QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

11 km S of Smiley, Texas

· 7.5 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N DeWitt County 28 kmKarnes County 36 kmGonzales County 36 kmWilson County 44 kmGuadalupe County 56 kmGoliad County 59 kmLavaca County 73 kmCaldwell County 74 kmVictoria County 76 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
7.5 km below the surface
Felt
no reports yet
Nearest
DeWitt County, 28 km ESE
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 29.1630, -97.6300. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
DeWitt County, TX 28 km (17 mi) WNW of here earthquakes near DeWitt County
Karnes County, TX 36 km (22 mi) NE of here earthquakes near Karnes County
Gonzales County, TX 36 km (22 mi) SSW of here earthquakes near Gonzales County
Wilson County, TX 44 km (28 mi) E of here earthquakes near Wilson County
Guadalupe County, TX 56 km (35 mi) SSE of here earthquakes near Guadalupe County
Goliad County, TX 59 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

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

  1. 2.6 3 km W of Falls City, Texas
  2. 1.7 3 km WSW of Falls City, Texas
  3. 2.2 9 km SE of Smiley, Texas
  4. 2.1 2 km SE of Falls City, Texas
  5. 1.9 19 km ENE of Falls City, Texas
  6. 1.8 6 km NNW of Nordheim, Texas
  7. 2.0 6 km NNW of Nordheim, Texas
  8. 2.0 7 km NNW of Nordheim, Texas
  9. 1.9 6 km NNW of Nordheim, Texas
  10. 2.4 6 km NNW of Nordheim, Texas
  11. 2.3 5 km NNW of Nordheim, Texas
  12. 2.2 6 km NNW of Nordheim, Texas
  13. 2.3 16 km ENE of Smiley, Texas
  14. 2.1 18 km SSE of Gonzales, Texas
  15. 1.9 18 km SSE of Gonzales, 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.