QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

4 km NNW of Nordheim, Texas

· 6.4 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Karnes County 22 kmDeWitt County 30 kmGoliad County 39 kmWilson County 50 kmGonzales County 57 kmBee County 61 kmVictoria County 67 kmGuadalupe County 76 kmLive Oak County 83 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
6.4 km below the surface
Felt
no reports yet
Nearest
Karnes County, 22 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 314 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 28.9600, -97.6330. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Karnes County, TX 22 km (14 mi) ENE of here earthquakes near Karnes County
DeWitt County, TX 30 km (18 mi) WSW of here earthquakes near DeWitt County
Goliad County, TX 39 km (24 mi) NNW of here earthquakes near Goliad County
Wilson County, TX 50 km (31 mi) ESE of here earthquakes near Wilson County
Gonzales County, TX 57 km (36 mi) SSW of here earthquakes near Gonzales County
Bee County, TX 61 km (38 mi) N of here earthquakes near Bee County

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

Aftershocks so far

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

  1. 1.9 4 km SSW of Falls City, Texas
  2. 2.1 3 km SSW of Falls City, Texas
  3. 2.0 3 km SSW of Falls City, Texas
  4. 1.9 4 km SSW of Falls City, Texas
  5. 1.9 4 km S of Falls City, Texas
  6. 2.0 18 km E of Smiley, Texas
  7. 2.2 17 km E of Smiley, Texas
  8. 1.5 17 km E of Smiley, Texas
  9. 1.7 6 km NNW of Nordheim, Texas
  10. 1.8 6 km NW of Nordheim, Texas
  11. 1.8 3 km SW of Falls City, Texas
  12. 1.5 4 km SW of Falls City, Texas
  13. 1.6 4 km WNW of Runge, Texas
  14. 1.7 8 km SW of Kenedy, Texas
  15. 2.2 7 km WSW of Kenedy, 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 2,000 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.