QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

Earthquake near Saint George, UT

No earthquake was likely felt in Saint George in the 24 hours to 9:24 am MST (16:24 UTC). The last one was M 4.0, 95 km (59 mi) W, at 1:16 am MDT on 6 June 2025, estimated intensity II (weak) in town; 37 felt reports to USGS. Every earthquake near Saint George

This page: a magnitude 1.6 earthquake was recorded 47 km (29 mi) northwest of Saint George, UT, at 10:05 pm MDT on 11 September 2021 (04:05 UTC), 7.3 km deep.

USGS: 23 km WNW of Veyo, Utah

50 km (31 mi) NW of St. George, UT

10:05 pm MDT, Sep 11, 2021 · · 7.3 km deep · released about 6.4 lb of TNT

Every earthquake near Saint George Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Washington County 43 kmIron County 76 kmLincoln County 85 kmBeaver County 120 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
10:05 pm MDT on 11 September 2021 ()
Where
47 km (29 mi) northwest of Saint George, UT · earthquakes near Saint George
Magnitude
M 1.6 (md)
Depth
7.3 km below the surface
Felt
no reports yet
Nearest
Washington County, 43 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1887 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 8 km (5 mi) from the epicentre. In Saint George, 47 km away, the estimate is intensity I (not felt). 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.

Earthquakes near other towns within 30 km: Enterprise.

How big was it?

This earthquake released about 6.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
  3. Around the size people start to feel M 3.0 150× the energy of this one
  4. This earthquake M 1.6 about 6.4 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 4.2 on 2016-01-15 — about 11,000 times the energy of this one.

Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:

  1. 6.3 Near Pine Valley, Utah · 38 km E of this epicentre
  2. 5.9 38 km ESE of Caliente, Nevada · 19 km W of this epicentre
  3. 5.3 36 km SE of Caliente, Nevada · 24 km W of this epicentre
  4. 5.2 36 km SE of Caliente, Nevada · 24 km W 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 37.4303, -113.9290. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Washington County, UT 43 km (27 mi) ESE earthquakes near Washington County
Iron County, UT 76 km (47 mi) NE earthquakes near Iron County
Lincoln County, NV 85 km (53 mi) WNW earthquakes near Lincoln County
Beaver County, UT 120 km (74 mi) NNE earthquakes near Beaver County

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

Aftershocks so far

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

  1. 1.6 31 km W of Veyo, Utah
  2. 1.6 31 km W of Veyo, Utah
  3. 1.7 29 km W of Veyo, Utah
  4. 1.9 11 km ESE of Pine Valley, Utah
  5. 1.7 14 km NE of Beaver Dam, Arizona
  6. 1.7 13 km NE of Beaver Dam, Arizona
  7. 2.3 10 km N of Beaver Dam, Arizona
  8. 1.5 28 km W of Beryl Junction, Utah
  9. 1.6 10 km W of Ivins, Utah
  10. 1.5 34 km SSE of Caliente, Nevada
  11. 1.6 37 km SE of Caliente, Nevada
  12. 2.1 14 km NNE of Beaver Dam, Arizona
  13. 1.7 32 km WNW of Veyo, Utah
  14. 1.8 14 km NNE of Beaver Dam, Arizona
  15. 1.6 18 km WSW of Santa Clara, 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.