QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

20 km N of Condon, Montana

· 8.0 km deep · released about 1,200 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 29 kmFlathead County 69 kmMissoula County 78 kmTeton County 108 kmSanders County 110 kmPowell County 113 kmLewis and Clark 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 3.1 (ml)
Depth
8.0 km below the surface
Felt
no reports yet
Nearest
Lake County, 29 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1962 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 1,200 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 290,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 13,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 9,100× the energy of this one
  4. This earthquake M 3.1 about 1,200 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.2× 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 47.7137, -113.7128. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, MT 29 km (18 mi) ENE of here earthquakes near Lake County
Flathead County, MT 69 km (43 mi) SSE of here earthquakes near Flathead County
Missoula County, MT 78 km (48 mi) N of here earthquakes near Missoula County
Teton County, MT 108 km (67 mi) W of here earthquakes near Teton County
Sanders County, MT 110 km (68 mi) E of here earthquakes near Sanders County
Powell County, MT 113 km (70 mi) NNW of here earthquakes near Powell County

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

Aftershocks so far

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

  1. 1.9 5 km WSW of Condon, Montana
  2. 2.0 21 km SSE of Swan Lake, Montana
  3. 1.9 12 km E of Finley Point, Montana
  4. 2.2 12 km ESE of Finley Point, Montana
  5. 1.6 12 km ESE of Finley Point, Montana
  6. 2.4 Western Montana
  7. 1.9 18 km E of Finley Point, Montana
  8. 2.3 19 km NNE of Seeley Lake, Montana
  9. 2.0 2 km ESE of Bear Dance, Montana
  10. 1.5 7 km ENE of Saint Ignatius, Montana
  11. 2.3 14 km SSE of Swan Lake, Montana
  12. 3.3 16 km SSE of Swan Lake, Montana
  13. 2.3 6 km N of Saint Ignatius, Montana
  14. 1.7 8 km NE of Bigfork, Montana
  15. 1.9 10 km WNW of Condon, MT

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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