QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5ml

42 km NNE of Ovando, Montana

· 6.6 km deep · released about 170 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis and Clark County 56 kmPowell County 61 kmTeton County 72 kmMissoula County 78 kmLake County 85 kmPondera County 110 kmGranite County 115 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 2.5 (ml)
Depth
6.6 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Lewis and Clark County, 56 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 458 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 170 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 89,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 63,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.6× the energy of this one
  4. This earthquake M 2.5 about 170 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 47.3923, -113.0112. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis and Clark County, MT 56 km (35 mi) WNW of here earthquakes near Lewis and Clark County
Powell County, MT 61 km (38 mi) N of here earthquakes near Powell County
Teton County, MT 72 km (45 mi) SW of here earthquakes near Teton County
Missoula County, MT 78 km (48 mi) ENE of here earthquakes near Missoula County
Lake County, MT 85 km (53 mi) ESE of here earthquakes near Lake County
Pondera County, MT 110 km (68 mi) SSW of here earthquakes near Pondera County

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

Aftershocks so far

15 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. 1.5 26 km W of Augusta, Montana
  13. 2.3 34 km NE of Seeley Lake, Montana
  14. 1.8 20 km N of Ovando, Montana
  15. 2.2 43 km NNE 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.