QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

8 km NE of Longtown, Missouri

· 2.5 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Perry County 9 kmJackson County 29 kmCape Girardeau County 37 kmRandolph County 39 kmSte. Genevieve County 45 kmUnion County 48 kmPerry County 50 kmBollinger County 52 kmMadison County 62 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 1.8 (md)
Depth
2.5 km below the surface
Felt
no reports yet
Nearest
Perry County, 9 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2172 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 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 37.7150, -89.7030. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Perry County, MO 9 km (5 mi) E of here earthquakes near Perry County
Jackson County, IL 29 km (18 mi) WSW of here earthquakes near Jackson County
Cape Girardeau County, MO 37 km (23 mi) N of here earthquakes near Cape Girardeau County
Randolph County, IL 39 km (24 mi) SSE of here earthquakes near Randolph County
Ste. Genevieve County, MO 45 km (28 mi) ESE of here earthquakes near Ste. Genevieve County
Union County, IL 48 km (30 mi) WNW of here earthquakes near Union County

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

Aftershocks so far

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

  1. 2.0 14 km SSE of Weingarten, Missouri
  2. 1.9 6 km WNW of Cape Girardeau, Missouri
  3. 2.2 15 km SW of Ozora, Missouri
  4. 1.6 11 km WNW of Jonesboro, Illinois
  5. 2.1 4 km N of Marquand, Missouri
  6. 2.4 8 km SW of Ozora, Missouri
  7. 2.0 3 km WSW of Cape Girardeau, Missouri
  8. 2.2 6 km E of Ellis Grove, Illinois
  9. 1.7 5 km NW of Cape Girardeau, 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.