10 km WSW of Santa Clara, Utah

2023-08-31 05:31 UTC · -3.0 km deep · released about 13 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: 2023-08-31 05:31 UTC
Magnitude: M 1.8 (ml)
Depth: -3.0 km below the surface
Felt: no reports yet
Nearest: Washington County, 31 km NE
Status: Reviewed by a seismologist

USGS · last changed by USGS 1123 days ago · we first saw it 1123 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 13 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 1,200,000× the energy of this one
Magna, Utah 2020 M 5.7 840,000× the energy of this one
Around the size people start to feel M 3.0 75× the energy of this one
This earthquake M 1.8 about 13 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 37.0908, -113.7613. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Washington County, UT	31 km (19 mi)	SW of here	earthquakes near Washington County
Iron County, UT	99 km (62 mi)	SSW of here	earthquakes near Iron County
Lincoln County, NV	115 km (71 mi)	ESE of here	earthquakes near Lincoln County
Clark County, NV	148 km (92 mi)	NE of here	earthquakes near Clark County

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

Aftershocks so far

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

2.3 44 km W of Veyo, Utah 00:47 UTC
1.6 8 km NNE of Central, Utah 12:59 UTC
1.6 8 km NNE of Central, Utah 22:19 UTC
2.6 7 km NNE of Central, Utah 22:13 UTC
1.8 8 km NNE of Central, Utah 18:04 UTC
2.1 44 km W of Veyo, Utah 00:19 UTC
1.8 11 km W of Veyo, Utah 14:18 UTC
1.5 3 km N of Washington, Utah 07:53 UTC
1.8 22 km SSW of Saint George, Utah 07:05 UTC
2.0 28 km NNW of Beaver Dam, Arizona 04:15 UTC
1.9 11 km NNW of Leeds, Utah 20:43 UTC
1.5 10 km ESE of Pine Valley, Utah 15:52 UTC
1.8 1 km NW of Toquerville, Utah 23:56 UTC
1.9 44 km W of Veyo, Utah 13:50 UTC
2.0 9 km SW of New Harmony, Utah 01:36 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 17:00 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

For this area

The largest earthquake within 50 km in our catalogue was M 4.2 on 2016-01-15 — it released about 5,400 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

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.