QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

13 km W of Graysville, Tennessee

· 23 km deep · released about 98 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Bledsoe County 14 kmSequatchie County 19 kmRhea County 30 kmVan Buren County 33 kmHamilton County 34 kmMeigs County 38 kmGrundy County 44 kmBradley County 49 kmMarion County 51 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
23 km below the surface
Felt
no reports yet
Nearest
Bledsoe County, 14 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 930 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 98 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 5.8 150,000× 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 9.8× the energy of this one
  4. This earthquake M 2.3 about 98 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 35.4687, -85.2342. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Bledsoe County, TN 14 km (9 mi) S of here earthquakes near Bledsoe County
Sequatchie County, TN 19 km (12 mi) NE of here earthquakes near Sequatchie County
Rhea County, TN 30 km (18 mi) WSW of here earthquakes near Rhea County
Van Buren County, TN 33 km (20 mi) SE of here earthquakes near Van Buren County
Hamilton County, TN 34 km (21 mi) N of here earthquakes near Hamilton County
Meigs County, TN 38 km (24 mi) W of here earthquakes near Meigs County

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

Aftershocks so far

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

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

For this area

The largest earthquake within 50 km in our catalogue was M 4.4 on 2018-12-12 — it released about 1,200 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.