QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5ml

2 km SW of Waldron, Kansas

· 4.5 km deep · released about 170 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Harper County 25 kmAlfalfa County 31 kmGrant County 43 kmBarber County 50 kmKingman County 63 kmWoods County 66 kmSumner County 69 kmGarfield County 77 kmMajor County 81 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 2.5 (ml)
Depth
4.5 km below the surface
Felt
no reports yet
Nearest
Harper County, 25 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3366 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 170 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 89,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 63,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.6× the energy of this one
  4. This earthquake M 2.5 about 170 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 36.9878, -98.2019. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Harper County, KS 25 km (16 mi) SSW of here earthquakes near Harper County
Alfalfa County, OK 31 km (19 mi) NNE of here earthquakes near Alfalfa County
Grant County, OK 43 km (27 mi) WNW of here earthquakes near Grant County
Barber County, KS 50 km (31 mi) ESE of here earthquakes near Barber County
Kingman County, KS 63 km (39 mi) S of here earthquakes near Kingman County
Woods County, OK 66 km (41 mi) ENE of here earthquakes near Woods 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. 1.9 7 km SE of Harper, Kansas
  2. 1.7 7 km SE of Harper, Kansas
  3. 2.0 6 km SE of Harper, Kansas
  4. 1.7 3 km NNW of Freeport, Kansas
  5. 2.2 6 km SE of Harper, Kansas
  6. 2.3 9 km W of Bluff City, Kansas
  7. 2.6 10 km NE of Nash, Oklahoma
  8. 1.9 9 km W of Bluff City, Kansas
  9. 1.6 7 km SE of Harper, Kansas
  10. 1.9 6 km SE of Harper, Kansas
  11. 3.4 6 km SSE of Harper, Kansas
  12. 2.8 7 km SE of Harper, Kansas
  13. 2.7 1 km NNW of Lambert, Oklahoma
  14. 2.6 6 km WNW of Harper, Kansas
  15. 3.7 1 km NNW of Lambert, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.0 on 2016-11-25 — it released about 180 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.