QuakeIndex

mining explosion · reviewed by a seismologist

M 2.8ml

20 km N of Gillette, Wyoming

· 0.0 km deep · released about 480 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Campbell County 31 kmCrook County 73 kmWeston County 100 kmJohnson County 101 kmPowder River County 104 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 2.8 (ml)
Depth
0.0 km below the surface
Felt
no reports yet
Nearest
Campbell County, 31 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2227 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 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 2× the energy of this one
  4. This earthquake M 2.8 about 480 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 44.4720, -105.4674. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Campbell County, WY 31 km (20 mi) N of here earthquakes near Campbell County
Crook County, WY 73 km (45 mi) W of here earthquakes near Crook County
Weston County, WY 100 km (62 mi) NW of here earthquakes near Weston County
Johnson County, WY 101 km (63 mi) ENE of here earthquakes near Johnson County
Powder River County, MT 104 km (65 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

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

  1. 2.9 20 km NNW of Gillette, Wyoming
  2. 2.7 5 km W of Gillette, Wyoming
  3. 2.9 16 km SSE of Antelope Valley-Crestview, Wyoming
  4. 2.8 6 km WNW of Gillette, Wyoming
  5. 3.0 6 km NW of Gillette, Wyoming
  6. 3.2 11 km NNE of Gillette, Wyoming
  7. 3.1 19 km SSE of Sleepy Hollow, Wyoming
  8. 2.6 3 km NNE of Antelope Valley-Crestview, Wyoming
  9. 2.5 9 km NNW of Gillette, Wyoming
  10. 2.0 8 km WNW of Gillette, Wyoming
  11. 3.3 20 km SSE of Antelope Valley-Crestview, Wyoming
  12. 2.9 19 km SSE of Sleepy Hollow, Wyoming
  13. 3.0 Wyoming
  14. 3.1 10 km SSE of Antelope Valley-Crestview, Wyoming
  15. 2.6 19 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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