 1.7 11 km NW of Batavia, 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.