QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

Earthquake near Cedar City, UT

No earthquake was likely felt in Cedar City in the 24 hours to 11:28 pm MST (06:28 UTC). The last one was M 2.2, 16 km (10 mi) N, at 10:46 am MST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Cedar City

This page: a magnitude 2.3 earthquake was recorded 17 km (11 mi) northwest of Cedar City, UT, at 3:43 am MDT on 12 August 2024 (09:43 UTC), 4.2 km deep. 1 person has reported feeling it to USGS.

USGS: 16 km NW of Cedar City, Utah

83 km (51 mi) NNE of St. George, UT

3:43 am MDT, Aug 12, 2024 · · 4.2 km deep · released about 77 lb of TNT

Every earthquake near Cedar City Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Iron County 18 kmWashington County 61 kmBeaver County 66 kmPiute County 115 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
3:43 am MDT on 12 August 2024 ()
Where
17 km (11 mi) northwest of Cedar City, UT · earthquakes near Cedar City
Magnitude
M 2.3 (ml)
Depth
4.2 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
Iron County, 18 km NNW
Nearest mapped fault
Enoch graben faults, 16 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 823 days ago

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

At this magnitude and depth, people at rest would likely notice it out to about 19 km (12 mi) from the epicentre. In Cedar City, 17 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Likely felt in: Cedar City 17 km, intensity II · Enoch 17 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 77 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 140,000× the energy of this one
  3. Around the size people start to feel M 3.0 12× the energy of this one
  4. This earthquake M 2.3 about 77 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.

For this area

The largest earthquake within 50 km since 2016 was M 4.5 on 2024-07-29 — about 2,000 times the energy of this one.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 6.3 Near Pine Valley, Utah · 48 km SSW of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 37.7648, -113.2193. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Iron County, UT 18 km (11 mi) NNW earthquakes near Iron County
Washington County, UT 61 km (38 mi) SSW earthquakes near Washington County
Beaver County, UT 66 km (41 mi) N earthquakes near Beaver County
Piute County, UT 115 km (71 mi) NE earthquakes near Piute County

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

Aftershocks so far

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

  1. 1.6 5 km WSW of Cedar City, Utah
  2. 1.7 13 km WNW of Enoch, Utah
  3. 2.0 9 km SW of New Harmony, Utah
  4. 2.4 9 km SW of New Harmony, Utah
  5. 1.6 9 km SW of New Harmony, Utah
  6. 2.2 9 km SW of New Harmony, Utah
  7. 2.3 9 km SW of New Harmony, Utah
  8. 1.6 7 km SW of New Harmony, Utah
  9. 1.7 11 km E of Kanarraville, Utah
  10. 2.2 11 km ENE of Kanarraville, Utah
  11. 1.9 9 km ESE of Kanarraville, Utah
  12. 1.9 11 km ENE of Kanarraville, Utah
  13. 1.7 11 km ENE of Kanarraville, Utah
  14. 2.3 11 km ENE of Kanarraville, Utah
  15. 1.5 1 km NE of Summit, 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.