QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

6 km SW of Bridgeport, Alabama

· 8.2 km deep · released about 44 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Dade County 24 kmJackson County 25 kmMarion County 29 kmFranklin County 41 kmWalker County 46 kmDeKalb County 49 kmGrundy County 55 kmCatoosa County 57 kmHamilton County 59 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
8.2 km below the surface
Felt
no reports yet
Nearest
Dade County, 24 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 942 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 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 34.9037, -85.7655. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Dade County, GA 24 km (15 mi) WNW of here earthquakes near Dade County
Jackson County, AL 25 km (16 mi) NE of here earthquakes near Jackson County
Marion County, TN 29 km (18 mi) SSW of here earthquakes near Marion County
Franklin County, TN 41 km (26 mi) SE of here earthquakes near Franklin County
Walker County, GA 46 km (29 mi) WNW of here earthquakes near Walker County
DeKalb County, AL 49 km (31 mi) N of here earthquakes near DeKalb County

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

Aftershocks so far

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

  1. 2.1 11 km ESE of Trenton, Georgia
  2. 2.4 12 km S of Tracy City, Tennessee
  3. 2.4 4 km SW of LaFayette, Georgia
  4. 1.7 6 km W of Linwood, Georgia
  5. 2.3 6 km WSW of Linwood, Georgia
  6. 2.0 4 km NNE of Trenton, Georgia
  7. 2.3 3 km S of Lone Oak, Tennessee
  8. 2.2 6 km WNW of Linwood, Georgia
  9. 2.2 8 km N of Menlo, Georgia
  10. 2.6 8 km N of Menlo, Georgia
  11. 2.3 6 km WSW of Linwood, Georgia
  12. 1.8 2 km SW of Chickamauga, Georgia
  13. 2.3 0 km NNE of Section, 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.