QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

5 km S of Falls City, Texas

· 6.1 km deep · released about 1,300 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Karnes County 17 kmWilson County 27 kmAtascosa County 50 kmBee County 64 kmGoliad County 66 kmLive Oak County 66 kmDeWitt County 67 kmGuadalupe County 73 kmBexar 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 3.1 (ml)
Depth
6.1 km below the surface
Felt
8 reports · strongest reported intensity III
Nearest
Karnes County, 17 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 452 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 8 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× more

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 28.9340, -98.0260. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Karnes County, TX 17 km (11 mi) W of here earthquakes near Karnes County
Wilson County, TX 27 km (17 mi) SSE of here earthquakes near Wilson County
Atascosa County, TX 50 km (31 mi) E of here earthquakes near Atascosa County
Bee County, TX 64 km (40 mi) NNW of here earthquakes near Bee County
Goliad County, TX 66 km (41 mi) WNW of here earthquakes near Goliad County
Live Oak County, TX 66 km (41 mi) N of here earthquakes near Live Oak 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. 2.0 22 km NNW of Three Rivers, Texas
  2. 1.7 9 km ENE of Christine, Texas
  3. 2.0 22 km NNW of Three Rivers, Texas
  4. 1.5 23 km NNW of Three Rivers, Texas
  5. 1.5 22 km NNW of Three Rivers, Texas
  6. 1.7 20 km ENE of Falls City, Texas
  7. 1.8 18 km ENE of Falls City, Texas
  8. 1.7 19 km ENE of Falls City, Texas
  9. 1.6 22 km NNW of Three Rivers, Texas
  10. 1.6 22 km NNW of Three Rivers, Texas
  11. 1.5 22 km NNW of Three Rivers, Texas
  12. 2.0 23 km NNW of Three Rivers, Texas
  13. 2.3 23 km NNW of Three Rivers, Texas
  14. 1.6 23 km NNW of Three Rivers, Texas
  15. 2.1 23 km NNW of Three Rivers, 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 22 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.