QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

12 km WSW of Union City, Oklahoma

· 8.8 km deep · released about 400 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Canadian County 22 kmCaddo County 35 kmGrady County 42 kmOklahoma County 64 kmBlaine County 65 kmKingfisher County 67 kmMcClain County 69 kmCleveland County 71 kmWashita County 83 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
8.8 km below the surface
Felt
4 reports · strongest reported intensity IV
Nearest
Canadian County, 22 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1134 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 4 people have reported feeling it to USGS.

How big was it?

This earthquake released about 400 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 38,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 27,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.4× the energy of this one
  4. This earthquake M 2.8 about 400 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 35.3627, -98.0790. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Canadian County, OK 22 km (14 mi) SSW of here earthquakes near Canadian County
Caddo County, OK 35 km (22 mi) NE of here earthquakes near Caddo County
Grady County, OK 42 km (26 mi) NNW of here earthquakes near Grady County
Oklahoma County, OK 64 km (40 mi) WSW of here earthquakes near Oklahoma County
Blaine County, OK 65 km (41 mi) SSE of here earthquakes near Blaine County
Kingfisher County, OK 67 km (41 mi) SSW of here earthquakes near Kingfisher County

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

Aftershocks so far

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

  1. 1.7 Oklahoma
  2. 2.3 5 km N of Calumet, Oklahoma
  3. 1.7 5 km NNW of Calumet, Oklahoma
  4. 1.9 5 km N of Calumet, Oklahoma
  5. 1.6 6 km SE of Chickasha, Oklahoma
  6. 1.9 6 km N of Calumet, Oklahoma
  7. 1.7 Oklahoma
  8. 1.5 6 km NNE of Calumet, Oklahoma
  9. 1.6 6 km N of Calumet, Oklahoma
  10. 2.1 6 km N of Calumet, Oklahoma
  11. 2.4 5 km N of Calumet, Oklahoma
  12. 2.5 5 km N of Calumet, Oklahoma
  13. 1.9 5 km N of Calumet, Oklahoma
  14. 1.6 5 km N of Calumet, Oklahoma
  15. 1.9 5 km N of Calumet, 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.