QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

4 km NNE of Calhoun, Tennessee

· 17 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N McMinn County 14 kmMeigs County 21 kmBradley County 23 kmPolk County 31 kmRhea County 35 kmMonroe County 46 kmHamilton County 46 kmBledsoe County 51 kmLoudon County 59 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 1.8 (md)
Depth
17 km below the surface
Felt
no reports yet
Nearest
McMinn County, 14 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3163 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 35.3357, -84.7357. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
McMinn County, TN 14 km (9 mi) SW of here earthquakes near McMinn County
Meigs County, TN 21 km (13 mi) SSE of here earthquakes near Meigs County
Bradley County, TN 23 km (14 mi) NNE of here earthquakes near Bradley County
Polk County, TN 31 km (19 mi) NW of here earthquakes near Polk County
Rhea County, TN 35 km (22 mi) SSE of here earthquakes near Rhea County
Monroe County, TN 46 km (28 mi) WSW of here earthquakes near Monroe County

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

Aftershocks so far

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

  1. 1.7 4 km WNW of Madisonville, Tennessee
  2. 1.7 11 km ESE of Madisonville, Tennessee
  3. 2.3 10 km S of Etowah, Tennessee
  4. 2.4 2 km WSW of Sweetwater, Tennessee
  5. 2.3 1 km E of South Cleveland, Tennessee
  6. 1.8 3 km ENE of Madisonville, Tennessee
  7. 2.2 5 km S of Sweetwater, Tennessee
  8. 2.2 6 km W of Cohutta, Georgia
  9. 2.4 7 km E of Tellico Plains, Tennessee
  10. 2.1 12 km NNE of Decatur, Tennessee
  11. 2.1 3 km NNE of Athens, Tennessee
  12. 2.3 10 km SE of Dayton, Tennessee
  13. 2.0 11 km SE of Dayton, Tennessee
  14. 2.2 10 km SE of Dayton, Tennessee
  15. 1.7 1 km N 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.

On USGS

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