QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

Oklahoma

· 6.7 km deep · released about 680 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alfalfa County 16 kmGrant County 40 kmHarper County 40 kmBarber County 58 kmWoods County 58 kmGarfield County 65 kmMajor County 66 kmSumner County 78 kmKingman County 79 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 2.9 (ml)
Depth
6.7 km below the surface
Felt
no reports yet
Nearest
Alfalfa County, 16 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3406 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 680 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 22,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 16,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.4× the energy of this one
  4. This earthquake M 2.9 about 680 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 36.8500, -98.2269. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alfalfa County, OK 16 km (10 mi) NNE of here earthquakes near Alfalfa County
Grant County, OK 40 km (25 mi) W of here earthquakes near Grant County
Harper County, KS 40 km (25 mi) SSW of here earthquakes near Harper County
Barber County, KS 58 km (36 mi) SE of here earthquakes near Barber County
Woods County, OK 58 km (36 mi) ENE of here earthquakes near Woods County
Garfield County, OK 65 km (41 mi) NW of here earthquakes near Garfield County

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

Aftershocks so far

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

  1. 2.5 5 km WNW of Medford, Oklahoma
  2. 2.7 9 km W of Bluff City, Kansas
  3. 2.5 9 km W of Bluff City, Kansas
  4. 1.6 5 km SSE of Freeport, Kansas
  5. 2.5 2 km SW of Waldron, Kansas
  6. 2.5 1 km N of Lambert, Oklahoma
  7. 3.0 10 km SSE of Waldron, Kansas
  8. 2.8 10 km SSE of Waldron, Kansas
  9. 2.5 10 km SSE of Waldron, Kansas
  10. 2.6 4 km NE of Avard, Oklahoma
  11. 1.9 2 km WSW of Anthony, Kansas
  12. 2.4 2 km SW of Anthony, Kansas
  13. 1.7 9 km W of Bluff City, Kansas
  14. 2.0 9 km W of Bluff City, Kansas
  15. 3.3 5 km SSE of Helena, 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 4.0 on 2016-11-25 — it released about 45 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.