QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

4 km W of Somers, Montana

· 5.0 km deep · released about 680 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Flathead County 30 kmLake County 50 kmSanders County 76 kmLincoln County 103 kmGlacier County 118 kmMissoula 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 2.9 (ml)
Depth
5.0 km below the surface
Felt
35 reports · strongest reported intensity III
Nearest
Flathead County, 30 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3099 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 35 people have reported feeling it to USGS.

How big was it?

This earthquake released about 680 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 22,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 16,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.4× the energy of this one
  4. This earthquake M 2.9 about 680 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 48.0734, -114.2761. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Flathead County, MT 30 km (18 mi) SW of here earthquakes near Flathead County
Lake County, MT 50 km (31 mi) NNW of here earthquakes near Lake County
Sanders County, MT 76 km (47 mi) ENE of here earthquakes near Sanders County
Lincoln County, MT 103 km (64 mi) ESE of here earthquakes near Lincoln County
Glacier County, MT 118 km (73 mi) SW of here earthquakes near Glacier County
Missoula County, MT 120 km (74 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

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

  1. 1.8 17 km WNW of Niarada, Montana
  2. 1.6 Western Montana
  3. 2.1 8 km NNW of Bigfork, Montana
  4. 1.7 11 km NW of Batavia, Montana
  5. 2.9 4 km N of Elmo, Montana
  6. 1.6 12 km NNW of Batavia, Montana
  7. 2.5 6 km WNW of Bear Dance, Montana
  8. 2.2 8 km WNW of Niarada, Montana
  9. 1.6 4 km ESE of Rollins, Montana
  10. 1.6 13 km WNW of Marion, Montana
  11. 2.1 16 km NNE of Swan Lake, Montana
  12. 2.1 10 km SW of Whitefish, Montana
  13. 1.7 3 km E of Forest Hill Village, Montana
  14. 1.6 13 km E of Martin City, Montana
  15. 2.5 2 km WSW of Bear Dance, 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.