QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

11 km SE of Ash Flat, Arkansas

· 10 km deep · released about 40 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sharp County 4 kmIzard County 37 kmFulton County 37 kmLawrence County 39 kmIndependence County 47 kmRandolph County 48 kmOregon County 60 kmStone County 66 kmJackson County 68 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
10 km below the surface
Felt
no reports yet
Nearest
Sharp County, 4 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1748 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 40 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 5.8 380,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 270,000× the energy of this one
  3. Around the size people start to feel M 3.0 24× the energy of this one
  4. This earthquake M 2.1 about 40 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 36.1565, -91.5132. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sharp County, AR 4 km (3 mi) WSW of here earthquakes near Sharp County
Izard County, AR 37 km (23 mi) E of here earthquakes near Izard County
Fulton County, AR 37 km (23 mi) SE of here earthquakes near Fulton County
Lawrence County, AR 39 km (24 mi) WNW of here earthquakes near Lawrence County
Independence County, AR 47 km (29 mi) N of here earthquakes near Independence County
Randolph County, AR 48 km (30 mi) WSW of here earthquakes near Randolph County

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

Aftershocks so far

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

  1. 1.9 12 km WNW of Smithville, Arkansas
  2. 1.8 2 km SW of Ravenden, Arkansas
  3. 2.0 5 km N of Black Rock, Arkansas
  4. 2.2 5 km SSW of Strawberry, Arkansas
  5. 1.7 3 km N of Black Rock, Arkansas
  6. 2.2 3 km ESE of Strawberry, Arkansas
  7. 1.7 4 km SSW of Strawberry, Arkansas
  8. 1.7 Arkansas
  9. 1.5 5 km SE of Strawberry, Arkansas
  10. 1.7 4 km SE of Strawberry, Arkansas
  11. 2.5 2 km ESE of Strawberry, Arkansas
  12. 1.6 3 km SSE of Lynn, Arkansas
  13. 2.4 7 km SW of Ravenden, Arkansas
  14. 2.3 7 km SSW of Ravenden, Arkansas
  15. 2.0 4 km SW 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.