QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2ml

7 km WNW of Lake Mary Ronan, Montana

· 9.5 km deep · released about 54 lb of TNT

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10 km30 km60 km120 km N Lake County 47 kmFlathead County 48 kmSanders County 58 kmLincoln County 97 kmMineral County 104 kmMissoula 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
9.5 km below the surface
Felt
no reports yet
Nearest
Lake County, 47 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 672 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 54 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 5.8 280,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 200,000× the energy of this one
  3. Around the size people start to feel M 3.0 18× the energy of this one
  4. This earthquake M 2.2 about 54 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 47.9743, -114.4792. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, MT 47 km (29 mi) NW of here earthquakes near Lake County
Flathead County, MT 48 km (30 mi) SW of here earthquakes near Flathead County
Sanders County, MT 58 km (36 mi) ENE of here earthquakes near Sanders County
Lincoln County, MT 97 km (60 mi) SE of here earthquakes near Lincoln County
Mineral County, MT 104 km (65 mi) NNE of here earthquakes near Mineral County
Missoula County, MT 114 km (71 mi) NNW of here earthquakes near Missoula County

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

Aftershocks so far

11 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. 2.4 9 km SSW of Bear Dance, Montana
  5. 1.6 1 km SSW of Dayton, Montana
  6. 1.8 12 km NE of Forest Hill Village, Montana
  7. 1.9 12 km ESE of Evergreen, Montana
  8. 1.6 6 km SW of Woods Bay, Montana
  9. 1.7 1 km S of Woods Bay, Montana
  10. 2.1 6 km SW of Woods Bay, Montana
  11. 1.6 6 km SW of Woods Bay, 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.