QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

17 km SE of Pearsall, Texas

· 6.8 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Frio County 17 kmAtascosa County 45 kmLa Salle County 48 kmMcMullen County 58 kmMedina County 66 kmZavala County 77 kmDimmit County 86 kmBexar County 87 kmLive Oak 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 1.8 (ml)
Depth
6.8 km below the surface
Felt
no reports yet
Nearest
Frio County, 17 km NW
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 28.7730, -98.9790. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Frio County, TX 17 km (10 mi) SE of here earthquakes near Frio County
Atascosa County, TX 45 km (28 mi) WSW of here earthquakes near Atascosa County
La Salle County, TX 48 km (30 mi) NNE of here earthquakes near La Salle County
McMullen County, TX 58 km (36 mi) NW of here earthquakes near McMullen County
Medina County, TX 66 km (41 mi) SSE of here earthquakes near Medina County
Zavala County, TX 77 km (48 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

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

  1. 2.4 10 km ENE of Gardendale, Texas
  2. 2.0 9 km NE of Gardendale, Texas
  3. 1.8 11 km SE of Dilley, Texas
  4. 2.0 9 km ENE of Gardendale, Texas
  5. 1.6 10 km S of Pearsall, Texas
  6. 1.6 8 km S of Pearsall, Texas
  7. 1.8 3 km NNE of Hilltop, Texas
  8. 2.2 11 km E of Pearsall, Texas
  9. 1.7 11 km E of North Pearsall, Texas
  10. 2.0 21 km NNW of Fowlerton, Texas
  11. 1.7 10 km E of Pearsall, Texas
  12. 2.0 11 km E of Pearsall, Texas
  13. 1.7 10 km S of Pearsall, Texas
  14. 2.5 12 km E of Pearsall, Texas
  15. 1.6 9 km E of Dilley, 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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