QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

11 km NW of Huntsville, Tennessee

· 15 km deep · released about 47 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Loudon County 14 kmRoane County 15 kmAnderson County 33 kmMorgan County 40 kmKnox County 41 kmBlount County 43 kmMonroe County 46 kmMcMinn County 53 kmMeigs County 56 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 2.1 (md)
Depth
15 km below the surface
Felt
12 reports · strongest reported intensity III
Nearest
Loudon County, 14 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2633 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 12 people have reported feeling it to USGS.

How big was it?

This earthquake released about 47 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 320,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 20× the energy of this one
  4. This earthquake M 2.1 about 47 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 35.8550, -84.3580. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loudon County, TN 14 km (9 mi) NNW of here earthquakes near Loudon County
Roane County, TN 15 km (9 mi) E of here earthquakes near Roane County
Anderson County, TN 33 km (20 mi) SSW of here earthquakes near Anderson County
Morgan County, TN 40 km (25 mi) SE of here earthquakes near Morgan County
Knox County, TN 41 km (25 mi) WSW of here earthquakes near Knox County
Blount County, TN 43 km (27 mi) WNW of here earthquakes near Blount County

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

Aftershocks so far

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

  1. 2.5 11 km SSW of Maryville, Tennessee
  2. 2.5 7 km SE of Maryville, Tennessee
  3. 2.0 3 km SSW of Loudon, Tennessee
  4. 2.1 6 km S of Sweetwater, Tennessee
  5. 1.9 Tennessee
  6. 1.5 4 km WSW of Tellico Village, Tennessee
  7. 2.0 11 km SE of Vonore, Tennessee
  8. 1.9 3 km NNE of Madisonville, Tennessee
  9. 1.9 3 km ESE of Loudon, Tennessee
  10. 2.3 6 km NNE of Oakdale, Tennessee
  11. 1.9 8 km WSW of Petros, Tennessee
  12. 2.0 5 km NNE of Tellico Plains, Tennessee
  13. 1.6 11 km SW of Rockwood, Tennessee
  14. 2.3 12 km SW of Rockwood, Tennessee
  15. 1.8 3 km SW of Sweetwater, 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 2,500 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.