QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4md

3 km ESE of Fenton, Missouri

· 17 km deep · released about 110 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N St. Louis County 17 kmSt. Louis city 21 kmJefferson County 29 kmMonroe County 31 kmSt. Charles County 40 kmSt. Clair County 41 kmMadison County 57 kmFranklin County 59 kmJersey County 65 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 2.4 (md)
Depth
17 km below the surface
Felt
136 reports · strongest reported intensity III
Nearest
St. Louis County, 17 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 9 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 136 people have reported feeling it to USGS.

How big was it?

This earthquake released about 110 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 95,000× the energy of this one
  3. Around the size people start to feel M 3.0 8.5× the energy of this one
  4. This earthquake M 2.4 about 110 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 38.4947, -90.3997. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
St. Louis County, MO 17 km (10 mi) SSE of here earthquakes near St. Louis County
St. Louis city, MO 21 km (13 mi) SW of here earthquakes near St. Louis city
Jefferson County, MO 29 km (18 mi) NNE of here earthquakes near Jefferson County
Monroe County, IL 31 km (19 mi) NW of here earthquakes near Monroe County
St. Charles County, MO 40 km (25 mi) SE of here earthquakes near St. Charles County
St. Clair County, IL 41 km (26 mi) W of here earthquakes near St. Clair County

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

Aftershocks so far

1 earthquake has been recorded within 50 km since this one.

  1. 2.0 6 km SSW of Valmeyer, 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.