QuakeIndex

mining explosion · reviewed by a seismologist

M 2.8ml

22 km SSE of Sleepy Hollow, 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 23 kmWeston County 62 kmCrook County 81 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 2.8 (ml)
Depth
0.0 km below the surface
Felt
no reports yet
Nearest
Campbell County, 23 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 255 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 44.0713, -105.2779. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Campbell County, WY 23 km (14 mi) SE of here earthquakes near Campbell County
Weston County, WY 62 km (38 mi) WNW of here earthquakes near Weston County
Crook County, WY 81 km (50 mi) SW of here earthquakes near Crook County
Johnson County, WY 105 km (65 mi) E of here earthquakes near Johnson County
Lawrence County, SD 121 km (75 mi) WSW of here earthquakes near Lawrence County
Niobrara County, WY 130 km (81 mi) NNW of here earthquakes near Niobrara 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. 3.2 12 km ENE of Wright, Wyoming
  2. 3.1 20 km ESE of Wright, Wyoming
  3. 3.1 13 km ESE of Wright, Wyoming
  4. 3.4 18 km SE of Wright, Wyoming
  5. 3.4 14 km ESE of Wright, Wyoming
  6. 3.7 13 km ESE of Wright, Wyoming
  7. 3.3 17 km NE of Wright, Wyoming
  8. 2.9 10 km ENE of Wright, Wyoming
  9. 3.4 10 km SE of Wright, Wyoming
  10. 3.3 18 km ESE of Wright, Wyoming
  11. 3.4 20 km SE of Wright, Wyoming
  12. 2.8 21 km SSE of Sleepy Hollow, Wyoming
  13. 3.3 12 km ENE of Wright, Wyoming
  14. 3.2 14 km ESE of Wright, Wyoming
  15. 2.6 17 km NNE 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.1 on 2023-01-23 — it released about 89 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.