QuakeIndex

mining explosion · reviewed by a seismologist

M 3.0ml

18 km N of Gillette, Wyoming

· 0.0 km deep · released about 950 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Campbell County 29 kmCrook County 74 kmWeston County 99 kmJohnson County 100 kmPowder River County 106 kmSheridan County 117 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 3.0 (ml)
Depth
0.0 km below the surface
Felt
no reports yet
Nearest
Campbell County, 29 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2861 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 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 950 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 44.4542, -105.4756. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Campbell County, WY 29 km (18 mi) N of here earthquakes near Campbell County
Crook County, WY 74 km (46 mi) WSW of here earthquakes near Crook County
Weston County, WY 99 km (61 mi) NW of here earthquakes near Weston County
Johnson County, WY 100 km (62 mi) ENE of here earthquakes near Johnson County
Powder River County, MT 106 km (66 mi) S of here earthquakes near Powder River County
Sheridan County, WY 117 km (73 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

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

  1. 3.0 15 km SSE of Sleepy Hollow, Wyoming
  2. 2.7 3 km ENE of Gillette, Wyoming
  3. 2.8 13 km SSE of Antelope Valley-Crestview, Wyoming
  4. 3.2 7 km NNE of Gillette, Wyoming
  5. 2.8 13 km NE of Gillette, Wyoming
  6. 2.8 9 km ENE of Sleepy Hollow, Wyoming
  7. 2.3 2 km S of Antelope Valley-Crestview, Wyoming
  8. 2.9 8 km NE of Gillette, Wyoming
  9. 3.2 11 km SSW of Antelope Valley-Crestview, Wyoming
  10. 2.7 14 km SW of Moorcroft, Wyoming
  11. 3.1 19 km W of Gillette, Wyoming
  12. 3.0 22 km WNW of Gillette, Wyoming
  13. 2.8 21 km SSE of Sleepy Hollow, Wyoming
  14. 2.9 20 km SE of Sleepy Hollow, Wyoming
  15. 2.9 13 km NNW of Gillette, 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

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