Earthquake · reviewed by a seismologist
M 2.7ml
Oklahoma
Yes. A magnitude 2.7 earthquake was recorded in Oklahoma, 85 km (53 mi) ENE of Oklahoma City, OK, at 6:50 am CDT on 9 May 2017 (11:50 UTC), 5.0 km deep.
85 km (53 mi) ENE of Oklahoma City, OK · 47 km (29 mi) SE of Stillwater, OK
- When
- Oklahoma today
- every earthquake in Oklahoma in the last 24 hours
- Magnitude
- M 2.7 (ml)
- Depth
- 5.0 km below the surface
- Felt
- no reports yet
- Nearest
- Lincoln County, 23 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3389 days ago
Earthquake alerts for Stroud, 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 56 km (35 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: Stroud 11 km, intensity III · Cushing 17 km, intensity III · Chandler 23 km, intensity III · Yale 30 km, intensity II · Perkins 34 km, intensity II · Prague 40 km, intensity II · Stillwater 45 km, intensity II · Luther 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 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
- Magna, Utah 2020 M 5.7 32,000× the energy of this one
- Around the size people start to feel M 3.0 2.8× the energy of this one
- This earthquake M 2.7 about 340 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 5.0 on 2016-11-07 — about 2,800 times the energy of this one.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.7 8 km NW of Prague, Oklahoma · 35 km S of this epicentre
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 35.8434, -96.6892. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Lincoln County, OK | 23 km (14 mi) | SW | earthquakes near Lincoln County |
| Creek County, OK | 29 km (18 mi) | ENE | earthquakes near Creek County |
| Payne County, OK | 37 km (23 mi) | NW | earthquakes near Payne County |
| Pawnee County, OK | 52 km (32 mi) | N | earthquakes near Pawnee County |
| Okfuskee County, OK | 53 km (33 mi) | SE | earthquakes near Okfuskee County |
| Okmulgee County, OK | 69 km (43 mi) | ESE | earthquakes near Okmulgee 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.
- 2.7 6 km SE of Meridian, Oklahoma
- 2.9 5 km N of Stroud, Oklahoma
- 2.8 2 km WNW of Cushing, Oklahoma
- 2.6 9 km SW of Shamrock, Oklahoma
- 3.3 5 km N of Stroud, Oklahoma
- 2.3 9 km NE of Kendrick, Oklahoma
- 3.2 10 km SW of Stillwater, Oklahoma
- 3.2 10 km WSW of Shamrock, Oklahoma
- 3.2 10 km WSW of Shamrock, Oklahoma
- 3.0 10 km WSW of Shamrock, Oklahoma
- 2.6 10 km WSW of Shamrock, Oklahoma
- 3.4 10 km NE of Kendrick, Oklahoma
- 2.7 11 km WSW of Shamrock, Oklahoma
- 3.6 10 km WSW of Shamrock, Oklahoma
- 3.5 10 km WSW of Shamrock, 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.