QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3md

9 km SSE of Ridgely, Tennessee

· 11 km deep · released about 1.2 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Dyer County 16 kmLake County 17 kmPemiscot County 30 kmObion County 33 kmFulton County 47 kmNew Madrid County 49 kmLauderdale County 50 kmCrockett County 50 kmGibson County 51 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 3.3 (md)
Depth
11 km below the surface
Felt
262 reports · strongest reported intensity V
Nearest
Dyer County, 16 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 864 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 262 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 140,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 6,500× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,600× the energy of this one
  4. This earthquake M 3.3 about 1.2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.5× 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 36.1868, -89.4517. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Dyer County, TN 16 km (10 mi) NNW of here earthquakes near Dyer County
Lake County, TN 17 km (10 mi) S of here earthquakes near Lake County
Pemiscot County, MO 30 km (19 mi) E of here earthquakes near Pemiscot County
Obion County, TN 33 km (21 mi) SW of here earthquakes near Obion County
Fulton County, KY 47 km (29 mi) SSW of here earthquakes near Fulton County
New Madrid County, MO 49 km (30 mi) SSE of here earthquakes near New Madrid County

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

Aftershocks so far

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

  1. 1.5 4 km NW of Marston, Missouri
  2. 1.6 3 km ENE of Marston, Missouri
  3. 1.6 4 km E of Caruthersville, Missouri
  4. 1.6 3 km WNW of Marston, Missouri
  5. 1.5 3 km WNW of Marston, Missouri
  6. 1.7 4 km ENE of North Lilbourn, Missouri
  7. 2.3 0 km WSW of Howardville, Missouri
  8. 1.6 2 km NW of Ridgely, Tennessee
  9. 1.8 4 km NW of Ridgely, Tennessee
  10. 1.6 2 km NW of Ridgely, Tennessee
  11. 2.0 0 km NNW of Cooter, Missouri
  12. 1.6 2 km NW of Ridgely, Tennessee
  13. 1.9 0 km NNW of Howardville, Missouri
  14. 2.0 8 km SW of Tiptonville, Tennessee
  15. 2.2 2 km ENE of Lilbourn, Missouri

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

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