Earthquake · reviewed by a seismologist
M 2.4mb_lg
Earthquake near Stillwater, OK
No earthquake was likely felt in Stillwater in the 24 hours to 5:33 pm CST (23:33 UTC). The last one was M 3.4, 105 km (65 mi) WSW, at 5:53 am CST on 7 November 2026, estimated intensity II (weak) in town; 23 felt reports to USGS. Every earthquake near Stillwater
This page: a magnitude 2.4 earthquake was recorded 36 km (22 mi) north of Stillwater, OK, at 12:45 pm CDT on 21 July 2017 (17:45 UTC), 5.8 km deep.
USGS: 10 km ESE of Red Rock, Oklahoma
34 km (21 mi) N of Stillwater, OK · 115 km (72 mi) NNE of Oklahoma City, OK
- When
- 12:45 pm CDT on 21 July 2017 ()
- Where
- 36 km (22 mi) north of Stillwater, OK · earthquakes near Stillwater
- Oklahoma today
- every earthquake in Oklahoma in the last 24 hours
- Magnitude
- M 2.4 (mb_lg)
- Depth
- 5.8 km below the surface
- Felt
- no reports yet
- Nearest
- Noble County, 16 km WSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3319 days ago
Earthquake alerts for Stillwater, 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 41 km (25 mi) from the epicentre. In Stillwater, 36 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: Perry 26 km, intensity II · Pawnee 26 km, intensity II · Ponca City 30 km, intensity II · Stillwater 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 120 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 89,000× the energy of this one
- Around the size people start to feel M 3.0 7.9× the energy of this one
- This earthquake M 2.4 about 120 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 130,000 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 36.4386, -97.0655. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Noble County, OK | 16 km (10 mi) | WSW | earthquakes near Noble County |
| Pawnee County, OK | 36 km (22 mi) | ESE | earthquakes near Pawnee County |
| Payne County, OK | 41 km (25 mi) | SSE | earthquakes near Payne County |
| Kay County, OK | 42 km (26 mi) | N | earthquakes near Kay County |
| Osage County, OK | 62 km (39 mi) | ENE | earthquakes near Osage County |
| Garfield County, OK | 65 km (40 mi) | W | earthquakes near Garfield County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
45 earthquakes have been recorded within 50 km since this one.
- 3.5 4 km W of Lucien, Oklahoma
- 3.0 4 km ENE of Morrison, Oklahoma
- 3.0 9 km W of Orlando, Oklahoma
- 2.6 9 km SSE of Covington, Oklahoma
- 2.3 8 km SSE of Perry, Oklahoma
- 2.9 5 km WNW of Lucien, Oklahoma
- 3.1 4 km W of Lucien, Oklahoma
- 2.5 8 km SSE of Perry, Oklahoma
- 2.4 8 km SSE of Perry, Oklahoma
- 2.7 5 km WNW of Lucien, Oklahoma
- 2.5 7 km SE of Lucien, Oklahoma
- 2.7 5 km WNW of Lucien, Oklahoma
- 2.7 3 km W of Lucien, Oklahoma
- 2.6 4 km WNW of Lucien, Oklahoma
- 2.6 4 km WNW of Lucien, 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.