QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5ml

19 km WSW of Hardtner, Kansas

· 6.7 km deep · released about 170 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Woods County 26 kmBarber County 33 kmComanche County 43 kmAlfalfa County 53 kmWoodward County 70 kmHarper County 74 kmHarper County 74 kmMajor County 77 kmKiowa 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 2.5 (ml)
Depth
6.7 km below the surface
Felt
no reports yet
Nearest
Woods County, 26 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3340 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 36.9581, -98.8526. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Woods County, OK 26 km (16 mi) N of here earthquakes near Woods County
Barber County, KS 33 km (20 mi) SSW of here earthquakes near Barber County
Comanche County, KS 43 km (27 mi) SE of here earthquakes near Comanche County
Alfalfa County, OK 53 km (33 mi) WNW of here earthquakes near Alfalfa County
Woodward County, OK 70 km (44 mi) NNE of here earthquakes near Woodward County
Harper County, OK 74 km (46 mi) ENE of here earthquakes near Harper County

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

Aftershocks so far

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

  1. 2.6 3 km WNW of Byron, Oklahoma
  2. 2.6 3 km WNW of Byron, Oklahoma
  3. 2.9 4 km W of Amorita, Oklahoma
  4. 2.7 3 km WNW of Byron, Oklahoma
  5. 3.1 3 km WNW of Byron, Oklahoma
  6. 3.4 3 km W of Byron, Oklahoma
  7. 3.7 Oklahoma
  8. 2.9 3 km W of Byron, Oklahoma
  9. 2.3 1 km SW of Cherokee, Oklahoma
  10. 2.5 26 km ENE of Buffalo, Oklahoma
  11. 2.5 5 km NW of Dacoma, Oklahoma
  12. 2.5 27 km ENE of Buffalo, Oklahoma
  13. 2.9 1 km NNW of Lambert, Oklahoma
  14. 2.8 9 km SW of Waynoka, Oklahoma
  15. 3.0 1 km SSW of Cherokee, 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.