QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

5 km NE of Saint Ignatius, Montana

· 16 km deep · released about 5.9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 32 kmMissoula County 39 kmMineral County 83 kmSanders County 96 kmPowell County 102 kmFlathead County 104 kmGranite 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 1.5 (ml)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Lake County, 32 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 766 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 5.9 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 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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 47.3590, -114.0415. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, MT 32 km (20 mi) S of here earthquakes near Lake County
Missoula County, MT 39 km (24 mi) NNW of here earthquakes near Missoula County
Mineral County, MT 83 km (51 mi) ENE of here earthquakes near Mineral County
Sanders County, MT 96 km (60 mi) ESE of here earthquakes near Sanders County
Powell County, MT 102 km (63 mi) NW of here earthquakes near Powell County
Flathead County, MT 104 km (65 mi) S of here earthquakes near Flathead County

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

Aftershocks so far

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

  1. 0.9 9 km WSW of Condon, Montana
  2. 1.9 2 km NNE of Alberton, Montana
  3. 1.9 15 km N of Seeley Lake, Montana
  4. 1.5 6 km S of Frenchtown, Montana
  5. 1.7 6 km S of Frenchtown, Montana
  6. 1.9 18 km E of Saint Ignatius, Montana
  7. 1.9 6 km S of Huson, Montana
  8. 1.7 2 km ENE of Alberton, Montana
  9. 2.2 2 km NE of Alberton, Montana
  10. 1.7 4 km WNW of Wye, Montana
  11. 2.6 13 km ESE of Kicking Horse, Montana
  12. 2.0 15 km ENE of Ronan, Montana
  13. 2.1 5 km WNW of Saint Ignatius, Montana
  14. 1.7 20 km E of Finley Point, Montana
  15. 1.6 20 km E of Finley Point, 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.