QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

4 km NNW of Flat Top Mountain, Tennessee

· 18 km deep · released about 74 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sequatchie County 18 kmHamilton County 23 kmBledsoe County 25 kmRhea County 35 kmMeigs County 39 kmBradley County 40 kmVan Buren County 43 kmMarion County 45 kmGrundy County 45 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
18 km below the surface
Felt
no reports yet
Nearest
Sequatchie County, 18 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2171 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 74 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 5.8 200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 140,000× the energy of this one
  3. Around the size people start to feel M 3.0 13× the energy of this one
  4. This earthquake M 2.3 about 74 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 35.3668, -85.2135. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sequatchie County, TN 18 km (11 mi) E of here earthquakes near Sequatchie County
Hamilton County, TN 23 km (14 mi) N of here earthquakes near Hamilton County
Bledsoe County, TN 25 km (16 mi) S of here earthquakes near Bledsoe County
Rhea County, TN 35 km (22 mi) SW of here earthquakes near Rhea County
Meigs County, TN 39 km (25 mi) WSW of here earthquakes near Meigs County
Bradley County, TN 40 km (25 mi) NW of here earthquakes near Bradley County

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

Aftershocks so far

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

  1. 2.0 6 km WSW of Riceville, Tennessee
  2. 1.9 5 km SSW of Riceville, Tennessee
  3. 2.2 2 km W of Dayton, Tennessee
  4. 2.1 4 km NNW of Dayton, Tennessee
  5. 1.8 6 km SW of Decatur, Tennessee
  6. 2.3 7 km SSE of Charleston, Tennessee
  7. 2.2 10 km SSE of Dayton, Tennessee
  8. 2.3 3 km S of Lone Oak, Tennessee
  9. 2.1 6 km NNE of Hopewell, Tennessee
  10. 2.4 4 km NW of Cohutta, Georgia
  11. 1.8 4 km SE of Apison, Tennessee
  12. 2.0 1 km WSW of Collegedale, Tennessee
  13. 1.6 9 km SW of Spring City, Tennessee
  14. 2.2 9 km NNW of Graysville, Tennessee
  15. 2.2 10 km W of Graysville, 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.