QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

17 km SW of Falls City, Texas

· 7.7 km deep · released about 340 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Karnes County 28 kmWilson County 35 kmAtascosa County 39 kmLive Oak County 56 kmBee County 62 kmMcMullen County 68 kmGoliad County 72 kmBexar County 76 kmDeWitt County 79 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 2.7 (ml)
Depth
7.7 km below the surface
Felt
no reports yet
Nearest
Karnes County, 28 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 452 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 28.8590, -98.1340. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Karnes County, TX 28 km (17 mi) WSW of here earthquakes near Karnes County
Wilson County, TX 35 km (22 mi) S of here earthquakes near Wilson County
Atascosa County, TX 39 km (24 mi) E of here earthquakes near Atascosa County
Live Oak County, TX 56 km (35 mi) N of here earthquakes near Live Oak County
Bee County, TX 62 km (39 mi) NW of here earthquakes near Bee County
McMullen County, TX 68 km (42 mi) NE of here earthquakes near McMullen County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 1.5 8 km N of Three Rivers, Texas
  2. 1.5 14 km W of Pawnee, Texas
  3. 2.1 16 km ENE of Falls City, Texas
  4. 2.5 18 km S of Nixon, Texas
  5. 1.8 19 km ENE of Falls City, Texas
  6. 2.0 26 km E of Christine, Texas
  7. 1.7 26 km NW of Pawnee, Texas
  8. 1.7 6 km ENE of Charlotte, Texas
  9. 1.9 7 km ENE of Charlotte, Texas
  10. 1.5 17 km S of Nixon, Texas
  11. 2.0 17 km S of Nixon, Texas
  12. 2.2 18 km S of Nixon, Texas
  13. 1.6 15 km S of Nixon, Texas
  14. 1.6 16 km S of Nixon, Texas
  15. 2.0 16 km S of Nixon, 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 89 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.