QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2ml

2 km ESE of Ravalli, Montana

· 10 km deep · released about 1,900 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Missoula County 33 kmLake County 42 kmMineral County 72 kmSanders County 94 kmPowell County 104 kmGranite County 112 kmFlathead 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 3.2 (ml)
Depth
10 km below the surface
Felt
50 reports · strongest reported intensity IV
Nearest
Missoula County, 33 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1365 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 50 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,900 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 180,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 7,900× the energy of this one
  3. Magna, Utah 2020 M 5.7 5,600× the energy of this one
  4. This earthquake M 3.2 about 1,900 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 2× more

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 47.2691, -114.1547. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Missoula County, MT 33 km (21 mi) NW of here earthquakes near Missoula County
Lake County, MT 42 km (26 mi) S of here earthquakes near Lake County
Mineral County, MT 72 km (45 mi) ENE of here earthquakes near Mineral County
Sanders County, MT 94 km (59 mi) SE of here earthquakes near Sanders County
Powell County, MT 104 km (65 mi) WNW of here earthquakes near Powell County
Granite County, MT 112 km (69 mi) NNW of here earthquakes near Granite County

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

Aftershocks so far

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

  1. 0.9 9 km WSW of Condon, Montana
  2. 1.9 2 km NNE of Alberton, Montana
  3. 1.5 6 km S of Frenchtown, Montana
  4. 1.7 6 km S of Frenchtown, Montana
  5. 1.9 18 km E of Saint Ignatius, Montana
  6. 1.9 6 km S of Huson, Montana
  7. 1.9 3 km SSW of Alberton, Montana
  8. 1.7 2 km ENE of Alberton, Montana
  9. 2.2 2 km NE of Alberton, Montana
  10. 1.7 4 km WNW of Wye, Montana
  11. 2.6 13 km ESE of Kicking Horse, Montana
  12. 1.7 4 km SSW of Alberton, Montana
  13. 2.1 3 km S of Alberton, Montana
  14. 2.0 15 km ENE of Ronan, Montana
  15. 2.1 5 km WNW of Saint Ignatius, 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

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