QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

3 km ENE of Philadelphia, Tennessee

· 13 km deep · released about 7.1 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Loudon County 8 kmRoane County 23 kmMonroe County 29 kmMcMinn County 37 kmBlount County 40 kmMeigs County 45 kmAnderson County 50 kmKnox County 52 kmRhea County 53 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 1.6 (md)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Loudon County, 8 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2132 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 7.1 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,500,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.1 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 35.6858, -84.3713. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loudon County, TN 8 km (5 mi) SW of here earthquakes near Loudon County
Roane County, TN 23 km (14 mi) SE of here earthquakes near Roane County
Monroe County, TN 29 km (18 mi) NNW of here earthquakes near Monroe County
McMinn County, TN 37 km (23 mi) NE of here earthquakes near McMinn County
Blount County, TN 40 km (25 mi) W of here earthquakes near Blount County
Meigs County, TN 45 km (28 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

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

  1. 1.6 9 km NNW of Decatur, Tennessee
  2. 1.9 6 km NW of Lenoir City, Tennessee
  3. 2.6 9 km ENE of Garland, Tennessee
  4. 2.4 6 km WNW of Niota, Tennessee
  5. 1.6 2 km ENE of Loudon, Tennessee
  6. 1.8 6 km NW of Vonore, Tennessee
  7. 1.8 5 km SSW of Tellico Village, Tennessee
  8. 1.9 8 km SSE of Etowah, Tennessee
  9. 1.5 12 km ESE of Madisonville, Tennessee
  10. 2.4 7 km NNE of Garland, Tennessee
  11. 1.6 7 km ESE of Vonore, Tennessee
  12. 1.8 4 km W of Athens, Tennessee
  13. 2.0 5 km E of Riceville, Tennessee
  14. 2.5 Tennessee-North Carolina border region
  15. 2.1 10 km NNE of Decatur, 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 17,000 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.