QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3ml

23 km SW of Woodruff, Utah

· -3.4 km deep · released about 1.2 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Rich County 32 kmMorgan County 37 kmWeber County 49 kmCache County 57 kmSummit County 59 kmUinta County 62 kmDavis County 83 kmSalt Lake County 92 kmFranklin County 102 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 3.3 (ml)
Depth
-3.4 km below the surface
Felt
2 reports · strongest reported intensity I
Measured shaking
intensity II (ShakeMap)
Nearest
Rich County, 32 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 969 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 140,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 6,500× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,600× the energy of this one
  4. This earthquake M 3.3 about 1.2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.5× 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 41.3447, -111.2982. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Rich County, UT 32 km (20 mi) S of here earthquakes near Rich County
Morgan County, UT 37 km (23 mi) NE of here earthquakes near Morgan County
Weber County, UT 49 km (30 mi) E of here earthquakes near Weber County
Cache County, UT 57 km (35 mi) SE of here earthquakes near Cache County
Summit County, UT 59 km (37 mi) NNW of here earthquakes near Summit County
Uinta County, WY 62 km (39 mi) W of here earthquakes near Uinta County

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

Aftershocks so far

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

  1. 1.7 8 km SSW of Randolph, Utah
  2. 2.1 8 km SSW of Randolph, Utah
  3. 1.9 14 km ENE of Huntsville, Utah
  4. 1.6 15 km E of Providence, Utah
  5. 1.6 13 km ESE of Millville, Utah
  6. 1.9 16 km E of Providence, Utah
  7. 2.0 12 km E of Millville, Utah
  8. 2.6 12 km E of Millville, Utah
  9. 1.5 9 km ENE of Avon, Utah
  10. 2.1 3 km WNW of Huntsville, Utah
  11. 1.5 10 km ENE of Mountain Green, Utah
  12. 1.6 18 km N of Henefer, Utah
  13. 1.7 2 km ESE of Echo, Utah
  14. 3.3 13 km E of Huntsville, Utah
  15. 1.5 8 km E of Avon, 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.