Earthquake · reviewed by a seismologist
M 4.0ml
Earthquake near Richfield, UT
No earthquake was likely felt in Richfield in the 24 hours to 7:29 pm MST (02:29 UTC). The last one was M 3.2, 34 km (21 mi) W, at 8:35 am MDT on 22 April 2026, estimated intensity II (weak) in town; 6 felt reports to USGS. Every earthquake near Richfield
This page: a magnitude 4.0 earthquake was recorded 36 km (22 mi) west of Richfield, UT, at 12:05 am MST on 20 February 2019 (07:05 UTC), 8.2 km deep. 85 people have reported feeling it to USGS.
USGS: 8 km SW of Kanosh, Utah
- When
- 12:05 am MST on 20 February 2019 ()
- Where
- 36 km (22 mi) west of Richfield, UT · earthquakes near Richfield
- Magnitude
- M 4.0 (ml)
- Depth
- 8.2 km below the surface
- Felt
- 85 reports · strongest reported intensity IV
- Measured shaking
- intensity IV (ShakeMap)
- USGS impact alert
- green
- Nearest
- Piute County, 55 km SE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2017 days ago
Earthquake alerts for Richfield, UT
Get a notification in this browser when USGS records an earthquake near Richfield, UT. No account or email needed.
Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.
At this magnitude and depth, people at rest would likely notice it out to about 100 km (62 mi) from the epicentre. In Richfield, 36 km away, the estimate is intensity III (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: Fillmore 30 km, intensity III · Monroe 35 km, intensity III · Richfield 36 km, intensity III. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 17 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 9,800× the energy of this one
- Mineral, Virginia 2011 M 5.8 440× the energy of this one
- Magna, Utah 2020 M 5.7 310× the energy of this one
- This earthquake M 4.0 about 17 tons of TNT
- Around the size people start to feel M 3.0 this one released 36× 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
The largest earthquake within 50 km (31 mi) since our catalogue begins in 2016. No other earthquake of M4 or more has been recorded this close in that time.
Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:
- 6.6 Near Marysvale, Utah · 28 km SSE of this epicentre
- 5.2 0 km SSW of Central Valley, Utah · 35 km E of this epicentre
- 5.0 10 km NE of Marysvale, Utah · 40 km SE 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 38.7375, -112.4965. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Piute County, UT | 55 km (34 mi) | SE | earthquakes near Piute County |
| Sevier County, UT | 59 km (37 mi) | E | earthquakes near Sevier County |
| Millard County, UT | 60 km (37 mi) | WNW | earthquakes near Millard County |
| Beaver County, UT | 77 km (48 mi) | WSW | earthquakes near Beaver County |
| Sanpete County, UT | 106 km (66 mi) | NE | earthquakes near Sanpete County |
| Juab County, UT | 112 km (69 mi) | NNW | earthquakes near Juab County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
53 earthquakes have been recorded within 50 km since this one.
- 1.9 19 km ENE of Milford, Utah
- 1.7 10 km S of Marysvale, Utah
- 1.8 5 km WNW of Sigurd, Utah
- 2.3 6 km SSE of Joseph, Utah
- 1.7 6 km SSE of Joseph, Utah
- 1.6 14 km SW of Kanosh, Utah
- 1.6 8 km WNW of Sigurd, Utah
- 1.6 6 km S of Joseph, Utah
- 2.0 25 km SSW of Kanosh, Utah
- 1.5 17 km NE of Milford, Utah
- 1.8 8 km ENE of Marysvale, Utah
- 2.4 5 km SW of Joseph, Utah
- 2.6 9 km WNW of Sigurd, Utah
- 1.9 5 km SW of Joseph, Utah
- 1.7 5 km SW of Joseph, 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.