QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

eastern Missouri

· 5.1 km deep · released about 150 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Monroe County 16 kmJefferson County 23 kmSt. Louis city 31 kmSt. Louis County 32 kmSt. Clair County 36 kmSt. Charles County 55 kmSte. Genevieve County 55 kmRandolph County 56 kmMadison County 63 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 2.5 (md)
Depth
5.1 km below the surface
Felt
298 reports · strongest reported intensity IV
Nearest
Monroe County, 16 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1323 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 298 people have reported feeling it to USGS.

How big was it?

This earthquake released about 150 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 99,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 70,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.2× the energy of this one
  4. This earthquake M 2.5 about 150 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 38.3670, -90.3227. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Monroe County, IL 16 km (10 mi) NW of here earthquakes near Monroe County
Jefferson County, MO 23 km (14 mi) ENE of here earthquakes near Jefferson County
St. Louis city, MO 31 km (19 mi) SSW of here earthquakes near St. Louis city
St. Louis County, MO 32 km (20 mi) SSE of here earthquakes near St. Louis County
St. Clair County, IL 36 km (22 mi) WSW of here earthquakes near St. Clair County
St. Charles County, MO 55 km (34 mi) SSE of here earthquakes near St. Charles County

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

Aftershocks so far

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

  1. 2.0 6 km SSW of Valmeyer, Illinois
  2. 2.4 3 km ESE of Fenton, Missouri
  3. 1.7 3 km WNW of Olympian Village, Missouri
  4. 2.3 4 km S of Valmeyer, Illinois
  5. 2.3 4 km E of Herculaneum, Missouri
  6. 2.4 1 km SSW of O'Fallon, Illinois
  7. 1.9 5 km NW of Weingarten, 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

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