QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

7 km N of Argonia, Kansas

· 4.8 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sumner County 27 kmHarper County 30 kmKingman County 41 kmSedgwick County 48 kmGrant County 61 kmReno County 73 kmKay County 80 kmBarber County 81 kmAlfalfa County 83 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
4.8 km below the surface
Felt
no reports yet
Nearest
Sumner County, 27 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3285 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 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× the energy of this one
  4. This earthquake M 1.8 about 15 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 37.3323, -97.7762. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sumner County, KS 27 km (17 mi) WNW of here earthquakes near Sumner County
Harper County, KS 30 km (19 mi) ENE of here earthquakes near Harper County
Kingman County, KS 41 km (25 mi) SE of here earthquakes near Kingman County
Sedgwick County, KS 48 km (30 mi) SW of here earthquakes near Sedgwick County
Grant County, OK 61 km (38 mi) N of here earthquakes near Grant County
Reno County, KS 73 km (46 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

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

  1. 1.6 10 km NNW of Caldwell, Kansas
  2. 1.9 3 km E of Freeport, Kansas
  3. 1.6 7 km E of Manchester, Oklahoma
  4. 1.7 4 km SW of Mayfield, Kansas
  5. 1.6 2 km E of Freeport, Kansas
  6. 1.8 6 km SSW of Freeport, Kansas
  7. 1.7 1 km NNW of Milan, Kansas
  8. 1.5 6 km ESE of Freeport, Kansas
  9. 2.3 6 km NW of Renfrow, Oklahoma
  10. 1.9 3 km E of Freeport, Kansas
  11. 2.2 10 km N of Caldwell, Kansas
  12. 1.7 11 km N of Caldwell, Kansas
  13. 1.7 4 km NW of Bluff City, Kansas
  14. 1.6 4 km ENE of Milan, Kansas
  15. 2.6 4 km ENE of Milan, 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.