QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

10 km ESE of Pearsall, Texas

· 8.9 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Frio County 11 kmAtascosa County 46 kmLa Salle County 56 kmMedina County 57 kmMcMullen County 66 kmZavala County 74 kmBexar County 82 kmDimmit County 88 kmUvalde County 93 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
8.9 km below the surface
Felt
no reports yet
Nearest
Frio County, 11 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 208 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 28.8470, -99.0010. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Frio County, TX 11 km (7 mi) ESE of here earthquakes near Frio County
Atascosa County, TX 46 km (28 mi) W of here earthquakes near Atascosa County
La Salle County, TX 56 km (35 mi) N of here earthquakes near La Salle County
Medina County, TX 57 km (36 mi) S of here earthquakes near Medina County
McMullen County, TX 66 km (41 mi) NW of here earthquakes near McMullen County
Zavala County, TX 74 km (46 mi) E of here earthquakes near Zavala 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. 1.6 5 km SE of Pearsall, Texas
  2. 1.9 6 km E of North Pearsall, Texas
  3. 1.9 7 km SE of Pearsall, Texas
  4. 1.7 6 km ENE of Pearsall, Texas
  5. 1.8 5 km ENE of Pearsall, Texas
  6. 1.8 8 km SE of Pearsall, Texas
  7. 2.1 11 km SSE of Pearsall, Texas
  8. 2.0 7 km E of North Pearsall, Texas
  9. 1.5 8 km ESE of Pearsall, Texas
  10. 1.6 7 km ESE of Pearsall, Texas
  11. 2.0 4 km SE of Pearsall, Texas
  12. 1.8 8 km SE of Pearsall, Texas
  13. 1.5 6 km SE of Pearsall, Texas
  14. 1.5 7 km SE of Pearsall, Texas
  15. 2.4 5 km ESE 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

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