QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

14 km N of Seeley Lake, Montana

· 10 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Missoula County 42 kmLake County 56 kmPowell County 68 kmLewis and Clark County 88 kmGranite County 102 kmTeton County 109 kmFlathead County 116 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
10 km below the surface
Felt
no reports yet
Nearest
Missoula County, 42 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1446 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 43 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 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 47.3116, -113.5171. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Missoula County, MT 42 km (26 mi) NE of here earthquakes near Missoula County
Lake County, MT 56 km (35 mi) SE of here earthquakes near Lake County
Powell County, MT 68 km (42 mi) NW of here earthquakes near Powell County
Lewis and Clark County, MT 88 km (55 mi) WNW of here earthquakes near Lewis and Clark County
Granite County, MT 102 km (63 mi) N of here earthquakes near Granite County
Teton County, MT 109 km (67 mi) WSW of here earthquakes near Teton County

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

Aftershocks so far

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

  1. 3.2 3 km NE of Seeley Lake, Montana
  2. 2.4 32 km ENE of Seeley Lake, Montana
  3. 2.6 31 km ENE of Seeley Lake, Montana
  4. 2.1 25 km ENE of Seeley Lake, Montana
  5. 1.9 15 km N of Seeley Lake, Montana
  6. 1.9 18 km E of Saint Ignatius, Montana
  7. 2.6 13 km ESE of Kicking Horse, Montana
  8. 3.1 27 km NE of Seeley Lake, Montana
  9. 1.5 40 km NE of Seeley Lake, Montana
  10. 2.2 40 km NE of Seeley Lake, Montana
  11. 1.6 40 km ENE of Condon, Montana
  12. 2.9 22 km WSW of Ovando, Montana
  13. 2.3 34 km NE of Seeley Lake, Montana
  14. 2.0 15 km ENE of Ronan, Montana
  15. 1.8 20 km N of Ovando, 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

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