QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4md

16 km E of Spring City, Tennessee

· 20 km deep · released about 100 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Roane County 23 kmMeigs County 23 kmRhea County 26 kmMcMinn County 29 kmLoudon County 33 kmCumberland County 41 kmMonroe County 47 kmBledsoe County 49 kmMorgan 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 2.4 (md)
Depth
20 km below the surface
Felt
11 reports · strongest reported intensity IV
Nearest
Roane County, 23 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2077 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 11 people have reported feeling it to USGS.

How big was it?

This earthquake released about 100 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 140,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 100,000× the energy of this one
  3. Around the size people start to feel M 3.0 9.1× the energy of this one
  4. This earthquake M 2.4 about 100 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 35.6847, -84.6765. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Roane County, TN 23 km (14 mi) SW of here earthquakes near Roane County
Meigs County, TN 23 km (14 mi) NNE of here earthquakes near Meigs County
Rhea County, TN 26 km (16 mi) ENE of here earthquakes near Rhea County
McMinn County, TN 29 km (18 mi) N of here earthquakes near McMinn County
Loudon County, TN 33 km (21 mi) W of here earthquakes near Loudon County
Cumberland County, TN 41 km (26 mi) SE of here earthquakes near Cumberland County

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

Aftershocks so far

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

  1. 1.8 Tennessee
  2. 1.8 4 km NE of Vonore, Tennessee
  3. 2.2 4 km ENE of Madisonville, Tennessee
  4. 2.0 1 km ENE of Dayton, Tennessee
  5. 1.8 4 km SW of Sweetwater, Tennessee
  6. 2.0 Tennessee
  7. 1.9 8 km SSE of Vonore, Tennessee
  8. 2.5 7 km WSW of Tellico Plains, Tennessee
  9. 1.5 6 km NNW of Philadelphia, Tennessee
  10. 1.9 6 km E of Vonore, Tennessee
  11. 1.9 15 km WNW of Sweetwater, Tennessee
  12. 1.5 5 km E of Niota, Tennessee
  13. 2.0 11 km NNE of Tellico Plains, Tennessee
  14. 2.0 8 km SSE of Vonore, Tennessee
  15. 1.5 7 km ESE of Calhoun, 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 1,100 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.