QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2md

10 km W of Graysville, Tennessee

· 22 km deep · released about 69 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Bledsoe County 15 kmSequatchie County 21 kmRhea County 28 kmHamilton County 33 kmMeigs County 35 kmVan Buren County 36 kmBradley County 46 kmGrundy County 47 kmMarion County 52 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 2.2 (md)
Depth
22 km below the surface
Felt
no reports yet
Nearest
Bledsoe County, 15 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 863 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 69 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 220,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 150,000× the energy of this one
  3. Around the size people start to feel M 3.0 14× the energy of this one
  4. This earthquake M 2.2 about 69 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 35.4588, -85.1990. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Bledsoe County, TN 15 km (9 mi) S of here earthquakes near Bledsoe County
Sequatchie County, TN 21 km (13 mi) ENE of here earthquakes near Sequatchie County
Rhea County, TN 28 km (17 mi) SW of here earthquakes near Rhea County
Hamilton County, TN 33 km (20 mi) N of here earthquakes near Hamilton County
Meigs County, TN 35 km (22 mi) W of here earthquakes near Meigs County
Van Buren County, TN 36 km (22 mi) SE of here earthquakes near Van Buren County

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

Aftershocks so far

14 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. 2.3 7 km SSE of Charleston, Tennessee
  9. 2.2 10 km SSE of Dayton, Tennessee
  10. 2.3 3 km S of Lone Oak, Tennessee
  11. 2.1 6 km NNE of Hopewell, 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

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 1,700 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.