QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

4 km SSW of Loudon, Tennessee

· 20 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Loudon County 6 kmRoane County 23 kmMonroe County 29 kmBlount County 38 kmMcMinn County 39 kmMeigs County 47 kmAnderson County 49 kmKnox County 50 kmRhea County 55 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
20 km below the surface
Felt
no reports yet
Nearest
Loudon County, 6 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 983 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 17 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 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× the energy of this one
  4. This earthquake M 1.8 about 17 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 35.6922, -84.3485. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loudon County, TN 6 km (4 mi) SSW of here earthquakes near Loudon County
Roane County, TN 23 km (15 mi) SE of here earthquakes near Roane County
Monroe County, TN 29 km (18 mi) NNW of here earthquakes near Monroe County
Blount County, TN 38 km (24 mi) W of here earthquakes near Blount County
McMinn County, TN 39 km (24 mi) NE of here earthquakes near McMinn County
Meigs County, TN 47 km (29 mi) ENE of here earthquakes near Meigs County

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

Aftershocks so far

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

  1. 1.8 2 km NE of Greenback, Tennessee
  2. 2.1 16 km SE of Vonore, Tennessee
  3. 2.2 4 km N of Englewood, Tennessee
  4. 1.9 2 km NE of Greenback, Tennessee
  5. 2.3 2 km NE of Greenback, Tennessee
  6. 2.0 6 km ENE of Etowah, Tennessee
  7. 1.7 4 km ENE of Niota, Tennessee
  8. 2.1 3 km ENE of Niota, Tennessee
  9. 2.1 6 km E of Friendsville, Tennessee
  10. 1.7 6 km SSE of Friendsville, Tennessee
  11. 1.6 16 km SE of Vonore, Tennessee
  12. 1.8 4 km SSW of Tellico Village, Tennessee
  13. 1.9 1 km WNW of Tellico Village, Tennessee
  14. 2.3 1 km NW of Niota, Tennessee
  15. 1.7 7 km SW of Maryville, 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 7,200 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.