QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

5 km ENE of Union City, Oklahoma

· 3.4 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Canadian County 16 kmGrady County 44 kmOklahoma County 46 kmCaddo County 53 kmCleveland County 56 kmKingfisher County 59 kmMcClain County 60 kmLogan County 68 kmBlaine County 71 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 1.8 (ml)
Depth
3.4 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Canadian County, 16 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1412 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× the energy of this one
  4. This earthquake M 1.8 about 15 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 35.4172, -97.8882. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Canadian County, OK 16 km (10 mi) SSE of here earthquakes near Canadian County
Grady County, OK 44 km (27 mi) N of here earthquakes near Grady County
Oklahoma County, OK 46 km (29 mi) WSW of here earthquakes near Oklahoma County
Caddo County, OK 53 km (33 mi) ENE of here earthquakes near Caddo County
Cleveland County, OK 56 km (35 mi) WNW of here earthquakes near Cleveland County
Kingfisher County, OK 59 km (37 mi) S of here earthquakes near Kingfisher County

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

Aftershocks so far

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

  1. 1.6 3 km SW of Dibble, Oklahoma
  2. 2.0 3 km NNE of Okarche, Oklahoma
  3. 2.2 Oklahoma
  4. 1.6 2 km NNE of Okarche, Oklahoma
  5. 1.7 6 km WSW of Minco, Oklahoma
  6. 1.5 4 km NE of Okarche, Oklahoma
  7. 2.0 13 km E of Hinton, Oklahoma
  8. 2.9 7 km WSW of Minco, Oklahoma
  9. 2.1 5 km NNE of Ninnekah, Oklahoma
  10. 1.6 6 km WSW of Minco, Oklahoma
  11. 2.1 11 km WSW of Minco, Oklahoma
  12. 1.7 9 km NW of Pocasset, Oklahoma
  13. 2.6 8 km WSW of Minco, Oklahoma
  14. 1.9 9 km NW of Pocasset, Oklahoma
  15. 2.1 9 km NW of Pocasset, 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.