QuakeIndex

Earthquake · reviewed by a seismologist

M 3.8mwr

24 km ENE of Seeley Lake, Montana

· 22 km deep · released about 7.6 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Powell County 54 kmMissoula County 60 kmLewis and Clark County 65 kmLake County 77 kmTeton County 91 kmGranite County 101 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 3.8 (mwr)
Depth
22 km below the surface
Felt
131 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
Nearest
Powell County, 54 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 718 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 131 people have reported feeling it to USGS.

How big was it?

This earthquake released about 7.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.8 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 22,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 710× the energy of this one
  4. This earthquake M 3.8 about 7.6 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 16× more

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 47.2903, -113.2072. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Powell County, MT 54 km (33 mi) NNW of here earthquakes near Powell County
Missoula County, MT 60 km (37 mi) ENE of here earthquakes near Missoula County
Lewis and Clark County, MT 65 km (40 mi) WNW of here earthquakes near Lewis and Clark County
Lake County, MT 77 km (48 mi) ESE of here earthquakes near Lake County
Teton County, MT 91 km (57 mi) SW of here earthquakes near Teton County
Granite County, MT 101 km (63 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

33 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. 1.7 16 km W of Lincoln, Montana
  7. 1.8 20 km N of Lincoln, 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. 1.5 26 km W of Augusta, Montana
  14. 2.3 34 km NE of Seeley Lake, 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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.