Earthquake · reviewed by a seismologist
M 2.6ml
Oklahoma
Yes. A magnitude 2.6 earthquake was recorded in Oklahoma, 37 km (23 mi) NW of Stillwater, OK, at 11:39 am CST on 21 December 2016 (17:39 UTC), 7.5 km deep.
37 km (23 mi) NW of Stillwater, OK · 105 km (65 mi) N of Oklahoma City, OK
- When
- Oklahoma today
- every earthquake in Oklahoma in the last 24 hours
- Magnitude
- M 2.6 (ml)
- Depth
- 7.5 km below the surface
- Felt
- no reports yet
- Nearest
- Noble County, 8 km E
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3528 days ago
Earthquake alerts for Perry, 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 50 km (31 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: Perry 12 km, intensity III · Stillwater 39 km, intensity II · Ponca City 41 km, intensity II · Blackwell 46 km, intensity II · Pawnee 47 km, intensity II · Enid 50 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 240 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 63,000× the energy of this one
- Magna, Utah 2020 M 5.7 45,000× the energy of this one
- Around the size people start to feel M 3.0 4× the energy of this one
- This earthquake M 2.6 about 240 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
The largest earthquake within 50 km since 2016 was M 5.8 on 2016-09-03 — about 63,000 times the energy of this one.
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 36.3947, -97.3232. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Noble County, OK | 8 km (5 mi) | E | earthquakes near Noble County |
| Garfield County, OK | 42 km (26 mi) | W | earthquakes near Garfield County |
| Payne County, OK | 47 km (29 mi) | SE | earthquakes near Payne County |
| Kay County, OK | 49 km (31 mi) | NNE | earthquakes near Kay County |
| Logan County, OK | 55 km (34 mi) | SSW | earthquakes near Logan County |
| Pawnee County, OK | 57 km (35 mi) | E | earthquakes near Pawnee County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
51 earthquakes have been recorded within 50 km since this one.
- 2.5 10 km SE of Marshall, Oklahoma
- 2.5 8 km NE of Marshall, Oklahoma
- 2.7 8 km NE of Marshall, Oklahoma
- 2.8 14 km NW of Pawnee, Oklahoma
- 1.8 4 km E of Stillwater, Oklahoma
- 3.4 12 km NW of Pawnee, Oklahoma
- 2.9 3 km NE of Morrison, Oklahoma
- 2.6 9 km W of Lamont, Oklahoma
- 2.9 5 km W of Lucien, Oklahoma
- 3.2 5 km WNW of Lucien, Oklahoma
- 2.5 10 km ENE of Orlando, Oklahoma
- 2.8 14 km NW of Pawnee, Oklahoma
- 3.0 10 km ENE of Orlando, Oklahoma
- 2.5 4 km SE of Marland, Oklahoma
- 2.6 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.