QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

Earthquake near Union City, OK

No earthquake was likely felt in Union City in the 24 hours to 5:53 pm CST (23:53 UTC). The last one was M 3.4, 26 km (16 mi) NNW, at 5:53 am CST on 7 November 2026, estimated intensity III (weak) in town; 23 felt reports to USGS. Every earthquake near Union City

This page: a magnitude 1.5 earthquake was recorded 7 km (5 mi) north-northeast of Union City, OK, at 7:46 pm CST on 4 December 2021 (01:46 UTC), 5.3 km deep.

USGS: 7 km NNE of Union City, Oklahoma

35 km (22 mi) W of Oklahoma City, OK

7:46 pm CST, Dec 4, 2021 · · 5.3 km deep · released about 6.2 lb of TNT

Every earthquake near Union City Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Canadian County 13 kmOklahoma County 46 kmGrady County 48 kmCaddo County 54 kmKingfisher County 56 kmCleveland County 59 kmMcClain County 63 kmLogan County 66 kmBlaine County 67 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
7:46 pm CST on 4 December 2021 ()
Where
7 km (5 mi) north-northeast of Union City, OK · earthquakes near Union City
Oklahoma today
every earthquake in Oklahoma in the last 24 hours
Magnitude
M 1.5 (ml)
Depth
5.3 km below the surface
Felt
no reports yet
Nearest
Canadian County, 13 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1801 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. In Union City, 7 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Earthquakes near other towns within 30 km: El Reno, Yukon, Minco, Mustang, Tuttle, Bethany.

How big was it?

This earthquake released about 6.2 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
  3. Around the size people start to feel M 3.0 150× the energy of this one
  4. This earthquake M 1.5 about 6.2 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.

For this area

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 35.4500, -97.9010. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Canadian County, OK 13 km (8 mi) NW earthquakes near Canadian County
Oklahoma County, OK 46 km (29 mi) ENE earthquakes near Oklahoma County
Grady County, OK 48 km (30 mi) S earthquakes near Grady County
Caddo County, OK 54 km (33 mi) SW earthquakes near Caddo County
Kingfisher County, OK 56 km (35 mi) N earthquakes near Kingfisher County
Cleveland County, OK 59 km (37 mi) ESE earthquakes near Cleveland County

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

Aftershocks so far

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

  1. 2.0 9 km N of Piedmont, Oklahoma
  2. 1.5 9 km N of Piedmont, Oklahoma
  3. 2.3 9 km N of Piedmont, Oklahoma
  4. 1.5 4 km E of Union City, Oklahoma
  5. 1.6 5 km E of Union City, Oklahoma
  6. 1.6 8 km N of El Reno, Oklahoma
  7. 2.0 6 km ENE of Union City, Oklahoma
  8. 1.6 10 km N of El Reno, Oklahoma
  9. 2.1 6 km ENE of Union City, Oklahoma
  10. 1.7 4 km E of Union City, Oklahoma
  11. 1.8 9 km N of El Reno, Oklahoma
  12. 1.7 9 km N of El Reno, Oklahoma
  13. 2.1 5 km ENE of Union City, Oklahoma
  14. 1.7 10 km SSE of Okarche, Oklahoma
  15. 1.8 10 km N of El Reno, 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.