QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

5 km NNE of Medford, Oklahoma

· 7.2 km deep · released about 51 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grant County 10 kmSumner County 47 kmHarper County 50 kmKay County 50 kmGarfield County 53 kmAlfalfa County 57 kmNoble County 66 kmKingman County 88 kmCowley 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 2.1 (ml)
Depth
7.2 km below the surface
Felt
no reports yet
Nearest
Grant County, 10 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2669 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 51 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 210,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 51 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 36.8478, -97.7047. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grant County, OK 10 km (6 mi) NE of here earthquakes near Grant County
Sumner County, KS 47 km (29 mi) SSW of here earthquakes near Sumner County
Harper County, KS 50 km (31 mi) SE of here earthquakes near Harper County
Kay County, OK 50 km (31 mi) W of here earthquakes near Kay County
Garfield County, OK 53 km (33 mi) N of here earthquakes near Garfield County
Alfalfa County, OK 57 km (35 mi) ENE of here earthquakes near Alfalfa 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. 2.3 7 km ENE of Nescatunga, Oklahoma
  2. 2.2 7 km ENE of Nescatunga, Oklahoma
  3. 1.9 9 km ESE of Jefferson, Oklahoma
  4. 2.0 2 km ENE of Medford, Oklahoma
  5. 2.2 5 km SW of Braman, Oklahoma
  6. 1.9 1 km NNE of Manchester, Oklahoma
  7. 3.1 8 km ESE of Jefferson, Oklahoma
  8. 1.6 8 km ENE of Manchester, Oklahoma
  9. 1.5 8 km ENE of Manchester, Oklahoma
  10. 2.4 8 km N of Nardin, Oklahoma
  11. 2.1 7 km N of Nardin, Oklahoma
  12. 3.3 9 km W of Lamont, Oklahoma
  13. 2.5 9 km ESE of Jefferson, Oklahoma
  14. 2.3 10 km E of Jefferson, Oklahoma
  15. 4.4 8 km E of Pond Creek, 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 2,400 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.