QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2ml

Idaho-Montana border region

· 8.9 km deep · released about 69 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Missoula County 46 kmGranite County 57 kmRavalli County 62 kmPowell County 91 kmDeer Lodge County 94 kmMineral County 94 kmLake County 112 kmClearwater County 120 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
8.9 km below the surface
Felt
no reports yet
Nearest
Missoula County, 46 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1245 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 69 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 5.8 220,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 150,000× the energy of this one
  3. Around the size people start to feel M 3.0 14× the energy of this one
  4. This earthquake M 2.2 about 69 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 46.6332, -114.0843. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Missoula County, MT 46 km (29 mi) SSW of here earthquakes near Missoula County
Granite County, MT 57 km (35 mi) WNW of here earthquakes near Granite County
Ravalli County, MT 62 km (38 mi) N of here earthquakes near Ravalli County
Powell County, MT 91 km (57 mi) WSW of here earthquakes near Powell County
Deer Lodge County, MT 94 km (58 mi) NW of here earthquakes near Deer Lodge County
Mineral County, MT 94 km (58 mi) SE of here earthquakes near Mineral County

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

Aftershocks so far

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

  1. 1.5 6 km S of Frenchtown, Montana
  2. 1.7 6 km S of Frenchtown, Montana
  3. 1.9 6 km S of Huson, Montana
  4. 1.9 3 km SSW of Alberton, Montana
  5. 1.7 4 km WNW of Wye, Montana
  6. 1.7 4 km SSW of Alberton, Montana
  7. 2.1 3 km S of Alberton, Montana
  8. 2.2 1 km SE of Alberton, Montana
  9. 1.8 2 km S of Turah, Montana
  10. 1.8 1 km SE of Alberton, 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.