QuakeIndex

mining explosion · reviewed by a seismologist

M 2.9ml

32 km NW of Lance Creek, Wyoming

· 0.0 km deep · released about 680 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Niobrara County 43 kmConverse County 53 kmWeston County 77 kmFall River County 117 kmCampbell County 118 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
Niobrara County, 43 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2712 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 43.2165, -104.9531. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Niobrara County, WY 43 km (27 mi) WNW of here earthquakes near Niobrara County
Converse County, WY 53 km (33 mi) ENE of here earthquakes near Converse County
Weston County, WY 77 km (48 mi) SSW of here earthquakes near Weston County
Fall River County, SD 117 km (73 mi) W of here earthquakes near Fall River County
Campbell County, WY 118 km (73 mi) SSE of here earthquakes near Campbell County
Sioux County, NE 130 km (81 mi) NW of here earthquakes near Sioux County

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

Aftershocks so far

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

  1. 3.3 31 km SE of Wright, Wyoming
  2. 3.4 27 km SE of Wright, Wyoming
  3. 3.2 27 km SE of Wright, Wyoming
  4. 2.8 27 km SSE of Wright, Wyoming
  5. 3.3 28 km SE of Wright, Wyoming
  6. 3.2 35 km SE of Wright, Wyoming
  7. 3.0 24 km SE of Wright, Wyoming
  8. 3.3 28 km SE of Wright, Wyoming
  9. 2.8 30 km SE of Wright, Wyoming
  10. 3.2 33 km SSE of Wright, Wyoming
  11. 3.3 25 km SE of Wright, Wyoming
  12. 3.0 29 km SE of Wright, Wyoming
  13. 3.3 33 km SSE of Wright, Wyoming
  14. 3.1 35 km SE of Wright, Wyoming
  15. 3.2 28 km SE 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

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