QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

20 km SW of Charlotte, Texas

· 7.9 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Frio County 28 kmAtascosa County 36 kmMcMullen County 48 kmLa Salle County 49 kmMedina County 73 kmLive Oak County 83 kmBexar County 86 kmZavala County 89 kmWilson County 90 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
7.9 km below the surface
Felt
no reports yet
Nearest
Frio County, 28 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 408 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 28.7360, -98.8610. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Frio County, TX 28 km (18 mi) ESE of here earthquakes near Frio County
Atascosa County, TX 36 km (22 mi) WSW of here earthquakes near Atascosa County
McMullen County, TX 48 km (30 mi) NW of here earthquakes near McMullen County
La Salle County, TX 49 km (30 mi) NNE of here earthquakes near La Salle County
Medina County, TX 73 km (45 mi) SSE of here earthquakes near Medina County
Live Oak County, TX 83 km (52 mi) WNW of here earthquakes near Live Oak 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. 1.6 8 km S of Pearsall, Texas
  2. 1.8 23 km NNW of Fowlerton, Texas
  3. 1.7 7 km SE of Pearsall, Texas
  4. 1.7 7 km S of Pearsall, Texas
  5. 1.8 11 km S of Pearsall, Texas
  6. 1.6 7 km S of Pearsall, Texas
  7. 1.8 10 km SSW of Pearsall, Texas
  8. 1.7 9 km S of Pearsall, Texas
  9. 1.6 1 km NNE of Pearsall, Texas
  10. 2.2 6 km SSW of Pearsall, Texas
  11. 1.7 7 km S of Pearsall, Texas
  12. 2.0 6 km SSW of Pearsall, Texas
  13. 1.7 6 km S of Pearsall, Texas
  14. 1.7 7 km S of Pearsall, Texas
  15. 2.1 10 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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