Earthquake · reviewed by a seismologist
M 1.6ml
Earthquake near Monroe, UT
No earthquake was likely felt in Monroe in the 24 hours to 12:42 am MST (07:42 UTC). The last one was M 3.3, 41 km (25 mi) SSW, at 10:44 pm MDT on 30 October 2026, estimated intensity II (weak) in town; 5 felt reports to USGS. Every earthquake near Monroe
This page: a magnitude 1.6 earthquake was recorded 16 km (10 mi) southwest of Monroe, UT, at 5:03 pm MDT on 20 October 2021 (23:03 UTC), less than 1 km deep.
USGS: 7 km N of Marysvale, Utah
- When
- 5:03 pm MDT on 20 October 2021 ()
- Where
- 16 km (10 mi) southwest of Monroe, UT · earthquakes near Monroe
- Magnitude
- M 1.6 (ml)
- Depth
- 0.9 km below the surface
- Felt
- no reports yet
- Nearest
- Piute County, 23 km SSE
- Nearest mapped fault
- Annabella graben faults, 22 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 1849 days ago
Earthquake alerts for Monroe, UT
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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 11 km (7 mi) from the epicentre. In Monroe, 16 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.
How big was it?
This earthquake released about 7.1 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,100,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,500,000× the energy of this one
- Around the size people start to feel M 3.0 130× the energy of this one
- This earthquake M 1.6 about 7.1 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 4,900 times the energy of this one.
Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:
- 6.6 Near Marysvale, Utah · 14 km W of this epicentre
- 5.2 0 km SSW of Central Valley, Utah · 23 km NNE of this epicentre
- 5.0 10 km NE of Marysvale, Utah · 9 km E 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 38.5200, -112.2408. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Piute County, UT | 23 km (14 mi) | SSE | earthquakes near Piute County |
| Sevier County, UT | 45 km (28 mi) | NE | earthquakes near Sevier County |
| Beaver County, UT | 89 km (55 mi) | WSW | earthquakes near Beaver County |
| Millard County, UT | 91 km (57 mi) | WNW | earthquakes near Millard County |
| Garfield County, UT | 103 km (64 mi) | SE | earthquakes near Garfield County |
| Sanpete County, UT | 111 km (69 mi) | NNE | earthquakes near Sanpete County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
50 earthquakes have been recorded within 50 km since this one.
- 1.5 7 km SE of Beaver, Utah
- 1.8 27 km NE of Milford, Utah
- 1.6 12 km SSW of Marysvale, Utah
- 1.7 3 km ESE of Beaver, Utah
- 1.9 8 km WNW of Circleville, Utah
- 2.0 9 km WNW of Circleville, Utah
- 1.7 9 km SE of Marysvale, Utah
- 2.4 3 km NNW of Joseph, Utah
- 1.5 24 km SSW of Kanosh, Utah
- 1.6 2 km SW of Junction, Utah
- 1.5 6 km S of Joseph, Utah
- 1.9 1 km WSW of Junction, Utah
- 3.4 4 km S of Joseph, Utah
- 1.6 7 km SSE of Joseph, Utah
- 2.2 4 km S 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.