QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1mb_lg

8 km NE of Harper, 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 20 kmKingman County 27 kmSumner County 44 kmSedgwick County 58 kmGrant County 65 kmBarber County 65 kmReno County 67 kmPratt County 75 kmAlfalfa County 76 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
4 reports · strongest reported intensity II
Nearest
Harper County, 20 km SSW
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. 4 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 37.3495, -97.9730. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Harper County, KS 20 km (12 mi) NNE of here earthquakes near Harper County
Kingman County, KS 27 km (17 mi) SE of here earthquakes near Kingman County
Sumner County, KS 44 km (27 mi) WNW of here earthquakes near Sumner County
Sedgwick County, KS 58 km (36 mi) SW of here earthquakes near Sedgwick County
Grant County, OK 65 km (40 mi) NNW of here earthquakes near Grant County
Barber County, KS 65 km (40 mi) ENE of here earthquakes near Barber County

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

Aftershocks so far

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

  1. 3.2 9 km NNE of Danville, Kansas
  2. 1.7 7 km NNE of Danville, Kansas
  3. 3.1 9 km SW of Milton, Kansas
  4. 1.9 7 km NNE of Danville, Kansas
  5. 3.0 8 km NNE of Danville, Kansas
  6. 2.7 4 km NE of Danville, Kansas
  7. 1.6 7 km NNE of Danville, Kansas
  8. 2.8 5 km SSW of Norwich, Kansas
  9. 2.7 8 km NNE of Harper, Kansas
  10. 2.0 6 km SE of Harper, Kansas
  11. 2.4 6 km SSW of Norwich, Kansas
  12. 3.4 9 km NNE of Harper, Kansas
  13. 1.7 7 km NNE of Danville, Kansas
  14. 2.4 3 km NW of Freeport, Kansas
  15. 1.9 3 km NW of Freeport, 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.