QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9ml

16 km SW of Thatcher, Utah

· 6.2 km deep · released about 12 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Box Elder County 54 kmWeber County 57 kmCache County 59 kmDavis County 63 kmOneida County 68 kmFranklin County 83 kmMorgan County 89 kmRich County 98 kmSalt Lake County 109 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 3.9 (ml)
Depth
6.2 km below the surface
Felt
94 reports · strongest reported intensity V
Measured shaking
intensity IV (ShakeMap)
USGS impact alert
green
Nearest
Box Elder County, 54 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 800 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 94 people have reported feeling it to USGS.

How big was it?

This earthquake released about 12 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 14,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 640× the energy of this one
  3. Magna, Utah 2020 M 5.7 450× the energy of this one
  4. This earthquake M 3.9 about 12 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 25× 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 41.5768, -112.4187. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Box Elder County, UT 54 km (33 mi) E of here earthquakes near Box Elder County
Weber County, UT 57 km (35 mi) NW of here earthquakes near Weber County
Cache County, UT 59 km (36 mi) WSW of here earthquakes near Cache County
Davis County, UT 63 km (39 mi) NNW of here earthquakes near Davis County
Oneida County, ID 68 km (42 mi) S of here earthquakes near Oneida County
Franklin County, ID 83 km (51 mi) SW of here earthquakes near Franklin County

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

Aftershocks so far

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

  1. 1.8 17 km SW of Thatcher, Utah
  2. 1.6 16 km SW of Thatcher, Utah
  3. 1.8 14 km SW of Thatcher, Utah
  4. 1.9 6 km SSW of Thatcher, Utah
  5. 3.1 5 km SSW of Thatcher, Utah
  6. 2.0 16 km SW of Thatcher, Utah
  7. 1.5 17 km SW of Thatcher, Utah
  8. 1.9 16 km SW of Thatcher, Utah
  9. 1.7 16 km SW of Thatcher, Utah
  10. 2.2 17 km SW of Thatcher, Utah
  11. 1.5 17 km SW of Thatcher, Utah
  12. 1.9 15 km SW of Thatcher, Utah
  13. 2.0 15 km SW of Thatcher, Utah
  14. 1.8 17 km SW of Thatcher, Utah
  15. 1.9 14 km SW of Thatcher, 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.