QuakeIndex

mining explosion · reviewed by a seismologist

M 3.7ml

26 km NNE of Gillette, Wyoming

· 0.0 km deep · released about 5.4 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Campbell County 37 kmCrook County 64 kmWeston County 97 kmPowder River County 101 kmJohnson County 110 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 3.7 (ml)
Depth
0.0 km below the surface
Felt
no reports yet
Nearest
Campbell County, 37 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2621 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 5.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 32,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,000× the energy of this one
  4. This earthquake M 3.7 about 5.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 11× 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 44.5073, -105.3670. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Campbell County, WY 37 km (23 mi) NNE of here earthquakes near Campbell County
Crook County, WY 64 km (40 mi) W of here earthquakes near Crook County
Weston County, WY 97 km (60 mi) NW of here earthquakes near Weston County
Powder River County, MT 101 km (63 mi) S of here earthquakes near Powder River County
Johnson County, WY 110 km (68 mi) ENE of here earthquakes near Johnson County
Carter County, MT 131 km (81 mi) SSW of here earthquakes near Carter 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. 2.7 5 km W of Gillette, Wyoming
  2. 2.9 16 km SSE of Antelope Valley-Crestview, Wyoming
  3. 2.8 6 km WNW of Gillette, Wyoming
  4. 3.0 6 km NW of Gillette, Wyoming
  5. 3.2 11 km NNE of Gillette, Wyoming
  6. 3.1 19 km SSE of Sleepy Hollow, Wyoming
  7. 2.6 3 km NNE of Antelope Valley-Crestview, Wyoming
  8. 2.5 9 km NNW of Gillette, Wyoming
  9. 2.0 8 km WNW of Gillette, Wyoming
  10. 2.9 19 km SSE of Sleepy Hollow, Wyoming
  11. 3.1 10 km SSE of Antelope Valley-Crestview, Wyoming
  12. 2.4 33 km NNW of Gillette, Wyoming
  13. 2.2 9 km S of Antelope Valley-Crestview, Wyoming
  14. 3.0 22 km N of Gillette, Wyoming
  15. 2.8 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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