QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

1 km WSW of Mill Creek, Illinois

· 13 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Union County 17 kmPulaski County 18 kmAlexander County 18 kmJohnson County 37 kmCape Girardeau County 37 kmBallard County 39 kmScott County 42 kmJackson County 51 kmMassac County 51 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
13 km below the surface
Felt
no reports yet
Nearest
Union County, 17 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 888 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 43 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 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× 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 43 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 37.3357, -89.2670. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Union County, IL 17 km (10 mi) S of here earthquakes near Union County
Pulaski County, IL 18 km (11 mi) NW of here earthquakes near Pulaski County
Alexander County, IL 18 km (11 mi) NNE of here earthquakes near Alexander County
Johnson County, IL 37 km (23 mi) WSW of here earthquakes near Johnson County
Cape Girardeau County, MO 37 km (23 mi) E of here earthquakes near Cape Girardeau County
Ballard County, KY 39 km (24 mi) NW of here earthquakes near Ballard County

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

Aftershocks so far

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

  1. 1.9 6 km WNW of Cape Girardeau, Missouri
  2. 1.6 11 km WNW of Jonesboro, Illinois
  3. 2.0 3 km NE of Ullin, Illinois
  4. 2.4 2 km NNE of Wilson City, Missouri
  5. 1.6 3 km WNW of Mill Creek, Illinois
  6. 1.9 5 km ENE of Kevil, Kentucky

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.