QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0md

4 km NNE of Magna, Utah

· 6.9 km deep · released about 16 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Salt Lake County 16 kmDavis County 34 kmMorgan County 57 kmWeber County 61 kmUtah County 78 kmWasatch County 90 kmTooele County 93 kmSummit County 95 kmCache County 113 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 4.0 (md)
Depth
6.9 km below the surface
Felt
13 reports · strongest reported intensity V
Measured shaking
intensity IV (ShakeMap)
USGS impact alert
green
Nearest
Salt Lake County, 16 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2356 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 13 people have reported feeling it to USGS.

How big was it?

This earthquake released about 16 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 11,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 480× the energy of this one
  3. Magna, Utah 2020 M 5.7 340× the energy of this one
  4. This earthquake M 4.0 about 16 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 33× 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 40.7475, -112.0802. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Salt Lake County, UT 16 km (10 mi) NW of here earthquakes near Salt Lake County
Davis County, UT 34 km (21 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 78 km (48 mi) NNW of here earthquakes near Utah County
Wasatch County, UT 90 km (56 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

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

  1. 2.0 6 km NNE of Magna, Utah
  2. 2.7 7 km NNE of Magna, Utah
  3. 3.0 5 km NNE of Magna, Utah
  4. 3.4 2 km NE of Magna, Utah
  5. 3.4 5 km NNE of Magna, Utah
  6. 2.3 6 km NNE of Magna, Utah
  7. 4.6 6 km NNE of Magna, Utah
  8. 1.8 7 km NNE of Magna, Utah
  9. 2.5 1 km NNE of Magna, Utah
  10. 1.7 8 km N of Magna, Utah
  11. 1.6 0 km SE of Magna, Utah
  12. 2.0 5 km NE of Magna, Utah
  13. 1.9 7 km NNE of Magna, Utah
  14. 2.3 1 km ESE of Magna, Utah
  15. 2.2 4 km NE 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 340 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.