QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

6 km W of Drummond, Montana

· 6.7 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Powell County 30 kmGranite County 34 kmMissoula County 64 kmDeer Lodge County 65 kmLewis and Clark County 82 kmRavalli County 94 kmSilver Bow County 97 kmJefferson County 109 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 1.8 (ml)
Depth
6.7 km below the surface
Felt
no reports yet
Nearest
Powell County, 30 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1915 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× the energy of this one
  4. This earthquake M 1.8 about 15 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 46.6722, -113.2315. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Powell County, MT 30 km (19 mi) SW of here earthquakes near Powell County
Granite County, MT 34 km (21 mi) NNE of here earthquakes near Granite County
Missoula County, MT 64 km (40 mi) SE of here earthquakes near Missoula County
Deer Lodge County, MT 65 km (40 mi) N of here earthquakes near Deer Lodge County
Lewis and Clark County, MT 82 km (51 mi) SW of here earthquakes near Lewis and Clark County
Ravalli County, MT 94 km (59 mi) NE of here earthquakes near Ravalli County

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

Aftershocks so far

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

  1. 1.7 16 km W of Lincoln, Montana
  2. 3.2 12 km NNW of Avon, 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. 2.4 10 km S of Ovando, Montana
  8. 1.8 17 km ENE of Drummond, Montana
  9. 2.3 16 km ENE of Drummond, Montana
  10. 1.9 7 km WSW of Drummond, Montana
  11. 1.6 15 km WNW of Lincoln, Montana
  12. 1.9 10 km NW of Garrison, Montana
  13. 1.8 17 km W of Lincoln, Montana
  14. 1.7 10 km ESE of Ovando, Montana
  15. 2.3 Western 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.