QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

12 km SW of Seeley Lake, Montana

· 11 km deep · released about 5.7 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Missoula County 23 kmPowell County 58 kmLake County 71 kmGranite County 79 kmLewis and Clark County 92 kmMineral County 112 kmDeer Lodge County 117 kmRavalli County 119 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 1.5 (ml)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Missoula County, 23 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 710 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 5.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.7 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 47.0952, -113.6033. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Missoula County, MT 23 km (14 mi) ENE of here earthquakes near Missoula County
Powell County, MT 58 km (36 mi) WNW of here earthquakes near Powell County
Lake County, MT 71 km (44 mi) SSE of here earthquakes near Lake County
Granite County, MT 79 km (49 mi) N of here earthquakes near Granite County
Lewis and Clark County, MT 92 km (57 mi) W of here earthquakes near Lewis and Clark County
Mineral County, MT 112 km (70 mi) E of here earthquakes near Mineral County

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

Aftershocks so far

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

  1. 0.9 9 km WSW of Condon, Montana
  2. 3.2 3 km NE of Seeley Lake, Montana
  3. 2.4 32 km ENE of Seeley Lake, Montana
  4. 2.6 31 km ENE of Seeley Lake, Montana
  5. 2.1 25 km ENE of Seeley Lake, Montana
  6. 1.9 15 km N of Seeley Lake, Montana
  7. 1.9 18 km E of Saint Ignatius, Montana
  8. 2.6 13 km ESE of Kicking Horse, Montana
  9. 3.1 27 km NE of Seeley Lake, Montana
  10. 2.9 22 km WSW of Ovando, Montana
  11. 2.3 34 km NE of Seeley Lake, Montana
  12. 1.8 20 km N of Ovando, Montana
  13. 2.4 10 km S of Ovando, Montana
  14. 2.4 16 km ENE of Seeley Lake, Montana
  15. 2.7 6 km SSE 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

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