QuakeIndex

mining explosion · reviewed by a seismologist

M 2.1ml

21 km NW of Gillette, Wyoming

· 0.0 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Campbell County 29 kmJohnson County 80 kmCrook County 93 kmSheridan County 101 kmWeston County 111 kmPowder River County 112 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 2.1 (ml)
Depth
0.0 km below the surface
Felt
no reports yet
Nearest
Campbell County, 29 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1583 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

USGS catalogues this as mining explosion, not an earthquake.

How big was it?

This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 44.4067, -105.7171. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Campbell County, WY 29 km (18 mi) NNW of here earthquakes near Campbell County
Johnson County, WY 80 km (50 mi) ENE of here earthquakes near Johnson County
Crook County, WY 93 km (58 mi) WSW of here earthquakes near Crook County
Sheridan County, WY 101 km (63 mi) ESE of here earthquakes near Sheridan County
Weston County, WY 111 km (69 mi) NW of here earthquakes near Weston County
Powder River County, MT 112 km (70 mi) S of here earthquakes near Powder River County

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

Aftershocks so far

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

  1. 2.9 6 km E of Sleepy Hollow, Wyoming
  2. 2.3 14 km NNW of Gillette, Wyoming
  3. 2.7 14 km N of Gillette, Wyoming
  4. 2.6 13 km SSE of Sleepy Hollow, Wyoming
  5. 2.6 23 km NE of Gillette, Wyoming
  6. 2.8 4 km SE of Antelope Valley-Crestview, Wyoming
  7. 2.7 8 km ENE of Sleepy Hollow, Wyoming
  8. 2.7 6 km SSE of Antelope Valley-Crestview, Wyoming
  9. 2.9 16 km N of Gillette, Wyoming
  10. 2.4 15 km NNW of Gillette, Wyoming
  11. 2.6 8 km S of Antelope Valley-Crestview, Wyoming
  12. 2.9 7 km N of Gillette, Wyoming
  13. 3.0 2 km S of Gillette, Wyoming
  14. 2.8 16 km SSE of Antelope Valley-Crestview, Wyoming
  15. 2.9 3 km SSE 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

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