Earthquake · reviewed by a seismologist
M 3.6ml
Earthquake near Cedar City, UT
USGS: 8 km WNW of Hatch, Utah
- When
- 7:11 am MST on 28 February 2018 ()
- Where
- 47 km (29 mi) E of Cedar City, UT · earthquakes near Cedar City
- Magnitude
- M 3.6 (ml)
- Depth
- 11 km below the surface
- Felt
- 16 reports · strongest reported intensity IV
- Measured shaking
- intensity IV (ShakeMap)
- Nearest
- Iron County, 73 km WNW
- Nearest mapped fault
- Sevier/Toroweap fault, 15 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 1976 days ago
A magnitude 3.6 earthquake was recorded 47 km (29 mi) E of Cedar City, UT, at 7:11 am MST on 28 February 2018 (14:11 UTC). 16 people have reported feeling it to USGS. This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
Earthquakes near other towns within 30 km: Panguitch.
How big was it?
This earthquake released about 4.3 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.
- Northridge, California 1994 M 6.7 39,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 1,700× the energy of this one
- Magna, Utah 2020 M 5.7 1,200× the energy of this one
- This earthquake M 3.6 about 4.3 tons of TNT
- Around the size people start to feel M 3.0 this one released 9.1× 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 37.6702, -112.5307. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Iron County, UT | 73 km (45 mi) | WNW | earthquakes near Iron County |
| Kane County, UT | 77 km (48 mi) | SE | earthquakes near Kane County |
| Piute County, UT | 82 km (51 mi) | NNE | earthquakes near Piute County |
| Washington County, UT | 96 km (60 mi) | WSW | earthquakes near Washington County |
| Garfield County, UT | 97 km (60 mi) | E | earthquakes near Garfield County |
| Beaver County, UT | 98 km (61 mi) | NW | earthquakes near Beaver County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
51 earthquakes have been recorded within 50 km since this one.
- 2.5 15 km N of Panguitch, Utah
- 1.7 14 km N of Panguitch, UT
- 1.8 14 km N of Panguitch, Utah
- 2.6 25 km NW of Glendale, Utah
- 1.7 16 km NNW of Panguitch, Utah
- 1.6 16 km SE of Paragonah, Utah
- 2.1 9 km WNW of Panguitch, Utah
- 2.4 Utah
- 2.0 10 km NNE of Panguitch, Utah
- 1.8 6 km NW of Alton, Utah
- 1.8 10 km NNW of Alton, Utah
- 1.8 11 km NNW of Alton, UT
- 2.5 11 km NW of Alton, Utah
- 1.5 9 km NNW of Panguitch, Utah
- 1.8 20 km NNE of Paragonah, 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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.