QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

26 km SW of Boulder Flats, Wyoming

· 5.0 km deep · released about 1,300 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fremont County 48 kmSublette County 69 kmHot Springs County 117 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 3.1 (ml)
Depth
5.0 km below the surface
Felt
no reports yet
Nearest
Fremont County, 48 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2837 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× 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 42.7782, -109.0654. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fremont County, WY 48 km (30 mi) SW of here earthquakes near Fremont County
Sublette County, WY 69 km (43 mi) E of here earthquakes near Sublette County
Hot Springs County, WY 117 km (72 mi) SSW of here earthquakes near Hot Springs County

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

Aftershocks so far

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

  1. 2.9 25 km SW of Fort Washakie, Wyoming
  2. 2.5 14 km W of Atlantic City, Wyoming
  3. 2.7 26 km WSW of Lander, Wyoming
  4. 3.1 29 km NE of Boulder, Wyoming
  5. 1.8 35 km SSW of Crowheart, 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.