QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

7 km ENE of Saint Ignatius, Montana

· 13 km deep · released about 6.2 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 33 kmMissoula County 37 kmMineral County 85 kmSanders County 98 kmPowell County 100 kmFlathead County 105 kmGranite 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 1.5 (ml)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Lake County, 33 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2298 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 6.2 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 1,700,000× the energy of this one
  3. Around the size people start to feel M 3.0 150× the energy of this one
  4. This earthquake M 1.5 about 6.2 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 47.3530, -114.0147. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, MT 33 km (20 mi) S of here earthquakes near Lake County
Missoula County, MT 37 km (23 mi) NNW of here earthquakes near Missoula County
Mineral County, MT 85 km (53 mi) ENE of here earthquakes near Mineral County
Sanders County, MT 98 km (61 mi) ESE of here earthquakes near Sanders County
Powell County, MT 100 km (62 mi) NW of here earthquakes near Powell County
Flathead County, MT 105 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

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

  1. 1.7 2 km ENE of Alberton, Montana
  2. 2.2 2 km NE of Alberton, Montana
  3. 1.7 4 km WNW of Wye, Montana
  4. 2.6 13 km ESE of Kicking Horse, Montana
  5. 2.0 15 km ENE of Ronan, Montana
  6. 2.1 5 km WNW of Saint Ignatius, Montana
  7. 1.7 20 km E of Finley Point, Montana
  8. 1.6 20 km E of Finley Point, Montana
  9. 1.6 20 km E of Finley Point, Montana
  10. 2.1 20 km E of Finley Point, Montana
  11. 1.8 17 km E of Condon, Montana
  12. 1.7 19 km E of Finley Point, Montana
  13. 1.6 16 km NNE of Condon, Montana
  14. 1.8 14 km WNW of Condon, Montana
  15. 1.5 12 km SW of Seeley Lake, 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.