QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

Earthquake near Tremonton, UT

No earthquake was likely felt in Tremonton in the 24 hours to 7:09 pm MST (02:09 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 1.8 earthquake was recorded 18 km (11 mi) west of Tremonton, UT, at 10:53 pm MDT on 30 April 2026 (04:53 UTC), 4.9 km deep.

USGS: 7 km W of Thatcher, Utah

45 km (28 mi) W of Logan, UT · 107 km (67 mi) NNW of Salt Lake City, UT

10:53 pm MDT, Apr 30, 2026 · · 4.9 km deep · released about 15 lb of TNT

Every earthquake near Tremonton Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cache County 53 kmBox Elder County 57 kmOneida County 57 kmWeber County 62 kmFranklin County 72 kmDavis County 73 kmMorgan County 94 kmRich County 95 kmBear 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
10:53 pm MDT on 30 April 2026 ()
Where
18 km (11 mi) west of Tremonton, UT · earthquakes near Tremonton
Magnitude
M 1.8 (ml)
Depth
4.9 km below the surface
Felt
no reports yet
Nearest
Cache County, 53 km E
Nearest mapped fault
North Promontory fault, 17 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 195 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 12 km (7 mi) from the epicentre. In Tremonton, 18 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: Garland, Elwood, Honeyville.

How big was it?

This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× the energy of this one
  4. This earthquake M 1.8 about 15 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 7,400 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 · 34 km W of this epicentre
  2. 6.1 17 km NE of Snowville, Utah · 44 km NNW of this epicentre
  3. 5.9 35 km SSW of Howell, Utah · 30 km SW of this epicentre
  4. 5.6 Hansel Valley, Utah · 29 km WNW of this epicentre
  5. 5.2 27 km SW of Thatcher, Utah · 22 km SSW 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 41.6820, -112.3825. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Cache County, UT 53 km (33 mi) E earthquakes near Cache County
Box Elder County, UT 57 km (35 mi) W earthquakes near Box Elder County
Oneida County, ID 57 km (35 mi) NNW earthquakes near Oneida County
Weber County, UT 62 km (39 mi) SE earthquakes near Weber County
Franklin County, ID 72 km (45 mi) NE earthquakes near Franklin County
Davis County, UT 73 km (46 mi) SSE earthquakes near Davis County

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

Aftershocks so far

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

  1. 0.9 16 km SW of Thatcher, Utah
  2. 0.9 10 km SSW of Portage, Utah
  3. 1.2 3 km NNE of Thatcher, Utah
  4. 0.5 8 km E of Howell, Utah
  5. 0.1 13 km E of Snowville, Utah
  6. 0.7 10 km SE of Snowville, Utah
  7. 2.1 15 km WNW of Howell, Utah
  8. 1.8 1 km SE of Cornish, Utah
  9. 1.7 1 km SE of Cornish, Utah
  10. 2.0 12 km NNE of Howell, Utah
  11. 1.7 30 km SSW of Snowville, Utah
  12. 1.9 18 km SW of Howell, Utah
  13. 3.1 12 km SSW of Snowville, Utah
  14. 1.9 11 km SSW of Snowville, Utah
  15. 1.9 11 km SSW of Snowville, 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.