QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7mwr

3 km NE of Ravalli, Montana

· 12 km deep · released about 5.4 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Missoula County 36 kmLake County 39 kmMineral County 73 kmSanders County 93 kmPowell County 105 kmFlathead County 111 kmGranite 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 3.7 (mwr)
Depth
12 km below the surface
Felt
358 reports · strongest reported intensity V
Measured shaking
intensity IV (ShakeMap)
Nearest
Missoula County, 36 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1337 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 358 people have reported feeling it to USGS.

How big was it?

This earthquake released about 5.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 32,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,000× the energy of this one
  4. This earthquake M 3.7 about 5.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 11× 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 47.2961, -114.1463. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Missoula County, MT 36 km (22 mi) NNW of here earthquakes near Missoula County
Lake County, MT 39 km (24 mi) S of here earthquakes near Lake County
Mineral County, MT 73 km (46 mi) ENE of here earthquakes near Mineral County
Sanders County, MT 93 km (58 mi) ESE of here earthquakes near Sanders County
Powell County, MT 105 km (65 mi) WNW of here earthquakes near Powell County
Flathead County, MT 111 km (69 mi) S of here earthquakes near Flathead County

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

Aftershocks so far

31 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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