QuakeIndex

quarry blast · reviewed by a seismologist

M 2.1ml

60 km W of Hooper, Utah

No: USGS classifies this as a quarry blast, not an earthquake. A magnitude 2.1 quarry blast was recorded 60 km W of Hooper, Utah, 82 km (51 mi) WNW of Salt Lake City, UT, at 10:55 am MDT on 18 August 2025 (16:55 UTC), less than 1 km deep.

82 km (51 mi) WNW of Salt Lake City, UT

· 0.0 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Davis County 53 kmBox Elder County 64 kmTooele County 72 kmWeber County 83 kmSalt Lake County 88 kmMorgan County 105 kmCache County 116 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 2.1 (ml)
Depth
0.0 km below the surface
Felt
no reports yet
Nearest
Davis County, 53 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 373 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 17 km (11 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

USGS catalogues this as quarry blast, not an earthquake.

How big was it?

This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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.

For this area

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 5.5 56 km SW of Howell, Utah · 50 km NNW of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 41.0723, -112.8279. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Davis County, UT 53 km (33 mi) E earthquakes near Davis County
Box Elder County, UT 64 km (40 mi) NNW earthquakes near Box Elder County
Tooele County, UT 72 km (45 mi) SSW earthquakes near Tooele County
Weber County, UT 83 km (51 mi) ENE earthquakes near Weber County
Salt Lake County, UT 88 km (55 mi) ESE earthquakes near Salt Lake County
Morgan County, UT 105 km (65 mi) E earthquakes near Morgan County

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

Aftershocks so far

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

  1. 2.3 66 km W of Hooper, Utah
  2. 1.7 64 km W of Hooper, Utah
  3. 2.2 65 km W of Hooper, Utah
  4. 1.7 62 km W of Hooper, Utah
  5. 1.9 64 km W of Hooper, Utah
  6. 1.5 53 km SW of Howell, Utah
  7. 1.8 53 km SW of Howell, Utah
  8. 1.9 53 km SW of Howell, Utah
  9. 2.0 53 km SW of Howell, Utah
  10. 1.7 52 km SW of Howell, Utah
  11. 2.0 67 km W of Hooper, Utah
  12. 2.2 69 km W of Hooper, Utah
  13. 2.1 61 km W of Hooper, Utah
  14. 1.6 67 km W of Hooper, Utah
  15. 1.8 63 km W of Hooper, 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.

On USGS

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