QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

10 km S of Forsan, Texas

· 9.7 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Glasscock County 22 kmHoward County 33 kmSterling County 35 kmMitchell County 52 kmMidland County 65 kmMartin County 66 kmCoke County 70 kmReagan County 72 kmBorden County 81 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 1.8 (ml)
Depth
9.7 km below the surface
Felt
no reports yet
Nearest
Glasscock County, 22 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 26 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.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. 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

Epicentre 32.0130, -101.3600. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Glasscock County, TX 22 km (14 mi) NE of here earthquakes near Glasscock County
Howard County, TX 33 km (21 mi) SSE of here earthquakes near Howard County
Sterling County, TX 35 km (22 mi) NW of here earthquakes near Sterling County
Mitchell County, TX 52 km (32 mi) SW of here earthquakes near Mitchell County
Midland County, TX 65 km (40 mi) ENE of here earthquakes near Midland County
Martin County, TX 66 km (41 mi) ESE of here earthquakes near Martin County

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

Aftershocks so far

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

  1. 1.6 30 km SW of Garden City, Texas
  2. 1.8 29 km SW of Garden City, Texas
  3. 1.4 29 km SW of Garden City, Texas
  4. 1.4 29 km SW of Garden City, Texas
  5. 0.4 15 km SSE of Stanton, Texas
  6. 1.1 3 km SSE of Sand Springs, Texas
  7. 1.3 11 km W of Forsan, Texas
  8. 0.4 25 km W of Garden City, Texas
  9. 0.8 18 km SE of Ackerly, Texas
  10. 1.1 18 km SE of Ackerly, Texas
  11. 0.6 25 km SW of Garden City, Texas
  12. 1.2 9 km NNW of Big Spring, Texas
  13. 1.0 11 km E of Stanton, Texas
  14. 1.2 11 km E of Stanton, Texas
  15. 0.8 10 km WSW of Forsan, 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 16,000 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.