QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

3 km ENE of Freeport, Kansas

· 6.4 km deep · released about 49 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Harper County 22 kmSumner County 29 kmGrant County 47 kmKingman County 48 kmSedgwick County 61 kmAlfalfa County 70 kmKay County 74 kmBarber County 77 kmReno County 85 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
6.4 km below the surface
Felt
no reports yet
Nearest
Harper County, 22 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3695 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 49 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 5.8 310,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 220,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 49 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 37.2113, -97.8157. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Harper County, KS 22 km (14 mi) E of here earthquakes near Harper County
Sumner County, KS 29 km (18 mi) W of here earthquakes near Sumner County
Grant County, OK 47 km (29 mi) N of here earthquakes near Grant County
Kingman County, KS 48 km (30 mi) SE of here earthquakes near Kingman County
Sedgwick County, KS 61 km (38 mi) SSW of here earthquakes near Sedgwick County
Alfalfa County, OK 70 km (44 mi) NE of here earthquakes near Alfalfa County

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

Aftershocks so far

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

  1. 3.9 6 km N of Wakita, Oklahoma
  2. 2.4 7 km E of Bluff City, Kansas
  3. 1.5 7 km E of Bluff City, Kansas
  4. 1.8 7 km E of Bluff City, Kansas
  5. 1.6 6 km ESE of Freeport, Kansas
  6. 1.9 7 km ESE of Anthony, Kansas
  7. 1.5 5 km SW of Harper, Kansas
  8. 1.6 5 km SW of Harper, Kansas
  9. 2.2 Kansas
  10. 2.7 9 km W of Deer Creek, Oklahoma
  11. 2.3 5 km S of Argonia, Kansas
  12. 3.4 6 km NNE of Medford, Oklahoma
  13. 1.5 5 km S of Argonia, Kansas
  14. 1.5 5 km S of Argonia, Kansas
  15. 2.7 6 km N 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.