QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

4 km SW of Sweetwater, Tennessee

· 27 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N McMinn County 20 kmLoudon County 24 kmMonroe County 27 kmMeigs County 30 kmRoane County 30 kmRhea County 41 kmPolk County 52 kmBlount County 53 kmBradley County 57 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
27 km below the surface
Felt
3 reports · strongest reported intensity II
Nearest
McMinn County, 20 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1361 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 13 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 810,000× the energy of this one
  3. Around the size people start to feel M 3.0 72× the energy of this one
  4. This earthquake M 1.8 about 13 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 35.5778, -84.4965. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
McMinn County, TN 20 km (13 mi) NNE of here earthquakes near McMinn County
Loudon County, TN 24 km (15 mi) SW of here earthquakes near Loudon County
Monroe County, TN 27 km (17 mi) WNW of here earthquakes near Monroe County
Meigs County, TN 30 km (19 mi) ENE of here earthquakes near Meigs County
Roane County, TN 30 km (19 mi) S of here earthquakes near Roane County
Rhea County, TN 41 km (26 mi) E of here earthquakes near Rhea County

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

Aftershocks so far

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

  1. 2.3 7 km SW of Maryville, Tennessee
  2. 1.8 5 km NNE of Niota, Tennessee
  3. 2.0 5 km S of Englewood, Tennessee
  4. 1.7 2 km SSE of Philadelphia, Tennessee
  5. 1.9 3 km N of Madisonville, Tennessee
  6. 1.8 11 km SW of Tellico Plains, Tennessee
  7. 1.6 7 km W of Tellico Plains, Tennessee
  8. 1.9 11 km SE of Tellico Plains, Tennessee
  9. 2.0 5 km NW of Madisonville, Tennessee
  10. 1.8 3 km W of Maryville, Tennessee
  11. 2.0 14 km SE of Vonore, Tennessee
  12. 1.8 4 km WSW of Decatur, Tennessee
  13. 1.6 5 km NNE of Greenback, Tennessee
  14. 2.0 3 km ESE of Etowah, Tennessee
  15. 1.8 8 km E of Englewood, 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 9,100 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.