QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

5 km W of Medford, Oklahoma

· 6.3 km deep · released about 480 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grant County 3 kmAlfalfa County 47 kmHarper County 48 kmGarfield County 48 kmSumner County 55 kmKay County 58 kmNoble County 69 kmMajor County 86 kmKingman County 88 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 2.8 (ml)
Depth
6.3 km below the surface
Felt
no reports yet
Nearest
Grant County, 3 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3761 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 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 2× the energy of this one
  4. This earthquake M 2.8 about 480 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 36.8118, -97.8002. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grant County, OK 3 km (2 mi) NNW of here earthquakes near Grant County
Alfalfa County, OK 47 km (30 mi) E of here earthquakes near Alfalfa County
Harper County, KS 48 km (30 mi) SSE of here earthquakes near Harper County
Garfield County, OK 48 km (30 mi) N of here earthquakes near Garfield County
Sumner County, KS 55 km (34 mi) SSW of here earthquakes near Sumner County
Kay County, OK 58 km (36 mi) W of here earthquakes near Kay County

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

Aftershocks so far

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

  1. 1.6 5 km ESE of Caldwell, Kansas
  2. 2.7 4 km S of Braman, Oklahoma
  3. 2.6 1 km WSW of Braman, Oklahoma
  4. 3.0 8 km ESE of Pond Creek, Oklahoma
  5. 2.1 4 km ENE of Caldwell, Kansas
  6. 2.8 8 km ESE of Pond Creek, Oklahoma
  7. 1.9 6 km SW of Manchester, Oklahoma
  8. 1.8 6 km SW of Manchester, Oklahoma
  9. 1.6 6 km NNE of Bluff City, Kansas
  10. 2.8 4 km SSW of Renfrow, Oklahoma
  11. 2.8 9 km W of Lamont, Oklahoma
  12. 2.9 6 km SW of Manchester, Oklahoma
  13. 2.1 6 km NNE of Bluff City, Kansas
  14. 2.6 7 km NNW of Hunter, Oklahoma
  15. 1.7 12 km NNW of Caldwell, 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.

On USGS

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