QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

20 km ENE of Seeley Lake, Montana

· 14 km deep · released about 340 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Powell County 48 kmMissoula County 56 kmLewis and Clark County 64 kmLake County 80 kmGranite County 94 kmTeton County 96 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 2.7 (ml)
Depth
14 km below the surface
Felt
5 reports · strongest reported intensity III
Nearest
Powell County, 48 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2521 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 5 people have reported feeling it to USGS.

How big was it?

This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 47.2300, -113.2177. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Powell County, MT 48 km (30 mi) NNW of here earthquakes near Powell County
Missoula County, MT 56 km (35 mi) ENE of here earthquakes near Missoula County
Lewis and Clark County, MT 64 km (40 mi) W of here earthquakes near Lewis and Clark County
Lake County, MT 80 km (50 mi) SE of here earthquakes near Lake County
Granite County, MT 94 km (58 mi) N of here earthquakes near Granite County
Teton County, MT 96 km (60 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. 1.8 25 km W of Augusta, Montana
  2. 2.3 18 km SSW of Ovando, Montana
  3. 1.6 36 km NE of Seeley Lake, Montana
  4. 2.4 37 km NE of Seeley Lake, Montana
  5. 1.5 8 km WNW of Lincoln, Montana
  6. 1.7 8 km WNW of Lincoln, Montana
  7. 2.0 27 km W of Augusta, Montana
  8. 1.5 37 km NE of Seeley Lake, Montana
  9. 1.6 35 km NE of Seeley Lake, Montana
  10. 2.2 27 km NNW of Lincoln, Montana
  11. 2.4 8 km WSW of Lincoln, Montana
  12. 2.0 36 km NE of Seeley Lake, Montana
  13. 1.7 37 km NE of Seeley Lake, Montana
  14. 1.6 36 km NE of Seeley Lake, Montana
  15. 2.8 36 km NE 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.