17 km NNE of Hermleigh, Texas

2021-09-13 02:48 UTC · 7.9 km deep · released about 120 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: 2021-09-13 02:48 UTC
Magnitude: M 2.4 (ml)
Depth: 7.9 km below the surface
Felt: 2 reports · strongest reported intensity III
Nearest: Fisher County, 24 km E
Status: Reviewed by a seismologist

USGS · last changed by USGS 1769 days ago · we first saw it 1769 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 120 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 5.8 130,000× the energy of this one
Magna, Utah 2020 M 5.7 89,000× the energy of this one
Around the size people start to feel M 3.0 7.9× the energy of this one
This earthquake M 2.4 about 120 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 32.7695, -100.6573. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Fisher County, TX	24 km (15 mi)	W of here	earthquakes near Fisher County
Scurry County, TX	24 km (15 mi)	E of here	earthquakes near Scurry County
Kent County, TX	47 km (29 mi)	SSE of here	earthquakes near Kent County
Nolan County, TX	56 km (35 mi)	NNW of here	earthquakes near Nolan County
Mitchell County, TX	57 km (36 mi)	NNE of here	earthquakes near Mitchell County
Stonewall County, TX	59 km (37 mi)	SW of here	earthquakes near Stonewall 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.

2.1 16 km NE of Hermleigh, Texas 02:41 UTC
2.4 16 km NE of Hermleigh, Texas 01:47 UTC
2.2 16 km NE of Hermleigh, Texas 03:40 UTC
2.5 16 km NE of Hermleigh, Texas 00:06 UTC
2.4 18 km NNW of Snyder, Texas 17:49 UTC
2.1 23 km N of Snyder, Texas 23:27 UTC
1.5 16 km NE of Hermleigh, Texas 13:18 UTC
2.2 16 km NE of Hermleigh, Texas 05:17 UTC
1.8 19 km N of Snyder, Texas 04:50 UTC
2.9 17 km NNE of Hermleigh, Texas 15:37 UTC
2.4 western Texas 06:18 UTC
2.7 western Texas 16:06 UTC
2.3 western Texas 22:30 UTC
2.0 19 km N of Snyder, Texas 19:30 UTC
1.9 17 km NNE of Hermleigh, Texas 05:14 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 16:17 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 4.0 on 2019-09-30 — it released about 250 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.