QuakeIndex

mining explosion · reviewed by a seismologist

M 3.1ml

20 km NNE of Maeser, Utah

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

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Daggett County 29 kmUintah County 57 kmDuchesne County 91 kmMoffat County 105 kmUinta 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
0.0 km below the surface
Felt
no reports yet
Nearest
Daggett County, 29 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 162 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 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 40.6336, -109.4578. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Daggett County, UT 29 km (18 mi) S of here earthquakes near Daggett County
Uintah County, UT 57 km (35 mi) N of here earthquakes near Uintah County
Duchesne County, UT 91 km (56 mi) ENE of here earthquakes near Duchesne County
Moffat County, CO 105 km (65 mi) W of here earthquakes near Moffat County
Uinta County, WY 117 km (73 mi) SE of here earthquakes near Uinta County
Sweetwater County, WY 124 km (77 mi) SSW of here earthquakes near Sweetwater County

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

Aftershocks so far

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

  1. 3.1 24 km NNE of Maeser, Utah
  2. 3.1 18 km NNE of Maeser, Utah
  3. 3.3 16 km NNE of Maeser, Utah
  4. 1.9 12 km SSW of Jensen, Utah
  5. 3.0 21 km NNE of Maeser, Utah
  6. 3.1 20 km NNE of Maeser, Utah
  7. 3.4 22 km NNE of Vernal, Utah
  8. 3.2 18 km NNE of Maeser, Utah

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 2025-09-10 — it released about 35 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.