QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

23 km SW of Falls City, Texas

· 8.7 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Karnes County 34 kmAtascosa County 34 kmWilson County 39 kmLive Oak County 54 kmMcMullen County 63 kmBee County 64 kmBexar County 75 kmGoliad County 76 kmDeWitt County 85 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
8.7 km below the surface
Felt
no reports yet
Nearest
Karnes County, 34 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 369 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 28.8360, -98.1880. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Karnes County, TX 34 km (21 mi) WSW of here earthquakes near Karnes County
Atascosa County, TX 34 km (21 mi) E of here earthquakes near Atascosa County
Wilson County, TX 39 km (24 mi) SSW of here earthquakes near Wilson County
Live Oak County, TX 54 km (34 mi) N of here earthquakes near Live Oak County
McMullen County, TX 63 km (39 mi) NE of here earthquakes near McMullen County
Bee County, TX 64 km (40 mi) NW of here earthquakes near Bee County

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

Aftershocks so far

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

  1. 1.7 6 km ENE of Charlotte, Texas
  2. 1.9 7 km ENE of Charlotte, Texas
  3. 1.8 11 km SW of Poth, Texas
  4. 1.6 13 km ENE of Falls City, Texas
  5. 1.9 16 km ENE of Falls City, Texas
  6. 1.5 3 km SE of Falls City, Texas
  7. 2.0 18 km SW of Falls City, Texas
  8. 2.1 9 km N of Three Rivers, Texas
  9. 2.0 17 km SW of Falls City, Texas
  10. 2.3 17 km SW of Falls City, Texas
  11. 2.7 17 km SW of Falls City, Texas
  12. 1.7 17 km SW of Falls City, Texas
  13. 2.5 19 km SW of Falls City, Texas
  14. 2.6 17 km SW of Falls City, Texas
  15. 1.7 17 km SW 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.