24 km S of Brian Head, Utah

2024-07-29 05:29 UTC · 20 km deep · released about 76 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: 2024-07-29 05:29 UTC
Magnitude: M 4.5 (ml)
Depth: 20 km below the surface
Felt: 3623 reports · strongest reported intensity VI
Measured shaking: intensity V (ShakeMap)
USGS impact alert: green
Nearest: Washington County, 61 km WSW
Status: Reviewed by a seismologist

USGS · last changed by USGS 75 days ago · we first saw it 75 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 3623 people have reported feeling it to USGS.

How big was it?

This earthquake released about 76 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.5 would have released about 32 times as much.

Northridge, California 1994 M 6.7 2,200× the energy of this one
Mineral, Virginia 2011 M 5.8 99× the energy of this one
Magna, Utah 2020 M 5.7 70× the energy of this one
This earthquake M 4.5 about 76 tons of TNT
Around the size people start to feel M 3.0 this one released 160× 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 37.4725, -112.8523. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Washington County, UT	61 km (38 mi)	ENE of here	earthquakes near Washington County
Iron County, UT	63 km (39 mi)	SE of here	earthquakes near Iron County
Kane County, UT	94 km (59 mi)	WNW of here	earthquakes near Kane County
Beaver County, UT	104 km (65 mi)	SSE of here	earthquakes near Beaver County
Piute County, UT	115 km (71 mi)	SSW of here	earthquakes near Piute County

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

Aftershocks so far

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

1.9 9 km E of Springdale, Utah 01:40 UTC
1.7 11 km ENE of Kanarraville, Utah 09:43 UTC
1.5 13 km ENE of Hildale, Utah 05:16 UTC
1.6 25 km S of Brian Head, Utah 23:46 UTC
1.7 10 km E of Springdale, Utah 16:18 UTC
1.7 12 km SSW of Orderville, Utah 19:50 UTC
1.7 10 km N of Alton, Utah 14:07 UTC
1.7 9 km E of Springdale, Utah 16:14 UTC
1.7 6 km WSW of Panguitch, Utah 13:21 UTC
2.5 9 km S of Cedar City, Utah 01:06 UTC
2.7 10 km NE of Hildale, Utah 15:57 UTC
1.8 3 km NE of Cedar City, Utah 23:00 UTC
1.7 5 km SE of Springdale, Utah 07:47 UTC
1.6 5 km N of Cedar City, Utah 04:06 UTC
1.5 13 km WNW of Cedar City, Utah 18:28 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 05:41 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.