QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2ml

47 km WNW of Augusta, Montana

· 16 km deep · released about 67 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Teton County 55 kmLewis and Clark County 75 kmLake County 83 kmPondera County 84 kmPowell County 91 kmMissoula County 99 kmFlathead County 106 kmGlacier County 116 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
Teton County, 55 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2067 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 67 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 5.8 230,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 160,000× 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 67 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 47.6652, -112.9767. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Teton County, MT 55 km (34 mi) WSW of here earthquakes near Teton County
Lewis and Clark County, MT 75 km (47 mi) NW of here earthquakes near Lewis and Clark County
Lake County, MT 83 km (52 mi) E of here earthquakes near Lake County
Pondera County, MT 84 km (52 mi) SW of here earthquakes near Pondera County
Powell County, MT 91 km (57 mi) N of here earthquakes near Powell County
Missoula County, MT 99 km (61 mi) NE of here earthquakes near Missoula County

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

Aftershocks so far

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

  1. 3.1 27 km NE of Seeley Lake, Montana
  2. 1.5 40 km NE of Seeley Lake, Montana
  3. 2.2 40 km NE of Seeley Lake, Montana
  4. 1.6 40 km ENE of Condon, Montana
  5. 1.5 26 km W of Augusta, Montana
  6. 2.3 34 km NE of Seeley Lake, Montana
  7. 2.2 43 km NNE of Ovando, Montana
  8. 2.5 42 km NNE of Ovando, Montana
  9. 1.8 17 km E of Condon, Montana
  10. 3.0 26 km WSW of Augusta, Montana
  11. 1.6 24 km W of Augusta, Montana
  12. 2.2 33 km NE of Seeley Lake, Montana
  13. 3.5 32 km NE of Seeley Lake, Montana
  14. 1.7 25 km ENE of Seeley Lake, Montana
  15. 1.7 25 km ENE of Seeley Lake, 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.