QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

7 km SSW of Olympian Village, Missouri

· 9.4 km deep · released about 44 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Jefferson County 22 kmSt. Francois County 28 kmSte. Genevieve County 34 kmMonroe County 35 kmWashington County 39 kmIron County 53 kmRandolph County 57 kmSt. Louis County 64 kmFranklin 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 2.1 (md)
Depth
9.4 km below the surface
Felt
no reports yet
Nearest
Jefferson County, 22 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2150 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 44 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 340,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 240,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 44 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 38.0663, -90.4758. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Jefferson County, MO 22 km (14 mi) SSE of here earthquakes near Jefferson County
St. Francois County, MO 28 km (18 mi) N of here earthquakes near St. Francois County
Ste. Genevieve County, MO 34 km (21 mi) NW of here earthquakes near Ste. Genevieve County
Monroe County, IL 35 km (22 mi) SW of here earthquakes near Monroe County
Washington County, MO 39 km (24 mi) ENE of here earthquakes near Washington County
Iron County, MO 53 km (33 mi) NNE of here earthquakes near Iron County

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

Aftershocks so far

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

  1. 2.0 14 km SSE of Weingarten, Missouri
  2. 2.0 6 km SSW of Valmeyer, Illinois
  3. 2.2 15 km SW of Ozora, Missouri
  4. 2.4 3 km ESE of Fenton, Missouri
  5. 1.7 3 km WNW of Olympian Village, Missouri
  6. 2.3 4 km S of Valmeyer, Illinois
  7. 2.4 8 km SW of Ozora, Missouri
  8. 2.3 4 km E of Herculaneum, Missouri
  9. 1.9 5 km NW of Weingarten, Missouri
  10. 2.5 eastern Missouri
  11. 2.2 4 km E of Bonne Terre, Missouri
  12. 2.2 5 km NNE of Terre du Lac, Missouri
  13. 1.9 5 km W of Terre du Lac, Missouri
  14. 2.5 2 km ESE of Eureka, 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.