QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

13 km NE of Seeley Lake, Montana

· 16 km deep · released about 37 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Missoula County 48 kmPowell County 57 kmLake County 68 kmLewis and Clark County 76 kmGranite County 97 kmTeton County 102 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 2.1 (ml)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Missoula County, 48 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2794 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 37 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 410,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 290,000× the energy of this one
  3. Around the size people start to feel M 3.0 26× the energy of this one
  4. This earthquake M 2.1 about 37 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 47.2652, -113.3653. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Missoula County, MT 48 km (30 mi) ENE of here earthquakes near Missoula County
Powell County, MT 57 km (36 mi) NW of here earthquakes near Powell County
Lake County, MT 68 km (43 mi) SE of here earthquakes near Lake County
Lewis and Clark County, MT 76 km (47 mi) WNW of here earthquakes near Lewis and Clark County
Granite County, MT 97 km (60 mi) N of here earthquakes near Granite County
Teton County, MT 102 km (63 mi) SW of here earthquakes near Teton County

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

Aftershocks so far

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

  1. 1.5 37 km NE of Seeley Lake, Montana
  2. 1.6 35 km NE of Seeley Lake, Montana
  3. 2.2 27 km NNW of Lincoln, Montana
  4. 2.0 36 km NE of Seeley Lake, Montana
  5. 1.7 37 km NE of Seeley Lake, Montana
  6. 1.6 36 km NE of Seeley Lake, Montana
  7. 2.8 36 km NE of Seeley Lake, Montana
  8. 2.0 37 km NE of Seeley Lake, Montana
  9. 2.2 36 km NE of Seeley Lake, Montana
  10. 1.8 36 km NE of Seeley Lake, Montana
  11. 2.2 36 km NE of Seeley Lake, Montana
  12. 1.5 36 km NE of Seeley Lake, Montana
  13. 1.9 36 km NE of Seeley Lake, Montana
  14. 2.2 36 km NE of Seeley Lake, Montana
  15. 1.5 10 km ENE 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.