QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6ml

Earthquake near Hurricane, UT

No earthquake was likely felt in Hurricane in the 24 hours to 7:04 am MST (14:04 UTC). The last one was M 2.4, 17 km (10 mi) NW, at 11:59 pm MST on 5 March 2026, estimated intensity II (weak) in town. Every earthquake near Hurricane

This page: a magnitude 3.6 earthquake was recorded 35 km (22 mi) east of Hurricane, UT, at 3:36 pm MST on 21 December 2021 (22:36 UTC), 20 km deep. 161 people have reported feeling it to USGS.

USGS: 9 km E of Springdale, Utah

62 km (38 mi) ENE of St. George, UT

3:36 pm MST, Dec 21, 2021 · · 20 km deep · released about 4.1 tons of TNT

Every earthquake near Hurricane Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Washington County 53 kmIron County 88 kmKane County 96 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
3:36 pm MST on 21 December 2021 ()
Where
35 km (22 mi) east of Hurricane, UT · earthquakes near Hurricane
Magnitude
M 3.6 (ml)
Depth
20 km below the surface
Felt
161 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Nearest
Washington County, 53 km W
Nearest mapped fault
Sevier/Toroweap fault, 20 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 1717 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 68 km (42 mi) from the epicentre. In Hurricane, 35 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: Colorado City 23 km, intensity III · Hurricane 35 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 4.1 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 42,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,900× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,300× the energy of this one
  4. This earthquake M 3.6 about 4.1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 8.5× 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.

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 37.1905, -112.8938. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Washington County, UT 53 km (33 mi) W earthquakes near Washington County
Iron County, UT 88 km (55 mi) NNW earthquakes near Iron County
Kane County, UT 96 km (60 mi) E earthquakes near Kane County

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

Aftershocks so far

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

  1. 1.8 2 km ESE of Colorado City, Arizona
  2. 2.1 2 km ESE of Colorado City, Arizona
  3. 1.6 2 km ESE of Hildale, Utah
  4. 3.8 3 km ESE of Colorado City, Arizona
  5. 2.3 10 km SW of Centennial Park, Arizona
  6. 1.8 10 km SSE of Cedar City, Utah
  7. 1.8 6 km SE of Fredonia, Arizona
  8. 1.9 10 km ENE of Kanarraville, Utah
  9. 2.1 5 km NNW of Hildale, Utah
  10. 2.1 1 km N of Cane Beds, Arizona
  11. 1.5 3 km NW of Leeds, Utah
  12. 2.0 12 km ENE of Springdale, Utah
  13. 1.9 11 km E of Kanarraville, Utah
  14. 1.8 9 km ENE of Hildale, Utah
  15. 1.6 20 km S of Centennial Park, Arizona

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.