QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

2 km SE of Milan, Kansas

· 3.9 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sumner County 15 kmHarper County 37 kmGrant County 52 kmSedgwick County 52 kmKingman County 55 kmKay County 66 kmCowley County 73 kmAlfalfa County 82 kmReno County 87 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 (ml)
Depth
3.9 km below the surface
Felt
no reports yet
Nearest
Sumner County, 15 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3695 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 16 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 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 37.2420, -97.6587. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sumner County, KS 15 km (9 mi) W of here earthquakes near Sumner County
Harper County, KS 37 km (23 mi) E of here earthquakes near Harper County
Grant County, OK 52 km (32 mi) NNE of here earthquakes near Grant County
Sedgwick County, KS 52 km (32 mi) SSW of here earthquakes near Sedgwick County
Kingman County, KS 55 km (34 mi) SE of here earthquakes near Kingman County
Kay County, OK 66 km (41 mi) NW of here earthquakes near Kay County

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

Aftershocks so far

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

  1. 1.8 10 km ESE of Bluff City, Kansas
  2. 1.9 9 km NNW of Caldwell, Kansas
  3. 2.7 5 km NE of Medford, Oklahoma
  4. 2.0 6 km ENE of Caldwell, Kansas
  5. 3.3 7 km NNE of Wakita, Oklahoma
  6. 1.6 6 km ENE of Caldwell, Kansas
  7. 2.7 6 km NNE of Wakita, Oklahoma
  8. 2.7 6 km ENE of Caldwell, Kansas
  9. 2.8 6 km NNE of Wakita, Oklahoma
  10. 3.5 6 km NNE of Wakita, Oklahoma
  11. 3.7 4 km NNW of Wakita, Oklahoma
  12. 3.9 6 km N of Wakita, Oklahoma
  13. 2.4 7 km E of Bluff City, Kansas
  14. 1.5 7 km E of Bluff City, Kansas
  15. 1.8 7 km E of Bluff City, Kansas

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.