QuakeIndex

Earthquake · reviewed by a seismologist

M 4.2ml

4 km NE of Magna, Utah

· 9.5 km deep · released about 29 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Salt Lake County 14 kmDavis County 36 kmMorgan County 57 kmWeber County 61 kmUtah County 76 kmWasatch County 88 kmSummit County 93 kmTooele County 94 kmCache County 114 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 4.2 (ml)
Depth
9.5 km below the surface
Felt
6730 reports · strongest reported intensity V
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Nearest
Salt Lake County, 14 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 672 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 6730 people have reported feeling it to USGS.

How big was it?

This earthquake released about 29 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 5,800× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 260× the energy of this one
  3. Magna, Utah 2020 M 5.7 180× the energy of this one
  4. This earthquake M 4.2 about 29 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 61× 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 40.7358, -112.0622. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Salt Lake County, UT 14 km (9 mi) WNW of here earthquakes near Salt Lake County
Davis County, UT 36 km (22 mi) SSE of here earthquakes near Davis County
Morgan County, UT 57 km (35 mi) SW of here earthquakes near Morgan County
Weber County, UT 61 km (38 mi) SSW of here earthquakes near Weber County
Utah County, UT 76 km (47 mi) NNW of here earthquakes near Utah County
Wasatch County, UT 88 km (55 mi) WNW of here earthquakes near Wasatch 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. 1.6 3 km NE of Magna, Utah
  2. 1.9 5 km ENE of Magna, Utah
  3. 2.3 5 km NNW of West Valley City, Utah
  4. 1.9 5 km NE of Magna, Utah
  5. 2.0 4 km ENE of Magna, Utah
  6. 1.9 4 km NE of Magna, Utah
  7. 1.8 4 km NE of Magna, Utah
  8. 1.7 4 km NNW of West Valley City, Utah
  9. 2.5 4 km ENE of Magna, UT
  10. 1.9 6 km NNE of Magna, UT
  11. 2.1 5 km NNE of Magna, Utah
  12. 1.8 4 km ENE of Magna, Utah
  13. 1.7 4 km E of Magna, Utah
  14. 1.5 4 km E of Magna, Utah
  15. 2.3 4 km E of Magna, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 5.7 on 2020-03-18 — it released about 180 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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