QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

14 km NW of Hilltop, Texas

· 5.2 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Frio County 20 kmZavala County 47 kmLa Salle County 52 kmDimmit County 61 kmMedina County 66 kmAtascosa County 74 kmUvalde County 78 kmMcMullen County 82 kmMaverick County 100 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
5.2 km below the surface
Felt
no reports yet
Nearest
Frio County, 20 km ENE
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 28.7830, -99.2900. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Frio County, TX 20 km (12 mi) WSW of here earthquakes near Frio County
Zavala County, TX 47 km (29 mi) E of here earthquakes near Zavala County
La Salle County, TX 52 km (32 mi) NNW of here earthquakes near La Salle County
Dimmit County, TX 61 km (38 mi) NE of here earthquakes near Dimmit County
Medina County, TX 66 km (41 mi) SSW of here earthquakes near Medina County
Atascosa County, TX 74 km (46 mi) W of here earthquakes near Atascosa County

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

Aftershocks so far

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

  1. 1.7 20 km NNW of Fowlerton, Texas
  2. 2.0 9 km ESE of Pearsall, Texas
  3. 1.5 10 km ESE of Pearsall, Texas
  4. 1.7 16 km SE of Pearsall, Texas
  5. 2.3 23 km NNW of Fowlerton, Texas
  6. 1.6 21 km NW of Fowlerton, Texas
  7. 1.7 11 km N of Hilltop, Texas
  8. 1.7 24 km NNW of Fowlerton, Texas
  9. 1.7 10 km SE of Pearsall, Texas
  10. 1.7 19 km SW of Charlotte, Texas
  11. 1.7 9 km SE of Pearsall, Texas
  12. 1.7 22 km NNW of Fowlerton, Texas
  13. 2.3 11 km SE of Pearsall, Texas
  14. 1.5 15 km SE of Pearsall, Texas
  15. 1.7 24 km NNW of Fowlerton, 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.

On USGS

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