QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

29 km SSW of Snowville, Utah

Yes. A magnitude 1.6 earthquake was recorded 29 km SSW of Snowville, Utah, at 8:53 am MST on 18 December 2025 (15:53 UTC), 3.2 km deep.

· 3.2 km deep · released about 7.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Box Elder County 21 kmOneida County 58 kmCassia County 91 kmCache County 91 kmDavis County 92 kmWeber County 94 kmFranklin County 98 kmPower County 109 kmBannock County 120 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
Magnitude
M 1.6 (md)
Depth
3.2 km below the surface
Felt
no reports yet
Nearest
Box Elder County, 21 km WSW
Nearest mapped fault
Hansel Valley fault, 8 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 330 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 11 km (7 mi) from the epicentre. 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 7.6 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.

  1. Mineral, Virginia 2011 M 5.8 2,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.6 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 14,000 times the energy of this one.

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

  1. 6.6 The 1934 Hansel Valley, Utah Earthquake · 7 km SSE of this epicentre
  2. 6.1 17 km NE of Snowville, Utah · 45 km NNE of this epicentre
  3. 5.9 35 km SSW of Howell, Utah · 24 km SSE of this epicentre
  4. 5.6 Hansel Valley, Utah · 15 km NE of this epicentre
  5. 5.5 56 km SW of Howell, Utah · 27 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 41.7148, -112.8382. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Box Elder County, UT 21 km (13 mi) WSW earthquakes near Box Elder County
Oneida County, ID 58 km (36 mi) NNE earthquakes near Oneida County
Cassia County, ID 91 km (56 mi) NW earthquakes near Cassia County
Cache County, UT 91 km (56 mi) E earthquakes near Cache County
Davis County, UT 92 km (57 mi) SE earthquakes near Davis County
Weber County, UT 94 km (58 mi) ESE earthquakes near Weber County

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

Aftershocks so far

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

  1. 0.9 16 km SW of Thatcher, Utah
  2. 1.6 49 km SSW of Snowville, Utah
  3. 0.9 10 km SSW of Portage, 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. 2.0 12 km NNE of Howell, Utah
  9. 1.7 30 km SSW of Snowville, Utah
  10. 1.9 18 km SW of Howell, Utah
  11. 3.1 12 km SSW of Snowville, Utah
  12. 1.9 11 km SSW of Snowville, Utah
  13. 1.9 11 km SSW of Snowville, Utah
  14. 1.9 8 km WSW of Thatcher, Utah
  15. 1.9 7 km W 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.