QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

2 km SW of Bluff City, Kansas

· 7.3 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Harper County 21 kmGrant County 31 kmSumner County 41 kmAlfalfa County 53 kmKingman County 60 kmKay County 72 kmBarber County 73 kmGarfield County 76 kmSedgwick County 79 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 2.1 (ml)
Depth
7.3 km below the surface
Felt
no reports yet
Nearest
Harper County, 21 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3874 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 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 37.0563, -97.8923. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Harper County, KS 21 km (13 mi) SE of here earthquakes near Harper County
Grant County, OK 31 km (19 mi) NNW of here earthquakes near Grant County
Sumner County, KS 41 km (25 mi) WSW of here earthquakes near Sumner County
Alfalfa County, OK 53 km (33 mi) NE of here earthquakes near Alfalfa County
Kingman County, KS 60 km (37 mi) SSE of here earthquakes near Kingman County
Kay County, OK 72 km (45 mi) WNW of here earthquakes near Kay County

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

Aftershocks so far

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

  1. 1.9 8 km ENE of Caldwell, Kansas
  2. 1.9 5 km SE of Freeport, Kansas
  3. 2.0 5 km SW of Mayfield, Kansas
  4. 2.0 10 km NW of South Haven, Kansas
  5. 1.5 4 km ESE of Manchester, Oklahoma
  6. 1.7 6 km SSE of Anthony, Kansas
  7. 2.6 8 km WNW of Medford, Oklahoma
  8. 2.5 12 km WNW of Caldwell, Kansas
  9. 2.5 5 km SW of Hunnewell, Kansas
  10. 3.0 5 km E of Pond Creek, Oklahoma
  11. 1.6 4 km SSW of Bluff City, Kansas
  12. 1.8 1 km SW of Mayfield, Kansas
  13. 1.6 13 km NNW of Caldwell, Kansas
  14. 2.7 10 km NW of Medford, Oklahoma
  15. 2.5 4 km SW of Bluff City, 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.