QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

17 km W of Portage, Utah

· 6.6 km deep · released about 1,300 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Oneida County 24 kmFranklin County 56 kmCache County 64 kmBox Elder County 65 kmBannock County 81 kmPower County 86 kmWeber County 92 kmBear Lake County 98 kmCassia County 103 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 3.1 (ml)
Depth
6.6 km below the surface
Felt
5 reports · strongest reported intensity III
Measured shaking
intensity IV (ShakeMap)
Nearest
Oneida County, 24 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2261 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 5 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 270,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 8,500× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.3× 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.

Where

Epicentre 41.9798, -112.4463. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Oneida County, ID 24 km (15 mi) SSE of here earthquakes near Oneida County
Franklin County, ID 56 km (35 mi) WSW of here earthquakes near Franklin County
Cache County, UT 64 km (40 mi) WNW of here earthquakes near Cache County
Box Elder County, UT 65 km (40 mi) NE of here earthquakes near Box Elder County
Bannock County, ID 81 km (51 mi) SSW of here earthquakes near Bannock County
Power County, ID 86 km (53 mi) SSE of here earthquakes near Power County

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

Aftershocks so far

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

  1. 1.7 17 km W of Portage, Utah
  2. 2.3 18 km W of Portage, Utah
  3. 1.5 5 km SSE of Snowville, Utah
  4. 1.7 7 km SE of Snowville, Utah
  5. 1.8 5 km SE of Snowville, Utah
  6. 2.1 6 km SE of Snowville, Utah
  7. 2.2 5 km SE of Snowville, Utah
  8. 2.1 5 km SSE of Snowville, Utah
  9. 1.7 5 km SE of Snowville, Utah
  10. 2.0 17 km S of Snowville, Utah
  11. 2.0 16 km S of Snowville, Utah
  12. 2.3 5 km SSW of Thatcher, Utah
  13. 2.2 5 km SSW of Thatcher, Utah
  14. 2.1 5 km SSW of Thatcher, Utah
  15. 1.5 4 km SSW 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.