QuakeIndex

mining explosion · reviewed by a seismologist

M 3.1ml

9 km NNW of Gillette, Wyoming

· 0.0 km deep · released about 1,300 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Campbell County 20 kmCrook County 81 kmJohnson County 91 kmWeston County 97 kmPowder River County 115 kmSheridan 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 3.1 (ml)
Depth
0.0 km below the surface
Felt
no reports yet
Nearest
Campbell County, 20 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 219 days ago

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

USGS catalogues this as mining explosion, not an earthquake.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× 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 44.3737, -105.5447. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Campbell County, WY 20 km (13 mi) N of here earthquakes near Campbell County
Crook County, WY 81 km (50 mi) WSW of here earthquakes near Crook County
Johnson County, WY 91 km (56 mi) ENE of here earthquakes near Johnson County
Weston County, WY 97 km (61 mi) NW of here earthquakes near Weston County
Powder River County, MT 115 km (72 mi) S of here earthquakes near Powder River County
Sheridan County, WY 115 km (72 mi) ESE of here earthquakes near Sheridan County

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

Aftershocks so far

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

  1. 2.4 2 km WSW of Gillette, Wyoming
  2. 2.8 6 km SSE of Sleepy Hollow, Wyoming
  3. 3.1 15 km SSE of Antelope Valley-Crestview, Wyoming
  4. 3.1 22 km SSE of Antelope Valley-Crestview, Wyoming
  5. 2.5 13 km SE of Sleepy Hollow, Wyoming
  6. 3.1 9 km SSE of Antelope Valley-Crestview, Wyoming
  7. 3.2 18 km SSE of Antelope Valley-Crestview, Wyoming
  8. 2.7 19 km NNE of Gillette, Wyoming
  9. 2.8 21 km SSE of Sleepy Hollow, Wyoming
  10. 2.6 17 km NNE of Gillette, Wyoming
  11. 2.8 9 km NW of Gillette, Wyoming
  12. 3.2 17 km SSE of Antelope Valley-Crestview, Wyoming
  13. 2.6 16 km S of Antelope Valley-Crestview, Wyoming
  14. 2.5 3 km NNE of Gillette, Wyoming
  15. 3.1 7 km SE of Antelope Valley-Crestview, Wyoming

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.