QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

8 km NNW of Forsan, Texas

· 7.7 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Howard County 14 kmGlasscock County 37 kmMitchell County 47 kmSterling County 51 kmMartin County 55 kmBorden County 62 kmMidland County 70 kmScurry County 77 kmCoke County 80 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 1.9 (ml)
Depth
7.7 km below the surface
Felt
no reports yet
Nearest
Howard County, 14 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 307 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
  3. Around the size people start to feel M 3.0 45× the energy of this one
  4. This earthquake M 1.9 about 21 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

Epicentre 32.1840, -101.4010. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Howard County, TX 14 km (9 mi) SSE of here earthquakes near Howard County
Glasscock County, TX 37 km (23 mi) NNE of here earthquakes near Glasscock County
Mitchell County, TX 47 km (29 mi) WSW of here earthquakes near Mitchell County
Sterling County, TX 51 km (31 mi) NW of here earthquakes near Sterling County
Martin County, TX 55 km (34 mi) ESE of here earthquakes near Martin County
Borden County, TX 62 km (38 mi) S of here earthquakes near Borden County

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

Aftershocks so far

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

  1. 2.6 24 km SSW of Westbrook, Texas
  2. 3.4 24 km SSW of Westbrook, Texas
  3. 2.0 24 km SSW of Westbrook, Texas
  4. 2.8 24 km SSW of Westbrook, Texas
  5. 1.7 6 km WNW of Westbrook, Texas
  6. 1.9 24 km SSW of Westbrook, Texas
  7. 2.6 24 km SSW of Westbrook, Texas
  8. 2.3 20 km NW of Westbrook, Texas
  9. 1.5 14 km SSW of Big Spring, Texas
  10. 2.1 24 km SSW of Westbrook, Texas
  11. 2.2 16 km SE of Coahoma, Texas
  12. 2.5 16 km SE of Coahoma, Texas
  13. 1.5 23 km S of Westbrook, Texas
  14. 2.4 9 km N of Garden City, Texas
  15. 2.6 9 km N of Garden City, 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 4.6 on 2021-12-28 — it released about 11,000 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.