Earthquake · reviewed by a seismologist
M 2.5ml
Earthquake near Harrah, OK
No earthquake was likely felt in Harrah in the 24 hours to 4:55 pm CST (22:55 UTC). The last one was M 3.4, 81 km (50 mi) W, at 5:53 am CST on 7 November 2026, estimated intensity II (weak) in town; 23 felt reports to USGS. Every earthquake near Harrah
This page: a magnitude 2.5 earthquake was recorded 4 km (3 mi) north of Harrah, OK, at 5:58 pm CDT on 20 May 2018 (22:58 UTC), 5.4 km deep. 1 person has reported feeling it to USGS.
USGS: 4 km N of Harrah, Oklahoma
33 km (21 mi) ENE of Oklahoma City, OK · 21 km (13 mi) ENE of Midwest City, OK
- When
- 5:58 pm CDT on 20 May 2018 ()
- Where
- 4 km (3 mi) north of Harrah, OK · earthquakes near Harrah
- Oklahoma today
- every earthquake in Oklahoma in the last 24 hours
- Magnitude
- M 2.5 (ml)
- Depth
- 5.4 km below the surface
- Felt
- 1 report · strongest reported intensity II
- Nearest
- Oklahoma County, 23 km W
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3010 days ago
Earthquake alerts for Harrah, OK
Get a notification in this browser when USGS records an earthquake near Harrah, OK. No account or email needed.
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 Harrah, 4 km away, the estimate is intensity III (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: Choctaw 11 km, intensity III · Luther 15 km, intensity III · Midwest City 23 km, intensity II · Shawnee 30 km, intensity II · Chandler 32 km, intensity II · Edmond 32 km, intensity II · Oklahoma City 33 km, intensity II · Moore 37 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 170 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 89,000× the energy of this one
- Magna, Utah 2020 M 5.7 63,000× the energy of this one
- Around the size people start to feel M 3.0 5.6× the energy of this one
- This earthquake M 2.5 about 170 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 4.2 on 2016-04-07 — about 350 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 E 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 35.5263, -97.1549. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Oklahoma County, OK | 23 km (14 mi) | W | earthquakes near Oklahoma County |
| Lincoln County, OK | 32 km (20 mi) | NE | earthquakes near Lincoln County |
| Cleveland County, OK | 39 km (24 mi) | SSW | earthquakes near Cleveland County |
| Pottawatomie County, OK | 39 km (24 mi) | SSE | earthquakes near Pottawatomie County |
| Logan County, OK | 51 km (32 mi) | NNW | earthquakes near Logan County |
| McClain County, OK | 63 km (39 mi) | SSW | earthquakes near McClain County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
48 earthquakes have been recorded within 50 km since this one.
- 2.7 6 km W of Arcadia, Oklahoma
- 2.9 4 km W of Arcadia, Oklahoma
- 2.6 7 km N of Spencer, Oklahoma
- 2.6 4 km ESE of Carney, Oklahoma
- 3.0 0 km NNE of Coyle, Oklahoma
- 2.6 8 km W of Meridian, Oklahoma
- 3.6 2 km SW of Wellston, Oklahoma
- 2.5 0 km NW of Coyle, Oklahoma
- 2.6 0 km N of Coyle, Oklahoma
- 2.9 0 km NW of Coyle, Oklahoma
- 2.3 5 km W of Arcadia, Oklahoma
- 2.6 5 km W of Arcadia, Oklahoma
- 2.6 0 km NNW of Coyle, Oklahoma
- 3.3 0 km N of Coyle, Oklahoma
- 2.5 3 km NE of Arcadia, 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.