QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

13 km E of Ronan, Montana

· 27 km deep · released about 340 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 16 kmMissoula County 58 kmFlathead County 83 kmSanders County 97 kmMineral County 100 kmPowell County 109 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
27 km below the surface
Felt
no reports yet
Nearest
Lake County, 16 km NW
Nearest mapped fault
Mission fault, 7 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2354 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

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 47.5524, -113.9200. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, MT 16 km (10 mi) SE of here earthquakes near Lake County
Missoula County, MT 58 km (36 mi) N of here earthquakes near Missoula County
Flathead County, MT 83 km (52 mi) S of here earthquakes near Flathead County
Sanders County, MT 97 km (60 mi) ESE of here earthquakes near Sanders County
Mineral County, MT 100 km (62 mi) ENE of here earthquakes near Mineral County
Powell County, MT 109 km (67 mi) NW of here earthquakes near Powell 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 14 km WNW of Condon, Montana
  2. 1.6 16 km WSW of Kerr, Montana
  3. 1.5 5 km NE of Saint Ignatius, Montana
  4. 1.8 17 km E of Arlee, Montana
  5. 3.0 17 km SSE of Swan Lake, Montana
  6. 1.6 9 km ENE of Ronan, Montana
  7. 1.5 6 km SW of Condon, Montana
  8. 1.6 15 km ESE of Condon, Montana
  9. 1.6 4 km W of Ravalli, Montana
  10. 1.5 8 km ESE of Woods Bay, Montana
  11. 2.1 18 km SSE of Swan Lake, Montana
  12. 1.8 17 km SSW of Condon, Montana
  13. 1.9 17 km SSW of Condon, Montana
  14. 1.5 11 km ENE of Ronan, Montana
  15. 2.0 8 km S of Condon, 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.