QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

17 km SSE of Swan Lake, Montana

· 10 km deep · released about 950 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 29 kmFlathead County 61 kmMissoula County 85 kmSanders County 106 kmTeton County 110 kmGlacier County 117 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 3.0 (ml)
Depth
10 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Lake County, 29 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 862 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 950 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 47.7880, -113.7561. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, MT 29 km (18 mi) ENE of here earthquakes near Lake County
Flathead County, MT 61 km (38 mi) SSE of here earthquakes near Flathead County
Missoula County, MT 85 km (53 mi) N of here earthquakes near Missoula County
Sanders County, MT 106 km (66 mi) E of here earthquakes near Sanders County
Teton County, MT 110 km (68 mi) W of here earthquakes near Teton County
Glacier County, MT 117 km (73 mi) SSW of here earthquakes near Glacier County

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

Aftershocks so far

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

  1. 0.9 9 km WSW of Condon, Montana
  2. 1.9 18 km E of Saint Ignatius, Montana
  3. 2.4 9 km SSW of Bear Dance, Montana
  4. 1.6 1 km SSW of Dayton, Montana
  5. 1.8 17 km SSE of Swan Lake, Montana
  6. 2.6 13 km ESE of Kicking Horse, Montana
  7. 2.0 15 km ENE of Ronan, Montana
  8. 1.7 20 km E of Finley Point, Montana
  9. 1.6 20 km E of Finley Point, Montana
  10. 1.6 20 km E of Finley Point, Montana
  11. 2.1 20 km E of Finley Point, Montana
  12. 1.8 17 km E of Condon, Montana
  13. 1.7 19 km E of Finley Point, Montana
  14. 1.6 16 km NNE of Condon, Montana
  15. 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.