QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

8 km SSW of Randolph, Utah

· 0.9 km deep · released about 49 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Rich County 3 kmCache County 45 kmMorgan County 64 kmWeber County 65 kmUinta County 66 kmBear Lake County 77 kmFranklin County 80 kmLincoln County 83 kmSummit County 84 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 2.1 (ml)
Depth
0.9 km below the surface
Felt
no reports yet
Nearest
Rich County, 3 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 17 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 49 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 310,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 220,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 49 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 41.6000, -111.2305. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Rich County, UT 3 km (2 mi) SSE of here earthquakes near Rich County
Cache County, UT 45 km (28 mi) ESE of here earthquakes near Cache County
Morgan County, UT 64 km (40 mi) NNE of here earthquakes near Morgan County
Weber County, UT 65 km (40 mi) NE of here earthquakes near Weber County
Uinta County, WY 66 km (41 mi) WNW of here earthquakes near Uinta County
Bear Lake County, ID 77 km (48 mi) S of here earthquakes near Bear Lake County

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

Aftershocks so far

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

  1. 0.8 9 km W of Garden, Utah
  2. 1.6 17 km E of North Logan, Utah
  3. 1.7 8 km SSW of Randolph, 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.