QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

6 km SSE of Sweetwater, Tennessee

· 21 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Monroe County 20 kmMcMinn County 21 kmLoudon County 24 kmMeigs County 34 kmRoane County 35 kmRhea County 46 kmPolk County 49 kmBlount County 50 kmCherokee 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
21 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Monroe County, 20 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 573 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× 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 35.5440, -84.4425. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Monroe County, TN 20 km (13 mi) WNW of here earthquakes near Monroe County
McMinn County, TN 21 km (13 mi) NE of here earthquakes near McMinn County
Loudon County, TN 24 km (15 mi) SSW of here earthquakes near Loudon County
Meigs County, TN 34 km (21 mi) E of here earthquakes near Meigs County
Roane County, TN 35 km (21 mi) SSE of here earthquakes near Roane County
Rhea County, TN 46 km (29 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

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

  1. 2.1 5 km S of Sweetwater, Tennessee
  2. 2.2 2 km SSW of Greenback, Tennessee
  3. 1.8 13 km SSE of Greenback, Tennessee
  4. 1.8 4 km E of Madisonville, Tennessee
  5. 2.5 5 km E of Madisonville, Tennessee
  6. 2.0 5 km NNW of Vonore, Tennessee
  7. 2.2 10 km WNW of Philadelphia, Tennessee
  8. 2.2 13 km SE of Greenback, Tennessee
  9. 2.0 14 km SE of Etowah, Tennessee
  10. 1.9 7 km ENE of Etowah, Tennessee
  11. 1.9 7 km ENE of Etowah, Tennessee
  12. 1.9 5 km SSW of Riceville, Tennessee
  13. 2.0 21 km SE of Greenback, Tennessee
  14. 1.8 2 km WNW of Maryville, Tennessee
  15. 1.6 5 km WSW of Friendsville, 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 9,400 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.