QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

0 km NNE of Augusta, Arkansas

· 8.3 km deep · released about 44 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Woodruff County 15 kmWhite County 36 kmJackson County 36 kmIndependence County 53 kmPrairie County 54 kmCross County 54 kmSt. Francis County 63 kmCleburne County 68 kmPoinsett County 69 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 (md)
Depth
8.3 km below the surface
Felt
no reports yet
Nearest
Woodruff County, 15 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3850 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 44 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 5.8 340,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 240,000× 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 44 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 35.2892, -91.3623. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Woodruff County, AR 15 km (9 mi) NW of here earthquakes near Woodruff County
White County, AR 36 km (22 mi) E of here earthquakes near White County
Jackson County, AR 36 km (23 mi) SSW of here earthquakes near Jackson County
Independence County, AR 53 km (33 mi) SSE of here earthquakes near Independence County
Prairie County, AR 54 km (33 mi) NNE of here earthquakes near Prairie County
Cross County, AR 54 km (34 mi) W of here earthquakes near Cross County

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

Aftershocks so far

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

  1. 2.3 13 km SSW of Pleasant Plains, Arkansas
  2. 2.0 11 km S of Pleasant Plains, Arkansas
  3. 2.2 11 km SSW of Pleasant Plains, Arkansas
  4. 1.9 11 km SSW of Pleasant Plains, Arkansas
  5. 2.2 12 km SSW of Pleasant Plains, Arkansas
  6. 1.9 11 km SSW of Pleasant Plains, Arkansas
  7. 1.9 13 km SSW of Pleasant Plains, Arkansas
  8. 2.1 11 km SW of Pleasant Plains, Arkansas
  9. 1.7 11 km SSW of Pleasant Plains, Arkansas
  10. 2.1 12 km SSW of Pleasant Plains, Arkansas
  11. 2.3 12 km ENE of Pangburn, Arkansas
  12. 2.0 10 km WNW of Cotton Plant, Arkansas
  13. 2.3 9 km NW of Judsonia, Arkansas
  14. 2.2 12 km SSW of Pleasant Plains, Arkansas
  15. 1.8 11 km S of Pleasant Plains, 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.