QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

9 km NNW of Hilltop, Texas

· 2.7 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Frio County 16 kmLa Salle County 48 kmZavala County 53 kmDimmit County 65 kmMedina County 66 kmAtascosa County 68 kmMcMullen County 76 kmUvalde County 84 kmBexar County 102 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
2.7 km below the surface
Felt
no reports yet
Nearest
Frio County, 16 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 384 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 28.7670, -99.2240. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Frio County, TX 16 km (10 mi) SW of here earthquakes near Frio County
La Salle County, TX 48 km (30 mi) NNW of here earthquakes near La Salle County
Zavala County, TX 53 km (33 mi) ESE of here earthquakes near Zavala County
Dimmit County, TX 65 km (41 mi) NE of here earthquakes near Dimmit County
Medina County, TX 66 km (41 mi) S of here earthquakes near Medina County
Atascosa County, TX 68 km (43 mi) WSW of here earthquakes near Atascosa County

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

Aftershocks so far

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

  1. 1.6 10 km SSE of Pearsall, Texas
  2. 1.7 10 km SSE of Pearsall, Texas
  3. 2.1 8 km SE of Pearsall, Texas
  4. 1.9 7 km SSE of Pearsall, Texas
  5. 1.5 9 km SSE of Pearsall, Texas
  6. 1.9 11 km S of Pearsall, Texas
  7. 2.3 12 km ENE of Hilltop, Texas
  8. 1.6 13 km SSE of Pearsall, Texas
  9. 1.8 11 km SSE of Pearsall, Texas
  10. 1.5 7 km SSE of Pearsall, Texas
  11. 1.8 19 km SW of Charlotte, Texas
  12. 1.6 8 km S of Pearsall, Texas
  13. 1.8 23 km NNW of Fowlerton, Texas
  14. 1.7 7 km SE of Pearsall, Texas
  15. 1.7 7 km S of Pearsall, 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

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