QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

4 km WSW of Graysville, Tennessee

· 13 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Bledsoe County 19 kmRhea County 25 kmSequatchie County 26 kmMeigs County 30 kmHamilton County 31 kmBradley County 40 kmVan Buren County 41 kmMcMinn County 47 kmGrundy 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 1.8 (md)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Bledsoe County, 19 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2487 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 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 930,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
  3. Around the size people start to feel M 3.0 59× the energy of this one
  4. This earthquake M 1.8 about 16 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 35.4333, -85.1365. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Bledsoe County, TN 19 km (12 mi) SSE of here earthquakes near Bledsoe County
Rhea County, TN 25 km (16 mi) SW of here earthquakes near Rhea County
Sequatchie County, TN 26 km (16 mi) ENE of here earthquakes near Sequatchie County
Meigs County, TN 30 km (19 mi) WSW of here earthquakes near Meigs County
Hamilton County, TN 31 km (19 mi) N of here earthquakes near Hamilton 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. 2.3 3 km S of Lone Oak, Tennessee
  2. 2.1 6 km NNE of Hopewell, Tennessee
  3. 2.0 1 km WSW of Collegedale, Tennessee
  4. 1.6 9 km SW of Spring City, Tennessee
  5. 2.2 9 km NNW of Graysville, Tennessee
  6. 2.2 10 km W of Graysville, Tennessee
  7. 1.8 4 km WSW of Decatur, Tennessee
  8. 1.9 1 km E of Collegedale, Tennessee
  9. 2.6 14 km W of Graysville, Tennessee
  10. 2.3 13 km W of Graysville, Tennessee
  11. 2.1 13 km W of Graysville, Tennessee
  12. 2.6 9 km NNW of Graysville, Tennessee
  13. 2.2 3 km ENE of East Brainerd, Tennessee
  14. 2.0 10 km NNW of Dayton, Tennessee
  15. 2.4 9 km WNW of Hopewell, 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 7,400 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.