QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

Earthquake near Cedar City, UT

No earthquake was likely felt in Cedar City in the 24 hours to 3:08 am MST (10:08 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 2.1 earthquake was recorded 50 km (31 mi) southeast of Cedar City, UT, at 1:14 pm MDT on 21 March 2021 (19:14 UTC), 5.5 km deep.

USGS: 10 km WSW of Alton, Utah

94 km (58 mi) ENE of St. George, UT

1:14 pm MDT, Mar 21, 2021 · · 5.5 km deep · released about 41 lb of TNT

Every earthquake near Cedar City Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kane County 71 kmWashington County 80 kmIron County 83 kmPiute County 110 kmGarfield County 111 kmBeaver County 118 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
1:14 pm MDT on 21 March 2021 ()
Where
50 km (31 mi) southeast of Cedar City, UT · earthquakes near Cedar City
Magnitude
M 2.1 (md)
Depth
5.5 km below the surface
Felt
no reports yet
Nearest
Kane County, 71 km ESE
Nearest mapped fault
Sevier/Toroweap fault, 7 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 2062 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 16 km (10 mi) from the epicentre. In Cedar City, 50 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.

How big was it?

This earthquake released about 41 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 370,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 260,000× the energy of this one
  3. Around the size people start to feel M 3.0 23× the energy of this one
  4. This earthquake M 2.1 about 41 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

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 37.4182, -112.6037. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Kane County, UT 71 km (44 mi) ESE earthquakes near Kane County
Washington County, UT 80 km (50 mi) WSW earthquakes near Washington County
Iron County, UT 83 km (51 mi) NW earthquakes near Iron County
Piute County, UT 110 km (68 mi) NNE earthquakes near Piute County
Garfield County, UT 111 km (69 mi) ENE earthquakes near Garfield County
Beaver County, UT 118 km (74 mi) NNW earthquakes near Beaver County

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

Aftershocks so far

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

  1. 1.7 21 km ESE of Kanarraville, Utah
  2. 2.6 19 km ESE of Kanarraville, Utah
  3. 1.9 21 km ESE of Kanarraville, Utah
  4. 2.1 20 km SE of Kanarraville, Utah
  5. 2.0 19 km SE of Kanarraville, Utah
  6. 2.3 19 km SE of Kanarraville, Utah
  7. 2.4 19 km SE of Kanarraville, Utah
  8. 1.6 20 km SE of Kanarraville, Utah
  9. 2.8 22 km ESE of Kanarraville, Utah
  10. 2.1 22 km SE of Kanarraville, Utah
  11. 3.6 9 km E of Springdale, Utah
  12. 2.5 22 km ESE of Kanarraville, Utah
  13. 1.7 22 km ESE of Kanarraville, Utah
  14. 1.9 22 km ESE of Kanarraville, Utah
  15. 1.6 20 km SE of Kanarraville, 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.