QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

17 km WNW of Hilltop, Texas

· 4.2 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Frio County 25 kmZavala County 43 kmLa Salle County 52 kmDimmit County 57 kmMedina County 69 kmUvalde County 77 kmAtascosa County 79 kmMcMullen County 85 kmMaverick County 96 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 2.1 (ml)
Depth
4.2 km below the surface
Felt
no reports yet
Nearest
Frio County, 25 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 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 28.7670, -99.3370. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Frio County, TX 25 km (16 mi) WSW of here earthquakes near Frio County
Zavala County, TX 43 km (26 mi) ESE 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 57 km (35 mi) NE of here earthquakes near Dimmit County
Medina County, TX 69 km (43 mi) SSW of here earthquakes near Medina County
Uvalde County, TX 77 km (48 mi) SSE of here earthquakes near Uvalde County

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

Aftershocks so far

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

  1. 1.5 18 km WSW of Charlotte, Texas
  2. 1.5 21 km SW of Charlotte, Texas
  3. 2.9 10 km E of Dilley, Texas
  4. 1.7 11 km ESE of Pearsall, Texas
  5. 1.6 19 km SW of Charlotte, Texas
  6. 2.7 6 km E of Dilley, Texas
  7. 2.5 11 km ENE of Dilley, Texas
  8. 1.5 19 km SW of Charlotte, Texas
  9. 1.8 24 km E of Dilley, Texas
  10. 1.7 10 km E of Pearsall, Texas
  11. 2.0 16 km SSE of Pearsall, Texas
  12. 2.0 12 km ESE of Pearsall, Texas
  13. 1.8 16 km ENE of Hilltop, Texas
  14. 1.7 11 km SSE of Pearsall, Texas
  15. 1.6 20 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.