QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

11 km SW of Poth, Texas

· 4.6 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Wilson County 20 kmKarnes County 33 kmAtascosa County 37 kmBexar County 59 kmGuadalupe County 68 kmLive Oak County 73 kmBee County 78 kmDeWitt County 79 kmMcMullen County 80 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
4.6 km below the surface
Felt
no reports yet
Nearest
Wilson County, 20 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 445 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 29.0080, -98.1740. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Wilson County, TX 20 km (13 mi) SSW of here earthquakes near Wilson County
Karnes County, TX 33 km (21 mi) WNW of here earthquakes near Karnes County
Atascosa County, TX 37 km (23 mi) ENE of here earthquakes near Atascosa County
Bexar County, TX 59 km (37 mi) SE of here earthquakes near Bexar County
Guadalupe County, TX 68 km (42 mi) SSW of here earthquakes near Guadalupe County
Live Oak County, TX 73 km (45 mi) N 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

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

  1. 1.8 17 km ENE of Falls City, Texas
  2. 1.5 13 km NNW of Three Rivers, Texas
  3. 1.9 15 km NNW of Three Rivers, Texas
  4. 1.7 14 km NNW of Three Rivers, Texas
  5. 1.7 14 km NW of Three Rivers, Texas
  6. 2.1 15 km NNW of Three Rivers, Texas
  7. 1.7 13 km WNW of Pawnee, Texas
  8. 1.6 13 km WNW of Pawnee, Texas
  9. 1.9 14 km NW of Pawnee, Texas
  10. 2.2 14 km NW of Pawnee, Texas
  11. 1.7 13 km WNW of Pawnee, Texas
  12. 1.7 13 km WNW of Pawnee, Texas
  13. 2.2 13 km NW of Pawnee, Texas
  14. 1.6 14 km WNW of Pawnee, Texas
  15. 1.9 2 km ESE of Falls City, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.0 on 2018-05-01 — it released about 2,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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