QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

12 km SE of Seeley Lake, Montana

· 12 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Missoula County 40 kmPowell County 44 kmLewis and Clark County 75 kmGranite County 78 kmLake County 81 kmDeer Lodge County 113 kmTeton 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 1.8 (ml)
Depth
12 km below the surface
Felt
no reports yet
Nearest
Missoula County, 40 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1609 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 16 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 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 47.0945, -113.3775. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Missoula County, MT 40 km (25 mi) E of here earthquakes near Missoula County
Powell County, MT 44 km (27 mi) NW of here earthquakes near Powell County
Lewis and Clark County, MT 75 km (47 mi) W of here earthquakes near Lewis and Clark County
Granite County, MT 78 km (48 mi) N of here earthquakes near Granite County
Lake County, MT 81 km (50 mi) SE of here earthquakes near Lake County
Deer Lodge County, MT 113 km (70 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

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

  1. 2.1 25 km ENE of Seeley Lake, Montana
  2. 1.9 15 km N of Seeley Lake, Montana
  3. 1.9 18 km E of Saint Ignatius, Montana
  4. 1.7 16 km W of Lincoln, Montana
  5. 3.1 27 km NE of Seeley Lake, Montana
  6. 1.5 40 km NE of Seeley Lake, Montana
  7. 2.2 40 km NE of Seeley Lake, Montana
  8. 2.9 22 km WSW of Ovando, Montana
  9. 2.3 34 km NE of Seeley Lake, Montana
  10. 1.8 20 km N of Ovando, Montana
  11. 2.4 10 km S of Ovando, Montana
  12. 2.2 43 km NNE of Ovando, Montana
  13. 2.5 42 km NNE of Ovando, Montana
  14. 2.4 16 km ENE of Seeley Lake, Montana
  15. 1.8 17 km ENE 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.