QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

18 km SSW of Ovando, Montana

· 4.3 km deep · released about 77 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Powell County 24 kmMissoula County 52 kmGranite County 55 kmLewis and Clark County 71 kmDeer Lodge County 87 kmLake County 107 kmRavalli County 110 kmSilver Bow 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 2.3 (ml)
Depth
4.3 km below the surface
Felt
no reports yet
Nearest
Powell County, 24 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1803 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 77 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 140,000× the energy of this one
  3. Around the size people start to feel M 3.0 12× the energy of this one
  4. This earthquake M 2.3 about 77 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 46.8708, -113.2423. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Powell County, MT 24 km (15 mi) W of here earthquakes near Powell County
Missoula County, MT 52 km (33 mi) ESE of here earthquakes near Missoula County
Granite County, MT 55 km (34 mi) NNE of here earthquakes near Granite County
Lewis and Clark County, MT 71 km (44 mi) WSW of here earthquakes near Lewis and Clark County
Deer Lodge County, MT 87 km (54 mi) N of here earthquakes near Deer Lodge County
Lake County, MT 107 km (66 mi) SE of here earthquakes near Lake County

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

Aftershocks so far

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

  1. 1.7 16 km W of Lincoln, Montana
  2. 1.8 20 km N of Lincoln, Montana
  3. 1.6 12 km N of Garrison, Montana
  4. 2.9 22 km WSW of Ovando, Montana
  5. 2.3 17 km S of Lincoln, Montana
  6. 2.1 17 km S of Lincoln, Montana
  7. 1.8 20 km N of Ovando, Montana
  8. 2.4 10 km S of Ovando, Montana
  9. 2.4 16 km ENE of Seeley Lake, Montana
  10. 1.8 17 km ENE of Drummond, Montana
  11. 2.3 16 km ENE of Drummond, Montana
  12. 2.7 6 km SSE of Seeley Lake, Montana
  13. 1.9 6 km SSE of Seeley Lake, Montana
  14. 1.5 12 km SW of Seeley Lake, Montana
  15. 1.9 7 km WSW of Drummond, 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.