QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4ml

Earthquake near Brigham City, UT

No earthquake was likely felt in Brigham City in the 24 hours to 5:10 pm MST (00:10 UTC). The last one was M 4.7, 116 km (72 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 Brigham City

This page: a magnitude 3.4 earthquake was recorded 35 km (22 mi) west-northwest of Brigham City, UT, at 8:16 pm MDT on 7 September 2024 (02:16 UTC), 5.0 km deep. 7 people have reported feeling it to USGS.

USGS: 15 km SW of Thatcher, Utah

99 km (61 mi) NNW of Salt Lake City, UT · 51 km (32 mi) WSW of Logan, UT

8:16 pm MDT, Sep 7, 2024 · · 5.0 km deep · released about 1.6 tons of TNT

Every earthquake near Brigham City Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Box Elder County 53 kmWeber County 57 kmCache County 58 kmDavis County 64 kmOneida County 67 kmFranklin County 82 kmMorgan County 89 kmRich County 98 kmSalt Lake County 110 km
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
8:16 pm MDT on 7 September 2024 ()
Where
35 km (22 mi) west-northwest of Brigham City, UT · earthquakes near Brigham City
Magnitude
M 3.4 (ml)
Depth
5.0 km below the surface
Felt
7 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Nearest
Box Elder County, 53 km W
Nearest mapped fault
North Promontory fault, 19 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 726 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 55 km (34 mi) from the epicentre. In Brigham City, 35 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: Tremonton 25 km, intensity II · Brigham City 35 km, intensity II · North Ogden 49 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 1.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 110,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,300× the energy of this one
  4. This earthquake M 3.4 about 1.6 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.3× 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 since 2016 was M 4.4 on 2024-05-05 — about 34 times the energy of this one.

Before 2016, the USGS record lists 7 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.6 The 1934 Hansel Valley, Utah Earthquake · 32 km WNW of this epicentre
  2. 5.9 35 km SSW of Howell, Utah · 23 km WSW of this epicentre
  3. 5.6 Hansel Valley, Utah · 33 km NW of this epicentre
  4. 5.5 56 km SW of Howell, Utah · 49 km W of this epicentre
  5. 5.2 27 km SW of Thatcher, Utah · 12 km SW 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 41.5860, -112.4205. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Box Elder County, UT 53 km (33 mi) W earthquakes near Box Elder County
Weber County, UT 57 km (36 mi) SE earthquakes near Weber County
Cache County, UT 58 km (36 mi) ENE earthquakes near Cache County
Davis County, UT 64 km (40 mi) SSE earthquakes near Davis County
Oneida County, ID 67 km (42 mi) N earthquakes near Oneida County
Franklin County, ID 82 km (51 mi) NE earthquakes near Franklin County

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

Aftershocks so far

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

  1. 1.6 16 km SW of Thatcher, Utah
  2. 1.7 11 km NNE of Howell, Utah
  3. 1.7 10 km NNW of Howell, Utah
  4. 2.4 9 km NNW of Howell, Utah
  5. 1.7 10 km NNW of Howell, Utah
  6. 1.8 10 km NNW of Howell, Utah
  7. 2.0 10 km NNW of Howell, Utah
  8. 2.1 11 km NNW of Howell, Utah
  9. 2.0 11 km NNW of Howell, Utah
  10. 1.8 11 km NNW of Howell, Utah
  11. 2.8 10 km NNW of Howell, Utah
  12. 1.5 12 km SSW of Snowville, Utah
  13. 2.4 13 km SSW of Snowville, Utah
  14. 2.0 10 km NNW of Howell, Utah
  15. 2.0 10 km NNW of Howell, 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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.