QuakeIndex

mining explosion · reviewed by a seismologist

M 2.5ml

12 km NE of Sleepy Hollow, Wyoming

· 0.0 km deep · released about 170 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Campbell County 21 kmCrook County 67 kmWeston County 82 kmJohnson County 105 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 2.5 (ml)
Depth
0.0 km below the surface
Felt
no reports yet
Nearest
Campbell County, 21 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 390 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 170 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 89,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 63,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.6× the energy of this one
  4. This earthquake M 2.5 about 170 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 44.3324, -105.3367. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Campbell County, WY 21 km (13 mi) NE of here earthquakes near Campbell County
Crook County, WY 67 km (42 mi) WSW of here earthquakes near Crook County
Weston County, WY 82 km (51 mi) NW of here earthquakes near Weston County
Johnson County, WY 105 km (65 mi) ENE of here earthquakes near Johnson County
Powder River County, MT 121 km (75 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

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

  1. 3.4 18 km NNE of Wright, Wyoming
  2. 2.4 2 km WSW of Gillette, Wyoming
  3. 2.8 6 km SSE of Sleepy Hollow, Wyoming
  4. 3.1 15 km SSE of Antelope Valley-Crestview, Wyoming
  5. 3.1 22 km SSE of Antelope Valley-Crestview, Wyoming
  6. 2.5 13 km SE of Sleepy Hollow, Wyoming
  7. 3.1 9 km SSE of Antelope Valley-Crestview, Wyoming
  8. 3.2 18 km SSE of Antelope Valley-Crestview, Wyoming
  9. 2.7 19 km NNE of Gillette, Wyoming
  10. 2.6 30 km NE of Wright, Wyoming
  11. 2.8 21 km SSE of Sleepy Hollow, Wyoming
  12. 2.6 17 km NNE of Gillette, Wyoming
  13. 2.8 9 km NW of Gillette, Wyoming
  14. 3.2 17 km SSE of Antelope Valley-Crestview, Wyoming
  15. 2.6 16 km S 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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