Earthquake · reviewed by a seismologist
M 1.8ml
Earthquake near Harrah, OK
No earthquake was likely felt in Harrah in the 24 hours to 3:47 pm CST (21:47 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 1.8 earthquake was recorded 6 km (4 mi) north of Harrah, OK, at 10:02 pm CDT on 6 September 2020 (03:02 UTC), 17 km deep.
USGS: 5 km N of Harrah, Oklahoma
33 km (20 mi) ENE of Oklahoma City, OK · 21 km (13 mi) ENE of Midwest City, OK
- When
- 10:02 pm CDT on 6 September 2020 ()
- Where
- 6 km (4 mi) north of Harrah, OK · earthquakes near Harrah
- Oklahoma today
- every earthquake in Oklahoma in the last 24 hours
- Magnitude
- M 1.8 (ml)
- Depth
- 17 km below the surface
- Felt
- no reports yet
- Nearest
- Oklahoma County, 22 km W
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2255 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 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 8 km (5 mi) from the epicentre. In Harrah, 6 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.
Earthquakes near other towns within 30 km: Choctaw, Jones, McLoud, Luther, Nicoma Park, Spencer.
How big was it?
This earthquake released about 17 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 870,000× the energy of this one
- Magna, Utah 2020 M 5.7 620,000× the energy of this one
- Around the size people start to feel M 3.0 55× the energy of this one
- This earthquake M 1.8 about 17 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 3,500 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 · 36 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 35.5403, -97.1648. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Oklahoma County, OK | 22 km (14 mi) | W | earthquakes near Oklahoma County |
| Lincoln County, OK | 31 km (19 mi) | NE | earthquakes near Lincoln County |
| Cleveland County, OK | 40 km (25 mi) | SSW | earthquakes near Cleveland County |
| Pottawatomie County, OK | 41 km (26 mi) | SSE | earthquakes near Pottawatomie County |
| Logan County, OK | 49 km (30 mi) | NNW | earthquakes near Logan County |
| Payne County, OK | 62 km (39 mi) | NNE | earthquakes near Payne County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
47 earthquakes have been recorded within 50 km since this one.
- 1.5 3 km SE of Carney, Oklahoma
- 3.7 3 km SE of Carney, Oklahoma
- 1.6 9 km WNW of Prague, Oklahoma
- 1.6 7 km W of Meeker, Oklahoma
- 1.6 6 km ENE of Edmond, Oklahoma
- 2.1 7 km SE of Agra, Oklahoma
- 1.7 4 km WNW of Langston, Oklahoma
- 1.8 9 km W of Meeker, Oklahoma
- 1.6 6 km ESE of Luther, Oklahoma
- 1.6 6 km W of Arcadia, Oklahoma
- 1.5 7 km SE of Luther, Oklahoma
- 1.9 7 km E of Carney, Oklahoma
- 2.1 7 km SE of Luther, Oklahoma
- 1.5 5 km W of Arcadia, Oklahoma
- 1.7 6 km W 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.