QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

Earthquake near Union City, OK

No earthquake was likely felt in Union City in the 24 hours to 4:16 pm CST (22:16 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 1.7 earthquake was recorded in Union City, OK, at 6:58 am CDT on 7 April 2021 (11:58 UTC), 6.8 km deep.

USGS: 1 km SSE of Union City, Oklahoma

39 km (24 mi) WSW of Oklahoma City, OK

6:58 am CDT, Apr 7, 2021 · · 6.8 km deep · released about 11 lb of TNT

Every earthquake near Union City Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Canadian County 19 kmGrady County 40 kmCaddo County 47 kmOklahoma County 51 kmCleveland County 58 kmMcClain County 59 kmKingfisher County 64 kmBlaine County 72 kmLogan County 74 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
6:58 am CDT on 7 April 2021 ()
Where
in Union City, OK · earthquakes near Union City
Oklahoma today
every earthquake in Oklahoma in the last 24 hours
Magnitude
M 1.7 (ml)
Depth
6.8 km below the surface
Felt
no reports yet
Nearest
Canadian County, 19 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2043 days ago

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

At this magnitude and depth, people at rest would likely notice it out to about 10 km (6 mi) from the epicentre. 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.

Likely felt in: Union City in town, intensity II · Minco 7 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 89× the energy of this one
  4. This earthquake M 1.7 about 11 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 35.3782, -97.9310. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Canadian County, OK 19 km (12 mi) NNW earthquakes near Canadian County
Grady County, OK 40 km (25 mi) S earthquakes near Grady County
Caddo County, OK 47 km (29 mi) WSW earthquakes near Caddo County
Oklahoma County, OK 51 km (32 mi) ENE earthquakes near Oklahoma County
Cleveland County, OK 58 km (36 mi) ESE earthquakes near Cleveland County
McClain County, OK 59 km (37 mi) SE earthquakes near McClain County

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

Aftershocks so far

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

  1. 1.7 2 km S of Tuttle, Oklahoma
  2. 1.6 7 km SW of Yukon, Oklahoma
  3. 1.5 8 km SW of Yukon, Oklahoma
  4. 1.6 8 km SW of Yukon, Oklahoma
  5. 1.6 8 km SW of Yukon, Oklahoma
  6. 1.8 11 km WSW of El Reno, Oklahoma
  7. 1.6 11 km WSW of El Reno, Oklahoma
  8. 1.8 13 km WSW of El Reno, Oklahoma
  9. 1.6 5 km W of Yukon, Oklahoma
  10. 1.9 3 km S of Blanchard, Oklahoma
  11. 1.6 4 km ESE of El Reno, Oklahoma
  12. 2.7 6 km NNE of Alex, Oklahoma
  13. 1.5 5 km ESE of Union City, Oklahoma
  14. 1.6 8 km SW of Dibble, Oklahoma
  15. 2.1 1 km SSW of Verden, 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.