QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

4 km NNW of Henefer, Utah

· 12 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Morgan County 6 kmWeber County 38 kmSummit County 51 kmSalt Lake County 54 kmDavis County 57 kmRich County 69 kmCache County 78 kmUinta County 85 kmWasatch County 85 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 1.8 (ml)
Depth
12 km below the surface
Felt
no reports yet
Nearest
Morgan County, 6 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1731 days ago

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

How big was it?

This earthquake released about 13 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 810,000× the energy of this one
  3. Around the size people start to feel M 3.0 72× the energy of this one
  4. This earthquake M 1.8 about 13 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.

Where

Epicentre 41.0493, -111.5270. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Morgan County, UT 6 km (4 mi) SE of here earthquakes near Morgan County
Weber County, UT 38 km (24 mi) SE of here earthquakes near Weber County
Summit County, UT 51 km (32 mi) WNW of here earthquakes near Summit County
Salt Lake County, UT 54 km (34 mi) NE of here earthquakes near Salt Lake County
Davis County, UT 57 km (35 mi) E of here earthquakes near Davis County
Rich County, UT 69 km (43 mi) SSW of here earthquakes near Rich County

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

Aftershocks so far

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

  1. 1.6 9 km S of Morgan, Utah
  2. 1.6 2 km SE of North Salt Lake, Utah
  3. 1.8 12 km ENE of Wolf Creek, Utah
  4. 2.6 15 km NNW of Summit Park, Utah
  5. 1.7 14 km N of Henefer, Utah
  6. 1.6 13 km SSE of Morgan, Utah
  7. 1.9 25 km SW of Evanston, Wyoming
  8. 1.6 8 km NE of Morgan, Utah
  9. 1.8 7 km NE of Morgan, Utah
  10. 2.3 5 km ENE of Huntsville, Utah
  11. 2.4 11 km ENE of Huntsville, Utah
  12. 1.7 28 km WSW of Bear River, Wyoming
  13. 2.0 12 km WSW of Echo, Utah
  14. 2.0 6 km E of Silver Summit, Utah
  15. 2.3 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.