QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

4 km ESE of Powells Crossroads, Tennessee

· 19 km deep · released about 94 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Marion County 16 kmHamilton County 22 kmSequatchie County 23 kmGrundy County 35 kmDade County 36 kmCatoosa County 41 kmWalker County 50 kmBledsoe County 52 kmBradley County 53 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 2.3 (md)
Depth
19 km below the surface
Felt
no reports yet
Nearest
Marion County, 16 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1809 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 94 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 160,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 110,000× the energy of this one
  3. Around the size people start to feel M 3.0 10× the energy of this one
  4. This earthquake M 2.3 about 94 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 35.1688, -85.4403. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Marion County, TN 16 km (10 mi) ENE of here earthquakes near Marion County
Hamilton County, TN 22 km (13 mi) W of here earthquakes near Hamilton County
Sequatchie County, TN 23 km (14 mi) S of here earthquakes near Sequatchie County
Grundy County, TN 35 km (22 mi) SE of here earthquakes near Grundy County
Dade County, GA 36 km (22 mi) N of here earthquakes near Dade County
Catoosa County, GA 41 km (25 mi) NW of here earthquakes near Catoosa County

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

Aftershocks so far

30 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. 2.0 4 km NNE of Trenton, Georgia
  4. 2.3 3 km S of Lone Oak, Tennessee
  5. 2.4 4 km NW of Cohutta, Georgia
  6. 2.2 6 km WNW of Linwood, Georgia
  7. 1.8 4 km SE of Apison, Tennessee
  8. 2.0 1 km WSW of Collegedale, Tennessee
  9. 1.8 2 km SW of Chickamauga, Georgia
  10. 2.2 2 km S of Ringgold, Georgia
  11. 2.5 4 km N of Tunnel Hill, Georgia
  12. 2.1 10 km SE of Chickamauga, Georgia
  13. 2.2 9 km NNW of Graysville, Tennessee
  14. 2.2 10 km W of Graysville, Tennessee
  15. 1.9 1 km E of Collegedale, Tennessee

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.