Earthquake · reviewed by a seismologist
M 1.7ml
Earthquake near Richfield, UT
No earthquake was likely felt in Richfield in the 24 hours to 4:20 am MST (11:20 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 1.7 earthquake was recorded 8 km (5 mi) north of Richfield, UT, at 12:05 pm MDT on 31 August 2023 (18:05 UTC), 8.4 km deep.
USGS: 7 km N of Richfield, Utah
- When
- 12:05 pm MDT on 31 August 2023 ()
- Where
- 8 km (5 mi) north of Richfield, UT · earthquakes near Richfield
- Magnitude
- M 1.7 (ml)
- Depth
- 8.4 km below the surface
- Felt
- no reports yet
- Nearest
- Sevier County, 27 km ESE
- Nearest mapped fault
- Maple Grove faults, 18 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 1170 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 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 9 km (6 mi) from the epicentre. In Richfield, 8 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: Richfield 8 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
- Magna, Utah 2020 M 5.7 970,000× the energy of this one
- Around the size people start to feel M 3.0 86× the energy of this one
- This earthquake M 1.7 about 11 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 4.0 on 2019-02-20 — about 3,100 times the energy of this one.
Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:
- 6.6 Near Marysvale, Utah · 46 km SW of this epicentre
- 5.2 0 km SSW of Central Valley, Utah · 16 km S of this epicentre
- 5.2 25 km SE of Salina, Utah · 42 km E of this epicentre
- 5.0 10 km NE of Marysvale, Utah · 36 km S 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 38.8395, -112.1010. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Sevier County, UT | 27 km (17 mi) | ESE | earthquakes near Sevier County |
| Piute County, UT | 56 km (35 mi) | S | earthquakes near Piute County |
| Sanpete County, UT | 75 km (46 mi) | NE | earthquakes near Sanpete County |
| Millard County, UT | 90 km (56 mi) | W | earthquakes near Millard County |
| Beaver County, UT | 112 km (70 mi) | WSW | earthquakes near Beaver County |
| Juab County, UT | 114 km (71 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.
- 1.6 10 km WNW of Fayette, Utah
- 1.9 5 km NE of Koosharem, Utah
- 1.6 10 km NNW of Aurora, Utah
- 1.9 11 km NW of Aurora, Utah
- 1.6 22 km SW of Kanosh, Utah
- 1.8 9 km SW of Kanosh, Utah
- 1.8 8 km SSE of Joseph, Utah
- 1.9 23 km SSW of Kanosh, Utah
- 1.5 22 km SSW of Kanosh, Utah
- 2.0 21 km NW of Meadow, Utah
- 2.1 6 km SSE of Joseph, Utah
- 2.1 8 km SSE of Joseph, Utah
- 2.2 18 km WNW of Marysvale, Utah
- 1.8 14 km W of Kanosh, Utah
- 1.6 13 km SW of Kanosh, 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.