QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

3 km NE of Courtland, Alabama

· 7.0 km deep · released about 44 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lawrence County 18 kmLimestone County 30 kmLauderdale County 41 kmColbert County 48 kmMorgan County 48 kmFranklin County 59 kmLawrence County 60 kmWinston County 60 kmGiles County 61 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
7.0 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Lawrence County, 18 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2052 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 44 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 5.8 340,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 240,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 44 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 34.6918, -87.2803. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lawrence County, AL 18 km (11 mi) NNE of here earthquakes near Lawrence County
Limestone County, AL 30 km (19 mi) WSW of here earthquakes near Limestone County
Lauderdale County, AL 41 km (26 mi) SE of here earthquakes near Lauderdale County
Colbert County, AL 48 km (30 mi) E of here earthquakes near Colbert County
Morgan County, AL 48 km (30 mi) WNW of here earthquakes near Morgan County
Franklin County, AL 59 km (36 mi) ENE of here earthquakes near Franklin 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. 2.5 12 km NNE of Trinity, Alabama
  2. 2.3 13 km N of Double Springs, 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.