QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

10 km S of Spring City, Tennessee

· 20 km deep · released about 22 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Rhea County 7 kmMeigs County 11 kmBledsoe County 30 kmMcMinn County 30 kmCumberland County 40 kmRoane County 42 kmBradley County 50 kmLoudon County 53 kmVan Buren County 54 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 1.9 (md)
Depth
20 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Rhea County, 7 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1096 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 22 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 680,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 480,000× the energy of this one
  3. Around the size people start to feel M 3.0 43× the energy of this one
  4. This earthquake M 1.9 about 22 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 35.6023, -84.8737. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Rhea County, TN 7 km (4 mi) E of here earthquakes near Rhea County
Meigs County, TN 11 km (7 mi) NNW of here earthquakes near Meigs County
Bledsoe County, TN 30 km (19 mi) E of here earthquakes near Bledsoe County
McMinn County, TN 30 km (19 mi) NW of here earthquakes near McMinn County
Cumberland County, TN 40 km (25 mi) SSE of here earthquakes near Cumberland County
Roane County, TN 42 km (26 mi) SW of here earthquakes near Roane County

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

Aftershocks so far

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

  1. 1.8 6 km WSW of Etowah, Tennessee
  2. 2.2 10 km WNW of Philadelphia, Tennessee
  3. 2.0 6 km ENE of Niota, Tennessee
  4. 2.2 2 km W of Dayton, Tennessee
  5. 2.1 4 km NNW of Dayton, Tennessee
  6. 1.8 3 km E of Philadelphia, Tennessee
  7. 2.2 13 km S of Midtown, Tennessee
  8. 1.7 5 km ENE of Niota, Tennessee
  9. 1.8 6 km SW of Decatur, Tennessee
  10. 2.1 3 km NE of Niota, Tennessee
  11. 1.9 5 km SSW of Sweetwater, Tennessee
  12. 2.3 7 km SSE of Charleston, Tennessee
  13. 2.4 4 km E of Athens, Tennessee
  14. 2.2 10 km SSE of Dayton, Tennessee
  15. 1.8 2 km S of Niota, 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 5,400 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.