QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

19 km NNE of Seeley Lake, Montana

· 10 km deep · released about 85 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Missoula County 51 kmLake County 61 kmPowell County 67 kmLewis and Clark County 81 kmTeton County 99 kmGranite County 106 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 2.3 (ml)
Depth
10 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Missoula County, 51 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1510 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 11× the energy of this one
  4. This earthquake M 2.3 about 85 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 47.3490, -113.4056. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Missoula County, MT 51 km (32 mi) NE of here earthquakes near Missoula County
Lake County, MT 61 km (38 mi) ESE of here earthquakes near Lake County
Powell County, MT 67 km (41 mi) NNW of here earthquakes near Powell County
Lewis and Clark County, MT 81 km (50 mi) WNW of here earthquakes near Lewis and Clark County
Teton County, MT 99 km (62 mi) WSW of here earthquakes near Teton County
Granite County, MT 106 km (66 mi) N of here earthquakes near Granite 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. 1.6 15 km ESE of Condon, Montana
  2. 1.5 20 km ENE of Seeley Lake, Montana
  3. 1.8 17 km SSW of Condon, Montana
  4. 1.5 39 km NNE of Ovando, Montana
  5. 1.9 17 km SSW of Condon, Montana
  6. 2.5 25 km ENE of Seeley Lake, Montana
  7. 2.0 8 km S of Condon, Montana
  8. 2.4 21 km ENE of Seeley Lake, Montana
  9. 1.9 21 km NNW of Condon, Montana
  10. 1.6 36 km NE of Seeley Lake, Montana
  11. 2.0 40 km WSW of Augusta, Montana
  12. 1.5 Western Montana
  13. 2.3 26 km ESE of Condon, Montana
  14. 2.1 14 km N of Seeley Lake, Montana
  15. 1.8 12 km SE 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.