QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5mlg

5 km SE of New Grand Chain, Illinois

· 16 km deep · released about 2.7 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Pulaski County 12 kmBallard County 18 kmMassac County 25 kmJohnson County 29 kmMcCracken County 30 kmAlexander County 32 kmUnion County 38 kmCarlisle County 40 kmPope County 45 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 3.5 (mlg)
Depth
16 km below the surface
Felt
215 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Nearest
Pulaski County, 12 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1035 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 215 people have reported feeling it to USGS.

How big was it?

This earthquake released about 2.7 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 63,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,000× the energy of this one
  4. This earthquake M 3.5 about 2.7 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 5.6× 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 37.2137, -88.9877. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Pulaski County, IL 12 km (8 mi) E of here earthquakes near Pulaski County
Ballard County, KY 18 km (11 mi) N of here earthquakes near Ballard County
Massac County, IL 25 km (16 mi) W of here earthquakes near Massac County
Johnson County, IL 29 km (18 mi) SSW of here earthquakes near Johnson County
McCracken County, KY 30 km (19 mi) NW of here earthquakes near McCracken County
Alexander County, IL 32 km (20 mi) E of here earthquakes near Alexander County

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

Aftershocks so far

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

  1. 2.0 3 km NE of Ullin, Illinois
  2. 2.4 2 km NNE of Wilson City, Missouri
  3. 1.6 3 km WNW of Mill Creek, Illinois
  4. 1.9 5 km ENE of Kevil, Kentucky
  5. 2.1 1 km WSW of Mill Creek, Illinois
  6. 2.2 4 km ENE of Olmsted, Illinois
  7. 1.6 Illinois-Kentucky border region
  8. 1.8 5 km NNE of Bandana, Kentucky
  9. 2.6 3 km ENE of Wilson City, Missouri
  10. 1.9 4 km WNW of Barlow, Kentucky
  11. 2.0 2 km NNE of Wilson City, Missouri
  12. 2.4 2 km ENE of Wilson City, Missouri
  13. 2.0 southeastern Missouri
  14. 2.0 3 km SSW of McClure, Illinois
  15. 2.0 7 km WSW of Metropolis, Illinois

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.