QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4ml

24 km SSW of Westbrook, Texas

· 8.6 km deep · released about 1.9 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mitchell County 22 kmSterling County 34 kmHoward County 39 kmCoke County 50 kmGlasscock County 52 kmNolan County 64 kmScurry County 68 kmBorden County 75 kmMartin County 86 km
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
Magnitude
M 3.4 (ml)
Depth
8.6 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Mitchell County, 22 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 192 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 1.9 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 89,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,800× the energy of this one
  4. This earthquake M 3.4 about 1.9 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4× 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

Epicentre 32.1430, -101.0690. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mitchell County, TX 22 km (14 mi) SW of here earthquakes near Mitchell County
Sterling County, TX 34 km (21 mi) N of here earthquakes near Sterling County
Howard County, TX 39 km (24 mi) ESE of here earthquakes near Howard County
Coke County, TX 50 km (31 mi) NW of here earthquakes near Coke County
Glasscock County, TX 52 km (33 mi) NE of here earthquakes near Glasscock County
Nolan County, TX 64 km (40 mi) WSW of here earthquakes near Nolan County

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

Aftershocks so far

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

  1. 4.3 23 km SW of Snyder, Texas
  2. 1.9 9 km NNE of Garden City, Texas
  3. 1.8 10 km S of Forsan, Texas
  4. 1.5 26 km S of Westbrook, Texas
  5. 1.6 13 km S of Forsan, Texas
  6. 1.5 24 km SSW of Westbrook, Texas
  7. 1.5 11 km W of Forsan, Texas
  8. 1.7 12 km SW of Westbrook, Texas
  9. 1.5 10 km S of Forsan, Texas
  10. 2.4 11 km S of Forsan, Texas
  11. 1.8 24 km SSW of Westbrook, Texas
  12. 1.8 17 km SSE of Westbrook, Texas
  13. 1.7 24 km SSW of Westbrook, Texas
  14. 1.7 25 km SSW of Westbrook, Texas
  15. 1.7 24 km SSW of Westbrook, Texas

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . 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 4.3 on 2025-10-12 — it released about 22 times the energy of this one.

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

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.