QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

6 km NNW of Philadelphia, Tennessee

· 8.8 km deep · released about 5.9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Loudon County 11 kmRoane County 15 kmMonroe County 36 kmMcMinn County 38 kmMeigs County 42 kmBlount County 47 kmAnderson County 48 kmRhea County 48 kmMorgan County 49 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 1.5 (md)
Depth
8.8 km below the surface
Felt
no reports yet
Nearest
Loudon County, 11 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1468 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 5.9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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 35.7322, -84.4390. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loudon County, TN 11 km (7 mi) W of here earthquakes near Loudon County
Roane County, TN 15 km (9 mi) SSE of here earthquakes near Roane County
Monroe County, TN 36 km (22 mi) NNW of here earthquakes near Monroe County
McMinn County, TN 38 km (24 mi) NNE of here earthquakes near McMinn County
Meigs County, TN 42 km (26 mi) NE of here earthquakes near Meigs County
Blount County, TN 47 km (29 mi) W of here earthquakes near Blount County

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

Aftershocks so far

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

  1. 2.3 7 km SW of Maryville, Tennessee
  2. 2.0 0 km WSW of Alcoa, Tennessee
  3. 1.8 5 km NNE of Niota, Tennessee
  4. 2.0 5 km S of Englewood, Tennessee
  5. 1.7 2 km SSE of Philadelphia, Tennessee
  6. 1.9 3 km N of Madisonville, Tennessee
  7. 1.8 11 km SW of Tellico Plains, Tennessee
  8. 1.6 7 km W of Tellico Plains, Tennessee
  9. 2.0 5 km NW of Madisonville, Tennessee
  10. 1.6 6 km E of Oak Ridge, Tennessee
  11. 1.8 3 km W of Maryville, Tennessee
  12. 2.0 14 km SE of Vonore, Tennessee
  13. 1.8 4 km WSW of Decatur, Tennessee
  14. 1.6 5 km NNE of Greenback, Tennessee
  15. 2.0 3 km ESE of Etowah, 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 20,000 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.