QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

42 km ENE of Wisdom, Montana

· 5.0 km deep · released about 85 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Silver Bow County 29 kmDeer Lodge County 46 kmBeaverhead County 64 kmJefferson County 81 kmGranite County 86 kmMadison County 89 kmRavalli County 101 kmLemhi 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 2.3 (ml)
Depth
5.0 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
Silver Bow County, 29 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1182 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 11× the energy of this one
  4. This earthquake M 2.3 about 85 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 45.7060, -112.9211. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Silver Bow County, MT 29 km (18 mi) SW of here earthquakes near Silver Bow County
Deer Lodge County, MT 46 km (29 mi) SSE of here earthquakes near Deer Lodge County
Beaverhead County, MT 64 km (40 mi) N of here earthquakes near Beaverhead County
Jefferson County, MT 81 km (51 mi) SW of here earthquakes near Jefferson County
Granite County, MT 86 km (53 mi) SSE of here earthquakes near Granite County
Madison County, MT 89 km (55 mi) WNW of here earthquakes near Madison County

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

Aftershocks so far

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

  1. 2.0 5 km ENE of Butte, Montana
  2. 1.7 4 km E of Butte, Montana
  3. 1.7 4 km E of Butte, Montana
  4. 1.7 Western Montana
  5. 1.7 4 km E of Butte, Montana
  6. 1.9 4 km E of Butte, Montana
  7. 2.0 4 km E of Butte, Montana
  8. 1.7 Western Montana
  9. 1.8 Western Montana
  10. 1.5 14 km NNE of Dillon, Montana
  11. 1.8 4 km E of Butte, Montana
  12. 1.7 4 km E of Butte, Montana
  13. 1.6 4 km E of Butte, Montana
  14. 1.8 5 km E of Butte, Montana
  15. 1.7 28 km WNW of Dillon, 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.