QuakeIndex

mining explosion · reviewed by a seismologist

M 2.9ml

6 km E of Sleepy Hollow, Wyoming

· 0.0 km deep · released about 680 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Campbell County 15 kmCrook County 73 kmWeston County 76 kmJohnson County 101 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 2.9 (ml)
Depth
0.0 km below the surface
Felt
no reports yet
Nearest
Campbell County, 15 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 886 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 680 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 22,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 16,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.4× the energy of this one
  4. This earthquake M 2.9 about 680 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 44.2402, -105.3463. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Campbell County, WY 15 km (9 mi) ENE of here earthquakes near Campbell County
Crook County, WY 73 km (45 mi) WSW of here earthquakes near Crook County
Weston County, WY 76 km (47 mi) NW of here earthquakes near Weston County
Johnson County, WY 101 km (63 mi) ENE of here earthquakes near Johnson County

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

Aftershocks so far

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

  1. 3.1 13 km S of Antelope Valley-Crestview, Wyoming
  2. 3.1 15 km NE of Wright, Wyoming
  3. 3.2 11 km NE of Wright, Wyoming
  4. 3.0 13 km ENE of Wright, Wyoming
  5. 3.1 18 km NE of Wright, Wyoming
  6. 2.5 12 km NE of Sleepy Hollow, Wyoming
  7. 2.8 22 km SSE of Sleepy Hollow, Wyoming
  8. 3.3 15 km NE of Wright, Wyoming
  9. 3.1 23 km S of Antelope Valley-Crestview, Wyoming
  10. 2.6 12 km SSE of Antelope Valley-Crestview, Wyoming
  11. 3.2 14 km NE of Wright, Wyoming
  12. 3.1 27 km SSE of Antelope Valley-Crestview, Wyoming
  13. 3.0 17 km SSE of Antelope Valley-Crestview, Wyoming
  14. 3.2 15 km NE of Wright, Wyoming
  15. 3.1 13 km ENE of Wright, 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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