QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

Western Montana

· 10 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Missoula County 36 kmLake County 39 kmPowell County 87 kmMineral County 100 kmFlathead County 107 kmGranite County 110 kmLewis and Clark County 110 kmSanders County 113 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 1.5 (ml)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Missoula County, 36 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1366 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 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 47.3497, -113.8056. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Missoula County, MT 36 km (23 mi) N of here earthquakes near Missoula County
Lake County, MT 39 km (24 mi) SSE of here earthquakes near Lake County
Powell County, MT 87 km (54 mi) NW of here earthquakes near Powell County
Mineral County, MT 100 km (62 mi) ENE of here earthquakes near Mineral County
Flathead County, MT 107 km (66 mi) S of here earthquakes near Flathead County
Granite County, MT 110 km (68 mi) NNW of here earthquakes near Granite County

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

Aftershocks so far

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

  1. 0.9 9 km WSW of Condon, Montana
  2. 3.2 3 km NE of Seeley Lake, Montana
  3. 1.9 15 km N of Seeley Lake, Montana
  4. 1.9 18 km E of Saint Ignatius, 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. 2.1 5 km WNW of Saint Ignatius, Montana
  9. 1.7 20 km E of Finley Point, Montana
  10. 1.6 20 km E of Finley Point, Montana
  11. 1.6 20 km E of Finley Point, Montana
  12. 2.1 20 km E of Finley Point, Montana
  13. 1.8 17 km E of Condon, Montana
  14. 1.7 19 km E of Finley Point, Montana
  15. 1.6 16 km NNE of Condon, 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.