QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

9 km ESE of Ash Flat, Arkansas

· 14 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sharp County 4 kmFulton County 35 kmIzard County 37 kmLawrence County 40 kmRandolph County 47 kmIndependence County 50 kmOregon County 57 kmStone County 67 kmJackson 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 1.8 (md)
Depth
14 km below the surface
Felt
no reports yet
Nearest
Sharp County, 4 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 297 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× the energy of this one
  4. This earthquake M 1.8 about 15 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 36.1830, -91.5137. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sharp County, AR 4 km (2 mi) WNW of here earthquakes near Sharp County
Fulton County, AR 35 km (22 mi) SE of here earthquakes near Fulton County
Izard County, AR 37 km (23 mi) ENE of here earthquakes near Izard County
Lawrence County, AR 40 km (25 mi) WNW of here earthquakes near Lawrence County
Randolph County, AR 47 km (29 mi) WSW of here earthquakes near Randolph County
Independence County, AR 50 km (31 mi) N of here earthquakes near Independence County

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

Aftershocks so far

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

  1. 1.9 2 km N of Strawberry, Arkansas
  2. 1.7 3 km NW of Mount Pleasant, Arkansas
  3. 1.8 3 km NW of Mount Pleasant, Arkansas
  4. 2.4 4 km WNW of Mount Pleasant, Arkansas
  5. 2.1 3 km NW of Mount Pleasant, Arkansas
  6. 2.2 3 km N of Strawberry, Arkansas
  7. 1.6 3 km NE of Strawberry, Arkansas
  8. 1.8 4 km NNW of Strawberry, Arkansas
  9. 1.6 3 km N of Strawberry, Arkansas
  10. 1.9 3 km N of Strawberry, Arkansas
  11. 2.1 5 km SSW of Strawberry, Arkansas
  12. 1.9 9 km SW of Koshkonong, Missouri
  13. 2.2 2 km W of Lynn, Arkansas
  14. 1.8 2 km SW of Lynn, Arkansas
  15. 1.8 2 km W of Lynn, 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.