QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6ml

5 km W of Medford, Oklahoma

· 6.9 km deep · released about 240 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grant County 2 kmGarfield County 48 kmAlfalfa County 48 kmHarper County 49 kmSumner County 55 kmKay County 58 kmNoble County 68 kmMajor County 87 kmKingman County 89 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 2.6 (ml)
Depth
6.9 km below the surface
Felt
no reports yet
Nearest
Grant County, 2 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2817 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 240 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 63,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 45,000× the energy of this one
  3. Around the size people start to feel M 3.0 4× the energy of this one
  4. This earthquake M 2.6 about 240 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 36.8073, -97.7918. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grant County, OK 2 km (1 mi) N of here earthquakes near Grant County
Garfield County, OK 48 km (30 mi) N of here earthquakes near Garfield County
Alfalfa County, OK 48 km (30 mi) E of here earthquakes near Alfalfa County
Harper County, KS 49 km (30 mi) SSE of here earthquakes near Harper 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. 2.0 2 km NW of Jet, Oklahoma
  2. 2.5 Kansas
  3. 1.5 3 km E of Freeport, Kansas
  4. 2.0 6 km N of Medford, Oklahoma
  5. 2.4 2 km NE of Medford, Oklahoma
  6. 2.0 4 km NE of Cherokee, Oklahoma
  7. 1.6 6 km SSE of Anthony, Kansas
  8. 2.3 5 km ENE of South Haven, Kansas
  9. 2.5 3 km ENE of South Haven, Kansas
  10. 3.1 8 km W of Bluff City, Kansas
  11. 1.7 5 km NW of Caldwell, Kansas
  12. 2.4 4 km NE of South Haven, Kansas
  13. 2.4 5 km NE of South Haven, Kansas
  14. 4.0 4 km ENE of South Haven, Kansas
  15. 2.5 6 km N of Wakita, 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 4.4 on 2018-06-09 — it released about 500 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.