QuakeIndex

Earthquake · reviewed by a seismologist

M 4.1ml

16 km ENE of Falls City, Texas

· 7.9 km deep · released about 21 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Karnes County 16 kmWilson County 26 kmDeWitt County 49 kmGonzales County 58 kmGuadalupe County 60 kmGoliad County 60 kmAtascosa County 68 kmBee County 71 kmBexar County 78 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 4.1 (ml)
Depth
7.9 km below the surface
Felt
71 reports · strongest reported intensity IV
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Karnes County, 16 km S
Status
Reviewed by a seismologist

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

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 71 people have reported feeling it to USGS.

How big was it?

This earthquake released about 21 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 7,900× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 350× the energy of this one
  3. Magna, Utah 2020 M 5.7 250× the energy of this one
  4. This earthquake M 4.1 about 21 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 45× 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 29.0490, -97.8640. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Karnes County, TX 16 km (10 mi) N of here earthquakes near Karnes County
Wilson County, TX 26 km (16 mi) ESE of here earthquakes near Wilson County
DeWitt County, TX 49 km (30 mi) W of here earthquakes near DeWitt County
Gonzales County, TX 58 km (36 mi) SW of here earthquakes near Gonzales County
Guadalupe County, TX 60 km (37 mi) S of here earthquakes near Guadalupe County
Goliad County, TX 60 km (38 mi) NW of here earthquakes near Goliad County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.2 7 km SSW of Falls City, Texas
  2. 1.5 8 km SSW of Falls City, Texas
  3. 1.5 13 km S of Smiley, Texas
  4. 1.6 13 km S of Smiley, Texas
  5. 2.7 7 km SW of Falls City, Texas
  6. 1.6 12 km S of Smiley, Texas
  7. 1.9 8 km SSE of Smiley, Texas
  8. 1.7 12 km S of Smiley, Texas
  9. 1.5 8 km SSW of Falls City, Texas
  10. 2.3 7 km SSW of Falls City, Texas
  11. 1.8 12 km S of Smiley, Texas
  12. 1.9 12 km S of Smiley, Texas
  13. 3.9 3 km N of Nordheim, Texas
  14. 1.9 8 km SW of Falls City, Texas
  15. 1.8 8 km SSW 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.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.