QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

10 km SSE of Waldron, Kansas

· 10 km deep · released about 1,300 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alfalfa County 27 kmHarper County 30 kmGrant County 34 kmBarber County 60 kmSumner County 67 kmGarfield County 67 kmWoods County 69 kmKingman County 71 kmMajor 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 3.1 (ml)
Depth
10 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Alfalfa County, 27 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3394 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× more

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 36.9185, -98.1290. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alfalfa County, OK 27 km (17 mi) NE of here earthquakes near Alfalfa County
Harper County, KS 30 km (19 mi) S of here earthquakes near Harper County
Grant County, OK 34 km (21 mi) WNW of here earthquakes near Grant County
Barber County, KS 60 km (37 mi) SE of here earthquakes near Barber County
Sumner County, KS 67 km (41 mi) WSW of here earthquakes near Sumner County
Garfield County, OK 67 km (42 mi) NNW of here earthquakes near Garfield County

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

Aftershocks so far

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

  1. 2.0 10 km WNW of Caldwell, Kansas
  2. 1.8 2 km E of Anthony, Kansas
  3. 3.3 8 km ENE of Cherokee, Oklahoma
  4. 2.6 5 km WNW of Medford, Oklahoma
  5. 1.7 2 km E of Anthony, Kansas
  6. 3.6 9 km W of Lamont, Oklahoma
  7. 3.0 Oklahoma
  8. 2.5 9 km W of Lamont, Oklahoma
  9. 2.3 3 km NNW of Freeport, Kansas
  10. 1.6 4 km ESE of Harper, Kansas
  11. 2.5 5 km WNW of Medford, Oklahoma
  12. 3.1 9 km W of Lamont, Oklahoma
  13. 1.6 11 km NNW of Caldwell, Kansas
  14. 2.7 9 km W of Bluff City, Kansas
  15. 2.5 9 km W 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.0 on 2016-11-25 — it released about 22 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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