QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

3 km ENE of Medford, Oklahoma

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

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grant County 9 kmSumner County 50 kmKay County 50 kmGarfield County 50 kmHarper County 52 kmAlfalfa County 56 kmNoble County 64 kmCowley County 89 kmKingman County 90 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
5.4 km below the surface
Felt
no reports yet
Nearest
Grant County, 9 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3721 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 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 36.8231, -97.7014. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grant County, OK 9 km (5 mi) ENE of here earthquakes near Grant County
Sumner County, KS 50 km (31 mi) SSW of here earthquakes near Sumner County
Kay County, OK 50 km (31 mi) W of here earthquakes near Kay County
Garfield County, OK 50 km (31 mi) N of here earthquakes near Garfield County
Harper County, KS 52 km (32 mi) SE of here earthquakes near Harper County
Alfalfa County, OK 56 km (35 mi) E of here earthquakes near Alfalfa County

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

Aftershocks so far

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

  1. 3.2 5 km SW of Braman, Oklahoma
  2. 2.8 6 km SW of Braman, Oklahoma
  3. 2.8 6 km SW of Braman, Oklahoma
  4. 1.7 4 km S of Caldwell, Kansas
  5. 1.9 5 km SE of Freeport, Kansas
  6. 2.6 3 km W of Pond Creek, Oklahoma
  7. 2.6 8 km SE of Byron, Oklahoma
  8. 1.8 7 km E of Manchester, Oklahoma
  9. 1.9 4 km NNE of Anthony, Kansas
  10. 1.5 12 km NW of Renfrow, Oklahoma
  11. 1.7 6 km E of Manchester, Oklahoma
  12. 1.6 6 km SSE of Mayfield, Kansas
  13. 1.8 3 km ENE of Freeport, Kansas
  14. 2.6 2 km NW of Fairmont, Oklahoma
  15. 1.6 7 km E of Manchester, 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.