QuakeIndex

quarry blast · reviewed by a seismologist

M 2.2ml

69 km W of Hooper, Utah

No: USGS classifies this as a quarry blast, not an earthquake. A magnitude 2.2 quarry blast was recorded 69 km W of Hooper, Utah, 94 km (58 mi) WNW of Salt Lake City, UT, at 11:10 am MDT on 29 September 2025 (17:10 UTC), less than 1 km deep.

94 km (58 mi) WNW of Salt Lake City, UT

· 0.0 km deep · released about 60 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Box Elder County 57 kmDavis County 63 kmTooele County 74 kmWeber County 91 kmSalt Lake County 100 kmMorgan County 115 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 2.2 (ml)
Depth
0.0 km below the surface
Felt
no reports yet
Nearest
Box Elder County, 57 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 336 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 18 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 60 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 250,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 180,000× the energy of this one
  3. Around the size people start to feel M 3.0 16× the energy of this one
  4. This earthquake M 2.2 about 60 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 · 42 km N 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 41.1212, -112.9493. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Box Elder County, UT 57 km (35 mi) N earthquakes near Box Elder County
Davis County, UT 63 km (39 mi) E earthquakes near Davis County
Tooele County, UT 74 km (46 mi) SSW earthquakes near Tooele County
Weber County, UT 91 km (57 mi) E earthquakes near Weber County
Salt Lake County, UT 100 km (62 mi) ESE earthquakes near Salt Lake County
Morgan County, UT 115 km (71 mi) E earthquakes near Morgan County

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

Aftershocks so far

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

  1. 1.6 49 km SSW of Snowville, Utah
  2. 2.3 66 km W of Hooper, Utah
  3. 1.7 64 km W of Hooper, Utah
  4. 2.2 65 km W of Hooper, Utah
  5. 1.7 62 km W of Hooper, Utah
  6. 1.9 64 km W of Hooper, Utah
  7. 1.5 53 km SW of Howell, Utah
  8. 1.8 53 km SW of Howell, Utah
  9. 1.9 53 km SW of Howell, Utah
  10. 2.0 53 km SW of Howell, Utah
  11. 1.7 52 km SW of Howell, Utah
  12. 2.0 67 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.