QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

12 km SSW of Milan, Kansas

· 2.8 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sumner County 22 kmHarper County 30 kmGrant County 41 kmKingman County 58 kmSedgwick County 63 kmKay County 64 kmAlfalfa County 71 kmCowley County 79 kmBarber County 85 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
2.8 km below the surface
Felt
no reports yet
Nearest
Sumner County, 22 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3482 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 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× 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 37.1565, -97.7255. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sumner County, KS 22 km (14 mi) WSW of here earthquakes near Sumner County
Harper County, KS 30 km (19 mi) E of here earthquakes near Harper County
Grant County, OK 41 km (26 mi) N of here earthquakes near Grant County
Kingman County, KS 58 km (36 mi) SE of here earthquakes near Kingman County
Sedgwick County, KS 63 km (39 mi) SSW of here earthquakes near Sedgwick County
Kay County, OK 64 km (40 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

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

  1. 1.5 6 km NW of Mayfield, Kansas
  2. 1.7 2 km E of Anthony, Kansas
  3. 2.3 3 km NNW of Freeport, Kansas
  4. 1.6 4 km ESE of Harper, Kansas
  5. 1.8 7 km ESE of Mayfield, Kansas
  6. 1.6 6 km ESE of Mayfield, Kansas
  7. 2.5 5 km WNW of Medford, Oklahoma
  8. 2.4 7 km ESE of Mayfield, Kansas
  9. 2.1 7 km ESE of Mayfield, Kansas
  10. 1.6 11 km NNW of Caldwell, Kansas
  11. 2.7 8 km W of Belle Plaine, Kansas
  12. 2.7 9 km W of Bluff City, Kansas
  13. 2.5 9 km W of Bluff City, Kansas
  14. 1.6 5 km SSE of Freeport, Kansas
  15. 1.5 2 km NE of Caldwell, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.0 on 2016-11-25 — it released about 2,100 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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