QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

2 km WNW of Falls City, Texas

· 7.7 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Karnes County 20 kmWilson County 21 kmAtascosa County 50 kmGuadalupe County 66 kmDeWitt County 66 kmBexar County 69 kmGoliad County 70 kmBee County 70 kmLive Oak 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 1.8 (ml)
Depth
7.7 km below the surface
Felt
no reports yet
Nearest
Karnes County, 20 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 28.9930, -98.0370. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Karnes County, TX 20 km (13 mi) WNW of here earthquakes near Karnes County
Wilson County, TX 21 km (13 mi) SSE of here earthquakes near Wilson County
Atascosa County, TX 50 km (31 mi) ENE of here earthquakes near Atascosa County
Guadalupe County, TX 66 km (41 mi) S of here earthquakes near Guadalupe County
DeWitt County, TX 66 km (41 mi) W of here earthquakes near DeWitt County
Bexar County, TX 69 km (43 mi) SE of here earthquakes near Bexar 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 8 km E of Falls City, Texas
  2. 1.5 15 km NE of Falls City, Texas
  3. 2.3 22 km NNW of Three Rivers, Texas
  4. 2.1 16 km WNW of Pawnee, Texas
  5. 1.7 16 km WNW of Pawnee, Texas
  6. 1.5 16 km WNW of Pawnee, Texas
  7. 1.6 14 km WNW of Pawnee, Texas
  8. 1.6 15 km WNW of Pawnee, Texas
  9. 1.5 15 km WNW of Pawnee, Texas
  10. 1.7 15 km WNW of Pawnee, Texas
  11. 1.8 15 km WNW of Pawnee, Texas
  12. 1.6 15 km WNW of Pawnee, Texas
  13. 1.6 14 km WNW of Pawnee, Texas
  14. 1.7 15 km WNW of Pawnee, Texas
  15. 1.6 15 km WNW of Pawnee, 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 4.6 on 2025-01-30 — it released about 16,000 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.