QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

4 km S of Caldwell, Kansas

· 6.6 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grant County 28 kmSumner County 29 kmKay County 45 kmHarper County 47 kmGarfield County 70 kmAlfalfa County 71 kmCowley County 73 kmNoble County 74 kmSedgwick 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
6.6 km below the surface
Felt
no reports yet
Nearest
Grant County, 28 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3624 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 36.9880, -97.5988. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grant County, OK 28 km (17 mi) NE of here earthquakes near Grant County
Sumner County, KS 29 km (18 mi) SSW of here earthquakes near Sumner County
Kay County, OK 45 km (28 mi) WNW of here earthquakes near Kay County
Harper County, KS 47 km (29 mi) ESE of here earthquakes near Harper County
Garfield County, OK 70 km (43 mi) NNE of here earthquakes near Garfield County
Alfalfa County, OK 71 km (44 mi) ENE of here earthquakes near Alfalfa 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. 2.2 6 km SSE of Harper, Kansas
  2. 1.5 4 km ESE of Caldwell, Kansas
  3. 3.4 8 km W of Deer Creek, Oklahoma
  4. 3.2 8 km W of Deer Creek, Oklahoma
  5. 2.7 Oklahoma
  6. 1.8 5 km W of Argonia, Kansas
  7. 1.9 4 km WSW of Bluff City, Kansas
  8. 1.7 5 km SE of Manchester, Oklahoma
  9. 1.7 3 km ENE of Freeport, Kansas
  10. 2.7 8 km W of Deer Creek, Oklahoma
  11. 1.7 5 km ENE of Mayfield, Kansas
  12. 1.6 3 km ENE of Freeport, Kansas
  13. 1.7 5 km SSE of Harper, Kansas
  14. 1.6 6 km SSE of Harper, Kansas
  15. 3.1 4 km ESE 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.

On USGS

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