QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5ml

9 km NW of Medford, Oklahoma

· 4.3 km deep · released about 170 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grant County 10 kmHarper County 42 kmSumner County 48 kmAlfalfa County 50 kmGarfield County 56 kmKay County 58 kmNoble County 74 kmKingman County 81 kmBarber 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 2.5 (ml)
Depth
4.3 km below the surface
Felt
no reports yet
Nearest
Grant County, 10 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3806 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 36.8790, -97.7957. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grant County, OK 10 km (6 mi) N of here earthquakes near Grant County
Harper County, KS 42 km (26 mi) SE of here earthquakes near Harper County
Sumner County, KS 48 km (30 mi) SW of here earthquakes near Sumner County
Alfalfa County, OK 50 km (31 mi) ENE of here earthquakes near Alfalfa County
Garfield County, OK 56 km (35 mi) N of here earthquakes near Garfield 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

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

  1. 1.6 8 km ENE of Caldwell, Kansas
  2. 1.9 8 km ENE of Caldwell, Kansas
  3. 1.9 5 km SE of Freeport, Kansas
  4. 2.0 5 km SW of Mayfield, Kansas
  5. 2.0 10 km NW of South Haven, Kansas
  6. 1.5 4 km ESE of Manchester, Oklahoma
  7. 1.7 6 km SSE of Anthony, Kansas
  8. 2.6 8 km WNW of Medford, Oklahoma
  9. 2.5 12 km WNW of Caldwell, Kansas
  10. 2.5 5 km SW of Hunnewell, Kansas
  11. 3.0 5 km E of Pond Creek, Oklahoma
  12. 1.6 4 km SSW of Bluff City, Kansas
  13. 1.8 1 km SW of Mayfield, Kansas
  14. 1.6 13 km NNW of Caldwell, Kansas
  15. 2.7 10 km NW of Medford, 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.