QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

1 km SSE of Medford, Oklahoma

· 7.9 km deep · released about 950 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grant County 5 kmGarfield County 46 kmKay County 52 kmHarper County 53 kmAlfalfa County 53 kmSumner County 54 kmNoble County 63 kmMajor County 90 kmKingman County 92 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 3.0 (ml)
Depth
7.9 km below the surface
Felt
6 reports · strongest reported intensity III
Nearest
Grant County, 5 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3440 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 6 people have reported feeling it to USGS.

How big was it?

This earthquake released about 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 950 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 36.7918, -97.7296. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grant County, OK 5 km (3 mi) E of here earthquakes near Grant County
Garfield County, OK 46 km (29 mi) N of here earthquakes near Garfield County
Kay County, OK 52 km (32 mi) W of here earthquakes near Kay County
Harper County, KS 53 km (33 mi) SE of here earthquakes near Harper County
Alfalfa County, OK 53 km (33 mi) E of here earthquakes near Alfalfa County
Sumner County, KS 54 km (33 mi) SSW of here earthquakes near Sumner County

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

Aftershocks so far

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

  1. 2.7 8 km WNW of Deer Creek, Oklahoma
  2. 2.8 8 km SSE of Byron, Oklahoma
  3. 2.7 0 km WSW of Wakita, Oklahoma
  4. 1.7 5 km SSW of Bluff City, Kansas
  5. 1.7 5 km SSE of Freeport, Kansas
  6. 2.7 6 km WNW of Lamont, Oklahoma
  7. 2.8 3 km WNW of Deer Creek, Oklahoma
  8. 1.5 9 km W of Bluff City, Kansas
  9. 1.5 12 km W of Caldwell, Kansas
  10. 1.7 5 km SSE of Freeport, Kansas
  11. 2.6 2 km ENE of South Haven, Kansas
  12. 3.0 6 km NNW of Breckinridge, Oklahoma
  13. 2.6 8 km E of Nescatunga, Oklahoma
  14. 1.7 12 km SSE of Milan, Kansas
  15. 2.1 5 km SSE of Freeport, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.0 on 2016-11-25 — it released about 32 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.