QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

3 km SW of Falls City, Texas

· 6.8 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Karnes County 19 kmWilson County 25 kmAtascosa County 49 kmBee County 67 kmDeWitt County 67 kmGoliad County 68 kmLive Oak County 68 kmGuadalupe County 70 kmBexar County 72 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
6.8 km below the surface
Felt
no reports yet
Nearest
Karnes County, 19 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 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 28.9570, -98.0390. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Karnes County, TX 19 km (12 mi) WNW of here earthquakes near Karnes County
Wilson County, TX 25 km (15 mi) S of here earthquakes near Wilson County
Atascosa County, TX 49 km (30 mi) E of here earthquakes near Atascosa County
Bee County, TX 67 km (41 mi) NNW of here earthquakes near Bee County
DeWitt County, TX 67 km (42 mi) WSW of here earthquakes near DeWitt County
Goliad County, TX 68 km (42 mi) WNW 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. 1.5 23 km NNW of Three Rivers, Texas
  2. 1.5 22 km NNW of Three Rivers, Texas
  3. 1.7 20 km ENE of Falls City, Texas
  4. 1.8 18 km ENE of Falls City, Texas
  5. 1.7 19 km ENE of Falls City, Texas
  6. 1.6 22 km NNW of Three Rivers, Texas
  7. 1.6 22 km NNW of Three Rivers, Texas
  8. 1.5 22 km NNW of Three Rivers, Texas
  9. 2.0 23 km NNW of Three Rivers, Texas
  10. 2.3 23 km NNW of Three Rivers, Texas
  11. 1.6 23 km NNW of Three Rivers, Texas
  12. 2.1 23 km NNW of Three Rivers, Texas
  13. 2.4 23 km NNW of Three Rivers, Texas
  14. 2.2 23 km NNW of Three Rivers, Texas
  15. 2.4 20 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 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.