QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4ml

0 km WNW of Dayton, Montana

· 3.3 km deep · released about 1.7 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 30 kmFlathead County 51 kmSanders County 68 kmMissoula County 98 kmMineral County 102 kmLincoln County 115 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 3.4 (ml)
Depth
3.3 km below the surface
Felt
29 reports · strongest reported intensity IV
Nearest
Lake County, 30 km SSE
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. 29 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.7 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 99,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,100× the energy of this one
  4. This earthquake M 3.4 about 1.7 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.6× 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 47.8697, -114.2900. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, MT 30 km (18 mi) NNW of here earthquakes near Lake County
Flathead County, MT 51 km (31 mi) SSW of here earthquakes near Flathead County
Sanders County, MT 68 km (42 mi) E of here earthquakes near Sanders County
Missoula County, MT 98 km (61 mi) NNW of here earthquakes near Missoula County
Mineral County, MT 102 km (63 mi) NE of here earthquakes near Mineral County
Lincoln County, MT 115 km (72 mi) SE of here earthquakes near Lincoln County

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

Aftershocks so far

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

  1. 1.7 3 km E of Forest Hill Village, Montana
  2. 2.5 2 km WSW of Bear Dance, Montana
  3. 1.9 4 km NE of Bear Dance, Montana
  4. 1.9 11 km SE of Hot Springs, Montana
  5. 1.6 20 km E of Finley Point, Montana
  6. 1.8 13 km E of Pablo, Montana
  7. 2.0 6 km ESE of Bear Dance, Montana
  8. 1.5 18 km E of Finley Point, Montana
  9. 1.9 8 km NNW of Niarada, Montana
  10. 1.7 19 km SSE of Swan Lake, Montana
  11. 1.9 12 km E of Finley Point, Montana
  12. 2.2 12 km ESE of Finley Point, Montana
  13. 1.6 12 km ESE of Finley Point, Montana
  14. 1.9 18 km E of Finley Point, Montana
  15. 2.0 2 km ESE 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.