QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

15 km SW of Thatcher, Utah

· 8.1 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Box Elder County 54 kmWeber County 57 kmCache County 58 kmDavis County 63 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
Magnitude
M 1.8 (ml)
Depth
8.1 km below the surface
Felt
no reports yet
Nearest
Box Elder County, 54 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 188 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

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 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× 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.

Where

Epicentre 41.5855, -112.4140. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Box Elder County, UT 54 km (33 mi) E of here earthquakes near Box Elder County
Weber County, UT 57 km (35 mi) NW of here earthquakes near Weber County
Cache County, UT 58 km (36 mi) WSW of here earthquakes near Cache County
Davis County, UT 63 km (39 mi) NNW of here earthquakes near Davis County
Oneida County, ID 67 km (42 mi) S of here earthquakes near Oneida County
Franklin County, ID 82 km (51 mi) SW of here earthquakes near Franklin County

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

Aftershocks so far

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

  1. 2.1 15 km WNW of Howell, Utah
  2. 2.0 12 km NNE of Howell, Utah
  3. 1.7 30 km SSW of Snowville, Utah
  4. 1.9 18 km SW of Howell, Utah
  5. 3.1 12 km SSW of Snowville, Utah
  6. 1.9 11 km SSW of Snowville, Utah
  7. 1.9 11 km SSW of Snowville, Utah
  8. 1.9 8 km WSW of Thatcher, Utah
  9. 1.9 7 km W of Thatcher, Utah
  10. 1.8 7 km W of Thatcher, Utah
  11. 1.5 53 km SW of Howell, Utah
  12. 1.8 53 km SW of Howell, Utah
  13. 2.1 12 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.4 on 2024-05-05 — it released about 7,200 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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