Earthquake · reviewed by a seismologist
M 2.5ml
Earthquake near Ardmore, OK
No earthquake was likely felt in Ardmore in the 24 hours to 5:47 pm CST (23:47 UTC). The last one was M 3.4, 180 km (112 mi) NNW, at 5:53 am CST on 7 November 2026, estimated intensity II (weak) in town; 23 felt reports to USGS. Every earthquake near Ardmore
This page: a magnitude 2.5 earthquake was recorded 29 km (18 mi) south-southwest of Ardmore, OK, at 2:43 am CST on 20 December 2021 (08:43 UTC), 12 km deep. 4 people have reported feeling it to USGS.
USGS: 14 km ENE of Leon, Oklahoma
- When
- 2:43 am CST on 20 December 2021 ()
- Where
- 29 km (18 mi) south-southwest of Ardmore, OK · earthquakes near Ardmore
- Oklahoma today
- every earthquake in Oklahoma in the last 24 hours
- Magnitude
- M 2.5 (ml)
- Depth
- 12 km below the surface
- Felt
- 4 reports · strongest reported intensity III
- Nearest
- Love County, 5 km E
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1716 days ago
Earthquake alerts for Ardmore, 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 small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 46 km (29 mi) from the epicentre. In Ardmore, 29 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: Ardmore 29 km, intensity II · Healdton 36 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 190 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 80,000× the energy of this one
- Magna, Utah 2020 M 5.7 57,000× the energy of this one
- Around the size people start to feel M 3.0 5.1× the energy of this one
- This earthquake M 2.5 about 190 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 33.9515, -97.2990. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Love County, OK | 5 km (3 mi) | E | earthquakes near Love County |
| Carter County, OK | 33 km (21 mi) | N | earthquakes near Carter County |
| Cooke County, TX | 36 km (22 mi) | SSE | earthquakes near Cooke County |
| Marshall County, OK | 49 km (31 mi) | E | earthquakes near Marshall County |
| Montague County, TX | 50 km (31 mi) | SW | earthquakes near Montague County |
| Jefferson County, OK | 53 km (33 mi) | WNW | earthquakes near Jefferson County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
12 earthquakes have been recorded within 50 km since this one.
- 1.8 13 km W of Marietta, Oklahoma
- 1.5 12 km W of Marietta, Oklahoma
- 2.2 15 km W of Marietta, Oklahoma
- 1.8 15 km ENE of Leon, Oklahoma
- 2.0 14 km ENE of Leon, Oklahoma
- 1.5 14 km ENE of Leon, Oklahoma
- 2.5 9 km WSW of Lebanon, Oklahoma
- 2.2 14 km W of Marietta, Oklahoma
- 1.8 14 km ENE of Leon, Oklahoma
- 1.6 7 km ESE of Wilson, Oklahoma
- 1.6 14 km ENE of Leon, Oklahoma
- 2.3 13 km NE of Leon, 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.