Earthquake near Tremonton, UT

No earthquake was likely felt in Tremonton in the 24 hours to 6:57 pm MST (01:57 UTC). The last one was M 4.7, 140 km (87 mi) SE, at 7:49 am MST on 22 January 2026, estimated intensity II (weak) in town; 4,305 felt reports to USGS. Every earthquake near Tremonton

This page: a magnitude 1.5 earthquake was recorded 14 km (9 mi) west-southwest of Tremonton, UT, at 11:43 pm MDT on 11 September 2021 (05:43 UTC), 6.7 km deep.

USGS: 4 km SSW of Thatcher, Utah

41 km (25 mi) WSW of Logan, UT · 103 km (64 mi) NNW of Salt Lake City, UT

11:43 pm MDT, Sep 11, 2021 · 2021-09-12 05:43 UTC · 6.7 km deep · released about 5.4 lb of TNT

Every earthquake near Tremonton Felt it? Tell USGS Check my area

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: 11:43 pm MDT on 11 September 2021 (2021-09-12 05:43 UTC)
Where: 14 km (9 mi) west-southwest of Tremonton, UT · earthquakes near Tremonton
Magnitude: M 1.5 (md)
Depth: 6.7 km below the surface
Felt: no reports yet
Nearest: Cache County, 48 km E
Nearest mapped fault: Wasatch fault, 21 km from its surface trace — near is not the same as on
Status: Reviewed by a seismologist

USGS · last changed by USGS 1885 days ago · we first saw it 1885 days ago

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 7 km (4 mi) from the epicentre. In Tremonton, 14 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.

Earthquakes near other towns within 30 km: Elwood, Garland, Honeyville, Mendon.

How big was it?

This earthquake released about 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
Around the size people start to feel M 3.0 180× the energy of this one
This earthquake M 1.5 about 5.4 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists 8 earthquakes of M5 or more within 50 km; the five largest:

6.6 The 1934 Hansel Valley, Utah Earthquake · 40 km W of this epicentre Mar 12, 1934
6.1 17 km NE of Snowville, Utah · 49 km NNW of this epicentre Mar 28, 1975
5.9 35 km SSW of Howell, Utah · 33 km WSW of this epicentre Mar 12, 1934
5.6 Hansel Valley, Utah · 35 km WNW of this epicentre Oct 6, 1909
5.2 27 km SW of Thatcher, Utah · 23 km SW of this epicentre Apr 14, 1934

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

Map loads when it scrolls into view

Nearby places

Place	Distance	Direction from the epicentre
Cache County, UT	48 km (30 mi)	E	earthquakes near Cache County
Weber County, UT	57 km (35 mi)	SE	earthquakes near Weber County
Oneida County, ID	61 km (38 mi)	NNW	earthquakes near Oneida County
Box Elder County, UT	62 km (38 mi)	W	earthquakes near Box Elder County
Davis County, UT	70 km (43 mi)	S	earthquakes near Davis County
Franklin County, ID	71 km (44 mi)	NE	earthquakes near Franklin County

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

Aftershocks so far

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

1.7 7 km SW of Corinne, Utah 18:20 UTC
1.6 11 km SSW of Malad City, Idaho 19:36 UTC
2.2 7 km SW of Corinne, Utah 11:52 UTC
1.6 7 km SW of Corinne, Utah 17:04 UTC
1.9 Utah 12:30 UTC
2.8 7 km SW of Corinne, Utah 12:04 UTC
2.1 7 km SW of Corinne, Utah 09:57 UTC
1.7 7 km SW of Corinne, Utah 22:09 UTC
1.9 7 km SW of Corinne, Utah 07:20 UTC
2.3 Utah 01:53 UTC
2.5 7 km SW of Corinne, Utah 01:53 UTC
1.6 8 km SW of Corinne, Utah 21:40 UTC
3.6 7 km SW of Corinne, Utah 13:45 UTC
1.8 7 km SW of Corinne, Utah 13:15 UTC
1.9 Utah 18:01 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 01:57 UTC. 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.