QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

7 km SSW of O'Kean, Arkansas

· 10 km deep · released about 680 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lawrence County 23 kmGreene County 26 kmRandolph County 29 kmCraighead County 38 kmClay County 48 kmSharp County 56 kmRipley County 59 kmPoinsett County 63 kmJackson County 67 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 2.9 (md)
Depth
10 km below the surface
Felt
31 reports · strongest reported intensity VI
Nearest
Lawrence County, 23 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2157 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 31 people have reported feeling it to USGS.

How big was it?

This earthquake released about 680 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 22,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 16,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.4× the energy of this one
  4. This earthquake M 2.9 about 680 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 36.1158, -90.8570. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lawrence County, AR 23 km (15 mi) ENE of here earthquakes near Lawrence County
Greene County, AR 26 km (16 mi) W of here earthquakes near Greene County
Randolph County, AR 29 km (18 mi) SSE of here earthquakes near Randolph County
Craighead County, AR 38 km (24 mi) NNW of here earthquakes near Craighead County
Clay County, AR 48 km (30 mi) SW of here earthquakes near Clay County
Sharp County, AR 56 km (34 mi) E of here earthquakes near Sharp County

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

Aftershocks so far

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

  1. 2.1 2 km SE of Ravenden, Arkansas
  2. 1.9 3 km ESE of Ravenden, Arkansas
  3. 1.8 Missouri-Arkansas border region
  4. 1.9 8 km SSE of Williford, Arkansas
  5. 2.1 7 km SW of Ravenden, Arkansas
  6. 1.7 6 km SW of Ravenden, Arkansas
  7. 1.9 6 km SSE of Williford, Arkansas
  8. 2.3 8 km SSE of Williford, Arkansas
  9. 2.4 7 km SSE of Williford, Arkansas
  10. 2.2 4 km WNW of Powhatan, Arkansas
  11. 2.1 5 km WNW of Powhatan, Arkansas
  12. 2.1 6 km WNW of Powhatan, Arkansas
  13. 1.6 4 km NE of Black Rock, Arkansas
  14. 1.8 5 km WNW of Powhatan, Arkansas
  15. 1.5 5 km WNW of Powhatan, 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.