Earthquake near Logan, UT

USGS: 18 km WSW of Woodruff, Utah

91 km (56 mi) NNE of Salt Lake City, UT · 48 km (30 mi) SE of Logan, UT

1:51 pm MDT, Jun 21, 2021 · 2021-06-21 19:51 UTC · 7.9 km deep · released about 120 lb of TNT

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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: 1:51 pm MDT on 21 June 2021 (2021-06-21 19:51 UTC)
Where: 47 km (29 mi) SE of Logan, UT · earthquakes near Logan
Magnitude: M 2.4 (ml)
Depth: 7.9 km below the surface
Felt: no reports yet
Nearest: Rich County, 20 km NE
Status: Reviewed by a seismologist

USGS · last changed by USGS 1862 days ago · we first saw it 1862 days ago

A magnitude 2.4 earthquake was recorded 47 km (29 mi) SE of Logan, UT, at 1:51 pm MDT on 21 June 2021 (19:51 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
Magna, Utah 2020 M 5.7 89,000× the energy of this one
Around the size people start to feel M 3.0 7.9× the energy of this one
This earthquake M 2.4 about 120 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 2 earthquakes of M5 or more within 50 km:

5.5 26 km E of Avon, Utah · 10 km WNW of this epicentre Apr 7, 1934
5.2 16 km ENE of North Logan, Utah · 41 km NNW of this epicentre Mar 17, 1966

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

Map loads when it scrolls into view

Epicentre 41.4825, -111.3837. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction from the epicentre
Rich County, UT	20 km (12 mi)	NE	earthquakes near Rich County
Cache County, UT	41 km (26 mi)	NW	earthquakes near Cache County
Morgan County, UT	46 km (29 mi)	SSW	earthquakes near Morgan County
Weber County, UT	47 km (29 mi)	WSW	earthquakes near Weber County
Uinta County, WY	72 km (45 mi)	ESE	earthquakes near Uinta County
Summit County, UT	76 km (47 mi)	SSE	earthquakes near Summit County

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

Aftershocks so far

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

2.7 6 km NE of Morgan, Utah 21:01 UTC
1.6 7 km ESE of North Logan, Utah 21:10 UTC
1.5 10 km NE of Morgan, Utah 05:01 UTC
2.7 Utah 04:36 UTC
1.6 11 km ENE of Wolf Creek, Utah 15:08 UTC
2.1 10 km E of Providence, Utah 09:35 UTC
1.8 10 km E of Providence, Utah 23:51 UTC
2.0 3 km WSW of Huntsville, Utah 16:12 UTC
1.6 13 km NE of Henefer, Utah 03:21 UTC
2.3 17 km ENE of North Logan, Utah 22:57 UTC
1.9 5 km E of Huntsville, Utah 23:16 UTC
1.6 5 km E of Huntsville, Utah 16:24 UTC
2.1 14 km E of Providence, Utah 00:56 UTC
1.7 13 km SE of Avon, Utah 11:17 UTC
1.6 10 km SE of Avon, Utah 20:08 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 02:47 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

The official USGS event page — the source of record for every value above
Did you feel it? Report it to USGS — reports go to USGS, not to us
ShakeMap for this event, when USGS has produced one

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