QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

10 km WNW of Condon, MT

· 20 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 21 kmMissoula County 61 kmFlathead County 82 kmSanders County 103 kmPowell County 106 kmMineral County 106 kmTeton County 119 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 1.9 (ml)
Depth
20 km below the surface
Felt
no reports yet
Nearest
Lake County, 21 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2431 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
  3. Around the size people start to feel M 3.0 45× the energy of this one
  4. This earthquake M 1.9 about 21 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 47.5698, -113.8317. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, MT 21 km (13 mi) ESE of here earthquakes near Lake County
Missoula County, MT 61 km (38 mi) N of here earthquakes near Missoula County
Flathead County, MT 82 km (51 mi) SSE of here earthquakes near Flathead County
Sanders County, MT 103 km (64 mi) E of here earthquakes near Sanders County
Powell County, MT 106 km (66 mi) NW of here earthquakes near Powell County
Mineral County, MT 106 km (66 mi) ENE of here earthquakes near Mineral County

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

Aftershocks so far

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

  1. 1.6 6 km SW of Woods Bay, Montana
  2. 1.8 14 km WNW of Condon, Montana
  3. 1.5 5 km NE of Saint Ignatius, Montana
  4. 2.1 27 km E of Swan Lake, Montana
  5. 2.5 24 km E of Swan Lake, Montana
  6. 2.4 27 km E of Swan Lake, Montana
  7. 1.8 17 km E of Arlee, Montana
  8. 3.0 17 km SSE of Swan Lake, Montana
  9. 1.6 9 km ENE of Ronan, Montana
  10. 1.5 6 km SW of Condon, Montana
  11. 1.6 15 km ESE of Condon, Montana
  12. 1.6 4 km W of Ravalli, Montana
  13. 1.5 8 km ESE of Woods Bay, Montana
  14. 2.1 18 km SSE of Swan Lake, Montana
  15. 1.8 17 km SSW 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.