QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

17 km S of Nixon, Texas

· 8.0 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Karnes County 24 kmWilson County 32 kmDeWitt County 39 kmGonzales County 47 kmGuadalupe County 55 kmGoliad County 60 kmBee County 77 kmAtascosa County 79 kmCaldwell 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 2.1 (ml)
Depth
8.0 km below the surface
Felt
no reports yet
Nearest
Karnes County, 24 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 452 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 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 29.1120, -97.7600. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Karnes County, TX 24 km (15 mi) NNE of here earthquakes near Karnes County
Wilson County, TX 32 km (20 mi) ESE of here earthquakes near Wilson County
DeWitt County, TX 39 km (24 mi) W of here earthquakes near DeWitt County
Gonzales County, TX 47 km (29 mi) SW of here earthquakes near Gonzales County
Guadalupe County, TX 55 km (34 mi) SSE of here earthquakes near Guadalupe County
Goliad County, TX 60 km (37 mi) NNW of here earthquakes near Goliad County

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

Aftershocks so far

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

  1. 1.9 8 km WNW of Yorktown, Texas
  2. 1.5 6 km NNW of Nordheim, Texas
  3. 1.7 7 km N of Nordheim, Texas
  4. 1.6 8 km WNW of Yorktown, Texas
  5. 1.7 8 km NW of Yorktown, Texas
  6. 1.6 9 km WNW of Yorktown, Texas
  7. 2.1 8 km WNW of Yorktown, Texas
  8. 1.5 7 km WNW of Yorktown, Texas
  9. 1.9 8 km N of Nordheim, Texas
  10. 1.7 8 km N of Nordheim, Texas
  11. 2.3 9 km N of Nordheim, Texas
  12. 2.2 8 km WNW of Yorktown, Texas
  13. 1.6 8 km WNW of Yorktown, Texas
  14. 2.2 6 km WNW of Yorktown, Texas
  15. 1.7 6 km NNW of Nordheim, 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 4.0 on 2018-05-01 — it released about 710 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.