QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

4 km NNW of Greenbrier, Arkansas

· 6.4 km deep · released about 450 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Faulkner County 15 kmConway County 26 kmVan Buren County 36 kmCleburne County 51 kmPulaski County 56 kmWhite County 59 kmPerry County 60 kmPope County 60 kmStone County 70 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 2.8 (md)
Depth
6.4 km below the surface
Felt
56 reports · strongest reported intensity IV
Nearest
Faulkner County, 15 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1536 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 56 people have reported feeling it to USGS.

How big was it?

This earthquake released about 450 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 34,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 24,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.1× the energy of this one
  4. This earthquake M 2.8 about 450 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 35.2688, -92.4045. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Faulkner County, AR 15 km (9 mi) NNW of here earthquakes near Faulkner County
Conway County, AR 26 km (16 mi) E of here earthquakes near Conway County
Van Buren County, AR 36 km (23 mi) SSE of here earthquakes near Van Buren County
Cleburne County, AR 51 km (32 mi) SW of here earthquakes near Cleburne County
Pulaski County, AR 56 km (35 mi) N of here earthquakes near Pulaski County
White County, AR 59 km (37 mi) W of here earthquakes near White County

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

Aftershocks so far

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

  1. 2.3 3 km NW of Mount Vernon, Arkansas
  2. 1.7 8 km SW of Heber Springs, Arkansas
  3. 2.3 3 km NE of Greenbrier, Arkansas
  4. 2.0 3 km SSE of Guy, Arkansas
  5. 2.4 11 km W of Clinton, Arkansas
  6. 1.8 2 km WNW of Enola, Arkansas
  7. 2.2 10 km WSW of Center Ridge, Arkansas
  8. 1.9 5 km W of Damascus, Arkansas
  9. 2.1 5 km NNE of Greenbrier, Arkansas
  10. 2.0 Arkansas
  11. 2.3 6 km ESE of Center Ridge, Arkansas
  12. 1.7 1 km ENE of Enola, Arkansas
  13. 1.6 3 km WNW of Greenbrier, Arkansas
  14. 1.8 9 km WSW of Center Ridge, Arkansas
  15. 2.4 10 km NE of Damascus, Arkansas

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

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