QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

5 km WNW of Smithville, Arkansas

· 18 km deep · released about 430 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sharp County 13 kmLawrence County 24 kmRandolph County 40 kmIndependence County 44 kmIzard County 50 kmFulton County 51 kmJackson County 58 kmOregon County 65 kmGreene County 72 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
18 km below the surface
Felt
16 reports · strongest reported intensity III
Nearest
Sharp County, 13 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2983 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 16 people have reported feeling it to USGS.

How big was it?

This earthquake released about 430 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 35,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 25,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.2× the energy of this one
  4. This earthquake M 2.8 about 430 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 36.1028, -91.3620. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sharp County, AR 13 km (8 mi) SE of here earthquakes near Sharp County
Lawrence County, AR 24 km (15 mi) WNW of here earthquakes near Lawrence County
Randolph County, AR 40 km (25 mi) SW of here earthquakes near Randolph County
Independence County, AR 44 km (28 mi) NNE of here earthquakes near Independence County
Izard County, AR 50 km (31 mi) E of here earthquakes near Izard County
Fulton County, AR 51 km (32 mi) SE of here earthquakes near Fulton County

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

Aftershocks so far

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

  1. 1.5 4 km NE of Black Rock, Arkansas
  2. 1.7 3 km WNW of Powhatan, Arkansas
  3. 1.6 5 km N of Black Rock, Arkansas
  4. 1.8 4 km WNW of Powhatan, Arkansas
  5. 2.1 4 km NW of Mount Pleasant, Arkansas
  6. 2.3 Missouri-Arkansas border region
  7. 2.1 5 km N of Black Rock, Arkansas
  8. 2.1 12 km ESE of Mammoth Spring, Arkansas
  9. 1.9 8 km NW of Smithville, Arkansas
  10. 1.8 6 km S of Ravenden, Arkansas
  11. 2.9 7 km SSW of O'Kean, Arkansas
  12. 2.3 10 km NNE of Newark, Arkansas
  13. 2.1 9 km SW of Mammoth Spring, Arkansas
  14. 2.3 8 km N of Williford, Arkansas
  15. 2.3 4 km SE of Imboden, 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.