QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

Earthquake near Logan, UT

No earthquake was likely felt in Logan in the 24 hours to 6:42 pm MST (01:42 UTC). The last one was M 2.6, 16 km (10 mi) ESE, at 6:52 am MDT on 25 June 2026, estimated intensity II (weak) in town; 19 felt reports to USGS. Every earthquake near Logan

This page: a magnitude 1.6 earthquake was recorded 20 km (13 mi) southeast of Logan, UT, at 1:19 pm MDT on 14 July 2021 (19:19 UTC), 9.4 km deep.

USGS: 12 km ENE of Avon, Utah

93 km (58 mi) NNE of Salt Lake City, UT · 21 km (13 mi) SE of Logan, UT

1:19 pm MDT, Jul 14, 2021 · · 9.4 km deep · released about 6.8 lb of TNT

Every earthquake near Logan Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cache County 17 kmRich County 37 kmWeber County 39 kmMorgan County 56 kmFranklin County 66 kmDavis County 75 kmBear Lake County 83 kmOneida County 96 kmUinta County 100 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
1:19 pm MDT on 14 July 2021 ()
Where
20 km (13 mi) southeast of Logan, UT · earthquakes near Logan
Magnitude
M 1.6 (md)
Depth
9.4 km below the surface
Felt
no reports yet
Nearest
Cache County, 17 km NNW
Nearest mapped fault
East Cache fault, 9 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 1947 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 5 km (3 mi) from the epicentre. In Logan, 20 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: Hyrum, Millville, Nibley, Providence, River Heights, Wellsville.

How big was it?

This earthquake released about 6.8 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 2,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
  3. Around the size people start to feel M 3.0 140× the energy of this one
  4. This earthquake M 1.6 about 6.8 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:

  1. 5.8 8 km W of Garden City, Utah · 41 km NNE of this epicentre
  2. 5.5 26 km E of Avon, Utah · 18 km SE of this epicentre
  3. 5.2 16 km ENE of North Logan, Utah · 24 km NNE of this epicentre
  4. 5.0 2 km S of Richmond, Utah · 36 km NNW 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 41.5918, -111.6817. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Cache County, UT 17 km (10 mi) NNW earthquakes near Cache County
Rich County, UT 37 km (23 mi) E earthquakes near Rich County
Weber County, UT 39 km (24 mi) SSW earthquakes near Weber County
Morgan County, UT 56 km (35 mi) S earthquakes near Morgan County
Franklin County, ID 66 km (41 mi) N earthquakes near Franklin County
Davis County, UT 75 km (47 mi) SW earthquakes near Davis County

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

Aftershocks so far

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

  1. 1.9 3 km NNW of Benson, Utah
  2. 2.8 2 km N of Benson, Utah
  3. 2.0 0 km ENE of Benson, Utah
  4. 2.6 2 km NW of Benson, Utah
  5. 2.5 2 km NNE of Benson, Utah
  6. 2.3 0 km NW of Benson, Utah
  7. 2.6 3 km SSE of Trenton, Utah
  8. 1.7 7 km SW of Corinne, Utah
  9. 1.5 7 km SW of Corinne, Utah
  10. 1.6 11 km ENE of Wolf Creek, Utah
  11. 1.6 3 km NW of Amalga, Utah
  12. 2.1 10 km E of Providence, Utah
  13. 1.8 10 km E of Providence, Utah
  14. 1.7 7 km SW of Corinne, Utah
  15. 2.0 3 km WSW of Huntsville, 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.