QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1mb_lg

7 km NNE of Attica, Kansas

· 5.0 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Harper County 18 kmKingman County 28 kmBarber County 44 kmPratt County 61 kmSumner County 63 kmAlfalfa County 65 kmGrant County 69 kmReno County 72 kmSedgwick County 77 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 (mb_lg)
Depth
5.0 km below the surface
Felt
no reports yet
Nearest
Harper County, 18 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3413 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 37.3091, -98.2004. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Harper County, KS 18 km (11 mi) NW of here earthquakes near Harper County
Kingman County, KS 28 km (17 mi) S of here earthquakes near Kingman County
Barber County, KS 44 km (27 mi) ENE of here earthquakes near Barber County
Pratt County, KS 61 km (38 mi) SE of here earthquakes near Pratt County
Sumner County, KS 63 km (39 mi) W of here earthquakes near Sumner County
Alfalfa County, OK 65 km (41 mi) N of here earthquakes near Alfalfa County

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

Aftershocks so far

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

  1. 2.5 9 km W of Bluff City, Kansas
  2. 1.6 5 km SSE of Freeport, Kansas
  3. 2.5 2 km SW of Waldron, Kansas
  4. 2.9 3 km NNW of Freeport, Kansas
  5. 1.8 3 km NNW of Freeport, Kansas
  6. 2.0 3 km NNW of Freeport, Kansas
  7. 3.0 10 km SSE of Waldron, Kansas
  8. 2.8 10 km SSE of Waldron, Kansas
  9. 2.5 10 km SSE of Waldron, Kansas
  10. 1.9 2 km WSW of Anthony, Kansas
  11. 2.4 2 km SW of Anthony, Kansas
  12. 1.7 9 km W of Bluff City, Kansas
  13. 2.0 9 km W of Bluff City, Kansas
  14. 2.5 10 km SSE of Waldron, Kansas
  15. 2.2 8 km NNW 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.