QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

Earthquake near Louisville, TN

USGS: 6 km S of Louisville, Tennessee

25 km (15 mi) SSW of Knoxville, TN

11:42 pm EST, Feb 7, 2018 · · 23 km deep · released about 18 lb of TNT

Every earthquake near Louisville Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Blount County 14 kmLoudon County 25 kmKnox County 27 kmMonroe County 40 kmAnderson County 42 kmRoane County 44 kmSevier County 47 kmGraham County 50 kmSwain 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
11:42 pm EST on 7 February 2018 ()
Where
7 km (4 mi) S of Louisville, TN · earthquakes near Louisville
Magnitude
M 1.9 (md)
Depth
23 km below the surface
Felt
no reports yet
Nearest
Blount County, 14 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3159 days ago

A magnitude 1.9 earthquake was recorded 7 km (4 mi) S of Louisville, TN, at 11:42 pm EST on 7 February 2018 (04:42 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

Earthquakes near other towns within 30 km: Maryville, Alcoa, Eagleton Village, Wildwood, Greenback, Farragut.

How big was it?

This earthquake released about 18 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 5.8 840,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 600,000× the energy of this one
  3. Around the size people start to feel M 3.0 53× the energy of this one
  4. This earthquake M 1.9 about 18 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.

For this area

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 35.7635, -84.0427. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Blount County, TN 14 km (8 mi) SE earthquakes near Blount County
Loudon County, TN 25 km (15 mi) W earthquakes near Loudon County
Knox County, TN 27 km (17 mi) NNE earthquakes near Knox County
Monroe County, TN 40 km (25 mi) SSW earthquakes near Monroe County
Anderson County, TN 42 km (26 mi) NNW earthquakes near Anderson County
Roane County, TN 44 km (28 mi) WNW earthquakes near Roane County

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

Aftershocks so far

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

  1. 2.6 3 km ENE of Philadelphia, Tennessee
  2. 2.4 7 km SW of Mascot, Tennessee
  3. 2.6 7 km WNW of Farragut, Tennessee
  4. 1.9 4 km SSW of Maryville, Tennessee
  5. 2.1 11 km NW of Huntsville, Tennessee
  6. 1.8 1 km WNW of Eagleton Village, Tennessee
  7. 2.0 3 km SSW of Maryville, Tennessee
  8. 2.1 3 km SSW of Maryville, Tennessee
  9. 2.0 0 km W of Maryville, Tennessee
  10. 2.4 2 km SSW of Maryville, Tennessee
  11. 2.3 0 km WSW of Maryville, Tennessee
  12. 1.7 2 km NE of Tellico Village, Tennessee
  13. 2.1 2 km ESE of Tellico Village, Tennessee
  14. 2.2 2 km ESE of Tellico Village, Tennessee
  15. 2.3 1 km E of Tellico Village, 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.