QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1mb_lg

9 km SW of Milton, Kansas

· 5.0 km deep · released about 1,300 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Harper County 28 kmKingman County 33 kmSumner County 35 kmSedgwick County 48 kmGrant County 65 kmReno County 67 kmBarber County 76 kmAlfalfa County 83 kmHarvey County 84 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 3.1 (mb_lg)
Depth
5.0 km below the surface
Felt
2 reports · strongest reported intensity IV
Nearest
Harper County, 28 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1511 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× more

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 37.3722, -97.8452. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Harper County, KS 28 km (18 mi) NE of here earthquakes near Harper County
Kingman County, KS 33 km (21 mi) SE of here earthquakes near Kingman County
Sumner County, KS 35 km (21 mi) WNW of here earthquakes near Sumner County
Sedgwick County, KS 48 km (30 mi) SW of here earthquakes near Sedgwick County
Grant County, OK 65 km (40 mi) N of here earthquakes near Grant County
Reno County, KS 67 km (42 mi) SSE of here earthquakes near Reno County

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

Aftershocks so far

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

  1. 3.0 11 km SE of Mayfield, Kansas
  2. 2.2 11 km SE of Mayfield, Kansas
  3. 2.1 11 km SE of Mayfield, Kansas
  4. 2.6 11 km SW of Wellington, Kansas
  5. 1.6 11 km SE of Mayfield, Kansas
  6. 1.7 11 km SE of Mayfield, Kansas
  7. 2.8 11 km SE of Mayfield, Kansas
  8. 2.8 11 km SE of Mayfield, Kansas
  9. 2.2 11 km SE of Mayfield, Kansas
  10. 1.7 11 km SE of Mayfield, Kansas
  11. 2.3 11 km SE of Mayfield, Kansas
  12. 2.1 5 km W of Danville, Kansas
  13. 2.0 5 km W of Danville, Kansas
  14. 2.3 6 km NNE of Danville, Kansas
  15. 1.6 6 km NNW of Argonia, 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.