QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

4 km SE of Falls City, Texas

· 7.5 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Karnes County 14 kmWilson County 27 kmAtascosa County 54 kmDeWitt County 63 kmGoliad County 63 kmBee County 64 kmLive Oak County 68 kmGuadalupe County 71 kmGonzales County 75 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
Karnes County, 14 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 28.9490, -97.9890. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Karnes County, TX 14 km (9 mi) WNW of here earthquakes near Karnes County
Wilson County, TX 27 km (17 mi) SSE of here earthquakes near Wilson County
Atascosa County, TX 54 km (33 mi) E of here earthquakes near Atascosa County
DeWitt County, TX 63 km (39 mi) WSW of here earthquakes near DeWitt County
Goliad County, TX 63 km (39 mi) WNW of here earthquakes near Goliad County
Bee County, TX 64 km (40 mi) NNW of here earthquakes near Bee 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. 1.9 8 km NNE of Three Rivers, Texas
  2. 2.1 8 km NNE of Three Rivers, Texas
  3. 1.6 11 km SSE of Smiley, Texas
  4. 2.1 9 km WNW of Yorktown, Texas
  5. 1.5 16 km S of Nixon, Texas
  6. 2.0 21 km W of Pawnee, Texas
  7. 2.4 11 km SSE of Smiley, Texas
  8. 1.7 21 km W of Pawnee, Texas
  9. 1.8 21 km W of Pawnee, Texas
  10. 1.9 2 km N of Falls City, Texas
  11. 2.0 13 km ENE of Falls City, Texas
  12. 1.6 12 km ENE of Falls City, Texas
  13. 2.1 11 km N of Three Rivers, Texas
  14. 1.5 11 km ENE of Falls City, Texas
  15. 1.8 12 km ENE 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.