QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

Earthquake near Brigham City, UT

No earthquake was likely felt in Brigham City in the 24 hours to 4:32 pm MST (23:32 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 1.5 earthquake was recorded 33 km (21 mi) west-northwest of Brigham City, UT, at 6:02 am MDT on 12 May 2024 (12:02 UTC), 8.7 km deep.

USGS: 15 km SW of Thatcher, Utah

98 km (61 mi) NNW of Salt Lake City, UT · 50 km (31 mi) WSW of Logan, UT

6:02 am MDT, May 12, 2024 · · 8.7 km deep · released about 5.4 lb of TNT

Every earthquake near Brigham City Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Box Elder County 55 kmWeber County 56 kmCache County 58 kmDavis County 63 kmOneida County 68 kmFranklin County 82 kmMorgan County 88 kmRich County 97 kmSalt Lake County 109 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
6:02 am MDT on 12 May 2024 ()
Where
33 km (21 mi) west-northwest of Brigham City, UT · earthquakes near Brigham City
Magnitude
M 1.5 (md)
Depth
8.7 km below the surface
Felt
no reports yet
Nearest
Box Elder County, 55 km W
Nearest mapped fault
North Promontory fault, 20 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 844 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 5 km (3 mi) from the epicentre. In Brigham City, 33 km away, the estimate is intensity I (not felt). 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: Tremonton, Elwood, Garland, Honeyville.

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.

  1. Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. 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

The largest earthquake within 50 km since 2016 was M 4.4 on 2024-05-05 — about 20,000 times the energy of this one.

Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.6 The 1934 Hansel Valley, Utah Earthquake · 33 km WNW of this epicentre
  2. 5.9 35 km SSW of Howell, Utah · 24 km WSW of this epicentre
  3. 5.6 Hansel Valley, Utah · 35 km NW of this epicentre
  4. 5.2 27 km SW of Thatcher, Utah · 12 km SW of this epicentre
  5. 5.1 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 41.5805, -112.4063. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Box Elder County, UT 55 km (34 mi) W earthquakes near Box Elder County
Weber County, UT 56 km (35 mi) SE earthquakes near Weber County
Cache County, UT 58 km (36 mi) ENE earthquakes near Cache County
Davis County, UT 63 km (39 mi) SSE earthquakes near Davis County
Oneida County, ID 68 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. 1.7 6 km ESE of Howell, Utah
  2. 1.7 10 km ESE of Snowville, Utah
  3. 1.7 10 km ESE of Snowville, Utah
  4. 1.6 16 km SW of Thatcher, Utah
  5. 2.1 16 km SW of Thatcher, Utah
  6. 2.0 16 km SW of Thatcher, Utah
  7. 1.9 15 km SW of Thatcher, Utah
  8. 2.3 15 km SW of Thatcher, Utah
  9. 2.4 15 km SW of Thatcher, Utah
  10. 2.1 15 km SW of Thatcher, Utah
  11. 1.8 16 km SW of Thatcher, Utah
  12. 1.5 16 km SW of Thatcher, Utah
  13. 3.4 15 km SW of Thatcher, Utah
  14. 1.6 14 km SW of Thatcher, Utah
  15. 1.5 13 km SW of Thatcher, 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.