QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

15 km WSW of Ovando, Montana

· 5.7 km deep · released about 750 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Powell County 32 kmMissoula County 45 kmGranite County 63 kmLewis and Clark County 73 kmLake County 96 kmDeer Lodge County 97 kmRavalli 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 2.9 (ml)
Depth
5.7 km below the surface
Felt
no reports yet
Nearest
Powell County, 32 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1962 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 750 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 20,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 14,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.3× the energy of this one
  4. This earthquake M 2.9 about 750 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 46.9562, -113.3147. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Powell County, MT 32 km (20 mi) WNW of here earthquakes near Powell County
Missoula County, MT 45 km (28 mi) E of here earthquakes near Missoula County
Granite County, MT 63 km (39 mi) N of here earthquakes near Granite County
Lewis and Clark County, MT 73 km (45 mi) WSW of here earthquakes near Lewis and Clark County
Lake County, MT 96 km (60 mi) SE of here earthquakes near Lake County
Deer Lodge County, MT 97 km (60 mi) N of here earthquakes near Deer Lodge County

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

Aftershocks so far

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

  1. 2.4 Western Montana
  2. 2.4 3 km NNE of Clinton, Montana
  3. 3.2 2 km NNW of Ovando, Montana
  4. 2.0 2 km WSW of Drummond, Montana
  5. 3.1 15 km SSW of Ovando, Montana
  6. 2.8 17 km SSW of Lincoln, Montana
  7. 2.1 13 km NE of Seeley Lake, Montana
  8. 1.6 23 km SW of Ovando, Montana
  9. 1.6 11 km W of Lincoln, Montana
  10. 2.0 22 km SE of Clinton, Montana
  11. 2.4 9 km W of Lincoln, Montana
  12. 1.6 22 km SE of Clinton, Montana
  13. 1.6 18 km SSW of Lincoln, Montana
  14. 2.0 9 km WNW of Lincoln, Montana
  15. 1.9 33 km NE 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.