QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

13 km SSE of Nixon, Texas

· 8.2 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Karnes County 31 kmDeWitt County 35 kmWilson County 37 kmGonzales County 40 kmGuadalupe County 52 kmGoliad County 62 kmCaldwell County 75 kmLavaca County 80 kmVictoria County 82 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
8.2 km below the surface
Felt
no reports yet
Nearest
Karnes County, 31 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 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 29.1600, -97.7090. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Karnes County, TX 31 km (19 mi) NNE of here earthquakes near Karnes County
DeWitt County, TX 35 km (22 mi) WNW of here earthquakes near DeWitt County
Wilson County, TX 37 km (23 mi) E of here earthquakes near Wilson County
Gonzales County, TX 40 km (25 mi) SSW of here earthquakes near Gonzales County
Guadalupe County, TX 52 km (33 mi) SSE of here earthquakes near Guadalupe County
Goliad County, TX 62 km (38 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. 1.7 13 km SSW of Falls City, Texas
  2. 2.1 14 km SW of Falls City, Texas
  3. 2.1 13 km SW of Falls City, Texas
  4. 1.6 14 km ENE of Falls City, Texas
  5. 1.6 19 km ENE of Falls City, Texas
  6. 1.8 19 km ENE of Falls City, Texas
  7. 2.7 19 km S of Nixon, Texas
  8. 2.7 19 km S of Nixon, Texas
  9. 1.8 8 km ENE of Falls City, Texas
  10. 1.8 13 km SW of Falls City, Texas
  11. 1.7 15 km SSW of Smiley, Texas
  12. 2.5 19 km ENE of Falls City, Texas
  13. 1.7 9 km WSW of Falls City, Texas
  14. 2.2 10 km WSW of Falls City, Texas
  15. 2.2 9 km WSW of Falls 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 4.0 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.