QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

6 km WSW of Apache, Oklahoma

· 18 km deep · released about 530 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Comanche County 23 kmCaddo County 34 kmKiowa County 51 kmGrady County 52 kmCotton County 64 kmStephens County 67 kmWashita County 70 kmTillman County 72 kmCanadian County 86 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 2.8 (ml)
Depth
18 km below the surface
Felt
53 reports · strongest reported intensity IV
Nearest
Comanche County, 23 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2157 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 53 people have reported feeling it to USGS.

How big was it?

This earthquake released about 530 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 29,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 20,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.8× the energy of this one
  4. This earthquake M 2.8 about 530 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 34.8642, -98.4278. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Comanche County, OK 23 km (14 mi) N of here earthquakes near Comanche County
Caddo County, OK 34 km (21 mi) S of here earthquakes near Caddo County
Kiowa County, OK 51 km (32 mi) E of here earthquakes near Kiowa County
Grady County, OK 52 km (32 mi) WSW of here earthquakes near Grady County
Cotton County, OK 64 km (40 mi) N of here earthquakes near Cotton County
Stephens County, OK 67 km (42 mi) NW of here earthquakes near Stephens County

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

Aftershocks so far

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

  1. 2.8 1 km ESE of Medicine Park, Oklahoma
  2. 1.7 6 km NW of Cooperton, Oklahoma
  3. 1.6 8 km NE of Cooperton, Oklahoma
  4. 1.6 4 km ENE of Medicine Park, Oklahoma
  5. 1.8 9 km NNE of Cooperton, Oklahoma
  6. 1.6 4 km E of Medicine Park, Oklahoma
  7. 1.6 4 km E of Medicine Park, Oklahoma
  8. 1.6 8 km E of Medicine Park, Oklahoma
  9. 1.6 3 km E of Medicine Park, Oklahoma
  10. 2.1 1 km SSW of Verden, Oklahoma
  11. 1.6 7 km NW of Cooperton, Oklahoma
  12. 1.7 6 km NNW of Cooperton, Oklahoma
  13. 2.2 6 km ESE of Cache, Oklahoma
  14. 1.6 4 km NNE of Cooperton, Oklahoma
  15. 1.5 4 km E of Medicine Park, 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.