QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2md

Earthquake near Coalfield, TN

USGS: 3 km SSE of Coalfield, Tennessee

41 km (25 mi) W of Knoxville, TN

4:34 am EST, Feb 15, 2018 · · 13 km deep · released about 56 lb of TNT

Every earthquake near Coalfield Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Roane County 20 kmAnderson County 22 kmMorgan County 27 kmLoudon County 30 kmKnox County 41 kmScott County 49 kmCampbell County 50 kmCumberland County 54 kmBlount County 55 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
4:34 am EST on 15 February 2018 ()
Where
4 km (2 mi) SSE of Coalfield, TN · earthquakes near Coalfield
Magnitude
M 2.2 (md)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Roane County, 20 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3151 days ago

A magnitude 2.2 earthquake was recorded 4 km (2 mi) SSE of Coalfield, TN, at 4:34 am EST on 15 February 2018 (09:34 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

Earthquakes near other towns within 30 km: Oliver Springs, Oak Ridge, Harriman, Kingston, Midtown, Farragut.

How big was it?

This earthquake released about 56 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 270,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 190,000× the energy of this one
  3. Around the size people start to feel M 3.0 17× the energy of this one
  4. This earthquake M 2.2 about 56 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 36.0003, -84.3983. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Roane County, TN 20 km (13 mi) SSW earthquakes near Roane County
Anderson County, TN 22 km (14 mi) NE earthquakes near Anderson County
Morgan County, TN 27 km (17 mi) NW earthquakes near Morgan County
Loudon County, TN 30 km (19 mi) SSE earthquakes near Loudon County
Knox County, TN 41 km (26 mi) E earthquakes near Knox County
Scott County, TN 49 km (30 mi) N earthquakes near Scott County

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

Aftershocks so far

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

  1. 2.0 2 km WNW of Greenback, Tennessee
  2. 2.2 5 km S of Sweetwater, Tennessee
  3. 2.0 7 km SSE of Rockwood, Tennessee
  4. 2.3 1 km ENE of Maryville, Tennessee
  5. 2.6 3 km ENE of Philadelphia, Tennessee
  6. 2.5 3 km WSW of Petros, Tennessee
  7. 2.6 7 km WNW of Farragut, Tennessee
  8. 1.9 4 km SSW of Maryville, Tennessee
  9. 2.1 11 km NW of Huntsville, Tennessee
  10. 1.8 1 km WNW of Eagleton Village, Tennessee
  11. 2.0 3 km SSW of Maryville, Tennessee
  12. 2.1 3 km SSW of Maryville, Tennessee
  13. 2.0 0 km W of Maryville, Tennessee
  14. 2.4 2 km SSW of Maryville, Tennessee
  15. 2.3 0 km WSW of Maryville, 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.