10 km SSW of Milford, Utah

2021-04-20 04:34 UTC · -3.4 km deep · released about 130 lb of TNT

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: 2021-04-20 04:34 UTC
Magnitude: M 2.4 (ml)
Depth: -3.4 km below the surface
Felt: no reports yet
Nearest: Beaver County, 16 km WNW
Status: Reviewed by a seismologist

USGS · last changed by USGS 1986 days ago · we first saw it 1986 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 130 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 5.8 120,000× the energy of this one
Magna, Utah 2020 M 5.7 83,000× the energy of this one
Around the size people start to feel M 3.0 7.4× the energy of this one
This earthquake M 2.4 about 130 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

Map loads when it scrolls into view

Epicentre 38.3150, -113.0587. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Beaver County, UT	16 km (10 mi)	ESE of here	earthquakes near Beaver County
Iron County, UT	50 km (31 mi)	NNE of here	earthquakes near Iron County
Millard County, UT	72 km (45 mi)	S of here	earthquakes near Millard County
Piute County, UT	81 km (50 mi)	W of here	earthquakes near Piute County
Sevier County, UT	119 km (74 mi)	WSW of here	earthquakes near Sevier County
Washington County, UT	123 km (76 mi)	NNE of here	earthquakes near Washington 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.

1.7 14 km S of Beaver, Utah 22:41 UTC
1.6 16 km S of Beaver, Utah 02:11 UTC
1.6 Utah 19:17 UTC
2.1 17 km ENE of Milford, Utah 19:11 UTC
1.9 17 km ENE of Milford, Utah 19:10 UTC
1.6 17 km ENE of Milford, Utah 18:35 UTC
1.7 16 km S of Beaver, Utah 19:06 UTC
1.6 9 km SW of Milford, Utah 12:33 UTC
1.7 9 km SW of Milford, Utah 07:27 UTC
1.9 9 km WSW of Milford, Utah 06:59 UTC
1.7 9 km SW of Milford, Utah 06:49 UTC
2.0 9 km SW of Milford, Utah 04:39 UTC
1.8 Utah 23:36 UTC
1.8 8 km SW of Milford, Utah 22:04 UTC
2.4 6 km NE of Beaver, Utah 06:11 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 16:45 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.