QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

9 km SW of Brinkley, Arkansas

· 8.3 km deep · released about 40 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Monroe County 17 kmPrairie County 26 kmWoodruff County 41 kmLee County 45 kmSt. Francis County 52 kmLonoke County 58 kmPhillips County 58 kmArkansas County 61 kmWhite County 65 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
Monroe County, 17 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 983 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 34.8267, -91.2658. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Monroe County, AR 17 km (11 mi) NNW of here earthquakes near Monroe County
Prairie County, AR 26 km (16 mi) E of here earthquakes near Prairie County
Woodruff County, AR 41 km (25 mi) S of here earthquakes near Woodruff County
Lee County, AR 45 km (28 mi) W of here earthquakes near Lee County
St. Francis County, AR 52 km (32 mi) WSW of here earthquakes near St. Francis County
Lonoke County, AR 58 km (36 mi) E of here earthquakes near Lonoke County

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

Aftershocks so far

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

  1. 2.0 10 km WNW of Cotton Plant, Arkansas
  2. 2.1 3 km SW of Georgetown, Arkansas
  3. 1.9 8 km NNW of Cotton Plant, Arkansas
  4. 1.7 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.