QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

7 km SSE of Sewanee, Tennessee

· 8.4 km deep · released about 1,500 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Franklin County 19 kmMarion County 26 kmGrundy County 33 kmCoffee County 42 kmJackson County 43 kmMoore County 46 kmDade County 48 kmSequatchie County 51 kmWarren County 61 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 3.1 (md)
Depth
8.4 km below the surface
Felt
138 reports · strongest reported intensity IV
Nearest
Franklin County, 19 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2250 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 138 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,500 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 230,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 10,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,200× the energy of this one
  4. This earthquake M 3.1 about 1,500 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.6× more

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 35.1405, -85.8918. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Franklin County, TN 19 km (12 mi) E of here earthquakes near Franklin County
Marion County, TN 26 km (16 mi) W of here earthquakes near Marion County
Grundy County, TN 33 km (20 mi) SSW of here earthquakes near Grundy County
Coffee County, TN 42 km (26 mi) SSE of here earthquakes near Coffee County
Jackson County, AL 43 km (26 mi) N of here earthquakes near Jackson County
Moore County, TN 46 km (28 mi) ESE of here earthquakes near Moore County

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

Aftershocks so far

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

  1. 2.4 12 km S of Tracy City, Tennessee
  2. 2.0 4 km NNE of Trenton, Georgia
  3. 2.3 3 km S of Lone Oak, Tennessee
  4. 2.1 6 km SW of Bridgeport, Alabama
  5. 2.3 4 km NE of Stevenson, Alabama
  6. 2.5 7 km ENE of Stevenson, Alabama
  7. 2.5 6 km SSE of Sewanee, Tennessee
  8. 2.2 9 km SE of Palmer, Tennessee
  9. 1.9 5 km SSE of Stevenson, Alabama
  10. 2.3 4 km ESE of Powells Crossroads, Tennessee
  11. 2.3 3 km WSW of Trenton, Georgia
  12. 2.4 10 km NNW of Kimball, Tennessee
  13. 2.8 7 km SSE of Sewanee, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.