QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

5 km SW of Hamel, Illinois

· 16 km deep · released about 88 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madison County 3 kmBond County 39 kmSt. Louis city 39 kmSt. Clair County 42 kmMacoupin County 47 kmClinton County 48 kmJersey County 49 kmSt. Louis County 54 kmMontgomery 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
Magnitude
M 2.3 (md)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Madison County, 3 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1646 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 88 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 170,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 120,000× the energy of this one
  3. Around the size people start to feel M 3.0 11× the energy of this one
  4. This earthquake M 2.3 about 88 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 38.8477, -89.8827. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madison County, IL 3 km (2 mi) NNE of here earthquakes near Madison County
Bond County, IL 39 km (24 mi) W of here earthquakes near Bond County
St. Louis city, MO 39 km (24 mi) NE of here earthquakes near St. Louis city
St. Clair County, IL 42 km (26 mi) N of here earthquakes near St. Clair County
Macoupin County, IL 47 km (29 mi) S of here earthquakes near Macoupin County
Clinton County, IL 48 km (30 mi) NW of here earthquakes near Clinton County

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

Aftershocks so far

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

  1. 2.4 8 km WNW of Keyesport, Illinois
  2. 2.4 1 km SSW of O'Fallon, Illinois
  3. 2.8 1 km NNE of Germantown, 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.