QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

6 km S of Prattsville, Arkansas

· 9.7 km deep · released about 41 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grant County 12 kmDallas County 34 kmHot Spring County 37 kmSaline County 45 kmCleveland County 52 kmJefferson County 57 kmPulaski County 61 kmClark County 62 kmGarland County 66 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
9.7 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
Grant County, 12 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 841 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 41 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 5.8 370,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 260,000× the energy of this one
  3. Around the size people start to feel M 3.0 23× the energy of this one
  4. This earthquake M 2.1 about 41 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 34.2568, -92.5477. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grant County, AR 12 km (7 mi) WSW of here earthquakes near Grant County
Dallas County, AR 34 km (21 mi) NNE of here earthquakes near Dallas County
Hot Spring County, AR 37 km (23 mi) E of here earthquakes near Hot Spring County
Saline County, AR 45 km (28 mi) SSE of here earthquakes near Saline County
Cleveland County, AR 52 km (32 mi) NW of here earthquakes near Cleveland County
Jefferson County, AR 57 km (35 mi) W of here earthquakes near Jefferson County

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

Aftershocks so far

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

  1. 1.7 4 km SW of Avilla, Arkansas
  2. 2.3 4 km WSW of Avilla, 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.