Earthquake · reviewed by a seismologist
M 2.4ml
Earthquake near Union City, OK
No earthquake was likely felt in Union City in the 24 hours to 1:54 pm CST (19:54 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 2.4 earthquake was recorded 14 km (9 mi) west-northwest of Union City, OK, at 1:02 pm CDT on 28 April 2021 (18:02 UTC), 7.0 km deep.
USGS: 14 km WNW of Union City, Oklahoma
52 km (32 mi) W of Oklahoma City, OK
- When
- 1:02 pm CDT on 28 April 2021 ()
- Where
- 14 km (9 mi) west-northwest of Union City, OK · earthquakes near Union City
- Oklahoma today
- every earthquake in Oklahoma in the last 24 hours
- Magnitude
- M 2.4 (ml)
- Depth
- 7.0 km below the surface
- Felt
- no reports yet
- Nearest
- Canadian County, 15 km NE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2023 days ago
Earthquake alerts for Union City, OK
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
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 40 km (25 mi) from the epicentre. In Union City, 14 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.
Likely felt in: Union City 14 km, intensity II · El Reno 16 km, intensity II · Minco 19 km, intensity II · Tuttle 30 km, intensity II · Yukon 30 km, intensity II · Mustang 33 km, intensity II · Okarche 33 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 110 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
- Magna, Utah 2020 M 5.7 95,000× the energy of this one
- Around the size people start to feel M 3.0 8.5× the energy of this one
- This earthquake M 2.4 about 110 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 35.4387, -98.0865. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Canadian County, OK | 15 km (9 mi) | NE | earthquakes near Canadian County |
| Caddo County, OK | 40 km (25 mi) | SW | earthquakes near Caddo County |
| Grady County, OK | 50 km (31 mi) | SSE | earthquakes near Grady County |
| Blaine County, OK | 58 km (36 mi) | NNW | earthquakes near Blaine County |
| Kingfisher County, OK | 58 km (36 mi) | NNE | earthquakes near Kingfisher County |
| Oklahoma County, OK | 63 km (39 mi) | ENE | earthquakes near Oklahoma County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
44 earthquakes have been recorded within 50 km since this one.
- 1.8 14 km W of Kingfisher, Oklahoma
- 1.8 13 km S of Loyal, Oklahoma
- 1.7 14 km WSW of Kingfisher, Oklahoma
- 1.9 14 km W of Kingfisher, Oklahoma
- 2.6 14 km WSW of Kingfisher, Oklahoma
- 2.0 1 km WNW of Bridge Creek, Oklahoma
- 1.7 1 km W of Bridge Creek, Oklahoma
- 2.1 Oklahoma
- 1.6 4 km SSE of El Reno, Oklahoma
- 1.5 7 km NNE of Union City, Oklahoma
- 1.6 1 km SW of Bridge Creek, Oklahoma
- 2.4 5 km SW of Union City, Oklahoma
- 1.7 6 km NW of Minco, Oklahoma
- 1.9 5 km NW of Minco, Oklahoma
- 1.8 8 km WSW 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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.