QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

6 km NE of Mignon, Alabama

· 10 km deep · released about 49 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Talladega County 16 kmClay County 33 kmCoosa County 33 kmShelby County 42 kmSt. Clair County 56 kmTallapoosa County 56 kmChilton County 64 kmRandolph County 70 kmCalhoun 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 2.1 (md)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Talladega County, 16 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3314 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 49 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 5.8 310,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 220,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 49 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 33.2272, -86.2098. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Talladega County, AL 16 km (10 mi) SSW of here earthquakes near Talladega County
Clay County, AL 33 km (20 mi) W of here earthquakes near Clay County
Coosa County, AL 33 km (21 mi) N of here earthquakes near Coosa County
Shelby County, AL 42 km (26 mi) E of here earthquakes near Shelby County
St. Clair County, AL 56 km (35 mi) S of here earthquakes near St. Clair County
Tallapoosa County, AL 56 km (35 mi) NW of here earthquakes near Tallapoosa 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. 2.3 1 km SE of Talladega, Alabama
  2. 2.0 9 km NNE of Hollins, Alabama

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.