QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

21 km NNW of Fowlerton, Texas

· 8.7 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Frio County 34 kmLa Salle County 40 kmMcMullen County 41 kmAtascosa County 42 kmLive Oak County 80 kmMedina County 82 kmZavala County 90 kmDimmit County 91 kmBexar County 95 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
8.7 km below the surface
Felt
no reports yet
Nearest
Frio County, 34 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 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 28.6510, -98.8710. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Frio County, TX 34 km (21 mi) SE of here earthquakes near Frio County
La Salle County, TX 40 km (25 mi) NNE of here earthquakes near La Salle County
McMullen County, TX 41 km (26 mi) NW of here earthquakes near McMullen County
Atascosa County, TX 42 km (26 mi) SW of here earthquakes near Atascosa County
Live Oak County, TX 80 km (50 mi) WNW of here earthquakes near Live Oak County
Medina County, TX 82 km (51 mi) SSE of here earthquakes near Medina 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 15 km SSE of Pearsall, Texas
  2. 1.6 23 km NNW of Fowlerton, Texas
  3. 1.8 17 km SE of Pearsall, Texas
  4. 2.1 14 km SE of Pearsall, Texas
  5. 1.8 19 km ESE of Pearsall, Texas
  6. 1.7 12 km ESE of Pearsall, Texas
  7. 1.9 13 km SE of Pearsall, Texas
  8. 2.2 23 km NNW of Fowlerton, Texas
  9. 2.1 11 km SE of Pearsall, Texas
  10. 1.7 14 km SE of Pearsall, Texas
  11. 1.7 20 km NNW of Fowlerton, Texas
  12. 2.0 9 km ESE of Pearsall, Texas
  13. 1.5 10 km ESE of Pearsall, Texas
  14. 1.7 16 km SE of Pearsall, Texas
  15. 2.3 23 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

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