QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

6 km ENE of Harper, Kansas

· 6.0 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Harper County 17 kmKingman County 31 kmSumner County 42 kmGrant County 60 kmSedgwick County 60 kmBarber County 65 kmReno County 71 kmAlfalfa County 72 kmPratt County 78 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
6.0 km below the surface
Felt
no reports yet
Nearest
Harper County, 17 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2691 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 37.3120, -97.9608. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Harper County, KS 17 km (10 mi) NE of here earthquakes near Harper County
Kingman County, KS 31 km (19 mi) SSE of here earthquakes near Kingman County
Sumner County, KS 42 km (26 mi) WNW of here earthquakes near Sumner County
Grant County, OK 60 km (37 mi) NNW of here earthquakes near Grant County
Sedgwick County, KS 60 km (37 mi) SW of here earthquakes near Sedgwick County
Barber County, KS 65 km (40 mi) E of here earthquakes near Barber County

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

Aftershocks so far

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

  1. 1.7 4 km E of Wakita, Oklahoma
  2. 2.2 8 km NNE of Harper, Kansas
  3. 2.6 6 km NNE of Norwich, Kansas
  4. 2.5 Kansas
  5. 2.9 6 km NE of Norwich, Kansas
  6. 2.4 11 km NE of Caldwell, Kansas
  7. 1.5 7 km S of Manchester, Oklahoma
  8. 3.7 7 km S of Manchester, Oklahoma
  9. 2.4 1 km SSW of Manchester, Oklahoma
  10. 3.0 8 km N of Caldwell, Kansas
  11. 1.6 3 km SE of Manchester, Oklahoma
  12. 2.8 8 km W of Bluff City, Kansas
  13. 2.2 10 km SW of Norwich, Kansas
  14. 2.0 7 km WNW of Wakita, Oklahoma
  15. 2.1 11 km NE of Wakita, Oklahoma

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.