QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

18 km SW of Floresville, Texas

· 8.8 km deep · released about 7.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Wilson County 26 kmAtascosa County 28 kmKarnes County 42 kmBexar County 56 kmGuadalupe County 72 kmLive Oak County 73 kmMcMullen County 74 kmBee County 83 kmFrio County 83 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 1.6 (ml)
Depth
8.8 km below the surface
Felt
no reports yet
Nearest
Wilson County, 26 km NE
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 7.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.6 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 28.9970, -98.2690. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Wilson County, TX 26 km (16 mi) SW of here earthquakes near Wilson County
Atascosa County, TX 28 km (18 mi) ENE of here earthquakes near Atascosa County
Karnes County, TX 42 km (26 mi) WNW of here earthquakes near Karnes County
Bexar County, TX 56 km (35 mi) SSE of here earthquakes near Bexar County
Guadalupe County, TX 72 km (45 mi) SSW of here earthquakes near Guadalupe County
Live Oak County, TX 73 km (45 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

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

  1. 1.8 13 km NW of Pawnee, Texas
  2. 1.6 26 km NW of Pawnee, Texas
  3. 2.3 26 km E of Christine, Texas
  4. 1.6 26 km NW of Pawnee, Texas
  5. 1.9 19 km ESE of Pleasanton, Texas
  6. 2.0 19 km ESE of Pleasanton, Texas
  7. 1.7 19 km ESE of Pleasanton, Texas
  8. 1.9 24 km E of Christine, Texas
  9. 1.5 24 km E of Christine, Texas
  10. 1.6 24 km E of Christine, Texas
  11. 3.0 20 km SW of Falls City, Texas
  12. 2.5 19 km SW of Falls City, Texas
  13. 3.0 19 km SW of Falls City, Texas
  14. 2.7 20 km SW of Falls City, Texas
  15. 2.1 19 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 4,000 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.