8 km SW of Kanosh, Utah

2019-02-20 07:05 UTC · 8.2 km deep · released about 17 tons 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: 2019-02-20 07:05 UTC
Magnitude: M 4.0 (ml)
Depth: 8.2 km below the surface
Felt: 85 reports · strongest reported intensity IV
Measured shaking: intensity IV (ShakeMap)
USGS impact alert: green
Nearest: Piute County, 55 km SE
Status: Reviewed by a seismologist

USGS · last changed by USGS 1971 days ago · we first saw it 1971 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 85 people have reported feeling it to USGS.

How big was it?

This earthquake released about 17 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

Northridge, California 1994 M 6.7 9,800× the energy of this one
Mineral, Virginia 2011 M 5.8 440× the energy of this one
Magna, Utah 2020 M 5.7 310× the energy of this one
This earthquake M 4.0 about 17 tons of TNT
Around the size people start to feel M 3.0 this one released 36× 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

Map loads when it scrolls into view

Epicentre 38.7375, -112.4965. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Piute County, UT	55 km (34 mi)	NW of here	earthquakes near Piute County
Sevier County, UT	59 km (37 mi)	W of here	earthquakes near Sevier County
Millard County, UT	60 km (37 mi)	ESE of here	earthquakes near Millard County
Beaver County, UT	77 km (48 mi)	ENE of here	earthquakes near Beaver County
Sanpete County, UT	106 km (66 mi)	SW of here	earthquakes near Sanpete County
Juab County, UT	112 km (69 mi)	SSE of here	earthquakes near Juab County

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

Aftershocks so far

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

1.9 19 km ENE of Milford, Utah 15:32 UTC
1.7 10 km S of Marysvale, Utah 21:38 UTC
1.8 5 km WNW of Sigurd, Utah 00:00 UTC
2.3 6 km SSE of Joseph, Utah 13:53 UTC
1.7 6 km SSE of Joseph, Utah 13:33 UTC
1.6 14 km SW of Kanosh, Utah 10:56 UTC
1.6 8 km WNW of Sigurd, Utah 00:46 UTC
1.6 6 km S of Joseph, Utah 13:00 UTC
2.0 25 km SSW of Kanosh, Utah 05:02 UTC
1.5 17 km NE of Milford, Utah 01:15 UTC
1.8 8 km ENE of Marysvale, Utah 03:35 UTC
2.4 5 km SW of Joseph, Utah 23:05 UTC
2.6 9 km WNW of Sigurd, Utah 17:27 UTC
1.9 5 km SW of Joseph, Utah 13:23 UTC
1.7 5 km SW of Joseph, Utah 16:11 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 12:26 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.