Earthquake · reviewed by a seismologist
M 2.5ml
Earthquake near Harrah, OK
No earthquake was likely felt in Harrah in the 24 hours to 7:37 am CST (13:37 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 12 km (7 mi) northeast of Harrah, OK, at 7:05 am CDT on 27 April 2020 (12:05 UTC), 6.2 km deep. 4 people have reported feeling it to USGS.
USGS: 11 km NE of Harrah, Oklahoma
41 km (25 mi) ENE of Oklahoma City, OK · 29 km (18 mi) ENE of Midwest City, OK
- When
- 7:05 am CDT on 27 April 2020 ()
- Where
- 12 km (7 mi) northeast of Harrah, OK · earthquakes near Harrah
- Oklahoma today
- every earthquake in Oklahoma in the last 24 hours
- Magnitude
- M 2.5 (ml)
- Depth
- 6.2 km below the surface
- Felt
- 4 reports · strongest reported intensity III
- Nearest
- Lincoln County, 23 km NE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2314 days ago
Earthquake alerts for Harrah, OK
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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 44 km (27 mi) from the epicentre. In Harrah, 12 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: Luther 15 km, intensity III · Choctaw 19 km, intensity II · Chandler 23 km, intensity II · Shawnee 30 km, intensity II · Midwest City 32 km, intensity II · Prague 37 km, intensity II · Edmond 37 km, intensity II · Oklahoma City 41 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 150 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 5.8 100,000× the energy of this one
- Magna, Utah 2020 M 5.7 72,000× the energy of this one
- Around the size people start to feel M 3.0 6.5× the energy of this one
- This earthquake M 2.5 about 150 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 410 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 · 29 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 35.5668, -97.0777. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Lincoln County, OK | 23 km (14 mi) | NE | earthquakes near Lincoln County |
| Oklahoma County, OK | 30 km (19 mi) | W | earthquakes near Oklahoma County |
| Pottawatomie County, OK | 41 km (25 mi) | SSE | earthquakes near Pottawatomie County |
| Cleveland County, OK | 46 km (28 mi) | SSW | earthquakes near Cleveland County |
| Logan County, OK | 51 km (32 mi) | NW | earthquakes near Logan County |
| Payne County, OK | 58 km (36 mi) | N | earthquakes near Payne County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
52 earthquakes have been recorded within 50 km since this one.
- 1.8 5 km NNE of Edmond, Oklahoma
- 1.7 7 km ENE of McLoud, Oklahoma
- 1.5 4 km NNW of Paden, Oklahoma
- 1.5 11 km NE of Harrah, Oklahoma
- 2.3 7 km N of Spencer, Oklahoma
- 1.5 5 km N of Stroud, Oklahoma
- 2.1 5 km N of Stroud, Oklahoma
- 1.8 Oklahoma
- 1.9 5 km N of Stroud, Oklahoma
- 1.6 7 km E of Carney, Oklahoma
- 1.9 4 km W of Prague, Oklahoma
- 1.9 8 km NW of Prague, Oklahoma
- 1.7 5 km NNE of Stroud, Oklahoma
- 1.7 5 km NNE of Stroud, Oklahoma
- 1.7 5 km NNE of Stroud, 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.