13 km E of Boulder Town, Utah

2024-08-20 14:29 UTC · 19 km deep · released about 15 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: 2024-08-20 14:29 UTC
Magnitude: M 1.8 (ml)
Depth: 19 km below the surface
Felt: no reports yet
Nearest: Garfield County, 19 km WSW
Status: Reviewed by a seismologist

USGS · last changed by USGS 768 days ago · we first saw it 768 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
Magna, Utah 2020 M 5.7 730,000× the energy of this one
Around the size people start to feel M 3.0 65× the energy of this one
This earthquake M 1.8 about 15 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 37.9215, -111.2735. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Garfield County, UT	19 km (11 mi)	ENE of here	earthquakes near Garfield County
Wayne County, UT	45 km (28 mi)	SSW of here	earthquakes near Wayne County
Kane County, UT	86 km (54 mi)	NNE of here	earthquakes near Kane County
Piute County, UT	88 km (55 mi)	ESE of here	earthquakes near Piute County
Sevier County, UT	103 km (64 mi)	SSE of here	earthquakes near Sevier County

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

Aftershocks so far

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

1.7 19 km SSE of Boulder Town, Utah 08:02 UTC
2.1 27 km WNW of Boulder Town, Utah 17:40 UTC
2.4 31 km SE of Boulder Town, Utah 03:40 UTC
1.5 28 km E of Torrey, Utah 19:44 UTC
2.2 28 km E of Torrey, Utah 01:18 UTC
1.6 20 km SE of Boulder Town, Utah 07:31 UTC
2.6 28 km NE of Boulder Town, Utah 00:30 UTC
2.5 47 km NNW of Halls Crossing, Utah 12:15 UTC
3.5 26 km SSE of Boulder Town, Utah 10:44 UTC
2.0 26 km SE of Boulder Town, Utah 20:39 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 18:39 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.